Ajax jquery springmvc cascading dropdown box

function Initnetcode () {
var html = "";
$.ajax ({
Type: "Post",
Async:false,
URL: "User/inituserform.do",
Data: "Method=getprovince",
DataType: "JSON",
Success:function (data) {
if (data!= 0) {
var temp = eval (data);
for (var i = 0; i < temp.length; i++) {
HTML + + "<option value= '" + Temp[i].netid + "' >" + temp[i].netcode + "</option>";
}
}
else {
HTML = "<option> network exception </option>";
}
}
});
alert (HTML);
$ (HTML). Appendto ("#f_netCode")
}

jquery to select operation

/traverse option and Add, 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{
$ ("<optionvalue= ' >UPSGround</option>"). Appendto ($ ("select[@name =ishiptype]"));
}
}

Get the selected value of the dropdown menu

$ (#testSelect option:selected '). Text ();
or $ ("#testSelect"). Find (' option:selected '). Text ();
or $ ("#testSelect"). Val ();
//////////////////////////////////////////////////////////////////
A bad memory can be collected:
1, dropdown box:

var cc1 = $ (". formcselect[@name = ' country '] option[@selected]"). Text ()//(Note the space in the middle) for the selected item of the Drop-down menu.
var CC2 = $ ('. formcselect[@name = ' country '] '). Val (); Gets the value of the selected item in the Drop-down menu
var cc3 = $ ('. FORMC select[@name = ' country '] '). attr ("id")//Get the id attribute value of the selected item of the Drop-down menu
$ ("#select"). Empty ()//Empty Drop-down box//$ ("#select"). HTML (");
$ ("<optionvalue= ' 1 ' >1111</option>"). Appendto ("#select")//option to add a drop-down box

A little explanation:
1.select[@name = ' country '] option[@selected] Represents the Name property,
and the attribute value is the option element with the selected attribute inside the Select element of ' country ';
It can be seen that a @ begins with a property that follows.

2, Radio Box:
$ ("input[@type =radio][@checked]"). Val (); Gets the value of the selected item in the Radio box (note that there are no spaces in the middle)
$ ("input[@type =radio][@value =2]"). attr ("Checked", ' checked ');//Set the Radio box to the selected state value=2. (Note that there are no spaces in between)

3, check box:
$ ("input[@type =checkbox][@checked]"). Val (); Gets the value of the first item selected in the check box
$ ("input[@type =checkbox][@checked]"). each (function () {//, because the check box is typically selected for more than one, you can cycle the output
Alert ($ (this). Val ());
});

$ ("#chk1"). attr ("Checked", "");/no tick.
$ ("#chk2"). attr ("Checked", true);/tick
if ($ ("#chk1"). attr (' checked ') ==undefined) {}//judge whether it has been ticked

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

<ahref= "#" >aaass</a>

<!--dropdown box-->
<select id= "Selecttest" name= "Selecttest" >
<optionvalue= "1" >11</option>
<optionvalue= "2" >22</option>
<optionvalue= "3" >33</option>
<optionvalue= "4" >44</option>
<optionvalue= "5" >55</option>
<optionvalue= "6" >66</option>
</select>
Jqueryradio value, checkbox value, select Value, Radio selected, CheckBox selected, select selected, and related to get a set of radio selected values
var item = $ (' input[@name =items][@checked] '). Val ();
Gets the text of the Select selected item
var item = $ ("select[@name =items] option[@selected]"). Text ();
The second element of the Select Drop-down box is the currently selected value
$ (' #select_id ') [0].selectedindex = 1;
Radio the second element of a radio 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 Group Radio: $ ("input[@type =radio][@checked]"). Val ();
Dropdown box Select: $ (' #sel '). Val ();
Control form elements:
text box, text area: $ ("#txt"). attr ("Value", "");/empty content
$ ("#txt"). attr ("value", ' 11 ');//fill content
Multi-Marquee checkbox: $ ("#chk1"). attr ("Checked", "");/no tick.
$ ("#chk2"). attr ("Checked", true);/tick
if ($ ("#chk1"). attr (' checked ') ==undefined)//judge whether it has been ticked
Radio Group radio:$ ("input[@type =radio]"). attr ("Checked", ' 2 ');//Set value=2 project is currently selected
Drop-down box select:$ ("#sel"). attr ("value", '-sel3 ');//Set VALUE=-SEL3 item as current selected
$ ("<optionvalue= ' 1 ' >1111</option><optionvalue= ' 2 ' >2222</option>"). Appendto ("#sel")// Option to add a drop-down box
$ ("#sel"). empty ();//Empty Drop-down box

Gets the value of a set of radio selected items
var item = $ (' input[@name =items][@checked] '). Val ();
Gets the text of the Select selected item
var item = $ ("select[@name =items] option[@selected]"). Text ();
The second element of the Select Drop-down box is the currently selected value
$ (' #select_id ') [0].selectedindex = 1;
Radio the second element of a radio 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 Group Radio: $ ("input[@type =radio][@checked]"). Val ();
Dropdown box Select: $ (' #sel '). Val ();
Control form elements:
text box, text area: $ ("#txt"). attr ("Value", "");/empty content
$ ("#txt"). attr ("value", ' 11 ');//fill content
Multi-Marquee checkbox: $ ("#chk1"). attr ("Checked", "");/no tick.
$ ("#chk2"). attr ("Checked", true);/tick
if ($ ("#chk1"). attr (' checked ') ==undefined)//judge whether it has been ticked
Radio Group radio:$ ("input[@type =radio]"). attr ("Checked", ' 2 ');//Set value=2 project is currently selected
Drop-down box select:$ ("#sel"). attr ("value", '-sel3 ');//Set VALUE=-SEL3 item as current selected
$ ("<optionvalue= ' 1 ' >1111</option><optionvalue= ' 2 ' >2222</option>"). Appendto ("#sel")// Option to add a drop-down box
$ ("#sel"). empty ();//Empty Drop-down box