I want to add some external script to a webpage. This scripts are pluggins wich should only be able to acces and modify the part of the dom they are assign too. This scripts will be developed by eternals developers and I will not be able to control them all by hand.
I know I can easily handle this problems by creating an iframe for each pluggins to run in. Unfortunately this solution is really slow on mobile devices.
How can I sandbox this scrips without using an iframe? (I can also do some work server side)
Thanks a lot :)
Related
I need to make changes to an existing project that uses iFrames to dynamically load external html files. However, the html files are part of the same project, not external sites. If I'm not mistaken, iFrames are considered a terrible way of loading html content unless they are used to actually display external sites.
I have looked into web components but apparently, browser support is still spotty and unfortunately, I need to support IE9.
I know that the JQuery load() method can accomplish this but in my online research, that doesn't often come up as a proper way of loading external html in general and a proper replacement for iFrames in particular.
Is there a reason why JQuery shouldn't be used here and are there better and established ways of doing this? For example, I once saw a framework that dynamically built the interface out of separate "partials" but I don't remember which framework that was.
It depends on the HTML -
If it's built like a full page - then iFrames are actually a decent solution - Also, iframes with the same origin let you have full control over the content from the parent, while still protecting CSS and JS variables which is pretty convenient.
If not - jQuery.load() will do the trick, you can also do it manually ofc, but if you already have jQuery in your project, just use it.
The load() function is almost always the best way to go, if you are encountering a specific issue using that function maybe you can share it?
In webview, can you remove html elements from a live website before it loads to the user?
I've been looking at a bunch of stackoverflow questions regarding this, except I realized they were only locally hosted Web pages inside the app. None of their solutions worked for me.
Any help would be appreciated.
Read first about building apps in webview and how to use javascript in it. Then try to accomplish your goal using Javascript, because it cannot be done simply with webview on android. GL!
One easy way of doing that, will be to first make an http request to load the html data from the website. Then edit the data (remove whatever you don't like from it). Finally display it into the webview with loadData.
However this may not work as you expect, considering the css or javascript from the page you want to load may be in seperate files.
I'm developing a chrome plugin, similar to adblock and I'm trying to figure out how to get access to the resources being loaded on a particular page.
For example, if a page is loading an external javascript or an iframe that has some specific strings - I'd like to intercept it.
How can I see the source of these external resources? Can I use Javascript/JQuery for that or I need to use Webkit's functions?
Can you point me in the right direction please?
I just did a proof of concept/demo for a web app idea I had but that idea needs to be embedded on pages to work properly.
I'm now done with the development of the demo but now I have to tweak it so it works within a tag on any websites.
The question here is:
How do I achieve this without breaking up the main website's stylesheets and javascript?
It's a node.js/socket.io/angularjs/bootstrap based app for your information.
I basically have a small HTML file, a few css and js files and that's all. Any idea or suggestions?
If all you have is a script tag, and you want to inject UI/HTML/etc. into the host page, that means that an iframe approach may not be what you want (although you could possibly do a hybrid approach). So, there are a number of things that you'd need to do.
For one, I'd suggest you look into the general concept of a bookmarklet. While it's not exactly what you want, it's very similar. The problems of creating a bookmarklet will be very similar:
You'll need to isolate your JavaScript dependencies. For example, you can't load a version of a library that breaks the host page. jQuery for example, can be loaded without it taking over the $ symbol globally. But, not all libraries support that.
Any styles you use would also need to be carefully managed so as to not cause issues on the host page. You can load styles dynamically, but loading something like Bootstrap is likely going to cause problems on most pages that aren't using the exact same version you need.
You'll want your core Javascript file to load quickly and do as much async work as possible as to not affect the overall page load time (unless your functionality is necessary). You'll want to review content like this from Steve Souders.
You could load your UI via a web service or you could construct it locally.
If you don't want to use JSONP style requests, you'll need to investigate enabling CORS.
You could use an iframe and PostMessage to show some UI without needing to do complex wrapping/remapping of the various application dependencies that you have. PostMessage would allow you to send messages to tell the listening iFrame "what to do" at any given point, while the code that is running in the host page could move/manipulate the iframe into position. A number of popular embedded APIs have used this technique over the years. I think DropBox was using it for example.
I am tinkering around with jQuery and am finding it very useful and almost exciting.
As of now, I am referencing the jQuery script via Google's CDN and I store plugins I use locally in a static/scripts directory.
Naturally, each page has its own individual implementation of components that are required for the features it currently offers. I.E. the main page has the Twitter plugin whereas the login page has form validation logic and password strength metering. However, certain components (navigation bar) for example use the same script across multiple pages.
Admittedly so, I am not a fan of putting javascript code in the header of a page, but I rather prefer to have it in an external file (for caching, re-usability, and optimization purposes).
My question is, what is the preferred route for organizing the external files. I wanted to try and keep it to one javascript file for the entire site to reduce IO requests. However, I am not sure how to implement document ready functions on a conditional per page bases.
$(document).ready(function () { ... }
Is there some way to reference a page by some method (preferably id based and not a url conditional).
Thank you in advance for your time!
You should try REQUIRE JS.
This will allow you to load only those plugins the pages where you need them, and unload them again if they are not needed anymore.
Then again, it might be overkill. It really depends on the size of your project.
Paul Irish:
http://paulirish.com/2009/markup-based-unobtrusive-comprehensive-dom-ready-execution/
This will allow you to block your scripts by body class/ID and execute them automatically.
First you might want to use YUI Compressor or some other JS compressing tool. Then perhaps creating a resource file (resx) for your JavaScript is the way to go. Then just reference the resource within your code. This is the approach Telerik took for their RadControl ASP.NET AJAX control framework.