I am in a scenario like this:
We have two similar popup windows, and such popup windows are generated by a factory (in Javascript) so that they share same common events & functions. One of them is our custom resize function named resizeFormRowService. It will get called when the browser window fires the resize event.
As the popup window is in a structure like repeating
<div class="row">
<div> //label </div>
<div> //data </div>
</div>
The resizeFormRowService first get the width of the parent div with class row, then set it's first div child (which is label) to a fixed width like 140px, and set second div's width to "parent - first child". All are done by JQuery (as shown below)
I found that there is a strange behavior on one of the popup in Chrome (I am comparing two similar popup windows as stated).
The calculated width of the second child div (which is data) is 5px more than the other popup's corresponding field. So I log something in resizeFormRowService to trace what's going on.
StandardTemplatePopup.prototype.resizeFormRowService = function () {
var self = this;
var $popUp = self.getPopup();
...
var $rows = $popUp.find('.row');
$rows.each(function () {
var $this = $(this);
var $firstDiv = $this.find('div:first');
var $secondDiv = $this.find('div:eq(1)');
var labelColWidth = self.options('labelColWidth');
// labelColWidth is something we can config, so both popup firstDiv's width is the same
// so I think the problem must be in $this.width()
$firstDiv.width(labelColWidth);
//Add by me, want to see which row is this
console.log($this);
//Add by me, see this row's width
console.log($this.width());
var width = $this.width() - $firstDiv.outerWidth() - 0.5;
$secondDiv.width(width);
});
...
};
Running this on both popup windows, one log 270px while the other one log 265px! So I try to see which rows are they, at this point I think maybe there is some scripts within the first popup window changing the row's margin / padding and thus changing its width, but surprisingly it's not the case
Here is first popup
Here is the second popup
As shown, the second child div's calculated width differ by 5px, but the parent's row width is exactly the same, which is contradicting what I logged in the resizeFormRowService!
So my question is: are there any known issues of JQuery width() which lead to my problem? If no, then any advice pointing to potential cause is appreciated.
EDITED:
I hope this may hint someone, one of my teammates, by trial & error, adding an empty div at the end of the first popup window
<div class="col-xs-12"> </div>
Then everything goes fine...both popup windows will resize correctly.
PS1: The smaller result: 265px is the correct and expected result
PS2: The height difference in the images is due to the wrongly calculated width of the second child div which makes content too wide to show in one line, so the height is auto-increased
I'm just going to put this in an answer because comments aren't very insightful.
To me, it would seem that your calculations are too fast and don't keep to any pre-set values. Something like say, a CSS transition would 100% surely mess it up for you. I personally would code it more like this (being a front-ender myself)
$rows.each(function () {
var $this= $(this);
var $firstDiv = $('div:first', $this);
var $secondDiv = $('div:eq(1)', $this);
var labelColWidth = self.options('labelColWidth');
// labelColWidth is something we can config, so both popup firstDiv's width is the same
// so I think the problem must be in $this.width()
$firstDiv.width(labelColWidth);
//Add by me, want to see which row is this
console.log($this);
//Add by me, see this row's width
console.log($this.width());
//why recalculate the $firstDiv.width when you have labelColWidth?
//try to avoid simple names like "width" for prevention of double naming
var newWidth = $this.width() - labelColWidth - 0.5;
$secondDiv.width(newWidth);
});
-- I should mention, Selectors like div:first and div:eq(1) tend to break when you insert things like : after or : before. I would recommend you use classes instead.
Related
http://dev.clickymedia.co.uk/rdicoursefinder/course-finder/
If you view the link, you will see that there are a number of filters acting at the same time. The overall height of the box is adjusted dependant on the amount of items showing by the filter plugin.
We then have a popup box when you click on each item. This also has a varying height, and pushes the next items down. We need the height of the container to adjust, taking into account the original height of the container before the item is clicked, and the popup box's height.
I have written some jQuery to do this, however, as you will see, each time it is adding the height of the blue popup box to the overall height again and again when you click the item to show the box, instead of once one is showing, adjusting the height of the container accordingly.
The jQuery I have used for the height is below:
var originalHeight = $('#filter-results').height();
var thisHeight = 70 + $('.resultsShowing').height();
var overallHeight = originalHeight + thisHeight;
$('#filter-results').height(overallHeight);
Any help would be much appreciated!
This line
var originalHeight = $('#filter-results').height();
will need to be outside your click() event, and should be done only once on $(document).ready()
This is because you're using the new height every time you're generating more height.
You need to move the originalHeight to one specific point, the first time you need it, and leave it alone there. Then, only thisHeight needs to get updated, and the result height should bet the former (static) + the latter (dynamic).
Remove this first of all
window.setInterval(function(){
///etc
}), 1);
It's killing my machine in Chrome.
if you want to know the blue element height before you display it, you should create it in memory:
var blueBox = $('<div />').html( ... );
var height = blueBox.height();
now you can add this height to the overall container and display blue element:
blueBox.appendTo('.overall');
ps. sorry about pseudo code
Here's a couple of ways to ask this question:
How can I get the height (in pixels) at which the page will start having scroll bars? In other words, how do i get the window height at which a scroll bar will appear?
How can I get the maximum height of all elements on the page that don't have relative
heights (e.g. height: 100%)?
This question is related, but the answer doesn't do what I want in the case of relative heights: Finding the full height of the content of a page/document that can have absolutely positioned elements
I made a js fiddle of what I'm talking about: http://tinyurl.com/kgf8dae . Unfortunately, jsfiddle seems to break the relative height put on div e - run it as an html page in a normal browser to see the real behavior.
I might be misunderstand the question. In general, if the window height is less than the document height you will get a vertical scrollbar.
So in jQuery the check might look like this:
if( $(document).height() > $(window).height() ){ /* There will be a scrollbar */ }
You can perform this check within DOM changing and window resizing events to ascertain if a scrollbar has appeared. To preemptively determine if an event would cause a scrollbar to appear can be tricky and would likely require some understanding of the page and potential events to handle efficiently.
This is tagged through jQuery so I'm going to use jQuery; even though it's not mentioned in the question body.
a) It sounds like you want to get the height of the viewport (window); which can be retrieved like this:
var height = $(window).height();
If the height of the document (page) exceeds the height of the window, and there are no CSS properties blocking the display of scrollbars, then scrollbars will indeed by visible.
if( $(document).height() > $(window).height() )
b) This is going to be a bit trickier, in the sense the only way off the top of my head is to query every DOM element.. this is not a elegant solution; and in fact I'd ask you to reconsider your approach if you really you must do this. That said.. for curiosity...
If you're looking for the max height, in the sense of the largest element - then this would work:
// Get height of largest element.
var max_height = 0;
$('*').each( function(){
// skip <html> and <body>
if( ( $(this).get(0) == $('body').get(0) ) || ( $(this).get(0) == $('html').get(0) ) )
return;
var current_height = $(this).height();
if( current_height > max_height )
max_height = current_height;
});
For example, running that on this page...
> console.log( max_height );
570
However, I'm not sure if you want the maximum height of all combined elements.. In which case we obviously need to add all the elements up, but there's the obvious problem: elements are nested!
If this is what you want, then by using .children() we can just iterate through the lengths of the elements that are immediate children of your containing element/body.
// Get height of all combined elements
var combined_height = 0;
$('body').each( function(){ // replace with containing element?
combined_height = combined_height + jQuery(this).height();
});
For example, running that on this page:
> console.log(combined_height);
2176
Using the HTML/CSS from the example your provided via (jsfiddle.net/RMe3n/1). The answer is and always will be 242.
However, I assume you're looking for a more dynamic approach. Running the following after DOM ready will also produce 242:
var answer = 0;
$('#absolutes > div').each(function(){
var h = $(this).outerHeight(true);
if(answer < h) answer = h;
})
alert(answer);
While the above will solve for the particular HTML/CSS you provided it makes a lot of assumptions about the page's HTML structure and CSS.
Is it possible that the problem you are attempting to address with JS could be resolved in a "cleaner" way by adjusting the HTML/CSS of your page?
If you are looking for a fool proof JS method to account for ALL the multitude of unique layouts/styles that exist now and may exist as more CSS3 display types are adopted in the future I believe you're out of luck. There is no recommendable, consistent, efficient way to do so.
Note: If this is more than just a theoretical discussion, consider being more specific about the exact scenario you are faced with as there is likely a vastly different approach that may resolve the issue.
Is there any way to know if an element is visible on an html page?
Like this:
One can probably do it considering the horizontal/vertical scrolling positions, the width/height of the browser window and the position/size of the element on the page, but I have little experience in jQuery so I don't know how to do it. And there might be a simple function one can call, I don't know.
You can use the .is(':visible') selectors to check if an element is currently visible in the DOM.
Edit:
However, as #BenM mentioned, this doesn't check if the elements on your page are actually out of your scrollable range - a great little plugin you could use in that case would be Viewport Selectors for jQuery.
Here is some code that I use to do this. It has been tested to work great.
function isVisible($obj) {
var top = $(window).scrollTop();
var bottom = top + $(window).height();
var objTop = $obj.offset().top;
var objBottom = objTop + $obj.height();
if(objTop < bottom && objBottom > top) {
//some part of $obj is visible on the screen.
//does not consider left/right, only vertical.
}
}
I would like to scroll horizontally the given element. The only way I find is using ScrollIntoView DOM method, which allows either align the element's bottom with the view bottom or the top - with the view top.
But what if the element is OK with respect to the Y axis, and I only want to scroll it horizontally? How can I align its left with the view left or its right with the view right?
EDIT
Here is more context. I have a YUI table with a horizontal scrollbar. I wish to scroll it programmatically to a certain TD node. I do not think window.scrollTo is of any help to me, since the scrollbar is on a div element, not on the whole page.
EDIT2
Turns out there is a duplicate SO question with the right answer - How can I scroll programmatically a div with its own scrollbars?
Voting to close mine.
I've recently had a problem with a table header that had inputs as filters for each column. Tabbing through the filters would move the focus, but if one of the inputs wasn't visible or if it was partly visible, it would only JUST bring the input into view, and I was asked to bring the full input and column into view. And then I was asked to do the same if tabbing backwards to the left.
This link helped to get me started: http://www.webdeveloper.com/forum/showthread.php?197612-scrollIntoView-horizontal
The short answer is that you want to use:
document.getElementById('myElement').scrollLeft = 50;
or:
$('#myElement')[0].scrollLeft = 50;
Here's my solution (which may be overkill for this question, but maybe it'll help someone):
// I used $.on() because the table was re-created every time the data was refreshed
// #tableWrapper is the div that limits the size of the viewable table
// don't ask me why I had to move the head head AND the body, they were in 2 different tables & divs, I didn't make the page
$('#someParentDiv').on('focus', '#tableWrapper input', function () {
var tableWidth = $('#tableWrapper')[0].offsetWidth;
var cellOffset = $(this).parent()[0].offsetLeft;
var cellWidth = $(this).parent()[0].offsetWidth;
var cellTotalOffset = cellOffset + cellWidth;
// if cell is cut off on the right
if (cellTotalOffset > tableWidth) {
var difference = cellTotalOffset - tableWidth;
$('#tableWrapper').find('.dataTables_scrollHead')[0].scrollLeft = difference;
$('#tableWrapper').find('.dataTables_scrollBody')[0].scrollLeft = difference;
}
// if cell is cut off on the left
else if ($('#tableWrapper').find('.dataTables_scrollHead')[0].scrollLeft > cellOffset) {
$('#tableWrapper').find('.dataTables_scrollHead')[0].scrollLeft = cellOffset;
$('#tableWrapper').find('.dataTables_scrollBody')[0].scrollLeft = cellOffset;
}
});
This is something I used a while back. There might be better and more efficient way of doing it but this gets the work done:
$(".item").click(function(event){
event.preventDefault();
// I broke it down into variable to make it easier to read
var tgt_full = this.href,
parts = tgt_full.split("#"),
tgt_clean = parts[1],
tgt_offset = $("#"+tgt_clean).offset(),
tgt_left = tgt_offset.left;
$('html, body').animate({scrollLeft:tgt_left}, 1000, "easeInOutExpo");
})
You just need to make sure that the item is an a tag with an href that corresponds to the target id element:
HTML:
go to section 1
...
<section id="one"> Section 1</section>
Hope this helps!
How do I go about getting what the height of an element on a page would be if it ignored the 'height' css property applied to it?
The site I'm working on is http://www.wncba.co.uk/results and the actual script I've got so far is:
jQuery(document).ready(function($) {
document.origContentHeight = $("#auto-resize").outerHeight(true);
refreshContentSize(); //run initially
$(window).resize(function() { //run whenever window size changes
refreshContentSize();
});
});
function refreshContentSize()
{
var startPos = $("#auto-resize").position();
var topHeight = startPos.top;
var footerHeight = $("#footer").outerHeight(true);
var viewportHeight = $(window).height();
var spaceForContent = viewportHeight - footerHeight - topHeight;
if (spaceForContent <= document.origContentHeight)
{
var newHeight = document.origContentHeight;
}
else
{
var newHeight = spaceForContent;
}
$("#auto-resize").css('height', newHeight);
return;
}
[ http://www.wncba.co.uk/results/javascript/fill-page.js ]
What I'm trying to do is get the main page content to stretch to fill the window so that the green lines always flow all the way down the page and the 'Valid HTML5' and 'Designed By' messages are never above the bottom of the window. I don't want the footer to stick to the bottom. I just want it to stay there instead of moving up the page if there's not enough content to fill above to fill it. It also must adapt itself accordingly if the browser window size changes.
The script I've got so far works but there's a small issue that I want to fix with it. At the moment if the content on the page changes dynamically (resulting in the page becoming longer or shorter) the script won't detect this. The variable document.origContentHeight will remain set as the old height.
Is there a way of detecting the height of an element (e.g. #auto-resize in the example) and whether or not it has changed ignoring the height that has been set for it in css? I would then use this to update the variable document.origContentHeight and re-run the script.
Thanks.
I don't think there is a way to detect when an element size changed except using a plugin,
$(element).resize(function() //only works when element = window
but why don't you call refreshContentSize function on page changes dynamically?
Look at this jsFiddle DEMO, you will understand what I mean.
Or you can use Jquery-resize-plugin.
I've got it working. I had to rethink it a bit. The solution is on the live site.
The one think I'd like to change if possible is the
setInterval('refreshContentSize()', 500); // in case content size changes
Is there a way of detecting that the table row has changed size without chacking every 500ms. I tried (#content).resize(function() but couldn't to get it to work.