Can't load content inside a div - javascript

I am trying to load some content inside a div #display. I have read many questions regarding this matter here, but still I have been unable to get it working. The alert function which I have just added for testing purpose works without any problem.
Here is what I have tried
$(document).ready(function(){
$('#townships').click(function() {
$('#display').load("helloworld.html");
alert("Hi");
});
});
I am trying this offline. The helloworld.html file is in the same folder with the homepage file.

I am trying this offline
I believe this is your problem. AJAX requests to the local filesystem will be blocked by the browsers' security settings.
You need to run it under a webserver, either on your local machine, such as WAMP/LAMP/IIS or on a remote machine.

You can not do AJAX request without loading files from some server. Doing it by loading files from file system won't work because of SAME ORIGIN policy. Since there is no domain to compare to the AJAX requests fail. You can see the exception while doing it in Chrome.
This is relevant
AJAX code do not run locally

You should put your html file in a web server. If you have python installed, you can just type
python -m SimpleHTTPServer [port]``
In order to have a rapid web server in your working directory.

Related

Keep getting ERR_HTTP2_PROTOCOL_ERROR when saving to file

The Problem:
I edit an asset file such has .js or .css via my code editor Sublime Editor 3. I then save those files to the server via an SFTP plugin on sublime. Then when I refresh the live website to view changes from my chrome browser (I have a plugin that flushes the browser cache so I see new changes.) I sometimes get a error on the chrome console that reads:
net::ERR_HTTP2_PROTOCOL_ERROR 200
Where the browser is not served the requested file. When I check my log file for Apache I see the following:
[alert] 657967#657967: *188534 pread() read only 7497 of 7498
My server is setup with Nginx running as a Web Server and Reverse Proxy for Apache.
How can I make it so that Nginx does not fail server the requested files even though they were just edited. Maybe sending back cache until it updates the new changes. Please advise because it is driving me nuts and I have no idea how to overcome it.
My workflow for JavaScript consists of me writing code and refreshing the live site to view web console on chrome. I need to be able to view the changes I made from the server via browser. I don't like local environments. I tried to google this topic many times with no luck so any help would be much appreciated.

Load html content on a local machine

I have developed some touchscreen content that will be run on a local machine at an event. It will be run full screen using Chrome, and I need to load various html content dynamically into a container. Is this possible, as the usual JQuery load() and ajax methods only seem to work when running off of a server. All the content sits in its own folder as a html file, so I just need to point to the correct html file as and when needed.
Is there a way to do this when all content is being run locally?
It sounds like you're not running an http server. You can't get ajax from the file:// protocol. You need to run a local http server.
If your backend language is javascript, you should run nodejs
If your backend is php you should probably run apache2

jQuery .load() with Relative Path - XMLHttpRequest Cannot Load - Workaround?

I have a locally-stored project whose directory structure is the following (I minimized non-relevant folders):
What I want to do is that in an HTML file, like index.html, to add a <header> such that its contents would be loaded from an external HTML file, so all of what I'll have to write in index.html would be <header>, and my solution would load the content automatically.
To do this, I'd like to use JavaScript (preferably jQuery, but I'll accept other solutions if they work and jQuery doesn't, or if they work and executed faster than jQuery).
I don't think that I should use an <iframe> due to the fact that it'd probably increase loading times more than using jQuery/JavaScript (which, like I said, is what works now, when the website is live).
Right now, I'm using the jQuery .load() function. I don't know much about jQuery, but I've been told that it should work locally - and it doesn't, for me.
My browser's console shows me the problem:
jquery-3.1.1.min.js:4 XMLHttpRequest cannot load file:///C:/Users/GalGr/Desktop/eiomw/header.html. Cross origin requests are only supported for protocol schemes: http, data, chrome, chrome-extension, https, chrome-extension-resource.
And I'm trying to overcome it.
This code works on my live website - it might not be updated to the code of the files that I linked to below, but it doesn't matter - their code matters.
This is the index.html file:
index.html
This is the header.html file:
header.html
This is `main_script.js:
main_script
The reason you're having a problem with this locally is mainly down to security measures in your browser.
Essentially whenever you're using jQuery's load() function it makes a separate HTTP request (approach known as AJAX) for the file or URL you give it.
Modern browsers enforce that the URL you request using AJAX methods is from the same origin (server) as a security feature to stop pages randomly loading content from anywhere on the internet in the background. In your case it seems like this shouldn't affect you because you're browsing your pages locally and the request you're making using load() is also for a local file (header.html).
However, I am assuming you're just opening up the page directly in your browser, so your browser's URL will look something like 'file:///C:/Users...' (similar example in the error message you gave). This means your browser is directly reading the file from disk and interpreting it as HTML to display the page. It seems likely you don't actually have a local HTTP server hosting the page, otherwise the URL would start with 'http://'. It is for this reason that the browser is giving the security error, even though your AJAX request for header.html is technically from the same source as the page it is executed on.
Your server will have an HTTP server which it's using to host the pages, and so everything works fine as you're then using HTTP as normal, and this security feature does not get in your way.
I would suggest that you simply install an HTTP server locally on your dev machine. You don't even need to 'install' one per-se, there are loads of development HTTP servers that just run standalone, so you start them up when you want to browse your local HTML files. As you appear to be on Windows, I'd check out either IIS (Windows' HTTP server) or IIS Express (like IIS but runs standalone). There are also many others available like Apache, Nginx, etc. etc.
If you do this, you can host your pages on something like 'http://localhost/index.html'. Then, any AJAX requests you make for local files will work fine, just like your server.
Hope that makes sense, and I'm not telling you something you already know?
Why not using something more straight foreword like mustache.js ?
I found a solution:
Using phpStorm's built-in localhost, I was able to emulate a server that handles my requests and responses.

AJAX Request Won't Work on Internal Server

I'm using w3schools to try to understand how simple AJAX requests work and I came across this exercise page:
http://www.w3schools.com/jquery/tryit.asp?filename=tryjquery_ajax_load
I thought it was a simple example of an ajax request, so I copied and pasted the code into a plain ajax.htm file and copied and pasted the txt file it refers to:
http://www.w3schools.com/jquery/demo_test.txt
...and saved it as demo_test.txt file it refers to and saved them both in the same folder. (Keep in mind, I have an Apache server that processes PHP locally with no problem, so I would think a simple request like this would work on my local machine).
However when I click the button locally I get nothing. Then, when I upload the files to a different server (a "web host") suddenly it works.
So, this works on a webhost and it works at w3schools but it doesn't work locally on my machine in my root folder (where php works without a problem).
I would prefer to not have to upload my code before being able to test whether it works and would rather be able to process everything locally, like I do with PHP. Is it possible to do this locally or can I only make these requests remotely from my web host?
Why is my machine not processing this code? Any help would be appreciated. Thanks.
There are a lot of reasons you might not be able to load the file locally, but most will have to do with how you're serving the files. If you're using file:// you're going to run into problems; you said you have an Apache server, but didn't mention whether you were actually serving this site from it.
Have you checked to make sure that the route you're loading via your AJAX call is actually loading properly? E.g. if the ajax file is at your web root (http://local.site/ajax.html) and so is your txt file (http://local.site/demo_test.txt).
In this situation you can also always check your browser's Javascript console to see if you get any errors or if the files are actually loaded correctly. Depending on how you're serving and accessing the various files, you might be getting CORS errors as well.
The simplest solution is to make sure you're running on a local webserver (your Apache) instead of directly viewing files.

javascript not working on localhost

Ok so I'm lost here, frustrated and pulling my hair and out. Plus probably about to be fired or take a pay cut.
I moved Files from a development server to my local machine. The files are consistent (used diff tool), all the dependencies are there. It works for the most part. The problem is that the some of the javascript (not all) is just not working. We're using jquery and a lot of plugins for it. I've checked with the web developer plugin in firefox and all the js files are loading. I cleared the cache in both firefox and chrome multiple times to no avail. The development server is a windows server running wamp. My local machine is running ubuntu. Somebody tell me what I missed.
Download firebug as a Firefox extension and view the http request and responses.
Easiest may be from within the 'net' tab to determine if your script is making a request.
Very likely that it is a source domain issue. There are no work-around for this issue. The ajax request and the source data must be on the same domain.
It may have something to do with JavaScript's security limitations. (In certain circumstances) You can only operate on URLs or pages from the current domain, which most likely changed when you moved the files off the other server. More here.
Are you running the files via a webserver, or just opening the files directly? If it's the latter, you'll want to set up a server on your local machine for local testing, and serve the files using it. Otherwise, you'll very likely run into the domain restrictions others have mentioned above.
You may need to host the site using a local server. VS IDE has an add-on called live server. You need to set up a workspace in order for it to work. The port used on my machine was 5500.
You need to make sure any dependencies for javascript are running on your server or the javascript will not be executed. These dependencies are listed in the json file.
ex. If you require express, you need to be running node or the javascript won't execute in your web browser.
In the terminal:
node app.js
Any dependencies that are not installed and running on the server will not execute.
Are you accessing the html web pages through the webserver and not simply double clicking the file to open it?
Also if you have WebDeveloper toolbar installed the click "Disable", "Disable Javascript" and make sure "All Javascript" isn't ticked.

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