JavaScript getElementByName 不起作用
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JavaScript getElementByName doesn't work
提问by Philip007
This simple JS can't set the value of "para". I guess getElementByName doesn't work. But why?
这个简单的JS无法设置“para”的值。我猜 getElementByName 不起作用。但为什么？
<script>
function fn()
{
document.getElementById("para").setAttribute("name","hi");
document.getElementByName("hi").setAttribute("value","my value is high");
}
</script>
HTML:
HTML：
<input type="button" onClick="fn()" value="click me">
<input id="para" type="text" />
回答by Matthew Flaschen
It's getElementsByName. Note the plural. It returns an array-like NodeList of elements with that nameattribute.
它是getElementsByName。注意复数。它返回具有该name属性的元素的类似数组的 NodeList 。
回答by Wrikken
getElementsByNameexists, which returns a collection of the elements. If you plan to find only one:
getElementsByName存在，它返回元素的集合。如果您打算只找到一个：
document.getElementsByName("hi")[0].setAttribute("value", "my value is high");
Edit: a, HTML there (didn't see that before the edit). No 'hi' element in HTML, possibly in some XML format there is...
编辑：a，HTML 那里（在编辑之前没有看到）。HTML 中没有 'hi' 元素，可能在某些 XML 格式中有...
回答by Jeaf Gilbert
not getElementByNamebut getElementsByName, and it returns array.
not getElementByNamebut getElementsByName，它返回数组。
<html>
<head>
<script language="javascript">
function fn() {
document.getElementById("para").setAttribute("name","hi");
x = document.getElementsByName("hi");
x[0].setAttribute("value","my value is high");
}
</script>
</head>
<body onload="fn()">
<input type="text" id="para" />
</body>
</html>
回答by Philip007
Also, i find that document type must be declared to make getelementsbyname work.
另外，我发现必须声明文档类型才能使 getelementsbyname 工作。
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
