javascript - Check for duplicated names in a list element -


question:

how check duplicated names/items in list element?

my situation:

i've got list within list, here example:

<ol class="sortable ui-sortable"> <li id="category_1"><div>car</div>    <ol>        <li id="category_2"><div>color</div>             <ol>                 <li id="category_3"><div>red</div></li>                 <li id="category_4"><div>black</div></li>             </ol>        </li>    </ol> </li> <li id="category_5"><div>motor</div>    <ol>        <li id="category_6"><div>red</div></li>        <li id="category_7"><div>black</div></li>    </ol> </li> <li id="category_9"><div>truck</div></li> </ol>

the class="sortable ui-sortable" being used nestedsortable jquery plugin. list items dragable.

i want check names within divs, when div dragged list <ol>. if list contains duplicate, highlight in red.

for exampe if drag red - category_6 ol within color - category_2, allready contains red, place (dropspot) turns red. if user decides still drop on place, list returns original position. category_6 moved ol beneath category_5.

so list end this, or else if have better way:

<ol class="sortable ui-sortable"> <li id="category_1"><div>car</div>    <ol>        <li id="category_2"><div>color</div>             <ol>                 <li id="category_3"><div>red</div></li>                 <li id="category_4"><div>black</div></li>                 <li id="category_6" class="highlighted"><div>red</div></li>             </ol>        </li>    </ol> </li> <li id="category_5"><div>motor</div>    <ol>        <li id="category_7"><div>black</div></li>    </ol> </li> <li id="category_9"><div>truck</div></li> </ol>

considering list 

<ul id="myid">     <li>apple</li>     <li>ibm</li>     <li>apple</li>     <li>microsoft</li>     <li>ibm</li> </ul>

the script finding duplicates suggest 

var litext = '', lilist = $('#myid li'), listofduplicate = []; $(lilist).each(function () { var text = $(this).text(); if (litext.indexof('|' + text + '|') == -1) litext += '|' + text + '|'; else listofduplicate.push($(this)); });  $(listofduplicate).each(function () {      alert("duplicates :  " + $(this).text()); });

example using fiddle


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