Summary of jQuery select operation control methods_jquery

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 of 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 index value selected by Select

5. var maxIndex=$("#select_id option:last").attr("index"); //Get the maximum index value of Select

jQuery sets the Text and Value of 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 to add/delete Select Option item:
Syntax explanation:
1. $("#select_id").append("Text"); //Append an Option (drop-down item) to Select
2. $("#select_id").prepend("Please select "); //Insert an Option (first position) for Select
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 with index value 0 in Select (the first one)
5. $("#select_id option[value='3']").remove(); //Delete the Option with Value='3' in Select
5. $("#select_id option[text='4']").remove(); //Delete the Option with Text='4' in Select


//Traverse options and add and remove 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{
$("UPS Ground").appendTo($("select[@name=ISHIPTYPE]" ));
}
}


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

$(#testSelect option:selected').text();
or $("#testSelect").find('option:selected').text();
or $("#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(); //Get the text of the selected item in the drop-down menu (note the space in the middle)
var cc2 = $('.formc select[@name="country"]' ).val(); //Get the value of the selected item in the drop-down menu
var cc3 = $('.formc select[@name="country"]').attr("id"); //Get the drop-down menu ID attribute value of the selected item in the menu
$("#select").empty();//Clear the drop-down box//$("#select").html('');
$(" 1111").appendTo("#select")//Add the option of the drop-down box

Explain a little:
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 an attribute.

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 is no space in the middle)

3, check box:
$("input[@type=checkbox][@checked]").val(); //Get the check box selected The value of the first item
$("input[@type=checkbox][@checked]").each(function(){ //Since multiple check boxes are generally selected, the output can be looped
alert($(this).val());
});

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


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






aaass



11
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55
66


jquery radio takes the value, checkbox takes the value Value, select value, radio selected, checkbox selected, select selected, and related to obtain the value of a set of radio selected items
var item = $('input[@name=items][@checked]'). val();
Get the text of the selected item in select
var item = $("select[@name=items] option[@selected]").text();
select the item of the drop-down box The two elements are the currently selected value
$('#select_id')[0].selectedIndex = 1;
The second element of the radio radio selection group is the currently selected value
$('input[@ name=items]').get(1).checked = true;
Get value:
Text box, text area: $("#txt").attr("value");
Multiple Checkbox: $("#checkbox_id").attr("value");
Radio group radio: $("input[@type=radio][@checked]").val();
Drop-down box select: $('#sel').val();
Control form element:
Text box, text area: $("#txt").attr("value",'') ;//Clear content
$("#txt").attr("value",'11');//Fill content
Multiple selection box checkbox: $("#chk1").attr(" checked",'');//Unchecked
$("#chk2").attr("checked",true);//Checked
if($("#chk1").attr ('checked')==undefined) //Determine whether the
radio group radio has been checked: $("input[@type=radio]").attr("checked",'2');// Set the item with value=2 as the currently selected item drop-down box select: $("#sel").attr("value",'-sel3');//Set the item with value=-sel3 as the currently selected item $("1111
2222
").appendTo("#sel")//Add the option of the drop-down box
$("#sel").empty( ); //Clear the drop-down box

Get the value of a set of radio selected items
var item = $('input[@name=items][@checked]').val();
Get the text of the selected item in select
var item = $("select[@name=items] option[@selected]").text();
The second element of the select drop-down box is the current Selected value
$('#select_id')[0].selectedIndex = 1;
The second element of the radio radio selection group is the currently selected value
$('input[@name=items]' ).get(1).checked = true;
Get value:
Text box, text area: $("#txt").attr("value");
Multiple selection box checkbox: $ ("#checkbox_id").attr("value");
Radio selection group radio: $("input[@type=radio][@checked]").val();
Drop-down box select: $('#sel').val();
Control form elements:
Text box, text area: $("#txt").attr("value",'');//Clear the content
$("#txt").attr("value",'11');//Fill content
Multiple selection box checkbox: $("#chk1").attr("checked",'' );//Unchecked
$("#chk2").attr("checked",true);//Checked
if($("#chk1").attr('checked') ==undefined) //Judge whether
radio group radio has been checked: $("input[@type=radio]").attr("checked",'2');//Set value=2 The item is the currently selected item drop-down box select: $("#sel").attr("value",'-sel3');//The item setting value=-sel3 is the currently selected item$( "1111
2222
").appendTo("#sel")//Add the option of the drop-down box
$("#sel").empty();//Clear Drop-down box
For more information, please refer to the following articles:Jquery Select Operation Method Collection Script House Special Edition