Resize a dynamically generated string with javascript? - javascript

I've got an HTML page with a grid of divs containing read only text boxes, each containing a string which changes dynamically via a php script. I've been working on a javascript function to detect the string length and resize the string accordingly so that it fits cleanly in the textbox with no overflow.
This is an example of my div...
<a href='http://burstu.com'>
<div id='toprightlefthigh' class='resize'>
<input type="text" id="toprightlefthighbox" class="idea" value="" readonly>
</div>
</a>
I've tried various scripts, and my nearest fit is this one...
var div2length = div2.value.length; if(div2length <=50) {
div2.value.fontSize="10px"; }
But no such luck.
Any ideas?

div2.value.fontSize="10px";
this doesn't work; you need to access the fontSize using style:
div2.style.fontSize="10px";

Are you aware of the fact that font-size is not inherited by a form element?
By default, browsers render most form elements (textareas, text boxes, buttons, etc) using OS controls or browser controls. So most of the font properties are taken from the theme the OS is currently using.
You'll have to target the form elements themselves if you want to change their font/text styles. In stead of targeting your wrapper div (I guess you are doing by the name you gave you're variable, div2 is not beeing set in your snippet), you should target the input directly.
#andrewGibson is also right btw, you should use the style property.

Have you taken a look at http://fittextjs.com/ it does just that. I'm not a fan of the "throw jquery at it" crowd but that one does the job and its open source so you could have a poke around if you wanted to learn more if you are after a pure JS solution. In this case though why re-invent the wheel :)

Do this...
Html:
<input type="text" id="toprightlefthighbox" class="idea" value="" />
Javascript:
var MAX_FONT = 20;
var MIN_FONT = 10;
var YOUR_STRING = "Here is my long long long long string";
var textbox = document.getElementById("toprightlefthighbox");
var fontSize = MAX_FONT + 1;
var element = document.createElement("div");
element.style.visibility = "hidden";
element.style.display = "inline-block";
element.style.padding = "0px";
element.style.fontFamily = "Arial";
element.innerHTML = YOUR_STRING;
document.body.appendChild(element);
do
{
fontSize -= 1; //maybe -= 0.5 in some browsers? Just change the +1 above too
element.style.fontSize = fontSize + "px";
} while (fontSize > MIN_FONT && element.clientWidth > textbox.clientWidth);
document.body.removeChild(element);
element = null;
textbox.value = YOUR_STRING;
textbox.style.fontSize = fontSize + "px";
With CSS:
#toprightlefthighbox { width: 205px; height: 25px; font-family: arial; }
JSFiddle:
http://jsfiddle.net/hkN35/4/
Notice that when you decrease the width of the textbox to 200px it will bump the font size down.

Related

Javascript/Jquery flow text into divs

How do I flow a text stream from one div to the next? Each div has a fixed height and width and I need the data to be passed to the first, then if that is filled overflow to another etc. (The second etc. divs need to be dynamically created). Eventually the divs will be contenteditable, this is the page technique for a simple WYSIWYG style editor.
Please help...
JS Fiddle (note zoom in use on body)(I need to reflow on keyup/down, make pages and remove as necessary and be able to add in the middle)
function loadgo(){
run();
var h = document.getElementById('page'+(document.getElementById("pagecount").value-1)).offsetHeight;
document.getElementById("loadgo").value = h+1;
if (h > 1135){
var pagecount = document.getElementById("pagecount").value;
//$('body').append("<div class=page style='color:#F00' id='page"+pagecount+"' contenteditable>"+this.id+"</div>");
var objTo = document.body;
var divtest = document.createElement("div");
divtest.style.color = '#F00';
divtest.id = "page"+pagecount;
divtest.className = 'page';
divtest.contentEditable = "true";
divtest.innerHTML = "new div";
objTo.appendChild(divtest);
document.getElementById("page"+pagecount).focus();
document.getElementById("pagecount").value++;
zoomin();zoomout();
run();
}
}
function run(){
setTimeout(function() {
loadgo();
}, 500);
}
loadgo();
What you're looking for is called CSS Regions. This allows your text to flow through various containers placed on your site.
You can read about it on Adobe's site, and Apple has a nice WWDC video explaining how to implement it (starts at 8:40). Also check out the Editor's Draft.

Modify external CSS values

Hi I am trying to dynamicly change the height of a division using JavaScript but I can only get the JS to read the Height element of the div if it defined using style tags inside the HTML mark-up.
If its in a separate sheet it returns NaN, I'm assuming because it can't find a value and is actually returning null (I'm using ParseInt to make it work).
Here is the HTML:
<div id="dropdown_container">
<div id="dropdown" style="height:100px;">
a
</div>
</div>
(Wish the HTML stlye markup)
And here is the JS:
function clickDown() {
var el = document.getElementById('dropdown');
var maxHeight = 200;
getHeight = parseInt(el.style.height.substring(0,(el.style.height.length)-2));
console.log(getHeight);
getHeight += 2;
el.style.height = getHeight + 'px';
timeoutHeightInc = setTimeout('clickDown()',15);
if(getHeight >= maxHeight){
clearTimeout(timeoutHeightInc);
}
}
Does anyone know of a reason for this (mis?)functionaility. And a solution for it?
Here is a jsFiddle.
Try moving the height over to the CSS to see the issue i'm having.
ParseInt is missing it's radix.
You say:
I can only get the JS to read the Height element of the div if it
defined using style tags inside the HTML mark-up
Now you are only reading the div's attribute style. Which you set inline. So if you remove that, than you can not read it anymore. Make sense?
You want to get the computed height. Try: .offsetHeight
Basis of test-case to play with inc. fixed radix. this fiddle
UPDATE: tada: fixed, see this updated fiddle
function clickDown() {
var el = document.getElementById('dropdown');
var maxHeight = 200;
getHeight = parseInt(el.offsetHeight,10);
console.log(getHeight);
getHeight += 2;
el.style.height = getHeight + 'px';
timeoutHeightInc = setTimeout('clickDown()',15);
if(getHeight >= maxHeight){
clearTimeout(timeoutHeightInc);
}
}

Can a textarea be sized to the content entered into it

I have a textarea on a form that is populated with text from a database query ready for someone to edit.
I would like the textarea to show the whole content without the need to scroll, but don't want to put a large textarea when there is only a small amount of text.
Text can be from 5 to 300 characters.
I have seen a solution to this type of issue but only where the textarea grows onkeyup as shown below.
<script>
function textAreaAdjust(o) {
o.style.height = "1px";
o.style.height = (25+o.scrollHeight)+"px";
}
</script>
<textarea onkeyup="textAreaAdjust(this)" style="overflow:hidden"></textarea>
Firstly, don't use onkeyup. It's not suitable for detecting text input.
I use the following code to resize a textarea to constantly resize a textarea element to fit the content:
var tarea = document.getElementsByTagName("textarea")[0];
tarea.oninput = function () {
tarea.style.height = tarea.scrollHeight + "px";
}
​
However, oninput isn't supported in older versions of IE, so you'll need to add onpropertychange if you need it to work in IE 8 and lower:
var tarea = document.getElementsByTagName("textarea")[0];
tarea.oninput = tarea.onpropertychange = function (evt) {
evt = evt || window.evt;
if (evt.type == "propertychange" && evt.propertyName != "value")
return;
tarea.style.height = tarea.scrollHeight + "px";
}
Working Demo: http://jsfiddle.net/D5e8t/
You can call the method on page load.
Copy the content of textarea to a invisible div, with the same width, and styles that affect size (font-size, line-height, padding, etc.). Measure the height of said div, and set your textarea to the same height.
Just little modifications to the above code will make textarea autosizable.
Just perfiorm the below steps
1) Add id to your text area
<textarea onkeyup="textAreaAdjust(this)" id="txt" runat="server" style="overflow:hidden"></textarea>
2) Before a closing of bode tag add the javascript code to call the testAreaAdjust block
<script type="text/javascript">
textAreaAdjust(document.getElementById('txt'));
</script>
This will autosize the textbox.
Hope this will help you

How do I script for resetting the default font size with Javascript?

This is related to this question.
The answer was given with the script below to reset the font size back to the default:
function resetToDefaultFontSize() {
var p = document.getElementsByTagName('div');
for(i=0;i<p.length;i++) {
p[i].style.fontSize = "12px";
}
}
This works fine for a page that only has one font size of 12 px. How can the script be modified to allow up to three different font sizes on the same page?
Try fontSize = "inherit";
First, I would set my body font-size to 75% using CSS. This will set the overall font to 12px. Once this has been done, you can use:
fontSize = '1em';
So my JavaScript would look like:
function resetToDefaultFontSize() {
var body = document.getElementsByTagName('body')[0];
body.style.fontSize = '1em';
}
If you use this technique, you need to make sure all other font-sizes on the page are using the em unit.

How to autosize a textarea using Prototype?

I'm currently working on an internal sales application for the company I work for, and I've got a form that allows the user to change the delivery address.
Now I think it would look much nicer, if the textarea I'm using for the main address details would just take up the area of the text in it, and automatically resize if the text was changed.
Here's a screenshot of it currently.
Any ideas?
#Chris
A good point, but there are reasons I want it to resize. I want the area it takes up to be the area of the information contained in it. As you can see in the screen shot, if I have a fixed textarea, it takes up a fair wack of vertical space.
I can reduce the font, but I need address to be large and readable. Now I can reduce the size of the text area, but then I have problems with people who have an address line that takes 3 or 4 (one takes 5) lines. Needing to have the user use a scrollbar is a major no-no.
I guess I should be a bit more specific. I'm after vertical resizing, and the width doesn't matter as much. The only problem that happens with that, is the ISO number (the large "1") gets pushed under the address when the window width is too small (as you can see on the screenshot).
It's not about having a gimick; it's about having a text field the user can edit that won't take up unnecessary space, but will show all the text in it.
Though if someone comes up with another way to approach the problem I'm open to that too.
I've modified the code a little because it was acting a little odd. I changed it to activate on keyup, because it wouldn't take into consideration the character that was just typed.
resizeIt = function() {
var str = $('iso_address').value;
var cols = $('iso_address').cols;
var linecount = 0;
$A(str.split("\n")).each(function(l) {
linecount += 1 + Math.floor(l.length / cols); // Take into account long lines
})
$('iso_address').rows = linecount;
};
Facebook does it, when you write on people's walls, but only resizes vertically.
Horizontal resize strikes me as being a mess, due to word-wrap, long lines, and so on, but vertical resize seems to be pretty safe and nice.
None of the Facebook-using-newbies I know have ever mentioned anything about it or been confused. I'd use this as anecdotal evidence to say 'go ahead, implement it'.
Some JavaScript code to do it, using Prototype (because that's what I'm familiar with):
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<script src="http://www.google.com/jsapi"></script>
<script language="javascript">
google.load('prototype', '1.6.0.2');
</script>
</head>
<body>
<textarea id="text-area" rows="1" cols="50"></textarea>
<script type="text/javascript" language="javascript">
resizeIt = function() {
var str = $('text-area').value;
var cols = $('text-area').cols;
var linecount = 0;
$A(str.split("\n")).each( function(l) {
linecount += Math.ceil( l.length / cols ); // Take into account long lines
})
$('text-area').rows = linecount + 1;
};
// You could attach to keyUp, etc. if keydown doesn't work
Event.observe('text-area', 'keydown', resizeIt );
resizeIt(); //Initial on load
</script>
</body>
</html>
PS: Obviously this JavaScript code is very naive and not well tested, and you probably don't want to use it on textboxes with novels in them, but you get the general idea.
One refinement to some of these answers is to let CSS do more of the work.
The basic route seems to be:
Create a container element to hold the textarea and a hidden div
Using Javascript, keep the textarea’s contents synced with the div’s
Let the browser do the work of calculating the height of that div
Because the browser handles rendering / sizing the hidden div, we avoid
explicitly setting the textarea’s height.
document.addEventListener('DOMContentLoaded', () => {
textArea.addEventListener('change', autosize, false)
textArea.addEventListener('keydown', autosize, false)
textArea.addEventListener('keyup', autosize, false)
autosize()
}, false)
function autosize() {
// Copy textarea contents to div browser will calculate correct height
// of copy, which will make overall container taller, which will make
// textarea taller.
textCopy.innerHTML = textArea.value.replace(/\n/g, '<br/>')
}
html, body, textarea {
font-family: sans-serif;
font-size: 14px;
}
.textarea-container {
position: relative;
}
.textarea-container > div, .textarea-container > textarea {
word-wrap: break-word; /* make sure the div and the textarea wrap words in the same way */
box-sizing: border-box;
padding: 2px;
width: 100%;
}
.textarea-container > textarea {
overflow: hidden;
position: absolute;
height: 100%;
}
.textarea-container > div {
padding-bottom: 1.5em; /* A bit more than one additional line of text. */
visibility: hidden;
}
<div class="textarea-container">
<textarea id="textArea"></textarea>
<div id="textCopy"></div>
</div>
Here's another technique for autosizing a textarea.
Uses pixel height instead of line height: more accurate handling of line wrap if a proportional font is used.
Accepts either ID or element as input
Accepts an optional maximum height parameter - useful if you'd rather not let the text area grow beyond a certain size (keep it all on-screen, avoid breaking layout, etc.)
Tested on Firefox 3 and Internet Explorer 6
Code:
(plain vanilla JavaScript)
function FitToContent(id, maxHeight)
{
var text = id && id.style ? id : document.getElementById(id);
if (!text)
return;
/* Accounts for rows being deleted, pixel value may need adjusting */
if (text.clientHeight == text.scrollHeight) {
text.style.height = "30px";
}
var adjustedHeight = text.clientHeight;
if (!maxHeight || maxHeight > adjustedHeight)
{
adjustedHeight = Math.max(text.scrollHeight, adjustedHeight);
if (maxHeight)
adjustedHeight = Math.min(maxHeight, adjustedHeight);
if (adjustedHeight > text.clientHeight)
text.style.height = adjustedHeight + "px";
}
}
Demo:
(uses jQuery, targets on the textarea I'm typing into right now - if you have Firebug installed, paste both samples into the console and test on this page)
$("#post-text").keyup(function()
{
FitToContent(this, document.documentElement.clientHeight)
});
Probably the shortest solution:
jQuery(document).ready(function(){
jQuery("#textArea").on("keydown keyup", function(){
this.style.height = "1px";
this.style.height = (this.scrollHeight) + "px";
});
});
This way you don't need any hidden divs or anything like that.
Note: you might have to play with this.style.height = (this.scrollHeight) + "px"; depending on how you style the textarea (line-height, padding and that kind of stuff).
Here's a Prototype version of resizing a text area that is not dependent on the number of columns in the textarea. This is a superior technique because it allows you to control the text area via CSS as well as have variable width textarea. Additionally, this version displays the number of characters remaining. While not requested, it's a pretty useful feature and is easily removed if unwanted.
//inspired by: http://github.com/jaz303/jquery-grab-bag/blob/63d7e445b09698272b2923cb081878fd145b5e3d/javascripts/jquery.autogrow-textarea.js
if (window.Widget == undefined) window.Widget = {};
Widget.Textarea = Class.create({
initialize: function(textarea, options)
{
this.textarea = $(textarea);
this.options = $H({
'min_height' : 30,
'max_length' : 400
}).update(options);
this.textarea.observe('keyup', this.refresh.bind(this));
this._shadow = new Element('div').setStyle({
lineHeight : this.textarea.getStyle('lineHeight'),
fontSize : this.textarea.getStyle('fontSize'),
fontFamily : this.textarea.getStyle('fontFamily'),
position : 'absolute',
top: '-10000px',
left: '-10000px',
width: this.textarea.getWidth() + 'px'
});
this.textarea.insert({ after: this._shadow });
this._remainingCharacters = new Element('p').addClassName('remainingCharacters');
this.textarea.insert({after: this._remainingCharacters});
this.refresh();
},
refresh: function()
{
this._shadow.update($F(this.textarea).replace(/\n/g, '<br/>'));
this.textarea.setStyle({
height: Math.max(parseInt(this._shadow.getHeight()) + parseInt(this.textarea.getStyle('lineHeight').replace('px', '')), this.options.get('min_height')) + 'px'
});
var remaining = this.options.get('max_length') - $F(this.textarea).length;
this._remainingCharacters.update(Math.abs(remaining) + ' characters ' + (remaining > 0 ? 'remaining' : 'over the limit'));
}
});
Create the widget by calling new Widget.Textarea('element_id'). The default options can be overridden by passing them as an object, e.g. new Widget.Textarea('element_id', { max_length: 600, min_height: 50}). If you want to create it for all textareas on the page, do something like:
Event.observe(window, 'load', function() {
$$('textarea').each(function(textarea) {
new Widget.Textarea(textarea);
});
});
Here is a solution with JQuery:
$(document).ready(function() {
var $abc = $("#abc");
$abc.css("height", $abc.attr("scrollHeight"));
})
abc is a teaxtarea.
Check the below link:
http://james.padolsey.com/javascript/jquery-plugin-autoresize/
$(document).ready(function () {
$('.ExpandableTextCSS').autoResize({
// On resize:
onResize: function () {
$(this).css({ opacity: 0.8 });
},
// After resize:
animateCallback: function () {
$(this).css({ opacity: 1 });
},
// Quite slow animation:
animateDuration: 300,
// More extra space:
extraSpace:20,
//Textarea height limit
limit:10
});
});
Just revisiting this, I've made it a little bit tidier (though someone who is full bottle on Prototype/JavaScript could suggest improvements?).
var TextAreaResize = Class.create();
TextAreaResize.prototype = {
initialize: function(element, options) {
element = $(element);
this.element = element;
this.options = Object.extend(
{},
options || {});
Event.observe(this.element, 'keyup',
this.onKeyUp.bindAsEventListener(this));
this.onKeyUp();
},
onKeyUp: function() {
// We need this variable because "this" changes in the scope of the
// function below.
var cols = this.element.cols;
var linecount = 0;
$A(this.element.value.split("\n")).each(function(l) {
// We take long lines into account via the cols divide.
linecount += 1 + Math.floor(l.length / cols);
})
this.element.rows = linecount;
}
}
Just it call with:
new TextAreaResize('textarea_id_name_here');
I've made something quite easy. First I put the TextArea into a DIV. Second, I've called on the ready function to this script.
<div id="divTable">
<textarea ID="txt" Rows="1" TextMode="MultiLine" />
</div>
$(document).ready(function () {
var heightTextArea = $('#txt').height();
var divTable = document.getElementById('divTable');
$('#txt').attr('rows', parseInt(parseInt(divTable .style.height) / parseInt(altoFila)));
});
Simple. It is the maximum height of the div once it is rendered, divided by the height of one TextArea of one row.
I needed this function for myself, but none of the ones from here worked as I needed them.
So I used Orion's code and changed it.
I added in a minimum height, so that on the destruct it does not get too small.
function resizeIt( id, maxHeight, minHeight ) {
var text = id && id.style ? id : document.getElementById(id);
var str = text.value;
var cols = text.cols;
var linecount = 0;
var arStr = str.split( "\n" );
$(arStr).each(function(s) {
linecount = linecount + 1 + Math.floor(arStr[s].length / cols); // take into account long lines
});
linecount++;
linecount = Math.max(minHeight, linecount);
linecount = Math.min(maxHeight, linecount);
text.rows = linecount;
};
Like the answer of #memical.
However I found some improvements. You can use the jQuery height() function. But be aware of padding-top and padding-bottom pixels. Otherwise your textarea will grow too fast.
$(document).ready(function() {
$textarea = $("#my-textarea");
// There is some diff between scrollheight and height:
// padding-top and padding-bottom
var diff = $textarea.prop("scrollHeight") - $textarea.height();
$textarea.live("keyup", function() {
var height = $textarea.prop("scrollHeight") - diff;
$textarea.height(height);
});
});
My solution not using jQuery (because sometimes they don't have to be the same thing) is below. Though it was only tested in Internet Explorer 7, so the community can point out all the reasons this is wrong:
textarea.onkeyup = function () { this.style.height = this.scrollHeight + 'px'; }
So far I really like how it's working, and I don't care about other browsers, so I'll probably apply it to all my textareas:
// Make all textareas auto-resize vertically
var textareas = document.getElementsByTagName('textarea');
for (i = 0; i<textareas.length; i++)
{
// Retain textarea's starting height as its minimum height
textareas[i].minHeight = textareas[i].offsetHeight;
textareas[i].onkeyup = function () {
this.style.height = Math.max(this.scrollHeight, this.minHeight) + 'px';
}
textareas[i].onkeyup(); // Trigger once to set initial height
}
Here is an extension to the Prototype widget that Jeremy posted on June 4th:
It stops the user from entering more characters if you're using limits in textareas. It checks if there are characters left. If the user copies text into the textarea, the text is cut off at the max. length:
/**
* Prototype Widget: Textarea
* Automatically resizes a textarea and displays the number of remaining chars
*
* From: http://stackoverflow.com/questions/7477/autosizing-textarea
* Inspired by: http://github.com/jaz303/jquery-grab-bag/blob/63d7e445b09698272b2923cb081878fd145b5e3d/javascripts/jquery.autogrow-textarea.js
*/
if (window.Widget == undefined) window.Widget = {};
Widget.Textarea = Class.create({
initialize: function(textarea, options){
this.textarea = $(textarea);
this.options = $H({
'min_height' : 30,
'max_length' : 400
}).update(options);
this.textarea.observe('keyup', this.refresh.bind(this));
this._shadow = new Element('div').setStyle({
lineHeight : this.textarea.getStyle('lineHeight'),
fontSize : this.textarea.getStyle('fontSize'),
fontFamily : this.textarea.getStyle('fontFamily'),
position : 'absolute',
top: '-10000px',
left: '-10000px',
width: this.textarea.getWidth() + 'px'
});
this.textarea.insert({ after: this._shadow });
this._remainingCharacters = new Element('p').addClassName('remainingCharacters');
this.textarea.insert({after: this._remainingCharacters});
this.refresh();
},
refresh: function(){
this._shadow.update($F(this.textarea).replace(/\n/g, '<br/>'));
this.textarea.setStyle({
height: Math.max(parseInt(this._shadow.getHeight()) + parseInt(this.textarea.getStyle('lineHeight').replace('px', '')), this.options.get('min_height')) + 'px'
});
// Keep the text/character count inside the limits:
if($F(this.textarea).length > this.options.get('max_length')){
text = $F(this.textarea).substring(0, this.options.get('max_length'));
this.textarea.value = text;
return false;
}
var remaining = this.options.get('max_length') - $F(this.textarea).length;
this._remainingCharacters.update(Math.abs(remaining) + ' characters remaining'));
}
});
#memical had an awesome solution for setting the height of the textarea on pageload with jQuery, but for my application I wanted to be able to increase the height of the textarea as the user added more content. I built off memical's solution with the following:
$(document).ready(function() {
var $textarea = $("p.body textarea");
$textarea.css("height", ($textarea.attr("scrollHeight") + 20));
$textarea.keyup(function(){
var current_height = $textarea.css("height").replace("px", "")*1;
if (current_height + 5 <= $textarea.attr("scrollHeight")) {
$textarea.css("height", ($textarea.attr("scrollHeight") + 20));
}
});
});
It's not very smooth but it's also not a client-facing application, so smoothness doesn't really matter. (Had this been client-facing, I probably would have just used an auto-resize jQuery plugin.)
For those that are coding for IE and encounter this problem. IE has a little trick that makes it 100% CSS.
<TEXTAREA style="overflow: visible;" cols="100" ....></TEXTAREA>
You can even provide a value for rows="n" which IE will ignore, but other browsers will use. I really hate coding that implements IE hacks, but this one is very helpful. It is possible that it only works in Quirks mode.
Internet Explorer, Safari, Chrome and Opera users need to remember to explicidly set the line-height value in CSS. I do a stylesheet that sets the initial properites for all text boxes as follows.
<style>
TEXTAREA { line-height: 14px; font-size: 12px; font-family: arial }
</style>
Here is a function I just wrote in jQuery to do it - you can port it to Prototype, but they don't support the "liveness" of jQuery so elements added by Ajax requests will not respond.
This version not only expands, but it also contracts when delete or backspace is pressed.
This version relies on jQuery 1.4.2.
Enjoy ;)
http://pastebin.com/SUKeBtnx
Usage:
$("#sometextarea").textareacontrol();
or (any jQuery selector for example)
$("textarea").textareacontrol();
It was tested on Internet Explorer 7/Internet Explorer 8, Firefox 3.5, and Chrome. All works fine.
Using ASP.NET, just simply do this:
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Automatic Resize TextBox</title>
<script type="text/javascript">
function setHeight(txtarea) {
txtarea.style.height = txtdesc.scrollHeight + "px";
}
</script>
</head>
<body>
<form id="form1" runat="server">
<asp:TextBox ID="txtarea" runat= "server" TextMode="MultiLine" onkeyup="setHeight(this);" onkeydown="setHeight(this);" />
</form>
</body>
</html>

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