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

这是一个angularjs指令,用于panzi的答案。

 module.directive('autoHeight', function() {
        return {
            restrict: 'A',
            link: function(scope, element, attrs) {
                element = element[0];
                var resize = function(){
                    element.style.height = 'auto';
                    element.style.height = (element.scrollHeight)+'px';
                };
                element.addEventListener('change', resize, false);
                element.addEventListener('cut',    resize, false);
                element.addEventListener('paste',  resize, false);
                element.addEventListener('drop',   resize, false);
                element.addEventListener('keydown',resize, false);

                setTimeout(resize, 100);
            }
        };
    });

HTML:

<textarea ng-model="foo" auto-height></textarea>

其他回答

一个更简单、更清晰的方法是:

// adjust height of textarea.auto-height
$(document).on( 'keyup', 'textarea.auto-height', function (e){
    $(this).css('height', 'auto' ); // you can have this here or declared in CSS instead
    $(this).height( this.scrollHeight );
}).keyup();

//和CSS

textarea.auto-height {
    resize: vertical;
    max-height: 600px; /* set as you need it */
    height: auto;      /* can be set here of in JS */
    overflow-y: auto;
    word-wrap:break-word
}

所有需要做的就是将.auto-height类添加到您想要的目标文本区域。

在FF, Chrome和Safari测试。如果这对你不起作用,请告诉我,不管是什么原因。但是,这是我发现的最简单明了的方法。而且效果非常好!: D

改进的响应式纯JS解决方案,以@DreamTeK的第二个选项为基础

下面还处理了底部填充以及窗口大小的调整。像这样,这对我来说是一个近乎完美的解决方案。非常感谢他。

let textareas = document.getElementsByClassName("auto-resize-textarea"); // Loop through textareas and add event listeners as well as other needed css attributes for (const textarea of textareas) { // Initially set height as otherwise the textarea is not high enough on load textarea.style.height = textarea.scrollHeight.toString(); // Hide scrollbar textarea.style.overflowY = 'hidden'; // Call resize function with "this" context once during initialisation as it's too high otherwise resizeTextarea.call(textarea); // Add event listener to resize textarea on input textarea.addEventListener('input', resizeTextarea, false); // Also resize textarea on window resize event binding textarea to be "this" window.addEventListener('resize', resizeTextarea.bind(textarea), false); } function resizeTextarea() { // Textareas have default 2px padding and if not set it returns 0px let padding = window.getComputedStyle(this).getPropertyValue('padding-bottom'); // getPropertyValue('padding-bottom') returns "px" at the end it needs to be removed to be added to scrollHeight padding = parseInt(padding.replace('px','')); this.style.height = "auto"; this.style.height = (this.scrollHeight) + "px"; } textarea { width:40%; padding:20px 25px; border-radius: 20px; } <textarea class="auto-resize-textarea">Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua.</textarea> <textarea placeholder="Type, paste, cut text here..." class="auto-resize-textarea"></textarea>

注意:jsfiddle有一个奇怪的问题,文本区域太高,底部有太多的空间,但是复制和粘贴这段代码到一个空的html文件是完美的。

有一个小问题,但当滚动条出现在页面和文本区域收缩和包装文本,并创建一个新的行。上面的函数没有考虑到这一点,我提出了一个问题,但似乎没有人知道解决办法。如果你有解决这个问题的建议,我将非常高兴。

这是一个angularjs指令,用于panzi的答案。

 module.directive('autoHeight', function() {
        return {
            restrict: 'A',
            link: function(scope, element, attrs) {
                element = element[0];
                var resize = function(){
                    element.style.height = 'auto';
                    element.style.height = (element.scrollHeight)+'px';
                };
                element.addEventListener('change', resize, false);
                element.addEventListener('cut',    resize, false);
                element.addEventListener('paste',  resize, false);
                element.addEventListener('drop',   resize, false);
                element.addEventListener('keydown',resize, false);

                setTimeout(resize, 100);
            }
        };
    });

HTML:

<textarea ng-model="foo" auto-height></textarea>

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>

如果你不需要支持IE8,你可以使用input事件:

var resizingTextareas = [].slice.call(document.querySelectorAll('textarea[autoresize]'));

resizingTextareas.forEach(function(textarea) {
  textarea.addEventListener('input', autoresize, false);
});

function autoresize() {
  this.style.height = 'auto';
  this.style.height = this.scrollHeight+'px';
  this.scrollTop = this.scrollHeight;
  window.scrollTo(window.scrollLeft,(this.scrollTop+this.scrollHeight));
}

现在你只需要添加一些CSS,你就完成了:

textarea[autoresize] {
  display: block;
  overflow: hidden;
  resize: none;
}

用法:

<textarea autoresize>Type here and I’ll resize.</textarea>

你可以在我的博客文章中阅读更多关于它是如何工作的。