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HomeWeb Front-endJS TutorialDetailed introduction to jQuery select operation method

Detailed introduction to jQuery select operation method

Jun 19, 2017 pm 02:01 PM
jqueryselectintroduceoperatedetailed

jquery获取Select选择的Text和Value:
语法解释:

1. $("#select_id").change(function(){//code...}); //为Select添加事件,当选择其中一项时触发 2. var checkText=$("#select_id").find("option:selected").text(); //获取Select选择的Text 3. var checkValue=$("#select_id").val(); //获取Select选择的Value 4. var checkIndex=$("#select_id ").get(0).selectedIndex; //获取Select选择的索引值
5. var maxIndex=$("#select_id option:last").attr("index"); //获取Select最大的索引值

jQuery设置Select选择的Text和Value:
语法解释:

 1. $("#select_id ").get(0).selectedIndex=1; //设置Select索引值为1的项选中 
2. $("#select_id ").val(4); //设置Select的Value值为4的项选中 3. $("#select_id option[text='jQuery']").attr("selected", true); //设置Select的Text值为jQuery的项选中

jQuery添加/删除Select的Option项:
语法解释:
 

1. $("#select_id").append("<option value=&#39;Value&#39;>Text</option>"); //为Select追加一个Option(下拉项)
2. $("#select_id").prepend("<option value=&#39;0&#39;>请选择</option>"); //为Select插入一个Option(第一个位置) 3. $("#select_id option:last").remove(); //删除Select中索引值最大Option(最后一个) 4. $("#select_id option[index=&#39;0&#39;]").remove(); //删除Select中索引值为0的Option(第一个) 5. $("#select_id option[value=&#39;3&#39;]").remove(); //删除Select中Value=&#39;3&#39;的Option 5. $("#select_id option[text=&#39;4&#39;]").remove(); //删除Select中Text=&#39;4&#39;的Option
//遍历option和添加、移除option function changeShipMethod(shipping){ var len = $("select[@name=ISHIPTYPE] option").length if(shipping.value != "CA"){ $("select[@name=ISHIPTYPE] option").each(function(){ if($(this).val() == 111){ $(this).remove(); } }); }else{ $("<option value=&#39;111&#39;>UPS Ground</option>").appendTo($("select[@name=ISHIPTYPE]")); } }
//取得下拉选单的选取值 $(#testSelect option:selected&#39;).text(); 或$("#testSelect").find(&#39;option:selected&#39;).text(); 或$("#testSelect").val();

1,下拉框:

var cc1 = $(".formc select[@name=&#39;country&#39;] option[@selected]").text(); //得到下拉菜单的选中项的文本(注意中间有空格) 
var cc2 = $(&#39;.formc select[@name="country"]&#39;).val(); //得到下拉菜单的选中项的值 
var cc3 = $(&#39;.formc select[@name="country"]&#39;).attr("id"); //得到下拉菜单的选中项的ID属性值 $("#select").empty();//清空下拉框//$("#select").html(&#39;&#39;); $("<option value=&#39;1&#39;>1111</option>").appendTo("#select")//添加下拉框的option

解释:
1.select[@name='country'] option[@selected] 表示具有name 属性,
并且该属性值为'country' 的select元素 里面的具有selected 属性的option 元素;
可以看出有@开头的就表示后面跟的是属性。

2,单选框:

 $("input[@type=radio][@checked]").val(); //得到单选框的选中项的值(注意中间没有空格) 
$("input[@type=radio][@value=2]").attr("checked",&#39;checked&#39;); //设置单选框value=2的为选中状态.(注意中间没有空格)

3,复选框:

$("input[@type=checkbox][@checked]").val(); //得到复选框的选中的第一项的值 $("input[@type=checkbox][@checked]").each(function(){ //由于复选框一般选中的是多个,所以可以循环输出 alert($(this).val()); });
$("#chk1").attr("checked",&#39;&#39;);//不打勾 $("#chk2").attr("checked",true);//打勾 if($("#chk1").attr(&#39;checked&#39;)==undefined){} //判断是否已经打勾

当然jquery的选择器是强大的. 还有很多方法.

<script src="jquery-1.2.1.js" type="text/javascript"></script> 
<script language="javascript" type="text/javascript"> $(document).ready(function(){ $("#selectTest").change(function() { //alert("Hello"); //alert($("#selectTest").attr("name")); //$("a").attr("href","xx.html"); //window.location.href="xx.html"; //alert($("#selectTest").val()); alert($("#selectTest option[@selected]").text()); $("#selectTest").attr("value", "2");
}); }); </script> <a href="#">aaass</a>
<!--下拉框--> <select id="selectTest" name="selectTest"> <option value="1">11</option> <option value="2">22</option> <option value="3">33</option> <option value="4">44</option> <option value="5">55</option> <option value="6">66</option> </select>  
jquery radio取值,checkbox取值,select取值,radio选中,checkbox选中,select选中,及其相关获取一组radio被选中项的值 var item = $(&#39;input[@name=items][@checked]&#39;).val();

获取select被选中项的文本

 var item = $("select[@name=items] option[@selected]").text(); 
select下拉框的第二个元素为当前选中值 $(&#39;#select_id&#39;)[0].selectedIndex = 1; 
radio单选组的第二个元素为当前选中值 
$(&#39;input[@name=items]&#39;).get(1).checked = true;

获取值:
文本框,文本区域:$("#txt").attr("value");
多选框checkbox:$("#checkbox_id").attr("value");
单选组radio: $("input[@type=radio][@checked]").val();
下拉框select: $('#sel').val();
控制表单元素:
文本框,文本区域:$("#txt").attr("value",'');//清空内容
$("#txt").attr("value",'11');//填充内容
多选框checkbox: $("#chk1").attr("checked",'');//不打勾
$("#chk2").attr("checked",true);//打勾
if($("#chk1").attr('checked')==undefined) //判断是否已经打勾
单选组radio: $("input[@type=radio]").attr("checked",'2');//设置value=2的项目为当前选中项
下拉框select: $("#sel").attr("value",'-sel3');//设置value=-sel3的项目为当前选中项
$("1111 2222").appendTo("#sel")//添加下拉框的option
$("#sel").empty();//清空下拉框

获取一组radio被选中项的值
var item = $('input[@name=items][@checked]').val();
获取select被选中项的文本
var item = $("select[@name=items] option[@selected]").text();
select下拉框的第二个元素为当前选中值
$('#select_id')[0].selectedIndex = 1;
radio单选组的第二个元素为当前选中值
$('input[@name=items]').get(1).checked = true;
获取值:
文本框,文本区域:$("#txt").attr("value");
多选框checkbox:$("#checkbox_id").attr("value");
单选组radio: $("input[@type=radio][@checked]").val();
下拉框select: $('#sel').val();
控制表单元素:
文本框,文本区域:$("#txt").attr("value",'');//清空内容
$("#txt").attr("value",'11');//填充内容
多选框checkbox: $("#chk1").attr("checked",'');//不打勾
$("#chk2").attr("checked",true);//打勾
if($("#chk1").attr('checked')==undefined) //判断是否已经打勾
单选组radio: $("input[@type=radio]").attr("checked",'2');//设置value=2的项目为当前选中项
下拉框select:

$("#sel").attr("value",&#39;-sel3&#39;);//设置value=-sel3的项目为当前选中项 
$("<option value=&#39;1&#39;>1111</option><option value=&#39;2&#39;>2222</option>").appendTo("#sel")//添加下拉框的option $("#sel").empty();//清空下拉框

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