An example of an option item in the sort select

Select| Sort | example

The select control in the form does not support sorting the selection (option), I will sort the value attribute values in option, and adjust the position of each option sort. The specific code is as follows (this assumes that the value in each option is the same as the text content in it):

The function uses the Sort method of array (array) objects to achieve a select sort.

function Sortme (osel) { var ln = oSel.options.length; var arr = new Array (); This is the key part. The value of all option in the Select is saved in the array for (var i = 0; i < ln; i++) { If you need to sort text in option, change to arr[i] = Osel.options[i].text; Arr[i] = Osel.options[i].value; } Arr.sort (); Start sorting Clear All option in select while (ln--) { OSEL.OPTIONS[LN] = null; } To add the sorted array back to the Select for (i = 0; i < arr.length; i++) { Osel.add (New Option (Arr[i], arr[i]); } } </script>