[英]Why this not working in JS?? getElementById().style.width += 40 + “px”;
I'm trying to write a shorthand method getElementById().style.width += 40 + "px"; 我正在尝试写一个简写方法getElementById()。style.width + = 40 +“ px”; for changing element width in DOM via JavasScript but it isn't working.
用于通过JavasScript更改DOM中的元素宽度,但无法正常工作。 Any working solutions to achieve that?
有什么可行的解决方案可以实现这一目标?
if document.getElementById(id).style.width
returns "10px"
如果
document.getElementById(id).style.width
返回"10px"
then document.getElementById(id).style.width += 40 + "px"
will be "10px40px"
然后
document.getElementById(id).style.width += 40 + "px"
将为"10px40px"
Shorthand assignment is not possible. 无法进行简写分配。 but you should try the following:
但是您应该尝试以下操作:
document.getElementById("div1").style.width = (parseInt(document.getElementById("div1").style.width) + 40) + "px";
Note: replace [id] with an appropriate id. 注意:用适当的ID替换[id]。
Full example code: 完整的示例代码:
<html>
<head>
<title></title>
<script type="text/javascript">
function incrementWidth() {
document.getElementById("div1").style.width = (parseInt(document.getElementById("div1").style.width) + 40) + "px";
}
</script>
</head>
<body>
<div id="div1" style="height:100px;width:40px;background-color:orange;"></div>
<button onclick="incrementWidth();">INCREMENT</button>
</body>
</html>
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