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Checking If/Else Condition in Alert Message using React

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by Abdul Rawoof A R dot icon Updated: Feb 16, 2023

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In React, conditional rendering works in similar way conditions work in JavaScript. It uses JavaScript operators like if to the conditional operator to create elements representing the current state and then let React update the user interface to match them.


To apply conditions on the button in React, we can use state in React and then declare the state in the constructor method because it loads first when the component of React is loaded. To toggle between user and admin in React, we need to use an event handler to handle the situation. The difference between the condition and if-statement is that the conditional operator is a single programming statement. In contrast, the if-else statement is a programming block in which statements come under the parenthesis. A conditional operator is also used to assign a variable value, but the if-else statement cannot be used for assignment purposes. We are using the "if-else" statement to execute both the true and the false part of a user-given condition. The if block code is executed if the condition is true, and the else block code is executed if the condition is false. Likewise, in this kit, if the user enters their name into the text box, the system will not show any alert message to the user. If the user forgets to enter their name into the text box, the system will send an alert message to the user as "Name should not be empty!". It helps us to fill out the forms or applications without leaving any blank spaces.


Here is an example of how you can check the if/else condition in Alert Message using React:

Fig : Preview of the output that you will get on running this code from your IDE.

Code

In this solution we're using React library.

how to check if eles condition in alert in reactjs

JavaScriptdotLines of Code : 43dotLicense : Strong Copyleft (CC BY-SA 4.0)

Dependent Libraries : 
import React from "react";
import ReactDOM from "react-dom";

import "./styles.css";

class App extends React.Component {
  constructor(props) {
    super(props);
    this.state = { name: "" };
  }

  handleClick = (event) => {
    if (!this.state.name) {
      alert("Name should not be empty !");
    }
  };
  changeHandler = (event) => {
    this.setState({ name: event.target.value });
  };

  render() {
    return (
      <div className="App">
        Name :
        <input
          id="name"
          type="text"
          placeholder="Name"
          name="aname"
          value={this.state.name}
          onChange={this.changeHandler}
        />
        <button className="btn btn-danger" onClick={this.handleClick}>
          submit
        </button>
      </div>
    );
  }
}

const rootElement = document.getElementById("root");
ReactDOM.render(<App />, rootElement);

Instructions

Follow the steps carefully to get the output easily.

  1. Install the Node.js and React on your IDE(preferable Visual Studio Code).
  2. Create React Application using npx create-react-app foldername.
  3. cd foldername.
  4. Open the folder in IDE.
  5. Copy the code using "copy" button above and paste it in index.js file(remove the earlier code from index.js).
  6. Open the terminal from IDE.
  7. npm start to run the file.


I hope you found this useful. I have added the link to dependent libraries, version information in the following sections.


I found this code snippet by searching for 'how to check if else condition on alert message using react' in kandi. You can try any such use case!

Environment Tested

I tested this solution in the following versions. Be mindful of changes when working with other versions.

  1. The solution is created in Visual Studio Code 1.73.1.
  2. The solution is tested on node v18.12.1 and npm v8.19.2.
  3. React version-18.2.0.


Using this solution, we are able to check if/else condition on alert message using React with simple steps. This process also facilities an easy way to use, hassle-free method to create a hands-on working version of code which would help us to check if/else condition on alert message using React.

Dependent Library

reactby facebook

JavaScript doticonstar image 209050 doticonVersion:v18.2.0doticon
License: Permissive (MIT)

The library for web and native user interfaces

Support
    Quality
      Security
        License
          Reuse

            reactby facebook

            JavaScript doticon star image 209050 doticonVersion:v18.2.0doticon License: Permissive (MIT)

            The library for web and native user interfaces
            Support
              Quality
                Security
                  License
                    Reuse

                      You can also search for any dependent libraries on kandi like 'react'.

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