JavaScript Tip of the Week for June 24, 1996: Too Many Browers? Wrong. | Source Code

JavaScript Tip of the Weekfor June 24, 1996: Source Code: Too Many Browers? Wrong.

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Detect which browser is being used, should be put in head area of page: 
/* This code is Copyright (c) 1996 Nick Heinle and Athenia Associates, 
 * all rights reserved. In order to receive the right to license this 
 * code for use on your site the original code must be copied from the
 * Web site webreference.com/javascript/. License is granted to user to 
 * reuse this code on their own Web site if and only if this entire copyright
 * notice is included. Code written by Nick Heinle of webreference.com.
 */
var version = 0;
        if (navigator.userAgent.indexOf("Mozilla/3.0") != -1) version = 3;
        else if (navigator.userAgent.indexOf("MSIE") != -1) version = 1;
        else if (navigator.userAgent.indexOf("Mozilla/2.0") != -1) version = 2;
        else version = 0;


Quick function to display which browser is being used: 

function which_one()
        {
        if (version == 3) return "Netscape Version 3.0";
        if (version == 2) return "Netscape Version 2.x.";
        if (version == 1) return "Microsoft Internet Explorer 3.0";
        if (version == 0) return "A browser I've never heard of"
        }


... which is activated by this image button: 

    <A HREF = "JavaScript:alert('You are using ' + which_one())">
    <IMG HEIGHT = 42 WIDTH = 105 BORDER = 0 SRC = "test_inactive.jpg"></A>



Detect which browser is being used and activate image commands if Netscape 3.0 is detected: 

var version = 0;
        if (navigator.userAgent.indexOf("Mozilla/3.0") != -1) 
        {
        version = 3;
        active = new Image(105, 42);
        active.src = "test_active.jpg";
        inactive = new Image(105, 42);
        inactive.src = "test_inactive.jpg";
        }
        else if (navigator.userAgent.indexOf("MSIE") != -1) version = 1;
        else if (navigator.userAgent.indexOf("Mozilla/2.0") != -1) version = 2;
        else version = 0;


If Netscape 3.0 detected, print out grey image button that changes, otherwise print out normal image button:
Note: each document.write should be in one continuous line. 
if (version == 3) 
{
document.write("<A HREF = \"JavaScript:alert(\'You are using \' + which_one\(\)\)\" 
onMouseOver = \"change_button\(\);return true\"><IMG HEIGHT = 42 
WIDTH = 105 BORDER = 0 SRC = \"test_inactive.jpg\"></A><BR>");
}
else
{  
document.write("<A HREF = \"JavaScript:alert(\'You are using \' + which_one\(\)\)\">
&ltIMG HEIGHT = 42 WIDTH = 105 BORDER = 0 SRC = \"test_active.jpg\"></A>");
}


Run this function to change the grey image button when mouse moves over it, put 0 in for x if image is first in document, 1 in for x if second image in document, etc.: 

function change_button() {
        document.images[x].src = active.src;
        setTimeout( "document.images[x].src = inactive.src", 2000);       
}