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HTML5 textarea text box Adaptive height based on input content

Source: Internet
Author: User
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<! DOCTYPE html>

<meta http-equiv= "Content-type" content= "text/html; Charset=utf-8 "/>

<title> text Box Adaptive height according to input </title>

<style type= "Text/css" >

H2 {

Text-align:center;

margin:50px Auto;

}

#textarea {

Display:block;

margin:0 Auto;

Overflow:hidden;

width:550px;

font-size:14px;

height:18px;

line-height:24px;

padding:2px;

border-radius:4px;

min-height:20px;

max-height:70px;

}

TEXTAREA {

outline:0 none;

Border-color:rgba (82, 168, 236, 0.8);

Box-shadow:inset 0 1px 3px rgba (0, 0, 0, 0.1), 0 0 8px Rgba (82, 168, 236, 0.6);

}

</style>

<script>

/** * text box adaptive height based on input content

* @param {htmlelement} input box element

* @param {Number} sets the distance the cursor keeps from the input box (default 0)

* @param {Number} to set the maximum height (optional)

*/

var Autotextarea = function (Elem, Extra, maxheight) {

Extra = Extra | | 0;

var Isfirefox =!! Document.getboxobjectfor | | ' Mozinnerscreenx ' in window,

Isopera =!! Window.opera &&!! Window.opera.toString (). IndexOf (' opera '),

addevent = function (type, callback) {

Elem.addeventlistener?

Elem.addeventlistener (Type, callback, false):

Elem.attachevent (' on ' + type, callback);

},

GetStyle = Elem.currentstyle? function (name) {

var val = elem.currentstyle[name];

if (name = = = ' Height ' && val.search (/px/i)!== 1) {

var rect = Elem.getboundingclientrect ();

                                      return Rect.bottom-rect.top-                                     

                                                 parsefloat (GetStyle (' PaddingTop '))-                                     

Parsefloat (GetStyle (' paddingbottom ')) + ' px ';

};

return Val;

}: Function (name) {

Return getComputedStyle (Elem, NULL) [name];

},

MinHeight = parsefloat (GetStyle (' height '));

Elem.style.resize = ' None ';

var change = function () {

var scrolltop, height,

padding = 0,

style = Elem.style;

if (elem._length = = = Elem.value.length) return;

Elem._length = Elem.value.length;

if (!isfirefox &&!isopera) {

padding = parseint (GetStyle (' paddingtop ')) + parseint (GetStyle (' paddingbottom '));

};

scrolltop = Document.body.scrollTop | | Document.documentElement.scrollTop;

Elem.style.height = minheight + ' px ';
if (Elem.scrollheight > MinHeight) {

if (maxheight && elem.scrollheight > MaxHeight) {

Height = maxheight-padding;

Style.overflowy = ' auto ';

} else {

Height = elem.scrollheight-padding;

Style.overflowy = ' hidden ';

};

Style.height = height + extra + ' px ';

ScrollTop + = parseint (style.height)-elem.currheight;

Document.body.scrollTop = scrolltop;

Document.documentElement.scrollTop = scrolltop;

Elem.currheight = parseint (style.height);

};

};

Addevent (' PropertyChange ', change);

Addevent (' input ', change);

Addevent (' Focus ', change);

Change ();

};

</script>

<body>

<textarea id= "textarea" placeholder= "Reply to Content" ></textarea>

<script>

var text = document.getElementById ("textarea");

Autotextarea (text);//Call

</script>

</body>

HTML5 textarea text box Adaptive height based on input content

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

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