jquery form object attribute filter selector instance analysis

jquery form object attribute filter selector instance analysis_jquery

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Release： 2016-05-16 15:58:42

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The example in this article describes the usage of jquery form object attribute filter selector. Share it with everyone for your reference. The specific analysis is as follows:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>表单对象属性过滤选择器</title>
<script src="jquery-1.6.2.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(function () {
 //=========举例1===========================
 //:enabled 用法: $(”input:enabled”) 返回值 集合元素
 //说明: 匹配所有可用元素.意思是查找所有input中不带有disabled=”disabled”的input.不为disabled,
 //当然就为enabled啦.
 $("input:enabled").val("我是有效的按钮");
 //=========举例2===========================
 //:disabled 用法: $(”input:disabled”) 返回值 集合元素
 //说明: 匹配所有不可用元素.与上面的那个是相对应的.
 $("input:disabled").val("我是无效的按钮");
 //=========举例3===========================
 //:checked 用法: $(”input:checked”) 返回值 集合元素
 //说明: 匹配所有选中的被选中元素(复选框、单选框等，不包括select中的option).这话说起来有些绕口.
 //...<1> 提取所有选中的name='love'的复选框
 $("#btnTest").click(function () {
 ShowElements($("input[name='love']:checked")); //第一种写法
 //ShowElements($("[name='love']:checked"))  //第二种写法
 });
 //=========举例4===========================
 //:selected 用法: $(”select option:selected”) 返回值 集合元素
 //说明: 匹配所有选中的option元素.
 //...<1> 所有name='city'的下拉框的选中项
 $("#btnTest2").click(function () {
  ShowElements($("select[name='city'] option:selected"));
 });
 //...<2> 所有name='prov'的下拉框的选中项
 //$("#btnTest2").click(function () {
 // ShowElements($("select[name='prov'] option:selected"));
 //});
});
function ShowElements(arr) {
 //alert(arr.length);
 var output = "";
 for (var i = 0; i < arr.length; i++) {
  if (output == "") {
   output = arr.eq(i).val();
  }
  else {
   output += "," + arr.eq(i).val();
  }
 }
 alert(output);
}
</script>
</head>
<body>
<input type="button" disabled="disabled" value="button1" />
<input type="button" value="button2" />
<input type="button" value="button3" />
<input type="button" disabled="disabled" value="button4" />
<input type="button" id="btnTest" value="点击我检查复选框" />
<input type="checkbox" name="love" value="1" />足球
<input type="checkbox" name="love" value="2" />篮球
<input type="checkbox" name="love" value="3" />排球
<input type="checkbox" name="Other" value="3" />非爱好类<br />
我是下拉框<input type="button" id="btnTest2" value="点击我检查下拉框" />
<select name="city">
<option value='beijing'>北京</option>
<option value='shanghai'>上海</option>
<option value='shenzhen'>深圳</option>
</select>
<select name="prov">
<option value='jiangxi'>江西省</option>
<option value='shichuan'>四川省</option>
<option value='guangdong'>广东省</option>
</select>
</body>
</html>

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