Resize a dynamically generated iframe - javascript

I have a report generated by Oracle Apex (A UI tool operating against the Oracle database). I have customized it to have a hyperlink on each record, which when clicked opens a detail report in an iframe right under the current record. This, I am doing by using the Javascript insertRow method on the html table element (Condensed Javascript code below. Oracle APEX allows use of JS/Jquery)
var pTable= html_CascadeUpTill(t,'TABLE');
var myNewRow = pTable.insertRow(pTR.rowIndex+1);
var myNewCell = myNewRow.insertCell(0);
myNewCell.innerHTML = '<iframe src="detail report url" height="0"></iframe>';
In order to resize the height of the iFrame that is different for different detail records, I have the following code in the document).ready(function() of the page
$('iframe').load(function()
{
setTimeout(iResize, 1000);
}
function iResize()
{
// Iterate through all iframes in the page.
for (var i = 0, j = iFrames.length; i < j; i++)
{
var y=(iFrames[i].contentWindow || iFrames[i].contentDocument);
if (y.document)y=y.document;
var docHt = getDocHeight(y);
if (docHt) iFrames[i].height = docHt + "px";
}
}
);
Without the setTimeout call to iResize function, the iframe resize is not happening. But this setTimeout is adding a delay in the resized iframe to appear which I want to avoid. Is there a way to do this? All the related posts/articles I have seen online deal with iframes that are built into the page but not generated on-the-fly as in my case.
Let me know if you need more information. Please help. Thank you.

You should consider putting the details in a <div> block, then showing or hiding the <div> with JQuery. You can set dimensions for your block with CSS, or just let the content flow normally inside of the block. Sounds like a much simpler way to achieve the same effect.

The issue is that if you perform the resize too soon it will get the dimensions of the child document before it has been fully rendered, hence the use of a timer.
If your detail reports are other APEX pages that you control, then you could call the iResize function from the "Execute when page loads" section of the detail page:
parent.iResize();
That seems to work for me.

It sounds to me like the iframes don't even exist when the page first loads.
Instead of calling the iResize function on page load and then every second you could place the call to iResize in the code that creates the iframe.

Related

How can I resize the iframe without page refresh?

I have some swf embedded in iframe but only if the page is refreshed the iframe is resized, then if I select other one then will show as all swf not only the animation the background as well. This is what I am using
if ( 'resizeIframe' === $('#onPlayAction').val() ) {
var ifrEl = $('div.player-container iframe.page-iframe')[0];
$(ifrEl).show();
ifrEl.src = htmlPageBrowserUri;
ifrEl.onload = function() {
ifrEl.width = ifrEl.contentWindow.document.body.scrollWidth;
ifrEl.height = ifrEl.contentWindow.document.body.scrollHeight;
}
}
There are three ways to do this.
You can change the size on every window resize
$(window).on('resize', function (){
ifrEl.width = ... ;
ifrEl.height = ... ;
})
You can use some jQuery plugins like iFrame Resizer
You can use some nifty css tricks. Go search for responsive iframes using css and you will find a ton of good answers.
I hope this all helps you.
I suspect the issue with your code might be thses two lines :
ifrEl.src = htmlPageBrowserUri;
ifrEl.onload = function() {
The problem being that the first line set s the frame address, but second line sets the onload event immediately, probably before the page has loaded ? So when the page does load, the line setting onload event has already run & so doens't get set.
I don't quite understand the text in your question (sorry!) but the code below successfully resizes an iframe - it's run 'onload' in the frame's page:
<body onload="setParent()">
In case it's relevant, the iframe itself has attributes:
<iframe id="neckfinishframe" style="width:100%;overflow-x:hidden" src=".. etc">
In my case I'm only concerned about height. Width is 100%.
In the iFrame page, this code runs from the onload event to amend the iframe height to be whatever the height of the page is, plus a bit. This is intended to avoid showing a set of scroll bars within the iframe.
function setParent() {
// runs onload in iframe page
// in my case I have to run it from the frame page because I need to know the page rendered height in order to set the iframe height
var f;
try {f = parent.getElementById("neckfinishframe")} catch (e) {};
if (f != null) f.style.height=(this.document.body.scrollHeight+30)+"px";
}
Note - I haven't tried this cross- browser but I know it works in IE.

How to make an iframe auto-resize along with the dynamic changes on its content?

I have this js code I searched on auto-resizing iframe height with its content. It does what the user who posted this says it does. However, I now have this problem with dynamic content within the iframe.
The js code I have works only with the regular content of the page but not when there are dynamic changes going on within. For example, displaying texts through ajax call.
I've tried searching for other solutions to this but others did not work as well as what this code can do.
I'm hoping that there's someone who could help me update the code to meet what I currently need. I'm not very familiar with jquery/javascript to do this on my own. Thank you in advance! :)
This is the JS code:
function setIframeHeight(iframeId) {
var ifDoc, ifRef = document.getElementById(iframeId);
try {
ifDoc = ifRef.contentWindow.document.documentElement;
} catch (e) {
try {
ifDoc = ifRef.contentDocument.documentElement;
} catch (ee) {}
}
if (ifDoc) {
ifRef.height = 1;
ifRef.height = ifDoc.scrollHeight;
/* For width resize, enable below. */
//ifRef.width = 1;
//ifRef.width = ifDoc.scrollWidth;
}
}
I found this other code which enables iframe adapting to its dynamic content but I do not know how to make the code above and this work together. Please help me.
var iframe = document.getElementById("ifr").contentWindow;
iframe.$(".toggle_div").bind("change", function () {
$("#ifr").css({
height: iframe.$("body").outerHeight()
});
});
To summarize, I need a code that autoresizes iframe with its content and will autoresize again if there are changes on the size of the content.
The problem is that your page doesn't have any trigger indicating to resize when the iframe body resizes.
There also (as far as I know) isn't anything built into javascript that lets you watch for changes in an elements height.
You have two options.
If you are the owner of the iframe content, you can put a script in that page which can call to it's parent window telling the parent to run your resize script, or you can run a function which checks for changes say every second or so.
For the first method, you can follow the answer from here Can events fired from an iframe be handled by elements in its parent?
Otherwise just do a
setTimeout(function(){
$("#ifr").css({
height: iframe.$("body").outerHeight()
});
},1000);
function adjustMyFrameHeight()
{
var frame = getElement("myFrame");
var frameDoc = getIFrameDocument("myFrame");
frame.height = frameDoc.body.offsetHeight;
}
call this method on your iframe onload event and replace mtFrame to your iframe Id

jQuery Image load error not being called after page load

Hello Stack Overflow community, recently, I've been working on a quick image display using jQuery. It has a list of possible images that can be picked and displayed at random. The issue is, after the page has finished loading, jQuery ceases to detect image load errors for if the image is invalid.
My current method of finding and fixing errors is as follows:
$('img').error(function() {
$(this).attr('src',getImgUrl());
});
This, in normal circumstances such as the page being loaded, picks a valid image, even if multiple invalid images are specified in a row. However, after the page is finished loading, if an invalid image is picked, and fails to load, this function is not even called. Strangely enough though, if I add an onerror attribute to all images, they are always called from the onerror no matter if the page was freshly loaded or not, so why is jQuery having this issue? Any help is appreciated, thanks.
UPDATE:
It also appears this is happening to other jQuery functions as well, such as click.
UPDATE:
It would appear to be an issue with jQuery recognizing new elements on a page, such as newly created images.
UPDATE for those asking getImageUrl:
function getImgUrl()
{
var text = (Math.round(Math.random() * 3)).toString();
var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
for(var i=0; i < 4; i++ )
text += possible.charAt(Math.floor(Math.random() * possible.length));
return '/' + text;
}
All this does is pick a random URL, which matches occasionally to an image on my web-server that has many many images.
It would appear that jQuery has issues recognizing new elements on the page, so the way I fixed this was instead of deleting and adding images to the page, I just edited the existing SRC of images when doing changes, which strangely enough, the jQuery error function responds perfectly to.
Here's the refresh function I ended up coming up with for all interested:
function refreshImages()
{
var images = 10;
for(var i = 0;i < images;i++)
{
var url = getImgUrl();
$('#thumb' + i).attr('src',url);
if(i == 0)
{
$('#fullimage').attr('src',url);
$('.thumb').css('border','2px solid white');
}
}
resize();
}

javascript to cancel image loading

I am looking for a way to cancel image loading using javascript. I've looked at other questions and hiding them is not enough. Also, the rest of the page must load (window.stop() is out of the question).
The page that is being loaded is not under my control, only one thing is guaranteed - the first <script> on the page is my javascript (lightweight - no jquery).
I have tried setting all img sources to nothing, that did not help since the dom is created after the page is parsed, and all browsers have the same behavior - the img is loaded once it is parsed.
Not possible with modern browsers. Even if you alter the src attribute of image tag with JavaScript browsers still insist on loading the images. I know this from developing the Lazy Load plugin.
The only way I can see to stop images loading is to not have an src attribute present in the image itself, and using a custom data-* attribute to hold the location of the image:
<img data-src="http://path.to/image.png" />
Obviously this doesn't gracefully degrade for those (admittedly rare) JavaScript disabled browsers, and therefore requires a noscript fall-back:
<img data-src="http://path.to/image.png" />
<noscript><img src="http://path.to/image.png" /></noscript>
And couple this with a simple function to load the images when you, or your users, are ready for them:
/* simple demo */
function imagePopulate(within, attr) {
within = within && within.nodeType == 1 ? within : document;
attr = attr || 'data-src';
var images = within.getElementsByTagName('img');
for (var i = 0, len = images.length; i < len; i++) {
if (images[i].parentNode.tagName.toLowerCase() !== 'noscript') {
images[i].src = images[i].getAttribute(attr);
}
}
}
document.getElementById('addImages').onclick = function(){
imagePopulate();
};
JS Fiddle demo.
I can't be sure for all browsers, but this seems to work in Chrome (in that there's no attempt, from looking at the network tab of the developer tools, to load the noscript-contained img).
It can be done with webworkers. See the following example:
https://github.com/NathanWalker/ng2-image-lazy-load.
Stopping a web worker cancels the image loading in browser
Recalling the onload event:
window.onload=function(){
imgs = document.getElementsByTagName('img');
for(i = 0; i < imgs.length(); i++){
imgs[i].src = '#';
}
};
If you want to only cancel the loading of the image , you can use sємsєм's solution
but i do not think it will work by using an window onload event .
You will probably need to provide a button to cancel the image load. Also i suggest, instead of setting the src attribute to "#" , you can remove the src attribute itself using
removeAttribute()
[Make sure you disable the cache while testing]
You need a proxy.
Your script can redirect to another server using something like
location.replace('http://yourserver.com/rewrite/php?url='+escape(this.href));
perhaps you tell us why you want to cancel image loading and whose site you are loading on so we can come up with a better solution
If there is nothing on the page other than images, you could try
document.write('<base href="http://yourserver.com/" />');
which will mess with all non-absolute src and hrefs on the page.
UPDATE Horrible hack but perhaps this almost pseudo code (I am off to bed) will do someting
document.write('<script src="jquery.js"></script><div id="myDiv"></div><!-'+'-');
$(function() {
$.get(location.href,function(data) {
$("#myDiv").html(data.replace(/src=/g,'xsrc='));
});
})
The closest you can get to what you maybe want is to have a quickly loaded placeholder image (ie. low resolution version of your image) and a hidden image (eg. {display:none}) in which the large image gets loaded but not displayed. Then in the onload event for the large image swap the images over (eg. display:block for the large image display:none for the smaller). I also use an array (with their url), to reuse any images that have already been opened.
BTW if you open an image in a new webpage when it gets closed then the image loading will be cancelled. So maybe you can do something similar in a webpage using an iframe to display the image.
To close the iframe and therefore unload the image, remove the frame from the DOM
(another advantage is that browsers spawn another process to deal with iframes, so the page won't lock up while the image loads)

Setting Focus to an iFrame in IE

There is a tree menu in my application and on click of the menu items, it loads a url in a iFrame. I like to set the focus in an element of the page loaded in the iFrame.
I'm using this code, and it works perfectly in all the browsers except IE:
var myIFrame = $("#iframeName");
myIFrame.focus();
myIFrame.contents().find('#inputName').focus();
I have tried all different options like using setTimeout, but no chance.
After the page loads, when I hit the tab key, it goes to the second input, which means it's been on the first input, but it doesn't show the cursor!
I am using ExtJS and the ManagedIFrame plugin.
Any help is appreciated.
You need to call the focus() method of the iframe's window object, not the iframe element. I'm no expert in either jQuery or ExtJS, so my example below uses neither.
function focusIframe(iframeEl) {
if (iframeEl.contentWindow) {
iframeEl.contentWindow.focus();
} else if (iframeEl.contentDocument && iframeEl.contentDocument.documentElement) {
// For old versions of Safari
iframeEl.contentDocument.documentElement.focus();
}
}
Is the iFrame visible onload, or shown later? The elements are created in different order which is the basis of the setTimeout approach. Did you try a high value wait time on a set timeout?
Try something like at least a half second to test...IE tends to do things in a different order, so a high timeout may be needed to get it not to fire until render/paint finishes:
$(function(){
setTimeout(function() {
var myIFrame = $("#iframeName");
myIFrame.focus();
myIFrame.contents().find('#inputName').focus();
}, 500);
});
Difficult to troubleshoot without a working example, but you might try hiding and showing the input as well, to force IE to redraw the element.
Something like:
var myIFrame = $("#iframeName");
myIFrame.focus();
myIFrame.contents().find('#inputName').hide();
var x = 1;
myIFrame.contents().find('#inputName').show().focus();
This might jolt IE into displaying the cursor.
I could get IE to focus an input field in an iframe with:
iframe.focus();
var input = iframe...
input.focus();
iframe.contentWindow.document.body.focus();
input.focus();

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