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Using JQuery, how can I check if the dropdown menu contains a value?

Using JQuery, how can I check if the dropdown menu contains a value? By meaning, I don't mean the text displayed as a menu item. I mean the id (val) of the element. I have a list of items already in the dropdown and I want to add more. Before I do that, I want to make sure I don't duplicate key pairs.

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3 answers


Something like this will do what you want. ( JSFiddle )

Html

<select id="sel">
    <option value="foo">foo</option>
</select>
<button data-add="foo">add foo</button>
<button data-add="bar">add bar</button>


Js

$('button').on('click', function() {
    var new_val = $(this).data('add');

    if ($('option[value='+new_val+']', '#sel').length) {
        alert('nope, exists!')
    } else {
        $('<option value="'+ new_val +'">'+new_val+'</option>').appendTo( $('#sel') );
    }
});

If you are using an older version of jQuery than 1.7, use .bind

instead .on

.

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you can try this

  $(document).ready(function () {

  if ($("#drpentry").find("option[value='Dog']:contains('Ds')").length > 0) {

             alert('exist entry');
       }
       else {

           alert('not exist');
       }

   });


here: http://jsfiddle.net/Eemqh/1/

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Here is a shortened version of Marc Diethelms solution without data attributes: jsfiddle

$('button').bind('click', function() {
    var new_val = $(this).html().split(' ').splice(1).join(' '),
        $sel = '#sel';
    $('option[value='+new_val+']', $sel).length > 0 ?
        alert('nope, exists!') :
        $('<option value="'+ new_val +'">'+new_val+'</option>').appendTo($sel);
});
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