jquery gets the value in the form element sample code_jquery

jquery notes:

The things on the Internet are too messy , and different versions of jQuery may be written differently. After searching and doing experiments, what is written below is the
jquery radio value, checkbox value, select value, radio selected, checkbox selected, under jQuery 1.3.2 version. select, and its related settings:
Get the value of a set of radio selected items: var item = $('input[name=items][checked]').val();

Get selectThe text of the selected item
var item = $("select[@name=items] option[@selected]").text();
Get the text of the selected item: var item = $( "select[name=items] option[selected]").text(); or
$("select[name=items]").find("option:selected").text();
The second element of the select drop-down box is the currently selected value: $('#select_id')[0].selectedIndex = 1;
The element of the select drop-down box value = 'val' is the currently selected item: $("select [name=items] option[value='val']").attr("selected","selected");
The second element of the radio radio selection group is the currently selected item: $('input[@ name=items]').get(1).checked = true; or $('input[name=items]').attr("checked",1′);
radio value = 'val' The element is the currently selected item: $('input[name=items][value='val']').attr("checked","checked");
Get the value:
Text box, text area :$("#txt").attr("value");
Multiple selection box checkbox: $("input[name='checkbox':checked]").each(function(){
var val = $(this).val();
});
Radio selection group radio: $("input[type=radio][checked]").val();
Drop-down box select value: $('select').val();
Text value selected by drop-down box select: $("select").find("option:selected").text();

Control form elements:
Text box, text area: $("#txt").attr("value","); //Clear content
$("#txt").attr(" value”,’11′); //Fill content
Multiple selection box checkbox: The second element of
checkbox is checked: $("input[name=items]").get(1). checked = true; //Check
$("input[name=items]").get(1).checked = false; //Uncheck
before the element with value='val' in checkbox Tick: $("input[name=item][value='val']").attr("checked",true); or $("input[name=item][value='val']") .attr("checked","checked");
if($("input[name=item][value='val']").attr('checked')==true) //Determine whether Already checked
radio group radio: $("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
$(”1111$("#text_id").focus(function(){//code...}); //The event is triggered when the object text_id gets focus
$("#text_id ").blur(function(){//code...}); //The event is triggered when the object text_id loses focus
$("#text_id").select(); //Make the Vlaue of the text box The value becomes selected
$("input[name='radio_name'][value='Value of Radio to be selected'").
attr("checked",true); //Set according to Value Radio is in the selected state

jQuery gets the Value value selected by CheckBox
$("input[name='checkbox_name'][checked]"); //Select the collection of selected CheckBox elements if you want to get the Value Value you need to iterate through this collection
$($("input[name='checkbox_name'][checked]")).
each(function(){arrChk =this.value ',';}); //Traverse the collection of selected CheckBox elements to get the Value value
$("#checkbox_id").attr("checked"); //Get the status of a CheckBox (whether it is selected, return true/false)
$("#checkbox_id").attr("checked",true); //Set the status of a CheckBox to checked (checked=true)
$("#checkbox_id").attr("checked",false ); //Set the status of a CheckBox to unchecked (checked=false)
$("input[name='checkbox_name']").attr
("checked",$("#checkbox_id") .attr("checked"));//According to items 3, 4, and 5, you can analyze the meaning of this code
$("#text_id").val().split(","); //Separate the Value value of Text with ',' and return an array
The above operations are actually the use of jQuery selector. I hope everyone has a solid knowledge of jQuery selector.