Summary of jQuery select operation control methods

It should be noted that a lot of the code here is for versions before jquery 1.32 (later versions no longer support @), so just replace it with empty code and test it.

jQuery gets the Text and Value selected by Select:
Syntax explanation:

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 sets the Text and Value selected by Select:
Glossary explanation:

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 adds/delete the Option item of Select:
Glossary explanation:

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();

/////////////////////////////////////////////////// ///////////////////
If you have a bad memory, you can save it:
1, drop-down box:

var cc1 = $(".formc select[@name='country'] 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 = $('.formc select[@name="country"]').val(); //得到下拉菜单的选中项的值 
var cc3 = $('.formc select[@name="country"]').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(''); 
$("<option value=&#39;1&#39;>1111</option>").appendTo("#select")//添加下拉框的option

A little explanation:
1.select[@name='country'] option[@selected] means the option element with the selected attribute in the select element that has the name attribute,
and the attribute value is 'country' ;
It can be seen that anything starting with @ means that it is followed by attributes.

2, Radio button:
$("input[@type=radio][@checked]").val(); //Get the value of the selected item of the radio button (note the middle No spaces)
$("input[@type=radio][@value=2]").attr("checked",'checked'); //Set the radio button value=2 to the selected state. (Note that there are no spaces in the middle)

3,Check box:
$("input[@type=checkbox][@checked]").val(); // Get the value of the first selected item of the check box
$("input[@type=checkbox][@checked]").each(function(){ //Because check boxes generally select multiple , so you can loop the output
alert($(this).val());
});

$("#chk1").attr("checked",''); //Uncheck
$("#chk2").attr("checked",true);//Check
if($("#chk1").attr('checked')== undefined){} //Judge whether it has been checked


Of course jquery's selector is powerful. There are many ways.

<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 = $('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",'-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",'-sel3');//设置value=-sel3的项目为当前选中项
$("11112222").appendTo("#sel")//添加下拉框的option
$("#sel").empty()；//清空下拉框

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