Detect if an element is selected in listbox or not through jquery

I have a multiselect listbox and before submit开发者_如何学运维ting the form i want to check whether user select any option or not through jquery

You could use the .val() function to get the selected values. For a multi select it returns an array of the selected values or null if no element has been selected:

if ($('#idofselect').val() != null) {
    // user has selected at least one value
}

Does this work for you:

$("#formID").submit(function()
{
  var selectValue = $('#selectList').val();
  if(selectValue != null)
  {
      // blah
  }
});

$('#list option:selected').length

Will get the amount of selected objects i think. (replace '#list' with your selector obviously).