返回到：Prototype – 表单管理
此方法将键盘焦点提供给表单的第一个元素。
这有助于通过将页面加载重点放在用户准备立即开始输入的表单（例如搜索表单或联系表单）上来提高网站的可用性。
语法
form.focusFirstElement();
返回值
它返回 HTMLFormElement。
例子
HTML
x
44
44
1
<html>2
<head>3
<title>Prototype examples</title>4
<script type = "text/javascript" src = "/javascript/prototype.js"></script>5
6
<script>7
function showResult() {8
var form = $('example'); 9
form.focusFirstElement(); 10
}11
</script>12
</head>13
14
<body>15
<p>Click the button to see the result.</p>16
<br />17
18
<form id = "example" action = "#" onsubmit = "return false">19
<fieldset>20
<legend>User info</legend>21
<div>22
<label for = "username">Username:</label> 23
<input name = "username" id = "username" value = "Sulien" type = "text">24
</div>25
<div>26
<label for = "age">Age:</label> 27
<input name = "age" id = "age" value = "23" size = "3" type = "text">28
</div>29
<div>30
<label for = "hobbies">Your hobbies are:</label>31
<select name = "hobbies" id = "hobbies" multiple = "multiple">32
<option>coding</option>33
<option>swimming</option>34
<option>hiking</option>35
<option>drawing</option>36
</select>37
</div>38
</fieldset>39
</form>40
<br />41
42
<input type = "button" value = "Result" onclick = "showResult();"/>43
</body>44
</html>返回到：Prototype – 表单管理
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作者：terry，如若转载，请注明出处：https://www.web176.com/prototype_api/8520.html
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