code manupulation does not work through javascript - javascript

Html containing simple div element with class container given some height. I want the height to be equal to window height through javascript.
<script >
var container = document.querySelector('.container');
var windowHeight = window.innerHeight;
container.style.height = windowHeight;
</script>
If I change the value with some random number it works but does not show an effect when putting 'windowHeight'.

windowHeight is a number, styles also require a unit.
Try adding px to your code:
container.style.height = windowHeight + 'px';
Working example:
var container = document.querySelector('.container');
var windowHeight = window.innerHeight;
container.style.height = windowHeight + 'px';
html,
body {
margin: 0;
padding: 0;
}
.container {
background-color: #500;
}
<div class='container'></div>
Notes:
If you want this to work after the page has been resized, you will need to listen for the resize event and rerun the code.
If all you need to do is fill the background with a colour, the normal method would be to use CSS, and apply height: 100vh (Which means 100% of the view-port's height) which would work regardless of page resizes.

Related

Adapt width of texture to its content

I need to adapt the width of a textarea (='#overlay') to its content. The minimum width should be 100px:
'input #overlay': function(e) {
var overlay = $('#overlay'),
element = document.getElementById('overlay'),
pos = overlay.position(),
width = 100;
if (element.scrollWidth > element.clientWidth) {
var diff = Math.ceil((element.scrollWidth - element.clientWidth)/20)*20,
left = pos.left - (diff/2);
width = element.scrollWidth + diff;
overlay.css({left: left, width: width});
}
This code works to expand the textarea if there is a long line. But it can't be used to make it smaller if you delete some characters of the line.
You have to set the minimum value before the if-part:
overlay.css({ width: 100 });
Then the height will always be adapted to the needed height.

Avoid right jump of elements with javascript and local variable when hiding vertical scrollbar

I would like to add left margin and right margin to the body to hide the width change when I hide the vertical scrollbar.
I have this code that finds the width of the vertical scrollbar:
var $outer = $('<div>').css({visibility: 'hidden', width: 100, overflow: 'scroll'}).appendTo('body'),
widthWithScroll = $('<div>').css({width: '100%'}).appendTo($outer).outerWidth();
$outer.remove();
var scrollbarwidth = 100 - widthWithScroll;
It gives the value "17" (in pixels) for IE11, Chrome 45, and Firefox 39 (desktop).
When I hide the vertical scrollbar, all elements, such as images, jump exactly 17 pixels to the right, which I want to hide.
I have tried:
document.body.style.marginRight = scrollbarwidth + "px";
$('body').css('margin-right', scrollbarwidth);
$(body).css("marginRight", scrollbarwidth + "px");
The last one might be faulty in some way, since other parts of the function stops working when it's enabled. The two others don't seem to work either, as I don't see any margin changes.
EDIT 1: For easier understanding of how I am going to use it, I wanted to mention that it's supposed to trigger on a on scroll function, like this:
var check1 = false;
$(document).bind('scroll', function() {
if(check1 === false && $(window).scrollTop() >= $('#divscrolltester').offset().top + $('#divscrolltester').outerHeight() - window.innerHeight) {
check1 = true;
unloadScrollBars();
disableScroll();
var $outer = $('<div>').css({visibility: 'hidden', width: 100, overflow: 'scroll'}).appendTo('body'),
widthWithScroll = $('<div>').css({width: '100%'}).appendTo($outer).outerWidth();
$outer.remove();
var scrollbarwidth = 100 - widthWithScroll;
//document.body.style.paddingRight = scrollbarwidth + "px"; Temporary disabled.
//$('body').css('padding-right', scrollbarwidth); Temporary disabled.
//$(body).css("marginRight", scrollbarwidth + "px"); Temporary disabled.
setTimeout(function() {
enableScroll();
reloadScrollBars();
//document.body.style.paddingLeft = scrollbarwidth + "px"; Temporary disabled.
//$('body').css('padding-left', scrollbarwidth); Temporary disabled.
//$(body).css("marginLeft", scrollbarwidth + "px"); Temporary disabled.
}, 500);
}
});
EDIT 2:
Here is a Fiddle to show most of the js, html and css: https://jsfiddle.net/tfnwj7dj/10/.
I haven't added the change of css through code yet, as I'm still trying to solve the issue. Also, the scrolling and scrollbar are supposed to be re-enabled in a second, but there seems to be an error in there somewhere, sorry.
EDIT 3:
For your information at this moment, these lines work:
document.body.style.paddingLeft = (scrollbarwidth) + "px";
$('body').css('padding-left', scrollbarwidth);
document.body.style.paddingRight = (scrollbarwidth) + "px";
$('body').css('padding-right', scrollbarwidth);
document.body.style.marginLeft = (scrollbarwidth) + "px";
$('body').css('margin-left', scrollbarwidth);
document.body.style.marginRight = (scrollbarwidth) + "px";
$('body').css('margin-right', scrollbarwidth);
Maybe you have enough information to solve it, if you have the same issue, but unfortunately, this wasn't enough for me. It might be important info to know that I have my content centered with a width / max-width of just 500px, and that I don't actually have a body class. Maybe on designs with width="100%", or elements with absolute positioning, the lines might be enough.
Both javascript and jquery solutions are welcomed.
EDIT 4:
I finally solved it for my own circumstances - feel free to read the answer below. It works for preventing elements to jump when hiding the vertical scrollbar, and with some tinkering, it could probably do for a body class, or other situations.
Is your scrollbarwidth integer? Try this
var scrollbarwidth = 100;
$('body').css('margin-right', scrollbarwidth);
Maybe you have wrong value at scrollbarwidth ? In my ff this code works.
I managed to solve it - I'd like to clarify that my css actually don't contain a body class, and that I just centered all elements with a width / max-width of 500px and margin-left/right auto.
For my and other, similar cases, here is the answer:
/* First 5 lines for finding the scrollbar width. */
var $outer = $('<div>').css({visibility: 'hidden', width: 100, overflow: 'scroll'}).appendTo('body'),
widthWithScroll = $('<div>').css({width: '100%'}).appendTo($outer).outerWidth();
$outer.remove();
var scrollbarwidth = 100 - widthWithScroll;
var scrollbarwidthadjustment = scrollbarwidth / 2; /* For centered elements, divide the scrollbar width by 2. */
var element = document.getElementById('element');
element.style.right = (scrollbarwidthadjustment) + "px";
And when you re-enable the vertical scrollbar, simply add:
element.style.right = "0px";
Also, the element must have a css position stated, otherwise it won't trigger. Here is an example of a css style that works:
.examplestyle {
color: white;
position: relative;
margin-left: auto;
margin-right: auto;
max-width: 100%;
display: block;
}
EDIT 1:
To prevent some unsightly css errors on mobile devices, add these lines:
/* ... */
var scrollbarwidthadjustment = scrollbarwidth / 2;
var windowWidth = $(window).width(); /* Get current window width on click/scroll etc. */
var window1 = windowWidth + scrollbarwidth; /* Window width + scrollbar width. */
var element = document.getElementById('element');
if(window1 >= widthofelement) {element.style.right = (scrollbarwidthadjustment) + "px";}
else {}
EDIT 2:
Fix for image resized smaller than its original size:
var offsetwidth = element.offsetWidth;
var widthadjustment = offsetwidth - scrollbarwidth; /* Get full width of image when scrollbar hidden, and then remove the scrollbar width. */
if(window1 < widthofelement && scrollbarwidth > 0) {
element.style.width = widthadjustment + "px";
element.style.right = (scrollbarwidthadjustment) + "px";
}
And then this code when showing the Y-scrollbar again:
if(window1 < widthofelement && scrollbarwidth > 0) {
element.style.width = "OriginalSizepx";
element.style.right = "0px";
}
If you want to use every edit that I have added, here is the full code:
/* First 5 lines for finding the scrollbar width. */
var $outer = $('<div>').css({visibility: 'hidden', width: 100, overflow: 'scroll'}).appendTo('body'),
widthWithScroll = $('<div>').css({width: '100%'}).appendTo($outer).outerWidth();
$outer.remove();
var scrollbarwidth = 100 - widthWithScroll;
var scrollbarwidthadjustment = scrollbarwidth / 2; /* For centered elements, divide the scrollbar width by 2. */
var element = document.getElementById('element'); /* Put element ID into a variable for easier use, and consecutive uses without re-identifying it. */
var window1 = windowWidth + scrollbarwidth; /* Window width + scrollbar width. */
var offsetwidth = element.offsetWidth; /* Get exact element size in current window. Shows shown dimensions when the window is resized. */
var widthadjustment = offsetwidth - scrollbarwidth; /* Get full width of image when scrollbar hidden, and then remove the scrollbar width. */
if(window1 >= widthofelement) {element.style.right = (scrollbarwidthadjustment) + "px";} /* If current window is equal to or greater than element width... */
if(window1 < widthofelement && scrollbarwidth > 0) { /* If current windows is smaller than the element width, and the window has a scrollbar greater than 0 pixels in width. */
element.style.width = widthadjustment + "px";
element.style.right = (scrollbarwidthadjustment) + "px";
}
/* When re-enabling the Y-scrollbar again; */
if(window1 >= widthofelement) {element.style.right = "0px";}
if(window1 < widthofelement && scrollbarwidth > 0) {
element.style.width = "OriginalSizepx";
element.style.right = "0px";
}
For further clarification, this code will prevent elements from jumping to the right when you hide the vertical scrollbar.
padding is your answer, as Shikkediel said. Just change margin to that and it'll work.
The items move because you change the default margin body has, so the whole body moves to the left (in case we are modifying margin-right).
If you remove the scroll bar, the default margin will go right behind it, and then you need to "buffer" the rest, left of the margin, and that's what padding does.
I really enjoy working with the Inspecting tool Chrome supplies (Ctrl + Shift + I) and then in the Styles tab on the right scorll down until you see the measurements. It really helps understand the CSS box model.
Did you add 'px' here..
$('body').css('margin-right', scrollbarwidth+'px')??
Just nowI tried in w3schools. If you add 'px' to above syntax, it is working for me.

Screen Resizing Javascript

function sizeChange() {
var container = document.getElementById('container');
var main = document.getElementById('main');
var content = document.getElementById('content');
var h = window.innerHeight;
container.style.height = h;
main.style.height = h*.9;
content.style.height = (h*.9)*.9;
}
document.addEventListener("resize", sizeChange);
I'm trying to manipulate the items in my html so the height of the container is constantly the height of the window and that when it's scaled, the height of the container scales. I have it set up so it gets the ID of each element it's going to manipulate and then adjusts by a % of what I want it to be. Does anyone have any feedback on why this is happening?
I would think most of what you are doing could be done with CSS. If you want to stick with JS, then you need to add units to your values. So change the code to something like
container.style.height = h+"px";
main.style.height = Math.floor(h*.9)+"px";
content.style.height = Math.floor((h*.9)*.9)+"px";

how to resize div when browser resize using javascript

Is it possible to resize the entire 'div' container using javascript ? Inside my div i have 2 images and placed one over another. 1st image has is 720x1280 and 2nd image has 40x40. Now, while resizing my div container both the images should get resized proposinally.
function addWidth() {
var elem = document.getElementById("Image1");
if (elem != null) {
var mydiv = elem.clientWidth;
document.getElementById("divImage").style.width = mydiv + "px";
}
}
function resizediv() {
var height = window.innerWidth;
if (document.body.clientHeight) {
height = document.body.clientHeight;
}
height = parseInt(height) - 10;
document.getElementById("Image1").style.height = parseInt(height - document.getElementById("divImage").offsetTop - 8) + "px";
}
window.onresize = resizediv;
I have tried for an single image and its works fine. But i want the same to happens for an div container.
Try this:
$(window).resize(function() {
addWidth();
resizediv();
});
Along with this, like #Alex said, you can also add width:100% for the images.

JS Function to resize Background Proportionally is not working consistently

Imagine I have the below element appended to the document :
<html>
<head>
<style>
#resizable {
position: absolute;
top: 30px;
left: 30px;
background: url(http://www.some243x350image.jpg) no-repeat;
height: 243px;
width: 350px;
background-size: contain;
}
</style>
</head>
<body>
<div id="resizable"></div>
</body>
</html>
I'd like to be able to resize the above div proportionally, without any max/min height/width limits.
Below is the code I've written (Working Example : http://jsfiddle.net/7wYAh/) but it has two main bugs :
1. The div's height and width do not change proportionally all the time (even though the image obviously does, given that I'm using background-size: contain;.
2. There are sudden increases/decreases in the height/width of the element the moment the element is "grabbed".
I'm not using an aspect ratio variable. What I'm doing is that I choose randomly whether to resize based on height or width every time. So if the height changes then I'll resize the width based on the height increase. And vice versa. Isn't that proportional as well? Meaning that if the height increases by 2px, I'll increase the width by 2px as well and vice versa.
Looking for an answer to my problem I found this post but I don't want to use width/height limits and I don't understand the use of the ratio.
So can you spot anything wrong with this code (assume that the elementCanBeResized is set to true whenever the mouse grabs the bottom right corner of the div) :
Working Example : http://jsfiddle.net/7wYAh/
var $element = $('#resizable');
var previousResizeX, previousResizeY, resizeDistanceX, resizeDistanceY;
$(window).mousemove(function (mouseCoordinates)
{
if (!elementCanBeResized)
{
return;
}
if (typeof previousResizeX === 'undefined')
{
previousResizeX = mouseCoordinates.pageX;
previousResizeX = mouseCoordinates.pageY;
}
else
{
var newResizeX = mouseCoordinates.pageX;
var newResizeY = mouseCoordinates.pageY;
// resizing proportionally based on width change
if (newResizeX !== previousResizeX)
{
resizeDistanceX = newResizeX - previousResizeX;
previousResizeX = newResizeX;
previousResizeY += resizeDistanceX;
newWidth = $element.width() + resizeDistanceX;
newHeight = $element.height() + resizeDistanceX;
}
// resizing proportionally based on height change
else if (newResizeY !== previousResizeY)
{
resizeDistanceY = newResizeY - previousResizeY;
previousResizeY = newResizeY;
previousResizeX += resizeDistanceY;
newHeight = $element.height() + resizeDistanceY;
newWidth = $element.width() + resizeDistanceY;
}
$element.css({
height: newHeight,
width: newWidth
});
}
});
I assume that you want to resize by clicking at some point and then 'dragging' de mouse. Okay.
To question 2: You are storing the point where you click in previousResizeX. But I don't see you cleaning its value after the release of the button. If you don't set previousResizeX to 'undefined' again, next time you click there will be a 'sudden change' of width/height because newResizeX will be the distance between the place where you pressed the mouse the first time and its current position.
To question 1: You are increasing the width/height the same number of pixels every time, that's why your div doesn't resize proportionally. I explain: if you start with a div that's 200 x 100, its width is the double of the height. When you duplicate its width, to be proportional you have to duplicate the height. But if you drag your mouse 100px, you'll end with a (200+100) x (100 + 100) div, which is 300 x 200. The image's width is no longer the double of its height. You need to calculate the ratio between width and height at the beginning:
var ratio = $element.height() / $element.width();
...
resizeDistanceX = newResizeX - previousResizeX;
resizeDistanceY = resizeDistanceX * ratio;
previousResizeX = newResizeX;
previousResizeY += resizeDistanceY;
newWidth = $element.width() + resizeDistanceX;
newHeight = $element.height() + resizeDistanceY;
...
//For Y
resizeDistanceY = newResizeY - previousResizeY;
resizeDistanceX = resizeDistanceY / ratio;
previousResizeY = newResizeY;
previousResizeX += resizeDistanceX;
newHeight = $element.height() + resizeDistanceY;
newWidth = $element.width() + resizeDistanceX;
And remember to set resizeDistanceX and resizeDistanceY once the mouse is released.
Hope this helps you.

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