Checkbox,select,radio Select value, set value, echo value

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 Box Echo

Radio Group Radio: $ ("input[type=radio][name= ' ifupdatematprice '][value= '" +ifupdatematprice+ "]"). attr ("Checked", ' Checked ');//Set value=2 item is currently selected
Dropdown box Select: $ ("#sel"). attr ("value", '-sel3′);//Set VALUE=-SEL3 item is currently selected
$ ("1111 2222"). Appendto ("#sel")//option to add a drop-down box
$ ("#sel"). empty ();//Empty Drop-down box

//Radio Box Echo

JS Code:

var ifupdatematprice=$ ("#echo_ifUpdateMatPrice"). Val (); //ifupdatematprice The value obtained from the JSP page tag
$ ("Input[type=radio][name= ' ifupdatematprice '][value= '" +ifupdatematprice+ "]"). attr ("Checked", ' checked ');

JSP Tag code:
<input type= "hidden" id= echo_ifupdatematprice "value=" ${ Suppliers.ifupdatematprice} ">  // Suppliers Background Model.addattribute (" Suppliers ", suppliers); Upload to page