Avoid duplicate record from dropdown Javascript PHP -


i have code this

        <!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd">         <html xmlns="http://www.w3.org/1999/xhtml">         <head>         <meta http-equiv="content-type" content="text/html; charset=utf-8" />         <title>eg - textbox dropdown</title>         </head>         <body>         <input name="textboxexample" type="text" maxlength="50" id="textboxexample" tabindex="2"         onchange="dropdownindexclear('dropdownextextboxexample');" style="width: 242px;         position: absolute; top: 0px; left: 0px; z-index: 2;" />         <select name="dropdownextextboxexample" id="dropdownextextboxexample" tabindex="1000"         onchange="dropdowntexttobox(this,'textboxexample');" style="position: absolute;         top: 0px; left: 0px; z-index: 1; width: 265px;">         <option value="value item 1" title="title item 1">item 1</option>         <option value="value item 2" title="title item 2">item 2</option>         <option value="value item 3" title="title item 3">item 3</option>         </select>         <script language="javascript" type="text/javascript">         //since first <option> preselected indexclear function must fire once clear out.         dropdownindexclear("dropdownextextboxexample");         </script>         </div>         </body>         </html>         <script type="text/javascript">         function dropdowntexttobox(objdropdown, strtextboxid) {         document.getelementbyid(strtextboxid).value += objdropdown.options[objdropdown.selectedindex].value.concat(',');         dropdownindexclear(objdropdown.id);         document.getelementbyid(strtextboxid).focus();         }         function dropdownindexclear(strdropdownid) {         if (document.getelementbyid(strdropdownid) != null) {         //document.getelementbyid(strdropdownid).selectedindex = -1;         var x=document.getelementbyid("dropdownextextboxexample");         x.remove(x.selectedindex);         }         }         </script>

the code works fine, need avoid same record selected again , again.

for ex: if select item 1 dropdown should not selected again. in case, can select item 1 'n' number of times.

i need here.

thanks haan

<select name="dropdownextextboxexample" id="dropdownextextboxexample" tabindex="1000"         onchange="dropdowntexttobox(this,'textboxexample');" style="position: absolute;         top: 0px; left: 0px; z-index: 1; width: 265px;">          <option value="">select item</option>         <option value="value item 1" title="title item 1">item 1</option>         <option value="value item 2" title="title item 2">item 2</option>         <option value="value item 3" title="title item 3">item 3</option>         </select>

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