jquery Text,radio,checkbox,select Operation Implementation code _jquery

Control form elements:

text box, text area:
$ ("#txt"). attr ("value") or $ ("#txt"). Val ()//Get value
$ ("#txt"). attr ("Value", "");/empty content
$ ("#txt"). attr ("value", ' 11 ');//fill content

Multi-selection box checkbox:
$ ("#checkbox_id"). attr ("value") or $ ("#checkbox_id"). Val ()//Get value
$ ("#chk1"). attr ("Checked", "");/no tick.
$ ("#chk2"). attr ("Checked", true);/tick
if ($ ("#chk1"). attr (' checked '))//Judge whether it has been ticked

Radio Group Radio:
$ ("input[type=radio][checked]"). Val ()//Get value
$ ("Input[name=tt]"). attr ("Checked", ' value2 ');//Set value= ' value2 ' item is currently selected
$ ("Input[name=items]"). Get (1). checked = true;//The second element is the current selected value

Dropdown box Select:
$ ("Select[name=topsearch] option[selected]"). Val ();//Get value
$ ("Select[name=topsearch] option[selected]"). Text ()//Get display
$ ("#sel"). attr ("value", ' sel3 ');//Set value= ' Sel3 ' item as the current selection
$ ("<option value= ' 1 ' >1111</option><option value= ' 2 ' >2222</option>"). Appendto ("#sel")// Option to add a drop-down box
$ ("#sel"). empty ();//Empty Drop-down box
$ (' #select_id ') [0].selectedindex = 1;//The second element of the Drop-down box is the currently selected value