Question

在Javascript TextArea中如何动态设置其宽度，

我尝试使用下面的代码，该代码仅适用于作为参数传递的最后一个Id。

请帮我找一下做错的事。

<!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>

Answer 1

看看这里：http://jsfiddle.net/8kqJH/

<强>码

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
    }
}

修改

在用户输入时以dinamycally方式更改textarea：

功能调整大小：

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

事件绑定：

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

或者，在不指定ID的情况下申请所有textareas

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

工作示例：http://jsfiddle.net/LbMzD/3/

Answer 2

您需要将要调整大小的元素传递给您的函数：

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

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

resize(element);

动态设置TextArea宽度

2 个答案: