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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
Rating: 4 stars4 stars4 stars4 stars4 stars / 34
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
(Page 1 of 5 )

I already covered single dimensional and two dimensional arrays in my first article.  If you are new to JavaScript arrays, I strongly suggest you to go through that article.  All of the examples in this series can be directly tested, by simply copying and pasting the entire code (of each section) in any text file with the extension .HTM and open it using a browser.

How to copy the elements of an array into another using JavaScript

I already covered different kinds of arrays in my first article.  I explained combining (joining) and splitting arrays in my second article.  In this section, I focus on copying arrays.

Now, let us try to develop a simple script (JavaScript) which copies some of the elements present in the first array into the second.  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 SimpleString = "abc;def;ghi;jkl;mno;qrs";

      var myArray = SimpleString.split(";");

      var subArray = myArray.slice(0,3);

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

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

      {

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

      }

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

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

      {

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

      }

}

 

functionButton1_onclick() {

      Show();

}

//-->

            </script>

      </head>

      <body>

      <form id="form1">

                  <input type="button" value="Copy and Show" id="Button1" name="Button1" onclick="return Button1_onclick()">

            </form>

      </body>

</html>

Actually, within the above code, the “meta” tag is not necessary.  Since I developed the above code using Visual Studio.NET 2003 Enterprise Architect, it was automatically added to provide its full-featured mechanisms. 

When the above code is executed, the following output is generated.

first array
---------
abc
def
ghi
jkl
mno
qrs

second array
---------
abc
def
ghi

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


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