Textarea Auto height [duplicate]

问题:

This question already has an answer here:

• Creating a textarea with auto-resize 35 answers

I want to make height of textarea equal to height of the text within it (And remove the scroll bar)

HTML

<textarea id="note">SOME TEXT</textarea>

CSS

textarea#note {
    width:100%;
    direction:rtl;
    display:block;
    max-width:100%;
    line-height:1.5;
    padding:15px 15px 30px;
    border-radius:3px;
    border:1px solid #F7E98D;
    font:13px Tahoma, cursive;
    transition:box-shadow 0.5s ease;
    box-shadow:0 4px 6px rgba(0,0,0,0.1);
    font-smoothing:subpixel-antialiased;
    background:linear-gradient(#F9EFAF, #F7E98D);
    background:-o-linear-gradient(#F9EFAF, #F7E98D);
    background:-ms-linear-gradient(#F9EFAF, #F7E98D);
    background:-moz-linear-gradient(#F9EFAF, #F7E98D);
    background:-webkit-linear-gradient(#F9EFAF, #F7E98D);
}

JsFiddle: http://jsfiddle.net/Tw9Rj/

回答1:

It can be achieved using JS. Here is a 'one-line' solution using elastic.js:

$('#note').elastic();

Updated: Seems like elastic.js is not there anymore, but if you are looking for an external library, I can recommend autosize.js by Jack Moore. This is the working example:

autosize(document.getElementById("note"));

textarea#note {
	width:100%;
	box-sizing:border-box;
	direction:rtl;
	display:block;
	max-width:100%;
	line-height:1.5;
	padding:15px 15px 30px;
	border-radius:3px;
	border:1px solid #F7E98D;
	font:13px Tahoma, cursive;
	transition:box-shadow 0.5s ease;
	box-shadow:0 4px 6px rgba(0,0,0,0.1);
	font-smoothing:subpixel-antialiased;
	background:linear-gradient(#F9EFAF, #F7E98D);
	background:-o-linear-gradient(#F9EFAF, #F7E98D);
	background:-ms-linear-gradient(#F9EFAF, #F7E98D);
	background:-moz-linear-gradient(#F9EFAF, #F7E98D);
	background:-webkit-linear-gradient(#F9EFAF, #F7E98D);
}

<script src="https://rawgit.com/jackmoore/autosize/master/dist/autosize.min.js"></script>
<textarea id="note">Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex ea commodo consequat. Duis autem vel eum iriure dolor in hendrerit in vulputate velit esse molestie consequat, vel illum dolore eu feugiat nulla facilisis at vero eros et accumsan et iusto odio dignissim qui blandit praesent luptatum zzril delenit augue duis dolore te feugait nulla facilisi.</textarea>

Check this similar topics too:

Autosizing textarea using Prototype

Textarea to resize based on content length

Creating a textarea with auto-resize

回答2:

This using Pure JavaScript Code.

function auto_grow(element) {
    element.style.height = "5px";
    element.style.height = (element.scrollHeight)+"px";
}

textarea {
    resize: none;
    overflow: hidden;
    min-height: 50px;
    max-height: 100px;
}

<textarea onkeyup="auto_grow(this)"></textarea>

回答3:

For those of us accomplishing this with Angular, I used a directive

HTML:

<textarea elastic ng-model="someProperty"></textarea>

JS:

.directive('elastic', [
    '$timeout',
    function($timeout) {
        return {
            restrict: 'A',
            link: function($scope, element) {
                $scope.initialHeight = $scope.initialHeight || element[0].style.height;
                var resize = function() {
                    element[0].style.height = $scope.initialHeight;
                    element[0].style.height = "" + element[0].scrollHeight + "px";
                };
                element.on("input change", resize);
                $timeout(resize, 0);
            }
        };
    }
]);

$timeout queues an event that will fire after the DOM loads, which is what's necessary to get the right scrollHeight (otherwise you'll get undefined)

回答4:

I used jQuery AutoSize. When I tried using Elastic it frequently gave me bogus heights (really tall textarea's). jQuery AutoSize has worked well and hasn't had this issue.

回答5:

I see that this is answered already, but I believe I have a simple jQuery solution ( jQuery is not even really needed; I just enjoy using it ):

I suggest counting the line breaks in the textarea text and setting the rows attribute of the textarea accordingly.

var text = jQuery('#your_textarea').val(),
    // look for any "\n" occurences
    matches = text.match(/\n/g),
    breaks = matches ? matches.length : 2;

jQuery('#your_textarea').attr('rows',breaks + 2);

回答6:

Jsfiddle

textarea#note {
    width:100%;
    direction:rtl;
    display:block;
    max-width:100%;
    line-height:1.5;
    padding:15px 15px 30px;
    border-radius:3px;
    border:1px solid #F7E98D;
    font:13px Tahoma, cursive;
    transition:box-shadow 0.5s ease;
    box-shadow:0 4px 6px rgba(0,0,0,0.1);
    font-smoothing:subpixel-antialiased;
    background:-o-linear-gradient(#F9EFAF, #F7E98D);
    background:-ms-linear-gradient(#F9EFAF, #F7E98D);
    background:-moz-linear-gradient(#F9EFAF, #F7E98D);
    background:-webkit-linear-gradient(#F9EFAF, #F7E98D);
    background:linear-gradient(#F9EFAF, #F7E98D);
    height:100%;
}
html{
    height:100%;
}
body{

   height:100%;    
}

or javascript

var s_height = document.getElementById('note').scrollHeight;
document.getElementById('note').setAttribute('style','height:'+s_height+'px');

Jsfiddle

回答7:

var minRows = 5;
var maxRows = 26;
function ResizeTextarea(id) {
    var t = document.getElementById(id);
    if (t.scrollTop == 0)   t.scrollTop=1;
    while (t.scrollTop == 0) {
        if (t.rows > minRows)
                t.rows--; else
            break;
        t.scrollTop = 1;
        if (t.rows < maxRows)
                t.style.overflowY = "hidden";
        if (t.scrollTop > 0) {
            t.rows++;
            break;
        }
    }
    while(t.scrollTop > 0) {
        if (t.rows < maxRows) {
            t.rows++;
            if (t.scrollTop == 0) t.scrollTop=1;
        } else {
            t.style.overflowY = "auto";
            break;
        }
    }
}

回答8:

html

<textarea id="wmd-input" name="md-content"></textarea>

js

var textarea = $('#wmd-input'),
    top = textarea.scrollTop(),
    height = textarea.height();
    if(top > 0){
       textarea.css("height",top + height)
    }

css

#wmd-input{
    width: 100%;
    overflow: hidden;
    padding: 10px;
}