Searching Array

**owerio** · Sep 21, 2007, 16:06

Hello. I have a number array with fifty elements. I wish to search the array for the elements whose value is ,say, 5 . Then I will use the element's value and index number in a conditional. In short , how can I search the array for values and retrieve the index number ?

Thanks in advance.

**twodogs** · Sep 21, 2007, 20:01

Do you mean something like

Code:

<script>
 arr = new Array(); 
 arr[0]="1";
 arr[1]="2";
 arr[2]="3";
arr[3]="4";
arr[4]="5";

var num=5;
function get_index(){
for(var i=0; i<arr.length; i++){
if(arr[i]==num){
var index=i;
var index_value=arr[i];
}
}
}
</script>

**owerio** · Sep 22, 2007, 00:04

Thanks for the code @twodogs. Exactly this is the code I seek. But I have to retrieve every index that resides the element whose value is 5. In above code lets assume array[3] and array[4] values are 5. How can I retrieve both index from the loop?

**twodogs** · Sep 22, 2007, 01:47

There is probably a better way but this works. Instead of putting the values into a variable put them each into an array.

Code:

<!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=iso-8859-1" />
<title>Untitled Document</title>
<script>
 arr = new Array() 
 arr[0]="5"
 arr[1]="2"
 arr[2]="5"
arr[3]="4"
arr[4]="5"

index=new Array();
index_value=new Array();

var num=5;
function get_index(){
for(var i=0; i<arr.length; i++){
if(arr[i]==num){
index.push(i);
index_value.push(arr[i]);
}
}
document.write(index);
document.write(index_value);
}
</script>
</head>

<body onload="get_index()">
</body>
</html>

**owerio** · Sep 22, 2007, 13:58

That is OK now @twodogs. Thanks.

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