javascript - Dynamically set TextArea width

In Javascript TextArea How to set its width dynamically,

I tried with below code which works only for the last Id am passing as Argument.

Please help me to find what am doing Wrong.

<!DOCTYPE html>
<html>
<head>
<style type="text/css">
textarea {
    border : 1 black;
    overflow: hidden;
    padding: 0;
    outline: none;
    background-color: yellow;
    resize: none;
}
</style>
<script type="text/javascript">
var observe;
if (window.attachEvent) {
    observe = function (element, event, handler) {
        element.attachEvent('on'+event, handler);
    };
}
else {
    observe = function (element, event, handler) {
        element.addEventListener(event, handler, false);
    };
}
function loadTArea (ids) {
    for (var i = 0; i < ids.length; i++) {
        var text = document.getElementById(ids[i]);
        function resize () {
            text.style.height = 'auto';
            text.style.height = text.scrollHeight+'px';
        }

        /* 0-timeout to get the already changed text */
        function delayedResize () {
            window.setTimeout(resize, 0);
        }

        observe(text, 'change',  resize);
        observe(text, 'cut',     delayedResize);
        observe(text, 'paste',   delayedResize);
        observe(text, 'drop',    delayedResize);
        observe(text, 'keydown', delayedResize);
        text.focus();
        text.select();
        resize();
    }    
}
</script>
</head>
<body onload="loadTArea (['text1','text2']);">
<textarea rows="1" style="height:1em;" id="text1"> sadfa daf </textarea>
<textarea rows="1" style="height:1em;" id="text2"> sadfa daf </textarea>
</body>
</html>

In Javascript TextArea How to set its width dynamically,

I tried with below code which works only for the last Id am passing as Argument.

Please help me to find what am doing Wrong.

<!DOCTYPE html>
<html>
<head>
<style type="text/css">
textarea {
    border : 1 black;
    overflow: hidden;
    padding: 0;
    outline: none;
    background-color: yellow;
    resize: none;
}
</style>
<script type="text/javascript">
var observe;
if (window.attachEvent) {
    observe = function (element, event, handler) {
        element.attachEvent('on'+event, handler);
    };
}
else {
    observe = function (element, event, handler) {
        element.addEventListener(event, handler, false);
    };
}
function loadTArea (ids) {
    for (var i = 0; i < ids.length; i++) {
        var text = document.getElementById(ids[i]);
        function resize () {
            text.style.height = 'auto';
            text.style.height = text.scrollHeight+'px';
        }

        /* 0-timeout to get the already changed text */
        function delayedResize () {
            window.setTimeout(resize, 0);
        }

        observe(text, 'change',  resize);
        observe(text, 'cut',     delayedResize);
        observe(text, 'paste',   delayedResize);
        observe(text, 'drop',    delayedResize);
        observe(text, 'keydown', delayedResize);
        text.focus();
        text.select();
        resize();
    }    
}
</script>
</head>
<body onload="loadTArea (['text1','text2']);">
<textarea rows="1" style="height:1em;" id="text1"> sadfa daf </textarea>
<textarea rows="1" style="height:1em;" id="text2"> sadfa daf </textarea>
</body>
</html>

Share Improve this question edited Jun 10, 2013 at 10:30 Mr. Polywhirl 48.9k12 gold badges94 silver badges145 bronze badges asked Jun 10, 2013 at 10:24 Jericho 11k39 gold badges124 silver badges206 bronze badges

1 What are you trying to do? Your question is too localized, give us some context so that we can give you a general solution that other people can benefit from. SO is about questions and answers knowledge base, and your question in its current state hardly qualifies for a knowledge base. – Armen Michaeli Commented Jun 10, 2013 at 10:45
THANKS FOR ALL YOUR SUPPORT – Jericho Commented Jun 10, 2013 at 12:57

Add a ment |

2 Answers 2

Sorted by: Reset to default 3

have a look here: http://jsfiddle/8kqJH/

code

function loadTArea(ids) {
    for (var i = 0; i < ids.length; i++) {
        var text = document.getElementById(ids[i]);

        function resize(el) {                       //changes here
            el.style.height = 'auto';
            el.style.height = text.scrollHeight + 'px';
        }

        function delayedResize() {
            window.setTimeout(resize, 0);
        }
        observe(text, 'change', resize);
        observe(text, 'cut', delayedResize);
        observe(text, 'paste', delayedResize);
        observe(text, 'drop', delayedResize);
        observe(text, 'keydown', delayedResize);
        text.focus();
        text.select();
        resize(text);                  //changes here
    }
}

EDIT

To change textarea dinamycally while user types:

function resize:

function resizeTextarea(){
    this.style.height = 'auto';
    this.style.height = this.scrollHeight + 'px';
}

event binding:

document.getElementById("text1").onkeyup = resizeTextarea;
document.getElementById("text2").onkeyup = resizeTextarea;

OR, to apply to all textareas without specifying the ID

var text = document.getElementsByTagName("textarea");
for(var x = 0; x < text.length; x++)
    text[x].onkeyup = resizeTextarea;

working example: http://jsfiddle/LbMzD/3/

You need to pass the element you want to resize to your function:

var element = document.getElementById(ids[i]);

function resize(element) {
    element.style.height = value;
}

resize(element);

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javascript - Dynamically set TextArea width - Stack Overflow

2 Answers 2

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