JavaScript - Is it possible to get height from div in separate page? - javascript

I'm wondering, is it possible to collect the height of a specific div container from a separate page with JavaScript? I'm using jQuery btw and I'm in need of comparing heights of div containers.
Edit: To clarify a bit more, I load content from a specific div in a separate page using jQuery. This content is faded into a different container with dynamic height. But in the small fraction of time before the content arrives, it shrinks down to it's min-height.
What I've done so far is collecting the height of the container before and after the load. But it only works after I've loaded content once. Because I don't have the height before it's been loaded the first time.

If the relationship between the pages is opener and [popup|child] window, then yes.
If not, you are going to run into a security wall. (unrelated pages should not have access to each other)
So, if the "other" page is a popup window that your page launched, or a child iframe that your page "launched", then yes.
I would use the jQuery .height() method to obtain the height, but how you get the object is up to you (depends on what attribute info you have etc.)
//get from popup
var otherDiv = popupWinRef.document.getElementbyId('id');
//get from iframe
var otherDiv = window.frames[frameIdOrIndex].document.getElementById('id');
alert($(otherDiv).height());

Well, you can't get it until AFTER it's loaded via jQuery. Then you need to make sure you're not having a conflict between two divs with the same ID.

From your comments it sounds like you are using ajax to load content from another page, you'll likely have the load div hidden... So I would position the loading div absolutely out of the viewport but not hidden. then get the height of your desired div but make sure you access it using the loading div and your desired div... something like this:
#divToLoadContent { position: absolute; left: -99999em; top: 0; } /* don't hide this div */
Script
var height = $('#divToLoadContent #myDesiredDiv').height();

Related

jQuery scrolling doesn't show up

I'm writting a dynamic page using jQuery and I have a problem. I'm for example adding to my html file div's using append() function like this:
$("body").append("<div id ='dd_"+i.toString()+"' class='diamond_div'></div>");
I will be creating different amount of that div's base on datebase so that's why I use this variable i to assign different id's for each div.
My problem is that even if I'm creating that div's in body and when I look at code they are in it, if I check body's height it is 0 (width is ok, something like 1200).
Main problem with that is when there are too many div's they are beyond screen but there is no scroll bar. It's something like div's aren't in body although in code they are in.
Could you propose me any solution for that? Or what am I doing wrong? My line of thought is that I'm using $(document).ready so html file is creating a page, but see empty body so height = 0 and all my div's are beyond body. What do you think about that?
Take care of positioning; position:fixed removes your divs from normal flow ->
Fixed positioned elements are removed from the normal flow. The
document and other elements behave like the fixed positioned element
does not exist.
as W3C says
An empty <div> does not have a height. Thus you could add as many as you want to the page and it will never get any longer. For the scroll-bar to appear you need to either set a height to the <div> with CSS like this:
.diamond_div{
height:100px;
}
Or add some content to the <div> so you would have something like this instead:
$("body").append("<div id ='dd_"+i.toString()+"' class='diamond_div'>hello</div>");
Then your <div> would have height and once there are enough on the page to go beyond the height of the browser, the scroll-bar will then appear.
Following on from your comments. Setting the position to "fixed" removes the element from the workflow and thus will not extend the length of the page in the normal way.

get the height of a another web page

I'm using the following code:
$("#galleries").load("letters/index.php");
$(function(){
$('#galleries').hide().fadeIn(1500);
});
everything works fine. My problem is, I got about 8 scripts like that, and whenever I switch the content of the div, it doesn't do that smoothly, first of all, it clears the DIV and let me see that for about 0.7 seconds, after that, it loads ALL of the content within a second, and it's really disturbing my eye.
I thought about a solution, that I will get the height of the page I wanna load, and then set the DIV height to that height, and then load the info. Will it work? because, the LOAD function removes everything from the div, will it remove the height property as well?
generally, this is what im trying to achieve:
//GET TARGET'S HEIGHT
//SET #galleries TO THAT HEIGHT
$("#galleries").load("letters/index.php");
$(function(){
$('#galleries').hide().fadeIn(1500);
});
I don't know how to get the target's height and set it. But anyways, will it work? or maybe someone has another solution for me?
Thanks in advance!
You aren't using the complete callback of load() which allows you to run code after content is loaded.
Try something like this:
$(function(){
/* hide first, then load*/
$('#galleries').hide().load("letters/index.php", function(){
/* new content now exists*/
$(this).slideDown()/* or fadeIn() or any other effect*/
});
});
SlideDown is not dependent on overall height so will smoothly move content below it down

Keeping height of div static with an ajax call that inserts html

I have an Ajax call that inserts a div with several p elements with text. The problem is whenever I click the button to make the Ajax get, the height of the whole container will change because I haven't set a static height (I have set a specific width though) for the container in my css stylesheet.
Whenever I click the button to load the Ajax info, there will be a brief instant where you can see the container gets really small because I'm just replacing the text in the container with other text. Is there a simple css solution for this?
You could consider using the CSS min-height property, which would prevent the container from shrinking to a size too short (http://www.w3schools.com/cssref/pr_dim_min-height.asp). For instance,
#myContainer {
min-height: 600px;
}
Use
min-height:400px;//Whatever height you want it to not get smaller than
height:400px;//Whatever height you want the div to be
so that it doesn't gets small and use
overflow:auto;
so that it doesn't get big instead becomes scrollable when more content received than expected. Using overflow:auto will only show the scrollbars when the content overflows. i.e, when needed.
In case you want the scrollbars no matter what use
overflow:scroll;//Scrollbars will appear by default, even if not needed.

How can I auto-scroll as content is added to a div?

I have a div of fixed dimensions into which some JavaScript functions will be placing text over time. When the amount of text exceeds the height of the box, a scrollbar appears thanks to overflow:scroll.
The new problem is that the view into the div stays at the same place as more content appears. What I mean to say is that it stays scrolled wherever it is as more content appears beneath, hidden unless you manually scroll down. I want to make it automatically scroll to the bottom as new content appears so that the user naturally sees what appeared most recently instead of what's oldest.
Ideas?
You can use scrollTop method after each text addition:
$("div").scrollTop($("div").children().height());
Use inner block to get the true height.
DEMO: http://jsfiddle.net/eyY5k/1/
I found this approach to work for my needs:
var realHeight = $("#history")[0].scrollHeight;
$("#history").scrollTop(realHeight);
Do note this uses jquery.

How change Height of iframe dynamicly when different pages loaded in it , by javascript

I want a JavaScript code that change iframe height as well as the iframe's content's height is changed.
I don't want to calculate the height just when the main page has loaded, the iframe content has some elements loaded with Ajax and changes without refreshing the whole page, therefore the height of content changes dynamically without reloading. I want some way to dynamically calculate the height of iframe's contents and change the height attribute of iframe itself.
Is it possible?
The code should look something like this:
function resizeFrame(f) {
f.style.height = f.contentWindow.document.body.scrollHeight + “px”;
}
You can find an example to this URL:
http://www.mattcutts.com/blog/iframe-height-scrollbar-example/

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