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JavaScript arrays: copying, transferring and merging


This series of articles mainly concentrates on working with JavaScript arrays. This is the third article in the series. It mainly concentrates on working with multiple arrays effectively. You can reuse these scripts to inject into server side controls easily (especially in .NET and Java).

Author Info:
By: Jagadish Chaterjee
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March 14, 2006
TABLE OF CONTENTS:
  1. · JavaScript arrays: copying, transferring and merging
  2. · How to copy the elements of one array into another using JavaScript: discussion
  3. · How to transfer the elements of one array into another using JavaScript
  4. · How to merge two arrays into a single array using JavaScript
  5. · How to merge two arrays into a single array using JavaScript: discussion

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JavaScript arrays: copying, transferring and merging - How to merge two arrays into a single array using JavaScript
(Page 4 of 5 )

In our previous sections, we managed to copy or transfer the information available in one array to another.  In this section, we shall deal with merging two arrays into a new array.

Now, let us try to develop a simple script (JavaScript) which merges two arrays into the third array. Have a look at the following code:

<html>

      <head>

            <meta name=vs_targetSchema content="http://schemas.microsoft.com/
intellisense/ie5">

<script id="clientEventHandlersJS" language="javascript">

<!--

functionShow()

{

      var myArray1 = new Array();

      myArray1[0] = "Jag";

      myArray1[1] = "Chat";

      myArray1[2] = "Win";

      myArray1[3] = "Dhan";

     

      var myArray2 = new Array();

      myArray2[0] = "aaa";

      myArray2[1] = "bbb";

      myArray2[2] = "ccc";

      myArray2[3] = "ddd";

     

      var myArray3 = myArray1.concat(myArray2);

      document.write("Merged array<br>----------------<br>");

      for (var i = 0; i < myArray3.length; i++)

      {

            document.write(myArray3[i] + "<BR>");

      }

}

 

functionButtonMerge_onclick() {

      Show();

}

//-->

            </script>

      </head>

      <body>

      <form id="form1">

                  <input type="button" value="Merge and Show" id="ButtonMerge" name="ButtonMerge" onclick="return ButtonMerge_onclick()">

            </form>

      </body>

</html>

When the above code is executed we get the following output:

Merged array
----------------
Jag
Chat
Win
Dhan
aaa
bbb
ccc
ddd

The explanation for the above code is given in the next section.


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