Detailed explanation of select operation instance method in jQuery

jQueryGet the Text and Value selected by Select:

Syntax explanation:
1. $("#select_id").change(function( ){//code...}); //Add an event for Select, which is triggered when one of the items is selected
2. var checkText=$("#select_id").find("option:selected"). text(); //Get the Text selected by Select
3. var checkValue=$("#select_id").val(); //Get the Value selected by Select
4. var checkIndex=$("# select_id ").get(0).selectedIndex; //Get the indexvalue
5 of Select. var maxIndex=$("#select_id option:last").attr("index") ; //Get the maximum index value of Select
jQuery sets the Text and Value selected by Select:
Syntax explanation:
1. $("#select_id ").get(0) .selectedIndex=1; //Set the item with Select index value to 1 to select
2. $("#select_id ").val(4); //Set the item with Select Value to 4 to select
3 . $("#select_id option[text='jQuery']").attr("selected", true); //Set the Text value of Select to the jQuery item selected
jQuery adds/delete Select Option item:
Syntax explanation:
1. $("#select_id").append("Text"); //For Select Append an Option (drop-down item)
2. $("#select_id").prepend("Please select"); //Insert an Option for Select (First position)
3. $("#select_id option:last").remove(); //Delete the Option with the largest index value in Select (the last one)
4. $("#select_id option [index='0']").remove(); //Delete the Option (first one) with index value 0 in Select
5. $("#select_id option[value='3']") .remove(); //Delete the Option with Value='3' in Select
5. $("#select_id option[text='4']").remove(); //Delete Text=' in Select 4' Option

//Traverse options and add and remove options

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]")); 
} 
}

//Get the selection value of the drop-down menu

$(#testSelect option:selected').text(); 
或$("#testSelect").find('option:selected').text(); 
或$("#testSelect").val();

/////////////////////////////////////////////////// ///////////////////
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 that it has the name attribute,
And the attribute value is the option element with the selected attribute in the select element of 'country';
It can be seen that the one starting with @ means the following Followed by attributes.
2, Radio button:

$("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",'checked'); //设置单选框value=2的为选中状态.(注意中间没有空格)

3,Check box:

$("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",'');//不打勾 
$("#chk2").attr("checked",true);//打勾 
if($("#chk1").attr('checked')==undefined){} //判断是否已经打勾

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
$("1111 2222").appendTo("#sel")//添加下拉框的option
$("#sel").empty()；//清空下拉框

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