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Javascript | Algorithms implemented in JavaScript for beginners | Learning library

 by   TheAlgorithms JavaScript Version: Current License: GPL-3.0

 by   TheAlgorithms JavaScript Version: Current License: GPL-3.0

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kandi X-RAY | Javascript Summary

Javascript is a JavaScript library typically used in Tutorial, Learning, Example Codes applications. Javascript has no bugs, it has no vulnerabilities, it has a Strong Copyleft License and it has medium support. You can download it from GitHub.
Algorithms implemented in Javascript for beginners, following best practices.
Support
Support
Quality
Quality
Security
Security
License
License
Reuse
Reuse

kandi-support Support

  • Javascript has a medium active ecosystem.
  • It has 19017 star(s) with 3308 fork(s). There are 561 watchers for this library.
  • It had no major release in the last 12 months.
  • There are 5 open issues and 135 have been closed. On average issues are closed in 37 days. There are 4 open pull requests and 0 closed requests.
  • It has a neutral sentiment in the developer community.
  • The latest version of Javascript is current.
Javascript Support
Best in #Learning
Average in #Learning
Javascript Support
Best in #Learning
Average in #Learning

quality kandi Quality

  • Javascript has 0 bugs and 0 code smells.
Javascript Quality
Best in #Learning
Average in #Learning
Javascript Quality
Best in #Learning
Average in #Learning

securitySecurity

  • Javascript has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
  • Javascript code analysis shows 0 unresolved vulnerabilities.
  • There are 0 security hotspots that need review.
Javascript Security
Best in #Learning
Average in #Learning
Javascript Security
Best in #Learning
Average in #Learning

license License

  • Javascript is licensed under the GPL-3.0 License. This license is Strong Copyleft.
  • Strong Copyleft licenses enforce sharing, and you can use them when creating open source projects.
Javascript License
Best in #Learning
Average in #Learning
Javascript License
Best in #Learning
Average in #Learning

buildReuse

  • Javascript releases are not available. You will need to build from source code and install.
Javascript Reuse
Best in #Learning
Average in #Learning
Javascript Reuse
Best in #Learning
Average in #Learning
Top functions reviewed by kandi - BETA

kandi has reviewed Javascript and discovered the below as its top functions. This is intended to give you an instant insight into Javascript implemented functionality, and help decide if they suit your requirements.

  • search for mid level

    Get all kandi verified functions for this library.

    Get all kandi verified functions for this library.

    Javascript Key Features

    Algorithms implemented in JavaScript for beginners, following best practices.

    Javascript dynamically inserted later on: how to make it run?

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    const addScript = () => {
        const script = document.createElement("script");
        script.src = '<url-of-the-script>';
        script.async = true;
        script.onload = function() {
            // Do something
        };
        document.head.appendChild(script);
    }
    
    useEffect(() => {
        addScript();
        return () => {
            // remove the script on component unmount
        };
    }, []);
    
    const addScript = () => {
        const script = document.createElement("script");
        script.src = '<url-of-the-script>';
        script.async = true;
        script.onload = function() {
            // Do something
        };
        document.head.appendChild(script);
    }
    
    useEffect(() => {
        addScript();
        return () => {
            // remove the script on component unmount
        };
    }, []);
    
    const [dbData,setDbData] = useState([]);
    
    useEffect(()=>{
      const dbReqFunc = async () => {
        // req your dynamic data here and set the data fetched to dbData
        // using setDbData(...)
      };
    
      dbReqFunc();
    },[]);  // Making the call on component loading (Modify accordingly based on 
            // needs)
    
    
    useEffect(()=>{
      if(dbData.length>0){
        const elem = document.createElement('div');
        dbData.map(data=> {
    
            // based on data returned modify accordingly
    
            const script = document.createElement("script");
            script.src = '...script-url...';
            script.async = true;
            script.onload = function() {
              // Do something
            };
         
            //...other script fields...       
    
            elem.appendChild(script);
          });
         
         // attach elem to body
         document.body.appendChild(elem);
    
         return ()=>{
          // clean-up function
            document.body.removeChild(elem);
         };
      }
    
    },[dbData]);
    
    const [dbData,setDbData] = useState([]);
    
    useEffect(()=>{
      const dbReqFunc = async () => {
        // req your dynamic data here and set the data fetched to dbData
        // using setDbData(...)
      };
    
      dbReqFunc();
    },[]);  // Making the call on component loading (Modify accordingly based on 
            // needs)
    
    
    useEffect(()=>{
      if(dbData.length>0){
        const elem = document.createElement('div');
        dbData.map(data=> {
    
            // based on data returned modify accordingly
    
            const script = document.createElement("script");
            script.src = '...script-url...';
            script.async = true;
            script.onload = function() {
              // Do something
            };
         
            //...other script fields...       
    
            elem.appendChild(script);
          });
         
         // attach elem to body
         document.body.appendChild(elem);
    
         return ()=>{
          // clean-up function
            document.body.removeChild(elem);
         };
      }
    
    },[dbData]);
    
    function App() {
      const ref = useRef();
    
      useEffect(() => {
        /* convert your HTML string into DocumentFragment*/
        const node = document.createRange().createContextualFragment(HTML);
        ref.current.appendChild(node);
      }, []);
    
      return (
        <div>
          <h1>HTML String</h1>
          <div>
            <div ref={ref}></div>
          </div>
        </div>
      );
    }
    
    
    class App extends React.Component {
      constructor(props) {
        super(props);
        this.ref = React.createRef();
      }
    
      componentDidMount() {
        const node = document.createRange().createContextualFragment(HTML);
        this.ref.current.appendChild(node);
      }
    
      render() {
        return (
          <div>
            <h1>HTML String</h1>
            <div>
              <div ref={this.ref}></div>
            </div>
          </div>
        );
      }
    }
    
    
    function App() {
      const ref = useRef();
    
      useEffect(() => {
        /* convert your HTML string into DocumentFragment*/
        const node = document.createRange().createContextualFragment(HTML);
        ref.current.appendChild(node);
      }, []);
    
      return (
        <div>
          <h1>HTML String</h1>
          <div>
            <div ref={ref}></div>
          </div>
        </div>
      );
    }
    
    
    class App extends React.Component {
      constructor(props) {
        super(props);
        this.ref = React.createRef();
      }
    
      componentDidMount() {
        const node = document.createRange().createContextualFragment(HTML);
        this.ref.current.appendChild(node);
      }
    
      render() {
        return (
          <div>
            <h1>HTML String</h1>
            <div>
              <div ref={this.ref}></div>
            </div>
          </div>
        );
      }
    }
    
    

    Instead change the require of index.js, to a dynamic import() which is available in all CommonJS modules

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    "type": "module",
    
    ng update @angular-devkit/build-angular 
    

    What is jsconfig.json

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    {
      "compilerOptions": {
        "baseUrl": ".",
        "paths": {
          "$libs": ["src/libs"],
          "$libs/*": ["src/libs/*"],
        }
      },
      "include": ["src/**/*.d.ts", "src/**/*.js", "src/**/*.svelte"],
      "exclude": ["node_modules", "**/node_modules", "dist"]
    }
    

    Selenium-chromedriver: Cannot construct KeyEvent from non-typeable key

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    driver.find_element('.email-input', 'user@mail.com')
    
    from selenium.webdriver.common.keys import Keys
    from selenium.webdriver.common.action_chains import ActionChains
    
    emailParts = 'user@mail.com'.split('@')
    emailElement = driver.find_element('.email-input')
    
    emailElement.send_keys(emailParts[0])
    action = ActionChains(driver)
    action.key_down(Keys.ALT).send_keys('2').key_up(Keys.ALT).perform()
    emailElement.send_keys(emailParts[1])
    
    driver.find_element('.email-input', 'user@mail.com')
    
    from selenium.webdriver.common.keys import Keys
    from selenium.webdriver.common.action_chains import ActionChains
    
    emailParts = 'user@mail.com'.split('@')
    emailElement = driver.find_element('.email-input')
    
    emailElement.send_keys(emailParts[0])
    action = ActionChains(driver)
    action.key_down(Keys.ALT).send_keys('2').key_up(Keys.ALT).perform()
    emailElement.send_keys(emailParts[1])
    
    # /test/support/system/capybara_config.rb
    require 'webdrivers/chromedriver'
    Webdrivers::Chromedriver.required_version = '97.0.4692.71'
    
    
    class ApplicationSystemTestCase < ActionDispatch::SystemTestCase
    
      # overriding the `fill_in` helper for filling in strings with an `@` symbol
      def fill_in(locator = nil, with:, currently_with: nil, fill_options: {}, **find_options)
        return super unless with.include? "@"
    
        find_options[:with] = currently_with if currently_with
        find_options[:allow_self] = true if locator.nil?
        element = find(:fillable_field, locator, **find_options)
        email_front, email_back = with.split("@")
    
        element.send_keys(email_front)
        page.driver.browser.action
            .key_down(Selenium::WebDriver::Keys[:alt])
            .send_keys('g')
            .key_up(Selenium::WebDriver::Keys[:alt])
            .perform
        element.send_keys(email_back)
      end
    end
    
    # /test/support/system/capybara_config.rb
    require 'webdrivers/chromedriver'
    Webdrivers::Chromedriver.required_version = '97.0.4692.71'
    
    
    class ApplicationSystemTestCase < ActionDispatch::SystemTestCase
    
      # overriding the `fill_in` helper for filling in strings with an `@` symbol
      def fill_in(locator = nil, with:, currently_with: nil, fill_options: {}, **find_options)
        return super unless with.include? "@"
    
        find_options[:with] = currently_with if currently_with
        find_options[:allow_self] = true if locator.nil?
        element = find(:fillable_field, locator, **find_options)
        email_front, email_back = with.split("@")
    
        element.send_keys(email_front)
        page.driver.browser.action
            .key_down(Selenium::WebDriver::Keys[:alt])
            .send_keys('g')
            .key_up(Selenium::WebDriver::Keys[:alt])
            .perform
        element.send_keys(email_back)
      end
    end
    
     String arroba = Keys.chord(Keys.ALT, "2");
    
     String[] mailSplit = mail.split("@");
    
     userInput.sendKeys(mailSplit[0]);
    
     userInput.sendKeys(arroba);
     userInput.sendKeys(Keys.BACK_SPACE);
    
     userInput.sendKeys(mailSplit[1]);
    
    from selenium.webdriver.common.action_chains import ActionChains
    from selenium.webdriver.common.by import By
    
    def safe_send_keys(
        driver,
        input_selector: str,
        input_text: str,
        selector_type = By.CSS_SELECTOR
    ):
        driver.find_element(selector_type, input_selector).click()
        action = ActionChains(driver)
        action.send_keys(input_text)
        action.perform()
    
    # Example
    driver = webdriver.Chrome()
    # ... Go to your web page
    email = "email_with_at@email.com"
    selector = "input_selector"
    safe_send_keys(driver, selector, email)
    
     JavascriptExecutor jse = (JavascriptExecutor) getDriver();
     jse.executeScript("arguments[0].setAttribute('value', arguments[1])", googleEmailWebElement, email);
    
    WebDriverManager.chromedriver().browserVersion("97").setup();
    
    fill_in :user_email, with: user.email
    
    def fill_in_chrome98_tmp_fix(locator, with:)
      element = find(:fillable_field, locator)
      dom_id = element.native.dom_attribute("id")
      raise "No DOM ID" if dom_id.blank?
      page.execute_script("document.getElementById('#{dom_id}').value = '#{with}'")
    end
    
    fill_in :user_email, with: user.email
    
    def fill_in_chrome98_tmp_fix(locator, with:)
      element = find(:fillable_field, locator)
      dom_id = element.native.dom_attribute("id")
      raise "No DOM ID" if dom_id.blank?
      page.execute_script("document.getElementById('#{dom_id}').value = '#{with}'")
    end
    
    @classmethod
    def setUpClass(cls):
        super().setUpClass()
    
        options = webdriver.ChromeOptions()
        options.add_argument('--no-sandbox')  # Must be the very first option
        options.add_argument('--headless')
        options.add_argument('--disable-gpu')
        options.add_argument('--disable-software-rasterizer')
    
        options.add_argument('--disable-dev-shm-usage')
        options.add_argument("--remote-debugging-port=9222")
        options.add_argument("--no-default-browser-check")
        options.add_argument("--no-first-run")
        options.add_argument("--disable-default-apps")
    
        s = Service(
            ChromeDriverManager(
                # version='98.0.4758.80',
                # version='98.0.4758.48',
                version='97.0.4692.71',
                log_level=logging.WARNING,
                chrome_type=ChromeType.CHROMIUM).install())
    
        cls.selenium = webdriver.Chrome(
            service=s,
            options=options)
        cls.selenium.implicitly_wait(1)
    

    Flutter iOS Error Class AMSupportURLConnectionDelegate is implemented in both /usr/lib/libamsupport.dylib (0x203913130)

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        Simulator deployment target 'IPHONEOS_DEPLOYMENT_TARGET' is set to 8.0, but the range of supported
        deployment target versions is 9.0 to 15.2.99. (in target 'AppAuth' from project 'Pods')
        /Users/zack/Desktop/halseon/Merchant/halseon_merchants/ios/Pods/Pods.xcodeproj: warning: The iOS
        Simulator deployment target 'IPHONEOS_DEPLOYMENT_TARGET' is set to 8.0, but the range of supported
        deployment target versions is 9.0 to 15.2.99. (in target 'GoogleSignIn' from project 'Pods')
    
    $ rm ios/Flutter/Flutter.podspec
    $ flutter clean
    
    flutter clean
    rm -Rf ios/Pods
    rm -Rf ios/.symlinks
    rm -Rf ios/Flutter/Flutter.framework
    rm -Rf ios/Flutter/Flutter.podspec
    rm ios/Podfile
    
    cd ios
    flutter pub get
    pod cache clean --all
    pod install
    
        or  (below for m1 chip incase above command thrown error in pod install)
    
    #1 Install ffi
    sudo arch -x86_64 gem install ffi
    
    #2 Re-install dependencies
    arch -x86_64 pod install
    
    1. Open ios/Pods/Pods.xcodeproj in Xcode
    2. Change the iOS Deployment info from 8.0 to 9.0
    
    From xcode clean / build again / run. Hope this should work. Before please confirm whether all the build settings for iOS configured properly or not.
    
    Check platform :ios, '10.0' is uncommented
    
    target 'CustomImageNotifications' do
      use_frameworks!
      pod 'Firebase/Analytics'
      pod 'Firebase/Messaging'
    end 
    
    flutter clean
    rm -Rf ios/Pods
    rm -Rf ios/.symlinks
    rm -Rf ios/Flutter/Flutter.framework
    rm -Rf ios/Flutter/Flutter.podspec
    rm ios/Podfile
    
    cd ios
    flutter pub get
    pod cache clean --all
    pod install
    
        or  (below for m1 chip incase above command thrown error in pod install)
    
    #1 Install ffi
    sudo arch -x86_64 gem install ffi
    
    #2 Re-install dependencies
    arch -x86_64 pod install
    
    1. Open ios/Pods/Pods.xcodeproj in Xcode
    2. Change the iOS Deployment info from 8.0 to 9.0
    
    From xcode clean / build again / run. Hope this should work. Before please confirm whether all the build settings for iOS configured properly or not.
    
    Check platform :ios, '10.0' is uncommented
    
    target 'CustomImageNotifications' do
      use_frameworks!
      pod 'Firebase/Analytics'
      pod 'Firebase/Messaging'
    end 
    
    flutter clean
    rm -Rf ios/Pods
    rm -Rf ios/.symlinks
    rm -Rf ios/Flutter/Flutter.framework
    rm -Rf ios/Flutter/Flutter.podspec
    rm ios/Podfile
    
    cd ios
    flutter pub get
    pod cache clean --all
    pod install
    
        or  (below for m1 chip incase above command thrown error in pod install)
    
    #1 Install ffi
    sudo arch -x86_64 gem install ffi
    
    #2 Re-install dependencies
    arch -x86_64 pod install
    
    1. Open ios/Pods/Pods.xcodeproj in Xcode
    2. Change the iOS Deployment info from 8.0 to 9.0
    
    From xcode clean / build again / run. Hope this should work. Before please confirm whether all the build settings for iOS configured properly or not.
    
    Check platform :ios, '10.0' is uncommented
    
    target 'CustomImageNotifications' do
      use_frameworks!
      pod 'Firebase/Analytics'
      pod 'Firebase/Messaging'
    end 
    
    flutter clean
    rm -Rf ios/Pods
    rm -Rf ios/.symlinks
    rm -Rf ios/Flutter/Flutter.framework
    rm -Rf ios/Flutter/Flutter.podspec
    rm ios/Podfile
    
    cd ios
    flutter pub get
    pod cache clean --all
    pod install
    
        or  (below for m1 chip incase above command thrown error in pod install)
    
    #1 Install ffi
    sudo arch -x86_64 gem install ffi
    
    #2 Re-install dependencies
    arch -x86_64 pod install
    
    1. Open ios/Pods/Pods.xcodeproj in Xcode
    2. Change the iOS Deployment info from 8.0 to 9.0
    
    From xcode clean / build again / run. Hope this should work. Before please confirm whether all the build settings for iOS configured properly or not.
    
    Check platform :ios, '10.0' is uncommented
    
    target 'CustomImageNotifications' do
      use_frameworks!
      pod 'Firebase/Analytics'
      pod 'Firebase/Messaging'
    end 
    
    flutter clean
    rm -Rf ios/Pods
    rm -Rf ios/.symlinks
    rm -Rf ios/Flutter/Flutter.framework
    rm -Rf ios/Flutter/Flutter.podspec
    rm ios/Podfile
    
    cd ios
    flutter pub get
    pod cache clean --all
    pod install
    
        or  (below for m1 chip incase above command thrown error in pod install)
    
    #1 Install ffi
    sudo arch -x86_64 gem install ffi
    
    #2 Re-install dependencies
    arch -x86_64 pod install
    
    1. Open ios/Pods/Pods.xcodeproj in Xcode
    2. Change the iOS Deployment info from 8.0 to 9.0
    
    From xcode clean / build again / run. Hope this should work. Before please confirm whether all the build settings for iOS configured properly or not.
    
    Check platform :ios, '10.0' is uncommented
    
    target 'CustomImageNotifications' do
      use_frameworks!
      pod 'Firebase/Analytics'
      pod 'Firebase/Messaging'
    end 
    
    flutter clean
    rm -Rf ios/Pods
    rm -Rf ios/.symlinks
    rm -Rf ios/Flutter/Flutter.framework
    rm -Rf ios/Flutter/Flutter.podspec
    rm ios/Podfile
    
    cd ios
    flutter pub get
    pod cache clean --all
    pod install
    
        or  (below for m1 chip incase above command thrown error in pod install)
    
    #1 Install ffi
    sudo arch -x86_64 gem install ffi
    
    #2 Re-install dependencies
    arch -x86_64 pod install
    
    1. Open ios/Pods/Pods.xcodeproj in Xcode
    2. Change the iOS Deployment info from 8.0 to 9.0
    
    From xcode clean / build again / run. Hope this should work. Before please confirm whether all the build settings for iOS configured properly or not.
    
    Check platform :ios, '10.0' is uncommented
    
    target 'CustomImageNotifications' do
      use_frameworks!
      pod 'Firebase/Analytics'
      pod 'Firebase/Messaging'
    end 
    
    % flutter clean
    
    % cd ios
    % arch -x86_64 pod update
    

    Why does JavaScript's parseInt(0.0000005) print &quot;5&quot;?

    copy iconCopydownload iconDownload
    String(0.5);      // => '0.5'
    String(0.05);     // => '0.05'
    String(0.005);    // => '0.005'
    String(0.0005);   // => '0.0005' 
    String(0.00005);  // => '0.00005'
    String(0.000005); // => '0.000005'
    
    String(0.0000005); // => '5e-7'
    
    let n = '0.0000005';
    console.log(parseInt(n))
    

    Is there an identity index value in JavaScript?

    copy iconCopydownload iconDownload
    const self = Symbol('self');
    
    Object.defineProperty(Object.prototype, self, {
        enumerable: false,
        get() { "use strict"; return this; }
    });
    

    Rails 7 - link_to with method :delete still performs GET request

    copy iconCopydownload iconDownload
    <%= link_to "Sign Out", destroy_user_session_path, data: { "turbo-method": :delete } %>
    
    <%= button_to 'Sign Out', destroy_user_session_path, method: :delete %>
    
    <%= link_to 'Sign Out', destroy_user_session_path, data: {turbo_method: :delete} %>
    
    <%= button_to 'Sign Out', destroy_user_session_path, method: :delete,
      form: {data: {turbo_confirm: 'Are you sure?'}} %>
    
    <%= link_to 'Sign Out', destroy_user_session_path,
      data: {turbo_method: :delete, turbo_confirm: 'Are you sure?'} %>
    
    <%= button_to 'Sign Out', destroy_user_session_path, method: :delete %>
    
    <%= link_to 'Sign Out', destroy_user_session_path, data: {turbo_method: :delete} %>
    
    <%= button_to 'Sign Out', destroy_user_session_path, method: :delete,
      form: {data: {turbo_confirm: 'Are you sure?'}} %>
    
    <%= link_to 'Sign Out', destroy_user_session_path,
      data: {turbo_method: :delete, turbo_confirm: 'Are you sure?'} %>
    
    <%= button_to 'Sign Out', destroy_user_session_path, method: :delete %>
    
    <%= link_to 'Sign Out', destroy_user_session_path, data: {turbo_method: :delete} %>
    
    <%= button_to 'Sign Out', destroy_user_session_path, method: :delete,
      form: {data: {turbo_confirm: 'Are you sure?'}} %>
    
    <%= link_to 'Sign Out', destroy_user_session_path,
      data: {turbo_method: :delete, turbo_confirm: 'Are you sure?'} %>
    
    <%= button_to 'Sign Out', destroy_user_session_path, method: :delete %>
    
    <%= link_to 'Sign Out', destroy_user_session_path, data: {turbo_method: :delete} %>
    
    <%= button_to 'Sign Out', destroy_user_session_path, method: :delete,
      form: {data: {turbo_confirm: 'Are you sure?'}} %>
    
    <%= link_to 'Sign Out', destroy_user_session_path,
      data: {turbo_method: :delete, turbo_confirm: 'Are you sure?'} %>
    

    Flutter Web: Cannot scroll with mouse down (drag) (Flutter 2.5+)

    copy iconCopydownload iconDownload
    class MyCustomScrollBehavior extends MaterialScrollBehavior {
      // Override behavior methods and getters like dragDevices
      @override
      Set<PointerDeviceKind> get dragDevices => { 
        PointerDeviceKind.touch,
        PointerDeviceKind.mouse,
        // etc.
      };
    }
    
    // ScrollBehavior can be set for a specific widget.
    final ScrollController controller = ScrollController();
    ScrollConfiguration(
      behavior: MyCustomScrollBehavior(),
      child: ListView.builder(
        controller: controller,
        itemBuilder: (BuildContext context, int index) {
         return Text('Item $index');
        }
      ),
    );
    
    ScrollConfiguration(
        behavior: ScrollConfiguration.of(context).copyWith(dragDevices: {
          PointerDeviceKind.touch,
          PointerDeviceKind.mouse,
        },),
        child: ListView(
          controller: _controller,
          physics: const AlwaysScrollableScrollPhysics(),
          scrollDirection: Axis.horizontal,
          children: <Widget>[
          
              for (int index = 0; index < showThumbnailList.length; index++) _thumbnail(showThumbnailList[index], index)
           
            // showThumbnailList.map((x) => _thumbnail(x) ).toList()),
          ],
        ),
      ),
    
    class MyApp extends StatelessWidget {
      @override
      Widget build(BuildContext context) {
        return MaterialApp(
          scrollBehavior: MaterialScrollBehavior().copyWith(
            dragDevices: {PointerDeviceKind.mouse, PointerDeviceKind.touch, PointerDeviceKind.stylus, PointerDeviceKind.unknown},
          ),
          ...
    

    FirebaseOptions cannot be null when creating the default app

    copy iconCopydownload iconDownload
    void main() async {
      WidgetsFlutterBinding.ensureInitialized();
      await Firebase.initializeApp(
        // Replace with actual values
        options: FirebaseOptions(
          apiKey: "XXX",
          appId: "XXX",
          messagingSenderId: "XXX",
          projectId: "XXX",
        ),
      );
      runApp(MyApp());
    }
    
    dart pub global activate flutterfire_cli
    
    flutterfire configure
    
    void main() async {
      WidgetsFlutterBinding.ensureInitialized();
      await Firebase.initializeApp(
        options: DefaultFirebaseOptions.currentPlatform,
      );
      runApp(MyApp());
    }
    
      <script src="https://www.gstatic.com/firebasejs/8.6.1/firebase-app.js"></script>
      <script src="https://www.gstatic.com/firebasejs/8.6.1/firebase-analytics.js"></script>
      <script>
        var firebaseConfig = {
          apiKey: "xxx",
          authDomain: "xxx",
          projectId: "xx",
          storageBucket: "exxx",
          messagingSenderId: "xxx",
          appId: "xxx",
          measurementId: "xxx"
        };
    
        firebase.initializeApp(firebaseConfig);
        firebase.analytics();
      </script>
    
    void main() async {
      WidgetsFlutterBinding.ensureInitialized();
      await Firebase.initializeApp(
        // Replace with actual values
        options: FirebaseOptions(
          apiKey: "XXX",
          appId: "XXX",
          messagingSenderId: "XXX",
          projectId: "XXX",
        ),
      );
      runApp(MyApp());
    }
    
    dart pub global activate flutterfire_cli
    
    flutterfire configure
    
    void main() async {
      WidgetsFlutterBinding.ensureInitialized();
      await Firebase.initializeApp(
        options: DefaultFirebaseOptions.currentPlatform,
      );
      runApp(MyApp());
    }
    
      <script src="https://www.gstatic.com/firebasejs/8.6.1/firebase-app.js"></script>
      <script src="https://www.gstatic.com/firebasejs/8.6.1/firebase-analytics.js"></script>
      <script>
        var firebaseConfig = {
          apiKey: "xxx",
          authDomain: "xxx",
          projectId: "xx",
          storageBucket: "exxx",
          messagingSenderId: "xxx",
          appId: "xxx",
          measurementId: "xxx"
        };
    
        firebase.initializeApp(firebaseConfig);
        firebase.analytics();
      </script>
    
    void main() async {
      WidgetsFlutterBinding.ensureInitialized();
      await Firebase.initializeApp(
        // Replace with actual values
        options: FirebaseOptions(
          apiKey: "XXX",
          appId: "XXX",
          messagingSenderId: "XXX",
          projectId: "XXX",
        ),
      );
      runApp(MyApp());
    }
    
    dart pub global activate flutterfire_cli
    
    flutterfire configure
    
    void main() async {
      WidgetsFlutterBinding.ensureInitialized();
      await Firebase.initializeApp(
        options: DefaultFirebaseOptions.currentPlatform,
      );
      runApp(MyApp());
    }
    
      <script src="https://www.gstatic.com/firebasejs/8.6.1/firebase-app.js"></script>
      <script src="https://www.gstatic.com/firebasejs/8.6.1/firebase-analytics.js"></script>
      <script>
        var firebaseConfig = {
          apiKey: "xxx",
          authDomain: "xxx",
          projectId: "xx",
          storageBucket: "exxx",
          messagingSenderId: "xxx",
          appId: "xxx",
          measurementId: "xxx"
        };
    
        firebase.initializeApp(firebaseConfig);
        firebase.analytics();
      </script>
    
    void main() async {
      WidgetsFlutterBinding.ensureInitialized();
      await Firebase.initializeApp(
        // Replace with actual values
        options: FirebaseOptions(
          apiKey: "XXX",
          appId: "XXX",
          messagingSenderId: "XXX",
          projectId: "XXX",
        ),
      );
      runApp(MyApp());
    }
    
    dart pub global activate flutterfire_cli
    
    flutterfire configure
    
    void main() async {
      WidgetsFlutterBinding.ensureInitialized();
      await Firebase.initializeApp(
        options: DefaultFirebaseOptions.currentPlatform,
      );
      runApp(MyApp());
    }
    
      <script src="https://www.gstatic.com/firebasejs/8.6.1/firebase-app.js"></script>
      <script src="https://www.gstatic.com/firebasejs/8.6.1/firebase-analytics.js"></script>
      <script>
        var firebaseConfig = {
          apiKey: "xxx",
          authDomain: "xxx",
          projectId: "xx",
          storageBucket: "exxx",
          messagingSenderId: "xxx",
          appId: "xxx",
          measurementId: "xxx"
        };
    
        firebase.initializeApp(firebaseConfig);
        firebase.analytics();
      </script>
    
    void main() async {
      WidgetsFlutterBinding.ensureInitialized();
      await Firebase.initializeApp(
        // Replace with actual values
        options: FirebaseOptions(
          apiKey: "XXX",
          appId: "XXX",
          messagingSenderId: "XXX",
          projectId: "XXX",
        ),
      );
      runApp(MyApp());
    }
    
    dart pub global activate flutterfire_cli
    
    flutterfire configure
    
    void main() async {
      WidgetsFlutterBinding.ensureInitialized();
      await Firebase.initializeApp(
        options: DefaultFirebaseOptions.currentPlatform,
      );
      runApp(MyApp());
    }
    
      <script src="https://www.gstatic.com/firebasejs/8.6.1/firebase-app.js"></script>
      <script src="https://www.gstatic.com/firebasejs/8.6.1/firebase-analytics.js"></script>
      <script>
        var firebaseConfig = {
          apiKey: "xxx",
          authDomain: "xxx",
          projectId: "xx",
          storageBucket: "exxx",
          messagingSenderId: "xxx",
          appId: "xxx",
          measurementId: "xxx"
        };
    
        firebase.initializeApp(firebaseConfig);
        firebase.analytics();
      </script>
    
     class Configurations {
          static const _apiKey = "Your values";
          static const _authDomain = "Your values";
          static const _projectId = "Your values";
          static const _storageBucket = "Your values"
          static const _messagingSenderId ="Your values"
          static const _appId = "Your values"
        
    //Make some getter functions
          String get apiKey => _apiKey;
          String get authDomain => _authDomain;
          String get projectId => _projectId;
          String get storageBucket => _storageBucket;
          String get messagingSenderId => _messagingSenderId;
          String get appId => _appId;
        }
    
    lib/config
    
    import 'config/config.dart';
    
    final configurations = Configurations();
    Future<void> init() async {
            await Firebase.initializeApp(
                options: FirebaseOptions(
                    apiKey: configurations.apiKey,
                    appId: configurations.appId,
                    messagingSenderId: configurations.messagingSenderId,
                    projectId: configurations.projectId));
    
     class Configurations {
          static const _apiKey = "Your values";
          static const _authDomain = "Your values";
          static const _projectId = "Your values";
          static const _storageBucket = "Your values"
          static const _messagingSenderId ="Your values"
          static const _appId = "Your values"
        
    //Make some getter functions
          String get apiKey => _apiKey;
          String get authDomain => _authDomain;
          String get projectId => _projectId;
          String get storageBucket => _storageBucket;
          String get messagingSenderId => _messagingSenderId;
          String get appId => _appId;
        }
    
    lib/config
    
    import 'config/config.dart';
    
    final configurations = Configurations();
    Future<void> init() async {
            await Firebase.initializeApp(
                options: FirebaseOptions(
                    apiKey: configurations.apiKey,
                    appId: configurations.appId,
                    messagingSenderId: configurations.messagingSenderId,
                    projectId: configurations.projectId));
    
     class Configurations {
          static const _apiKey = "Your values";
          static const _authDomain = "Your values";
          static const _projectId = "Your values";
          static const _storageBucket = "Your values"
          static const _messagingSenderId ="Your values"
          static const _appId = "Your values"
        
    //Make some getter functions
          String get apiKey => _apiKey;
          String get authDomain => _authDomain;
          String get projectId => _projectId;
          String get storageBucket => _storageBucket;
          String get messagingSenderId => _messagingSenderId;
          String get appId => _appId;
        }
    
    lib/config
    
    import 'config/config.dart';
    
    final configurations = Configurations();
    Future<void> init() async {
            await Firebase.initializeApp(
                options: FirebaseOptions(
                    apiKey: configurations.apiKey,
                    appId: configurations.appId,
                    messagingSenderId: configurations.messagingSenderId,
                    projectId: configurations.projectId));
    

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    QUESTION

    Javascript dynamically inserted later on: how to make it run?

    Asked 2022-Apr-17 at 14:12

    I have scripts In my React app that are inserted dynamically later on. The scripts don't load.

    In my database there is a field called content, which contains data that includes html and javascript. There are many records and each record can include multiple scripts in the content field. So it's not really an option to statically specify each of the script-urls in my React app. The field for a record could for example look like:

    <p>Some text and html</p>
    <div id="xxx_hype_container">
        <script type="text/javascript" charset="utf-8" src="https://example.com/uploads/hype_generated_script.js?499892"></script>
    </div>
    <div style="display: none;" aria-hidden="true"> 
    <div>Some text.</div> 
    Etc…
    

    I call on this field in my React app using dangerouslySetInnerHTML:

    render() {
        return (
            <div data-page="clarifies">
                <div className="container">
                    <div dangerouslySetInnerHTML={{ __html: post.content }} />
                    ... some other data
                </div>
            </div>
        );
    }
    

    It correctly loads the data from the database and displays the html from that data. However, the Javascript does not get executed. I think the script doesn't work because it is dynamically inserted later on. How can I make these scripts work/run?

    This post suggest a solution for dynamically inserted scripts, but I don't think I can apply this solution because in my case the script/code is inserted from a database (so how to then use nodeScriptReplace on the code...?). Any suggestions how I might make my scripts work?


    Update in response to @lissettdm their answer:

    constructor(props) {
        this.ref = React.createRef();
    }
    
    componentDidUpdate(prevProps, prevState) {
        if (prevProps.postData !== this.props.postData) {
            this.setState({
                loading: false,
                post: this.props.postData.data,
                //etc
            });
            setTimeout(() => parseElements());
    
            console.log(this.props.postData.data.content);
            // returns html string like: `<div id="hype_container" style="margin: auto; etc.`
            const node = document.createRange().createContextualFragment(this.props.postData.data.content);
            console.log(JSON.stringify(this.ref));
            // returns {"current":null}
            console.log(node);
            // returns [object DocumentFragment]
            this.ref.current.appendChild(node);
            // produces error "Cannot read properties of null"
        }
    }
    
    render() {
        const { history } = this.props;
        /etc.
        return (
            {loading ? (
                some code
            ) : (
                <div data-page="clarifies">
                    <div className="container">
                        <div ref={this.ref}></div>
                        ... some other data
                    </div>
                </div>
            );
        );
    }
    

    The this.ref.current.appendChild(node); line produces the error:

    TypeError: Cannot read properties of null (reading 'appendChild')

    ANSWER

    Answered 2022-Apr-14 at 19:05

    Rendering raw HTML without React recommended method is not a good practice. React recommends method dangerouslySetInnerHTML to render raw HTML.

    Source https://stackoverflow.com/questions/71876427

    Community Discussions, Code Snippets contain sources that include Stack Exchange Network

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