flask-vue-spa | Vue.js SPA served over Flask microframework | Single Page Application library
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Trending Discussions on Single Page Application
Trending Discussions on Single Page Application
QUESTION
I am using react.js for Single Page Applications. routing codes are inside the src --> routes.js I have referred many pages for this one of the pages is https://blog.logrocket.com/adding-dynamic-meta-tags-react-app-without-ssr/ but I don't know where to implement this. I have done exactly what they mentioned but normally we are using "npm start" to run the front-end. even after doing " npm run server" it's showing listening on port 3000. but meta tag values are still like this "title_" .
please refer to any ideology to implement this.
ANSWER
Answered 2022-Mar-18 at 13:49We can use a react helmet to change the meta content dynamically on each page. In my case, I use the helmet on my header , because all the pages on the site have a header. from the header, we can change the meta content dynamically.
render(){
return(<>
{this.state.metaContent.meta_title}
//your content
)}
QUESTION
I read through a lot of similar topics, but didn't find the right answer, so please help me.
Let's say the user types in a non-existing sub directory to my webpage:
www.example.com/subpage-1
What I want to achieve:
I want my mainpage (www.example.com - actually with hidden index.html) to open, but keep the URL unchanged with the non-existing subpage (www.example.com/subpage-1).
The reason why I need it: I have the website only with the main site (index.html), and everything is controlled via JavaScript dynamically.
I want to introduce sub pages - but I want to use only my main index.html site with JS to control it. (Just like a single page application.)
So when the user enters the URL www.example.com/subpage-1, my main site opens, but since the URL is kept unchanged, the JS script can check the URL, see, that subpage-1 is requested, and generate the right content for it (if subpage-1 is supported, of course).
Also that could be a SEO-friendly solution, since I could provide Google a sitemap with the available subpages as well - however everything would be controlled via the same index.html and JS.
How can I achieve it?
What I found so far:
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.+)$ index.html?url=$1 [QSA,L]
My problem with this is that it opens the main page every time, I can't find the query (?url=) anywhere, so I can't use it.
Also a problem what I don't know how to handle: Let's say the user enters www.example.com/subpage-1 and it's working fine since my JS script handles "subpage-1".
But what if
www.example.com/non-existing-subpage
is entered? With the solution above it would open the main page again, but JS can't load any content for it. I still want 404 for all of the non existing subpages. How can I achieve it?
ANSWER
Answered 2022-Mar-11 at 01:39RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.+)$ index.html?url=$1 [QSA,L]
My problem with this that however it opens the main page every time, I can't find the query (?url=) anywhere, so I can't use it.
This is an internal rewrite on the server. Consequently, the url URL parameter (present only on the internal rewrite) is only available to a server-side script, not client-side JavaScript. The browser/client only sees the response from the server - it is not aware of what file produced that response. However, client-side JavaScript can see what is present in the browser's address bar, which is accessible via the window.location object.
So, you can instead simplify the RewriteRule directive:
RewriteRule . index.html [L]
And in your JS you can read the requested URL-path from the window.location.pathname property. For example, if you request example.com/foo then the pathname property contains /foo (with a slash prefix) for you to act on accordingly in your script.
I still want 404 for all of the non existing subpages. How can I achieve it?
You can't if you are only using client-side JavaScript. A "404 Not Found" status is an HTTP response sent from the server.
The best you can do in client-side JS is to display what looks-like a "404 Not Found" message to the user and make sure you have a robots meta tag that prevents indexing. But this is still served with a 200 OK HTTP status. Search engines (ie. Google) will likely see this as a soft-404 (ie. a page that looks like a 404, but is served with a 200 OK status).
If you want to serve a 404 HTTP response status then the server would need to be aware of which are valid/invalid URLs.
QUESTION
I have a website which had 5 screens but now due to customers demand we are converting them to a Single page on which each screen is displayed on scroll-like all 5 screens are showing on one page with scroll, so we had page view for each screen on old version but now because of single page application, how should I send pageview data to google analytics on each section view?The image shows how before the new work and after the new work screens are displaying.
ANSWER
Answered 2022-Jan-31 at 19:26This is more of a design question. It's completely up to the person who uses the data. A pageview is not only a metric, it sets the page dimension that is then being used in all events before the next pageview overwrites it. Therefore, when you fire a pageview, you have to make sure the dp/dl dimensions of those pageviews are actually different and indicate what pseudo page users navigate to.
If those pseudo pages have tracked activity on them, then yes, we probably want to set the page for them. But that shouldn't be on button click. Because if the page is scrollable, then now a user can just scroll to our page and get to it efficiently with no button click.
Using pageviews like that is tricky, it entails quite a lot of development. In most cases, simple events suffice, but again, depends on the analyst who consumes the data downstream.
QUESTION
I'm trying to serve two different versions of a single page application - one, built with a brand new, shiny JS framework, and another built with an older, crummier JS framework. All of the important features and functionality are in the new SPA, and all the non-critical in the older SPA and are in the midst of being ported over.
With this in mind, I'm trying to make the older SPA available via a path, e.g. /old-app.
The new app resides in /www/new-app. The old app resides in /www/old-app.
This is what I have tried:
server {
listen 443;
root /www/new-app;
index index.html;
location / { # default to new app
try_files $uri @prerender;
}
location /old-app {
root /www/old-app; # I have also tried *alias* instead of *root* here
index index.html;
try_files $uri @prerender;
}
location @prerender {
set $prerender = 0;
# a bunch of rules for prerender from here: https://gist.github.com/thoop/8165802
if ($prerender = 1) {
proxy_pass http://127.0.0.1:8080/$scheme://$host$request_uri;
}
if ($prerender = 0) {
rewrite .* /index.html break;
}
}
}
The above returns a 200 OK for https://www.domain.example/old-app/, but the page served is not /www/old-app/index.html. Instead, the file served is from /www/new-app/index.html with a blank page, presumably because the new SPA does not understand the provided /, which only the old SPA understands.
ANSWER
Answered 2022-Jan-26 at 10:33Two things are wrong here.
location /old-app {
root /www/old-app;
This will look for files at /www/old-app/old-app (see this document for details).
try_files $uri @prerender;
This sends all of your routes to the location @prerender block, which ends with rewrite .* /index.html break;
There may be a more elegant solution, but you could just add a second "prerender" block, for example location @oldrender which is similar to the original, but ends with rewrite ^ /old-app/index.html last;
For example:
location /old-app {
root /www;
try_files $uri @oldrender;
}
location @oldrender {
...
rewrite ^ /old-app/index.html last;
...
}
Notice the root has changed, and you need to use rewrite...last.
QUESTION
I have a main domain, eg.: mydomain.com.
A Single Page Application: myApp, hosted on: myApp.somehost.com (IP: {ip.of.myapp}).
A WordPress Site: myWP, hosted on: myWP.anotherhost.com (IP: {ip.of.mywp}).
The goal:
- mydomain.com should show myWP (this is straight forward, I need an A record in my DNS NameServer, with {ip.of.mywp})
- mydomain.com/app should show myApp.
How would you solve the second one? Is there a frontend-proxy service provider or so?
What I tried:
- Cloudflare CDN: rewriting the hostname is not allowed.
- Vercel: here I can host static pages (myApp) and proxy certain subpaths. But not the root url! So mydomain.com can't show myWp
What should I do? Please help... Thanks
Note: I'm not planning to move myApp and myWP from their current servers.
ANSWER
Answered 2022-Jan-05 at 13:42You are correct about rewrite rules not supporting this with Cloudflare, but you can use Cloudflare Workers to act as a proxy. Here is a blog article going over details of one way you could achieve what you are looking for -
https://blog.cloudflare.com/subdomains-vs-subdirectories-improved-seo-part-2/
Here are also a number of other Worker examples that may come in handy -
https://developers.cloudflare.com/workers/examples
Do keep in mind the pricing / limits of free plan if you go this route - https://developers.cloudflare.com/workers/platform/pricing
QUESTION
Flutter Web after deploy in server 404 will appear I know flutter is single page application so we configure the .htaccess file
RewriteEngine on
RewriteCond %{REQUEST_FILENAME}% !-d
RewriteCond %{REQUEST_FILENAME}% !-f
RewriteRule . /index.html [L]
but I use one static html file render in app so this method is not working and also I tried 404.html. No use please help me
ANSWER
Answered 2022-Jan-03 at 20:16RewriteCond %{REQUEST_FILENAME}% !-d
RewriteCond %{REQUEST_FILENAME}% !-f
You have an erroneous literal % at the end of the TestString argument, so these negated conditions will always be successful, including when the request is rewritten to /index.html.
These conditions should be written:
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
But note that for requests to the document root to be correctly rewritten you need to ensure that the DirectoryIndex is correctly set. For example:
DirectoryIndex index.html
QUESTION
I've learned in this SO question that there currently is no simple way to turn cookie-based CSRF tokens into HTTP request headers in Elm. Thus, to write a single page application (SPA) that works nicely with a Django Rest Framework backend, I need to manually retrieve the CSRF-Token from the corresponding cookie value.
How do I retrieve a cookie value in Elm? Does Elm provide runtime support for this via some Command? Or do I need to retrieve the cookie using plain JavaScript and provide it to the ELM SPA via a port?
ANSWER
Answered 2021-Dec-05 at 21:16As of Elm 0.9, you need to use Ports to read the cookie from JavaScript and pass it back to the Elm application.
In my application, I do the following. I define a fetchCsrfToken port that I use from Elm to call a JavaScript function that reads the cookie. That function then triggers a callback to Elm via a csrfTokenReciever port. My Elm application subscribes to that event via subscriptions.
-- Ports.elm
port fetchCsrfToken : () -> Cmd msg
port csrfTokenReciever : (String -> msg) -> Sub msg
-- Main.elm
init : Flags -> Url -> Key -> ( Model, Cmd Msg )
init flags url key =
-- ...
(model, Ports.fetchCsrfToken ())
subscriptions : Model -> Sub Msg
subscriptions model =
Ports.csrfTokenReciever GotCsrfToken
// index.js
app.ports.fetchCsrfToken.subscribe(function (str) {
const value = getCookie('csrftoken')
if (value === null) {
app.ports.csrfTokenReciever.send('')
} else {
app.ports.csrfTokenReciever.send(value)
}
})
QUESTION
I'm using Tailwind (react/next) and struggle to change the way my scrollbar looks.
It's a single page application and I have been trying to create custom CSS to apply to the first div in my index file, like this:
<<<<<<<--------- Adding custom css here
Oscar Ekstrand
I can get custom CSS classes to work for things like buttons, both with a "plugin-approach" and having a global style sheet. (https://play.tailwindcss.com/zQftpiBCmf)
But I can't understand how to change the look of my scrollbar.
Anyone got an idea?
ANSWER
Answered 2021-Oct-01 at 17:53Tailwind CSS doesn't provide a built-in way to customise the scrollbar styling. However, you can use the various ::-webkit-scrollbar pseudo-elements to style it.
Tailwind playground link: https://play.tailwindcss.com/5samiwyr4v.
.scrollbar::-webkit-scrollbar {
width: 20px;
height: 20px;
}
.scrollbar::-webkit-scrollbar-track {
border-radius: 100vh;
background: #f7f4ed;
}
.scrollbar::-webkit-scrollbar-thumb {
background: #e0cbcb;
border-radius: 100vh;
border: 3px solid #f6f7ed;
}
.scrollbar::-webkit-scrollbar-thumb:hover {
background: #c0a0b9;
}
QUESTION
It looks like when Google Cloud Storage serves the desired object for a NotFoundPage, it includes the status code 404.
Is there any way to set it so that the content is served with a 200 status? This will make it easier for any single page applications I deploy to the bucket to manage their own deep linking.
ANSWER
Answered 2021-Dec-07 at 15:27It appears as though this is currently a feature request over at the Google Cloud issue tracker: https://issuetracker.google.com/issues/151212194
I encourage anyone who arrives here to head over there and star the issue and also comment to help get this some priority.
QUESTION
I am writing a single page application in Elm to interface with a Django backend. The Django Rest Framework provides a CSRF token in a cookie but expects all requests to contain the token in an HTTP header.
Is there a way to declaratively instruct Elm to return the CSRF token as HTTP header with each request? E.g., along the line how I would configure it in JS/Axios:
axios.defaults.xsrfCookieName = 'csrftoken'
axios.defaults.xsrfHeaderName = "X-CSRFTOKEN"
There is an old SO question that implies to manually extract the token from the cookie and then use Http.send for each request. That would mean to wrap all HTTP request functions by hand.
ANSWER
Answered 2021-Dec-03 at 14:07Using version 2.0.0 of the elm/http library, you would need to use request in order to provide headers. It's fairly common for an application to use a customized version of these "base" methods that ask for whatever your environment requires.
get httpConfig route tagger decoder =
Http.request
{ method = "GET"
, headers = httpConfig.headers
, url = httpConfig.baseUrl ++ route
, body = Http.emptyBody
, expect = Http.expectJson tagger decoder
, timeout = Nothing
, tracker = Nothing
}
post httpConfig route value tagger decoder =
Http.request
{ method = "POST"
, headers = httpConfig.headers
, url = httpConfig.baseUrl ++ route
, body = Http.stringBody "application/vnd.api+json" (Encode.encode 0 value)
, expect = Http.expectJson tagger decoder
, timeout = Nothing
, tracker = Nothing
}
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