Javascript and JQuery, how to verify if option element exists in select?

Question

Using JQuery, I\'m trying to set an option as selected in a \'select\' element based on the query string.

This question is similar to this, however I still need to k

Answer 1

You could use .length>0 to check if the element does exist. But if you are running this code over and over again it get's kind of annoying so I have written a little plugin which ensures that kind of functionality:

/* doesExist PLUGIN (c) MS */
/* (c) Michael Stadler(MS), */
(function($){
$.fn.doesExist = function()
{
return jQuery(this).length > 0;
};
})(jQuery);

Usage:

$('#myDiv').doesExist() // returns a boolean

Answer 2

Check the length of the selector:

var selectObject = $('select[name*=' + selectName + ']');
if (selectObject.length == 0)
    return;
selectObject.val(valueToSelect).attr('selected', 'selected').change();

Or use the implicit boolean conversion in javascript:

var selectObject = $('select[name*=' + selectName + ']');
if (!selectObject.length)
    return;

selectObject.val(valueToSelect).attr('selected', 'selected').change();

Answer 3

try to check selectObject.find('option[value="'+valueToSelect +'"]').length > 0