Example code for jQuery operation select_jquery

select:

Copy code The code is as follows:

The country that won the 2008 European Cup is ：

Please select

France
Italy
< option value="England">UK
Spain
Greece

1. Determine whether the country is selected.

Copy code The code is as follows:

if($("#nation").val( )=="") {
alert("Please select a country");
}

　2. Get the number of option items in the select.

Copy code The code is as follows:

$("#nation").find("option"). length;

　3. Get the value of the selected option and the displayed text.

Copy code The code is as follows:

//Get the value of the selected item
$("#nation ").val();
//Get the text displayed by the selected item
$("#nation").find("option:selected").text();

4. Set Spain as the selected item.

Copy code The code is as follows:

$("#nation").find("option[value= 'Spain']").attr("selected",true);

5. Get the index of the selected country. The index starts from 0.

Copy code The code is as follows:

$("#nation").find("option:selected" ).index()

　 6. Add a country option.
?

Copy code The code is as follows:

$("#nation").append(" Ukraine");

　7. Delete a country option.

Copy code The code is as follows:

//Delete the option of value="Italy"
$( "#nation").find("option[value='Italy']").remove();
//Remove the option with index 2
$("#nation").find("option [index=2]").remove();