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.
Related
I need to generate a PDF from the current screen in my webapp. Some kind of screenshot, but I'm facing serious difficulties.
The main problem is that the view contains a grid made with jQuery Gridster; and some "widgets" contain complex elements like tables, highcharts, etc.
So plugins like jsPDF or html2canvas can't render my page in a prorper PDF. They always generate it blank.
This is how the page looks like. You can/move resize each element:
(Sorry for the CIA style, but there's business data in there)
Some ideas I came across but don't work are:
Using browser print-to-pdf feature programatically. (can't)
Use phantomjs. (but page state matters, so...)
I believe a solution to this poroblem may be widely adopted by anyone trying to generate a PDF of img from current screen in a web app. Quite an unresolved problem.
It's ok if only works on Google Chrome.
Many thanks.
EDIT:
One posible solution might be to find a way to represent the current layout status with an object and save it with and id.
Then retrieve that object via url param with the id and apply the stored layout to the inital page.
This way I might able to take a screenshot with phatomjs, but it seems quite complex to me. Any alternative?
Based on the fact that you're struggling with capturing dynamic content, I think at this point you need to take a step back and see that you might need to alter your approach. The reason these plugins are failing is because they will only work with the HTML before interactions right?
Why not convert the HTML to .pdf format from the server side? But the key part here is, send the current HTML back. By sending it back, you're sending updated static HTML back to the server to be rendered into a PDF? I've used HTML to PDF from server side before and it works fine, so I can't see why it wouldn't be appropriate here.
See this answer for details about HTML to PDF server side.
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 came across a js library (jsMovie) and wanted to see the example files, but it is really badly documented (usage), so i tried to download the authors page to look in the source-code. But when trying to do that, I've recognized that "view-source" wasn't giving the full code (almost 80% of the code did not appear). (Tried in Chrome, Firefox)
So my question is, how can this be? Firebug is displaying everything propperly. At this moment i thought, that this could be as well a good way to prevent kiddies from ripping sites.
here the page: http://konsultaner.de/entwickler#Konsultaner
Hints are welcome
Generate the current source code, as interpreted by the browser. This can be done using an XMLSerializer on document.
var generatedSource = new XMLSerializer().serializeToString(document);
From there, if you want to open a page just showing the source, you could do
window.open('data:text/plain,'+encodeURIComponent(generatedSource), '_blank');
They are using AngularJS, a front-end javascript framework. That means almost all parts of the page are generated dynamically using javascript. Therefore, you can't see the page without javascript running (using view-source), but you can see the generated HTML via inspector.
If it is a static website (the javascripts and templates are all there), you can still 'rip' it. But not if it is a dynamic website, since all data and logic are 'fed' by the server.
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 :)
I believe that this question has been asked in a few different forms, but I've read quite a few different responses.
At first, I had a web-application written with mostly jQuery that would make use of servlets to retrieve information from various locations JavaScript could not access (ie. Feeds, images from a server, etc.). Now, however, I've been told to do away with the servlets and application configuration classes so that this project of mine contains only HTML, CSS, and JavaScript/jQuery. Rather than pulling the images off of the server, I need to retrieve them from a local file on the computer. I know that allowing this might seem like terrible design, but it's what I've been asked to do. At any rate, what I really need to do is count the number of image files in a directory and then perhaps compile an array of the filenames themselves. I could do this fine in Java when using the servlets, but without them, I'm not sure how or even if this can be done.
I'm basically trying to use the jQuery Cycle plug-in to cycle through these images like a slideshow. I inject (or $("#div").append()) these images into the div by using a loop based on the number of images present.
So, is there a way I can do this with using JavaScript, HTML, jQuery plug-in, etc? I'd like to avoid using PHP and Java at this point...
You can't just read a directory with JavaScript; however, there appears to be a way to "exploit" how browsers function using http://www.irt.org/articles/js014/. It may not be pretty, but the demo works in the latest Chrome and IE7-9 for me. I'm sure some of the techniques could be updated to use cleaner code if you'd like to improve upon it.
EDIT:
Another technique you could use can be found in Javascript read files in folder
It definitely looks to be a cleaner solution. What I'd recommend is extracting the body contents to inject into a hidden div or using the path for an iframe that you can read from.