1 <!DOCTYPE html>
2 <html>
3 <head>
4 <style>
5 body, select { font-size:14px; }
6 form { margin:5px; }
7 p { color:red; margin:5px; }
8 b { color:blue; }
9 </style>
10 <script src="http://code.jquery.com/jquery-latest.js"></script>
11 </head>
12 <body>
13 <p><b>Results:</b> <span id="results"></span></p>
14
15 <form>
16 <select name="single">
17 <option>Single</option>
18 <option>Single2</option>
19
20 </select>
21 <select name="multiple" multiple="multiple">
22 <option selected="selected">Multiple</option>
23 <option>Multiple2</option>
24
25 <option selected="selected">Multiple3</option>
26 </select><br/>
27 <input type="checkbox" name="check" value="check1" id="ch1"/>
28
29 <label for="ch1">check1</label>
30 <input type="checkbox" name="check" value="check2" checked="checked" id="ch2"/>
31
32 <label for="ch2">check2</label>
33 <input type="radio" name="radio" value="radio1" checked="checked" id="r1"/>
34
35 <label for="r1">radio1</label>
36 <input type="radio" name="radio" value="radio2" id="r2"/>
37
38 <label for="r2">radio2</label>
39 </form>
40 <script>
41 function showValues() {
42 var fields = $(":input").serializeArray();
43 $("#results").empty();
44 jQuery.each(fields, function(i, field){
45 $("#results").append(field.value + " ");
46 });
47 }
48
49 $(":checkbox, :radio").click(showValues);
50 $("select").change(showValues);
51 showValues();
52 </script>
53
54 </body>
55 </html> 从表单获取值,遍历并将其显示出来
:input:选择所有 input, textarea, select 和 button 元素.
$(':checkbox') 等同于 $('[type=checkbox]')。如同其他伪类选择器(那些以“:”开始)建议前面加上一个标记名称或其他选择器;否则,默认使用通用选择("*")。换句话说$(':checkbox') 等同于 $('*:checkbox'),所以应该使用$('input:checkbox')来提升效率。
$(':radio')等价于$('[type=radio]')。如同其他伪类选择器(那些以“:”开始),建议使用此类选择器时,跟在一个标签名或者其它选择器后面,默认使用了全局通配符选择器 "*"。换句话说$(':radio') 等同于 $('*:radio'),所以应该使用$('input:radio')。
jQuery.each( collection, callback(indexInArray, valueOfElement) )
一个通用的迭代函数,它可以用来无缝迭代对象和数组。数组和类似数组的对象通过一个长度属性(如一个函数的参数对象)来迭代数字索引,从0到length - 1。其他对象通过其属性名进行迭代。$.each([52, 97], function(index, value) {
alert(index + ': ' + value);
});
//1:52
//1:97
var obj = {
"flammable": "inflammable",
"duh": "no duh"
};
$.each( obj, function( key, value ) {
alert( key + ": " + value );
});
//flammable: inflammable
//duh: no duh
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>jQuery.each demo</title>
<style>
div {
color: blue;
}
div#five {
color: red;
}
</style>
<script src="http://code.jquery.com/jquery-1.9.1.js"></script>
</head>
<body>
<div ></div>
<div ></div>
<div ></div>
<div ></div>
<div ></div>
<script>
var arr = [ "one", "two", "three", "four", "five" ];
var obj = { one: 1, two: 2, three: 3, four: 4, five: 5 };
jQuery.each( arr, function( i, val ) {
$( "#" + val ).text( "Mine is " + val + "." );
// Will stop running after "three"
return ( val !== "three" );
});
jQuery.each( obj, function( i, val ) {
$( "#" + i ).append( document.createTextNode( " - " + val ) );
});
</script>
</body>
</html> Mine is one. - 1
Mine is two. - 2
Mine is three. - 3
- 4
- 5
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