Javascripts > Javascript Forms > Remove Duplicates From List
Script Title: Remove Duplicates From List
Description: Remove duplicates from any list.
Example: Available
Credit: Script created by Paul Galloway
Copy the following code into your <HEAD></HEAD> tags.<SCRIPT LANGUAGE="Javascript"> <!-- function dedupe_list() { var count = 0; var mainlist = document.form1.mainlist.value; mainlist = mainlist.replace(/\r/gi, "\n"); mainlist = mainlist.replace(/\n+/gi, "\n"); var listvalues = new Array(); var newlist = new Array(); listvalues = mainlist.split("\n"); var hash = new Object(); for (var i=0; i<listvalues.length; i++) { if (hash[listvalues[i].toLowerCase()] != 1) { newlist = newlist.concat(listvalues[i]); hash[listvalues[i].toLowerCase()] = 1 } else { count++; } } document.form1.mainlist.value = newlist.join("\r\n"); alert('Removed ' + count + ' duplicate values from list. . .'); } //--> </SCRIPT>
Copy the following code between the <BODY></BODY> tags of your html page.<form action="" name="form1" id="form1"> <table border=1 cellpadding=5> <tr> <td>Paste list to be de-duped here<br>(one value per line)<p><textarea name="mainlist" COLS=30 ROWS=20></textarea></td> </tr> <tr><td align="center"><input type="button" onClick="dedupe_list();" value="Remove Duplicates"></td></tr> </table> </center> </form>
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