还有另一个关于这个的帖子,我试过了。但有一个问题:如果你删除内容,文本区域不会缩小。我找不到任何方法将其缩小到正确的大小- clientHeight值返回为文本区域的完整大小,而不是它的内容。

该页面的代码如下:

function FitToContent(id, maxHeight)
{
   var text = id && id.style ? id : document.getElementById(id);
   if ( !text )
      return;

   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";
   }
}

window.onload = function() {
    document.getElementById("ta").onkeyup = function() {
      FitToContent( this, 500 )
    };
}

当前回答

有人觉得满意吗?没有混乱的滚动,和唯一的JS我喜欢关于它是如果你计划在模糊保存数据…显然,它在所有流行的浏览器上都是兼容的:http://caniuse.com/#feat=contenteditable

只要把它设置成文本框的样式,它就会自动调整大小……将它的最小高度设置为首选文本高度。

这种方法的最酷之处在于,您可以在某些浏览器上保存和标记。

http://jsfiddle.net/gbutiri/v31o8xfo/

var _auto_value = ''; $(document).on('blur', '.autosave', function(e) { var $this = $(this); if ($this.text().trim() == '') { $this.html(''); } // The text is here. Do whatever you want with it. $this.addClass('saving'); if (_auto_value !== $this.html() || $this.hasClass('error')) { // below code is for example only. $.ajax({ url: '/echo/json/?action=xyz_abc', data: 'data=' + $this.html(), type: 'post', datatype: 'json', success: function(d) { console.log(d); $this.removeClass('saving error').addClass('saved'); var k = setTimeout(function() { $this.removeClass('saved error') }, 500); }, error: function() { $this.removeClass('saving').addClass('error'); } }); } else { $this.removeClass('saving'); } }).on('focus mouseup', '.autosave', function() { var $this = $(this); if ($this.text().trim() == '') { $this.html(''); } _auto_value = $this.html(); }).on('keyup', '.autosave', function(e) { var $this = $(this); if ($this.text().trim() == '') { $this.html(''); } }); body { background: #3A3E3F; font-family: Arial; } label { font-size: 11px; color: #ddd; } .autoheight { min-height: 16px; font-size: 16px; margin: 0; padding: 10px; font-family: Arial; line-height: 20px; box-sizing: border-box; -o-box-sizing: border-box; -moz-box-sizing: border-box; -webkit-box-sizing: border-box; overflow: hidden; display: block; resize: none; border: 0; outline: none; min-width: 200px; background: #ddd; max-height: 400px; overflow: auto; } .autoheight:hover { background: #eee; } .autoheight:focus { background: #fff; } .autosave { -webkit-transition: all .2s; -moz-transition: all .2s; transition: all .2s; position: relative; float: none; } .autoheight * { margin: 0; padding: 0; } .autosave.saving { background: #ff9; } .autosave.saved { background: #9f9; } .autosave.error { background: #f99; } .autosave:hover { background: #eee; } .autosave:focus { background: #fff; } [contenteditable=true]:empty:before { content: attr(placeholder); color: #999; position: relative; top: 0px; /* For IE only, do this: position: absolute; top: 10px; */ cursor: text; } <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <label>Your Name</label> <div class="autoheight autosave contenteditable" contenteditable="true" placeholder="Your Name"></div>

其他回答

对于Angular 2+,就这么做

<textarea (keydown)="resize($event)"></textarea>


resize(e) {
    setTimeout(() => {
      e.target.style.height = 'auto';
      e.target.style.height = (e.target.scrollHeight)+'px';
    }, 0);
  }

textarea {
  resize: none;
  overflow: hidden;
}

jQuery的解决方案是设置文本区域的高度为'auto',检查scrollHeight,然后调整文本区域的高度,每次文本区域改变(JSFiddle):

$('textarea').on( 'input', function(){
    $(this).height( 'auto' ).height( this.scrollHeight );
});

如果你在动态添加文本区域(通过AJAX或其他方式),你可以在$(document)中添加这个。准备好确保所有带有类'autoheight'的文本区域保持与它们的内容相同的高度:

$(document).on( 'input', 'textarea.autoheight', function() {
    $(this).height( 'auto' ).height( this.scrollHeight );
});

测试和工作在Chrome, Firefox, Opera和IE。还支持剪切和粘贴,长字等。

我对多个文本区域使用了以下代码。在Chrome 12, Firefox 5和IE 9中工作良好,即使在文本区域执行删除,剪切和粘贴操作。

function attachAutoResizeEvents() { for (i = 1; i <= 4; i++) { var txtX = document.getElementById('txt' + i) var minH = txtX.style.height.substr(0, txtX.style.height.indexOf('px')) txtX.onchange = new Function("resize(this," + minH + ")") txtX.onkeyup = new Function("resize(this," + minH + ")") txtX.onchange(txtX, minH) } } function resize(txtX, minH) { txtX.style.height = 'auto' // required when delete, cut or paste is performed txtX.style.height = txtX.scrollHeight + 'px' if (txtX.scrollHeight <= minH) txtX.style.height = minH + 'px' } window.onload = attachAutoResizeEvents textarea { border: 0 none; overflow: hidden; outline: none; background-color: #eee } <textarea style='height:100px;font-family:arial' id="txt1"></textarea> <textarea style='height:125px;font-family:arial' id="txt2"></textarea> <textarea style='height:150px;font-family:arial' id="txt3"></textarea> <textarea style='height:175px;font-family:arial' id="txt4"></textarea>

$('textarea').bind('keyup change', function() {
    var $this = $(this), $offset = this.offsetHeight;
    $offset > $this.height() && $offset < 300 ?
        $this.css('height ', $offset)
            .attr('rows', $this.val().split('\n').length)
            .css({'height' : $this.attr('scrollHeight'),'overflow' : 'hidden'}) :
        $this.css('overflow','auto');
});

jQuery的解决方案 请根据实际情况调整CSS

css……

div#container textarea {
    min-width: 270px;
    width: 270px;
    height: 22px;
    line-height: 24px;
    min-height: 22px;
    overflow-y: hidden; /* fixes scrollbar flash - kudos to @brettjonesdev */
    padding-top: 1.1em; /* fixes text jump on Enter keypress */
}

javascript……

// auto adjust the height of
$('#container').delegate( 'textarea', 'keydown', function (){
    $(this).height( 0 );
    $(this).height( this.scrollHeight );
});
$('#container').find( 'textarea' ).keydown();

或替代jQuery 1.7+…

// auto adjust the height of
$('#container').on( 'keyup', 'textarea', function (){
    $(this).height( 0 );
    $(this).height( this.scrollHeight );
});
$('#container').find( 'textarea' ).keyup();

我已经创建了一个具有绝对最小样式的小提琴作为您的实验的起点…… http://jsfiddle.net/53eAy/951/