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JavaScript - Remove Duplicate Values from Arraylist String
By: Suresh Dasari Mar 12, 2013
Categories: General, Javascript
Introduction
Here I will explain how to use JavaScript to remove duplicate values from array or remove duplicate values/elements from string array using JavaScript.
Description:
In previous article I explained Show number of characters left in text using JavaScript, Set watermark text for textbox using JavaScript, JavaScript Automatically move cursor to next field when textbox full ,JavaScript add bookmark link to website and many articles relating to JavaScript, jQuery, SQL, asp.netetc. Now I will explain how to remove duplicate values/elements from string array using JavaScript.
To remove duplicate values/elements from string array using JavaScript we need to write the code like as shown below
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Remove duplicates from an array using JavaScript </title>
<script type="text/javascript">
function RemoveList() {
var sampleArr = new Array(1, 1, 1, 1, 1, 2, 2, 3, 3, 3, 4, 4, 4); //Sample array
uniqueArr(sampleArr);
}
//Adds new uniqueArr values to temp array
function uniqueArr(arr) {
arr1 = new Array();
for (i = 0; i < arr.length; i++) {
if (!checkstatus(arr1, arr[i])) {
arr1.length += 1;
arr1[arr1.length - 1] = arr[i];
}
}
alert(arr1);
}
// Check if it contains unique or duplicate record
function checkstatus(arr, e) {
for (j = 0; j < arr.length; j++) if (arr[j] == e) return true;
return false;
}
</script>
</head>
<body>
<div>
<input type="button" value="Remove Duplicates" onclick="RemoveList()" />
</div>
</body>
</html>
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Live Demo
For live demo click on below button it will return only unique values from this string (1, 1, 1, 1, 1, 2, 2, 3, 3, 3, 4, 4, 4) values
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