Develop Reference

how to get/set component size dynamically

I have a DIV container that has a paragraph and another inner DIV displayed in line.
Inner DIV is unknown but it's always the same and not gonna change. I can sent min-width if needed. Now based on outer DIV size I need to either cut (with three dots) or show full paragraph string. But I have to set paragraph width in css to show that three dots when outer div size is too small.
<div className="divOuter">
<p>very long string</p>
<div className="divInner">some div stuff</div>
</div>
.p {
position: relative;
float: left;
text-overflow: ellipsis;
overflow: hidden;
width: ?????; // what do I set here?????
white-space: nowrap;
}
.divInner {
display: flex;
float: right;
align-items: center;
}
|--------------------------------------|
|very long string some div stuff|
|--------------------------------------|
need to get this when outer DIV resized:
|------------------------------|
|very long st... some div stuff|
|------------------------------|
|--------------------|
|ve... some div stuff|
|--------------------|

This is what you are looking for.
You don't need to give any width to the long string p element.
There is a property of flexbox called flex. When you set this to 1, it will elongate that element to take up the remaining horizontal space in the parent.
After that, you just have to give text-overflow: ellipsis; overflow: hidden; to make the ... appear.
Run the below snippet to see it working.
.divOuter {
display: flex;
width: 100%;
}
.longString {
flex: 1;
text-overflow: ellipsis;
overflow: hidden;
white-space: nowrap;
}
.divInner {}
<div class="divOuter">
<p class="longString">very long string very long string very long string very long string very long string</p>
<p class="divInner">some div stuff</p>
</div>

Textarea with height: auto and line breaks

If I have a textarea with some text on it, and the text has some line breaks on it, if I set my style to:
textarea {
height: auto;
overflow: hidden;
resize: none;
}
When I load the page, then the text area will only automatically set the height of the textarea until it finds the first line break, example:
For a textarea with this text:
This is an
example text
When the page is loaded, the textarea will be shown as:
This is an
Browser thinks line breaks are the end of the whole text. How do I fix it?

The text is still there if you use the arrow keys to move down, it's just that the textarea by default isn't tall enough to show all the text. You can use the rows attribute to define now many rows of text the textarea should have by default.
Alternatively, if you want more control you can use a div with the attribute contenteditable="true".
textarea {
height: auto;
overflow: hidden;
resize: none;
}
/*
* CSS for div with contenteditable="true"
*/
.textarea {
display: inline-block;
white-space: pre-wrap;
overflow-wrap: break-word;
border: 1px solid;
padding: 2px;
}
<textarea rows="3">This is an
example text
</textarea>
<div class="textarea" contenteditable="true">This is an
example text
</div>

To any one reading this, the solution I came up with is simple. With JQuery, on document ready:
$( document ).ready(function() {
var trueHeight = $( '#your_textarea' ).prop( 'scrollHeight' );
$( '#your_textarea' ).height( trueHeight );
});
Works like a charm.

.textarea {
height: auto;
overflow: hidden;
resize: none;
background-color: #000000;
color: #ffffff;
padding-left: 20px;
}
<div class="textarea"><p>This is an</p><p>example text</p></div>
Please check the above code.

You can use the rows attribute to set the height of your textarea.
<textarea rows='100'>this is an
example text</textarea>
Fiddle: https://jsfiddle.net/jvw7s1rz/2/

How to detect if text flows outside bounding box

I have a situation beyond my immediate control (library-related) where text in an HTML div goes beyond its enclosing bounding box. I give a simple example below, although in my case it is a div within a <foreignObject> inside a <g> within an <svg>...
In the example below, is there a way to programmatically detect if the text goes beyond its bounding box? Getting the size of the enclosed <div> and its associated parent seems to return the same width, which is NOT the width of the text.
<!doctype html>
<html lang="">
<head>
<style>
.container {
background: yellow;
border: 2px solid black;
width: 200px;
height: 100px;
}
.tooBig {
white-space: nowrap;
}
</style>
<script>
function figureOutSizes() {
let container = document.getElementById("my-container");
let contBound = container.getBoundingClientRect();
console.log(`Container size: ${boundToString(contBound)}` );
let tooBig = document.getElementById("tooBig");
let bigBound = tooBig.getBoundingClientRect();
console.log(`text size: ${boundToString(bigBound)}` );
}
function boundToString(rect) {
return `rect(w=${rect.width}, h=${rect.height})`;
}
</script>
<meta charset="utf-8">
<title>Out of bounds</title>
</head>
<body>
<div id="my-container" class="container" >
<div id="tooBig" class="tooBig">This line is too big for its containing div! What am I going to do?</div>
</div>
<div>
<button onclick="figureOutSizes();">Get sizes</button>
</div>
</body>
</html>

You can use scrollWidth and scrollHeight instead of getBoundingClientRect:
function figureOutSizes() {
let container = document.getElementById("my-container");
let contBound = container.getBoundingClientRect();
console.log(`Container size: ${boundToString(contBound)}`);
let tooBig = document.getElementById("tooBig");
let bigBound = {
width: tooBig.scrollWidth,
height: tooBig.scrollHeight
};
console.log(`text size: ${boundToString(bigBound)}`);
}
function boundToString(rect) {
return `rect(w=${rect.width}, h=${rect.height})`;
}
.container {
background: yellow;
border: 2px solid black;
width: 200px;
height: 100px;
}
.tooBig {
white-space: nowrap;
}
<div id="my-container" class="container">
<div id="tooBig" class="tooBig">This line is too big for its containing div! What am I going to do?</div>
</div>
<div>
<button onclick="figureOutSizes();">Get sizes</button>
</div>

Getting only text width
If you only want to detect if a string goes out of its parent element, the best way is to do it with the jQuery element.width() method where you put the string inside a span, because the div element automatically gets a 100% width by default.
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<span id='tooBig' style='white-space: nowrap;'>This string is too long ...</span>
<script>
var x = $('#tooBig').width();
console.log("Text width: "+x);
</script>
Now, you can compare it to the container's width and check if the string is wider than its parent.
If you want to avoid wrapping, add the white-space: nowrap; CSS style for the parent span or use character encoding instead of spaces.
Wrap string automatically with CSS
I suppose your purpose is not only to detect if the text flows out of a div, rather to wrap the string, so there is a quite elegant CSS method for this. The technique uses flexbox, test-overflow: ellipsis and overflow: hidden and the behaviour of string overflow. You do not need to use any kind of JavaScript for it, the text wraps and get the ... ending automatically.
/* Text is a header now,
so need to truncate there for it to work */
.flex-child > h2 {
white-space: nowrap;
overflow: hidden;
text-overflow: ellipsis;
}
/* Text is directly within flex child,
so doing the wrapping here */
.flex-child {
white-space: nowrap;
overflow: hidden;
text-overflow: ellipsis;
}
<div class="flex-parent">
<div class="flex-child">
<h2>Resize the window to see how this very very long text gets resized...</h2>
</div>
</div>
Reference
CSS Flexbox Resize
jQuery text width

Fixed size of div element

I am trying to create a div element with fixed size in html. My problem is, the above div receives input text from backbone. The size of text is unknown, so every time that the transmitted text is big, automatically the size of the div is change. How is it possible to display only the first words of the text that fit in the predefined bounding box of the div???
My css code
.hashTagsCloud {
max-width: 500px;
max-height: 400px;
overflow: hidden;
}
And html code:
<div class= "hashTagsCloud span4 offset1 "> //bootstrap
<div id="profiles> //backbone view
<script id="profileTemplate" type="text/template">//backbone template
</script>
</div>
</div>
I take data with getElementById.

You can use the overflow: hidden; property, granted that you set a width and height on the div already.
<style type='text/css'>
.text {
width: 100px;
height: 18px;
overflow: hidden;
white-space: pre-line; /* breaks up the text on spaces before hiding */
}
</style>
<div class='text'>some really really really long text</div>

In the CSS for the Div Element, you could use
overflow: hidden

you can use from this text-overflow: ellipsis; of css, check this

Add dots/ellipsis on div/span element overflow without using jquery

Need to implement functionality similar to what dotdotdot jQuery plugin does
but cannot use javascript frameworks (like jquery or ext).
Is there any easy way to add the dots to the content of div or span element if content takes more space then element should???
(similar to what css overflow: ellipsis setting does)
Can't use ellipsis beacause it doesn't work with many lines when height is limited.
Thank you :)

Why not using the CSS property text-overflow? It works great as long as you define a width in your tag.
Class in CSS:
.clipped {
overflow: hidden;
white-space: nowrap;
text-overflow: ellipsis;
}
<div class="clipped" style="width: 100px;" title="This is a long text">This is a long text<div>
You can also add the text to the title attribute, so the user can see the whole text when hovering over the element.

Works for any number of lines and any width without any javascript - and is responsive. Simply set your max-height to a multiple of your line height: i.e. (22px line height) * (max 3 lines of text) = (max height 66px).
https://codepen.io/freer4/pen/prKLPy
html, body, p { margin: 0; padding: 0; font-family: sans-serif;line-height:22px;}
.ellipsis{
overflow:hidden;
margin-bottom:1em;
position:relative;
}
.ellipsis:before {
content: "\02026";
position: absolute;
bottom: 0;
right:0;
width: 1.8em;
height:22px;
margin-left: -1.8em;
padding-right: 5px;
text-align: right;
background-size: 100% 100%;
background: linear-gradient(to right, rgba(255, 255, 255, 0), white 40%, white);
z-index:2;
}
.ellipsis::after{
content:"";
position:relative;
display:block;
float:right;
background:#FFF;
width:3em;
height:22px;
margin-top:-22px;
z-index:3;
}
/*For testing*/
.ellipsis{
max-width:500px;
text-align:justify;
}
.ellipsis-3{
max-height:66px;
}
.ellipsis-5{
max-height:110px;
}
<div class="ellipsis ellipsis-3">
<p>Here we can have a great many lines of text and it works as we expect it to. Here we can have a great many lines of text and it works as we expect it to. Here we can have a great many lines of text and it works as we expect it to. Here we can have a great many lines of text and it works as we expect it to.</p>
</div>
<div class="ellipsis ellipsis-5">
<p>The number of lines shown is easily controlled by setting the max-height of the .ellipsis element. The downsides are the requirement of a wrapping element, and that if the text is precisely as long as your number of lines, you'll get a white area covering the very trailing end of your text. You've been warned. This is just some pushing text to make the element longer. See the ellipsis? Yay.</p>
</div>

You could try:
text-overflow: ellipsis;
-o-text-overflow: ellipsis;
This will only work if your elements are not dynamically sized. They will have to have a width set or some other mechanism to keep them from growing to allow more content.

My solution to my problem can seem a little awkward, but it works for me:)
I used a little of CSS:
word-wrap: break-word;
and Javascript:
var spans = document.getElementsByTagName("span");
for (var i in spans) {
var span = spans[i];
if (/*some condition to filter spans*/) { // just
if (navigator.appName == 'Microsoft Internet Explorer') {
span.parentNode.style.display ='inline-block';
}
if (span.parentNode.clientHeight > 50 ) {
span.innerHTML = span.innerHTML.substr(0, 26) + ' ...';
}
}
}

FOR ALL Browser:
.dotdot{ white-space: nowrap; text-overflow: ellipsis; overflow: hidden; max-width:80px}
.dotdot:before { content: '';}
<div class="dotdot">[Button Text Goes here][1]</div>