I have this JQuery code working however I need to know whether how to actually get the URL executed from the tags selected.
$("link, script, style, a, img").each(function () {
$(this).load(function () {
// get the URL and log it
console.log("Intercepted HTTP Event");
});
});
First thing I need to do it to get the actual URL during the load.
Next thing I may need to do is to actually catch before the load event happens, I mean before an image or link is loaded for example. Also, I need to modify the URL of the event that will be executed, for example, img tag has src="/somewhere/image.png" I mean, this will cause a GET /somewhere/image.png I may need to change it to GET/otherplace/image.png
Any ideas how to achive any of these?
$(this).load() will fire after the contents of the element have been loaded. So you may be able to grab the URL by doing $(this).attr("src") or $(this).attr("href"), but it's already too late to stop the HTTP requests from going out.
AFAIK, with modern browsers, there's no way for JavaScript to prevent assets from being loaded in the first place. At best, you may be able to change images and stylesheets after the page has been loaded, by changing the src attributes. If you do this, make sure that $(this).load() doesn't go into an infinite loop. (<a> links are less of a problem. Nothing is loaded, so just change the href attribute.)
.attr('src')
http://api.jquery.com/attr/
One way to approach this problem would be to have some dummy links/hidden controls with the source of your external resource and once the page loads you go through all such controls and then create the respective html elements, update the src attribute and then append it to the dom.
Dummy Controls:
<input type="hidden" source="/my/source/a.jpg" nodeType="img" class="specialControls"/>
<input type="hidden" source="/my/source/1.js" nodeType="script" class="specialControls" />
and the javascript
$(document).ready(function()
{
$(".specialControls").each(function(){
var elementType=$(this).attr("nodeType");
$('<'+elementType+'/>').attr('src', $(this).attr("source"))
.insertAfter($(this))
});
});
Hope this helps.
Related
I'm looking for a way to load a website and then check after 1 min or so whether the content has changed, if not, repeat. This is because the website I'm trying to get content from contains javascript for loading the div I need. I thought of using some kind of iFrame, but I have no idea where to start and Google isn't helping me.
Edit
This is the code I'm running with atm and scrapUrl is a defined url so don't worry about it:
var iframe = document.body.appendChild(document.createElement('iframe'));
iframe.src = scrapUrl;
$(iframe).ready(function() {
$(iframe).load(function() {
alert('loaded');
alert($(iframe).contents().find('div#description').html());
});
});
It outputs "loaded" and after that "undefined"
So you're doing a lazy load of content in a div, and you want to know when that div has loaded? Depending how you're doing it, you'd be better to set a flag and react to the AJAX "load" event associated with that lazy load.
If you must do it the way you suggest, try this:
Create an interval (setInterval) that checks the load status, or the contents of the div
if false, do nothing. If true, clearInterval.
I have a below anchor as below
<a onclick="return getFile('/log/sample.log');" href="/log/sample.log" target="_blank"> sample.log </a>
Because at my server, the log directory in href may be not correct. So the function "getFile" would change the href to the correct one after asking the server.
The first click always failed since the link was not correct, then after AJAX process in getFile was finished and the correct href was given, the clicks later on was ok.
The problem is how I forcefully let html wait ever at the first click until the href is changed, then do the query on the server.
Thanks in advance.
I guess my current way could be not in the correct direction by using "onclick" to implement the idea.
You want something like this
$(function() {
//assume you tagged all anchors you want to do this for with class=adjustlink
$('a.adjustlink').click(function(e) {
var thisAnchor = $(this); //save reference for later use
//this will either be true (see below) or undefined (falsy)
if(thisAnchor.data('myapp.linkHasBeenTested')) {
return; //continue on
}
// Stop the link from being navigated (the default for this event)
e.preventDefault();
//I'm assuming this is fetched as text but could just as well be JSON or anything else
$.get('/LinkAdjustment/', thisAnchor.attr('href')).done(function(result) {
thisAnchor.attr('href', result); //set the href
thisAnchor.data('myapp.linkHasBeenTested', true);
thisAnchor.trigger('click');
});
});
});
As an interesting side-note. You might be attempting to do something similar to the way REST is intended to be done. You might consider, first fetching a resource that will tell you up-front what the correct links are.
I would recomend setting the href to # initially. And in your getFile, set the href to the correct value and then programatically click the 'a' on success of your ajax
You will need to find the element to do this. It can either be done by setting an id and then using document.getElementById(), or would be easier to do do this using Jquery selectors, and it even has a .click() you can call after.
If you want persist with this flow make your ajax call synchronous, it will forcibly wait.
But this flow is not suggested, I would have rather updated these hrefs on page load or would have set a default url to my server page, which would then redirect to right log file
Can anyone help with this please?
I have a webpage with an asp.net frame on it- the frame shows the contents of an html document.
When someone clicks on a link in the html document, I need to show some content in another frame on the same page.
So, the question is, what should 'myTag' be in the following...
e.g.
//this is the contents of my html file`
<p>to be or not to be, <myTag>that</myTag> is the question</p>
Whatever 'myTag' is (maybe a piece of javascript? don't know), it should be able to fire an event on the server so I can send some more text to the other frame on the page
Any ideas?
thanks..
The first thing I would do is give the other frame an ID or some way to easily get to it with javascript. Then inside your iframe, you could do something like:
var other_frame_document = window.parent.document.getElementById('other_frame').contentWindow.document;
// example 1: set the HTML of the other frame from a string.
// this is usually a bad idea because of XSS.
other_frame_document.body.innerHTML = '<b>aloha</b>';
// example 2: better way is to manipulate the DOM in the other iframe
var elm = other_frame_document.createElement('b');
elm.appendChild(other_frame_document.createTextNode('aloha'));
other_frame_document.body.appendChild(elm);
that is one way to fire an action.
Or you can bind the action using jQuery (or some other library) when the DOM loads, like this:
jQuery("#myTagId").bind("click", function() { ... });
This will cause the event to fire when the element is clicked.
You can then use ajax to call the server to update the other frame.
I know there is many of possiblites when it comes to check if an iFrame content has been loaded. Although, is there anyway to limit it?
Example, if I have an iframe, and I need to check if everything has loaded, I can use the load() function. Although, if I click a NEW link inside the iframe, it will run the load() function again.
What I wish to know, is there any way to do, so jquery only checks the FIRST time the iFrame content has been loaded?
I have tried everything, nothing works.
Use jquery .one, it does the unbind work for you.
$('#iframe').one('load', function() {
});
Example fiddle.
You can unset the load callback again once it gets called.
$('#iframe').load(function() {
// do things which are awesome
$('#iframe').unbind('load');
});
I'm changing the image src of an image node.
I want to be able to make sure that it's changed before executing somecode. How would i do that?
right now i have
function changePic(imgNode, newPic, desc){
var descNode = $("#description");
$(imgnode).fadeTo(500, 0, function(){
$(imgnode).attr("src", newPic);
$(imgnode).attr("alt", desc)
descNode.text(desc);
$(imgnode).fadeTo(500, 1);
});
}
Works great if the server's fast/ a local server. Works terribly if the server's slow, where the image will fade back in before changing...
any idea?
Edit: I'm loading the image when changePic is called. Any better ways to do it?
More: Also why is it not a good idea to put the last line,
$(imgnode).fadeTo(500, 1);
, outside of the callback function?
Preload the image, but to be sure it's completely loaded, use the .load() event.
Quote:
The load event is sent to an element
when it and all sub-elements have been
completely loaded. This event can be
sent to any element associated with a
URL: images, scripts, frames, iframes,
and the window object.
And don't miss this line:
It is possible that the load event
will not be triggered if the image is
loaded from the browser cache. To
account for this possibility, we can
use a special load event that fires
immediately if the image is ready.
event.special.load is currently
available as a plugin.
I put together an example of how I think you want it to work. I switch between three images I found through Google Images. I bind the load event before I change the src of the image to be sure it's triggered.
http://jsfiddle.net/xdjjR/1/
I guess, you can preload image in hidden elements, so that it's loaded with other html. When the source changed such image should be shown immediately.
Use the callback param
doc
ex from doc:
$('#clickme').click(function() {
$('#book').fadeOut('slow', function() {
// Animation complete.
});
});