CodeLifter.com - JavaScript Using Images for Submit and Reset Buttons in Forms Script

<!--
====================================================================
Script:  Active Tri-State Roll-Over Images on Form Submit and Reset
         Script Boilerplate and Quick-Take Tutorial
         
Source:  (C) 2001 by CodeLifter.com at http://www.codelifter.com

Author:  etLux

Desc.:   This script shows how to use tri-state rollover images with
         forms, instead of the usual rather unattractive 'gray
         buttons' for Submit and Reset.
         
Use:     All version 4.x and later browsers

====================================================================

INSTRUCTIONS:

Copy and paste this entire presentation into a blank page.  Detailed
instructions and tutorial comments are included within the script.

There is no extraneous code in the presentation, other than the
comments.

Don't let the length of this example throw you.  The real code is
very short -- the comments and explanations make up the bulk of this
presentation.

//-->

<html>

<head>

<!-- Notes on STYLE

The <style> ... </style> below is optional.  However, you can
use this effectively to produce a more attractive appearnce in IE 4
and later and in NS6.  Modify the style to suit your layout.

For more on style attributes, see:
http://msdn.microsoft.com/workshop/author/css/reference/attributes.asp

//-->

// ===== Set Up =========================================================
// Preload the images to be used with the form
// ======================================================================

// (Don't touch the next line; it declares the image array.)
var Pic = new Array

// Place the names of the images into the array below. Watch how the
// image 'buttons' perform to see which image is which.

// The numbers in the array below will equate to the images  to be called
// by the switchImage() function, further below.

Pic[0] = 'reset_green.gif'
Pic[1] = 'reset_orange.gif'
Pic[2] = 'reset_red.gif'
Pic[3] = 'submit_green.gif'
Pic[4] = 'submit_orange.gif'
Pic[5] = 'submit_red.gif'

// ===== Main Program ===================================================
// Read the comments within before editing anything below this line.
// ======================================================================

// ----------------------------------------------------------------------
// This section of code preloads the images you named in the Pic[] array
// above, so images will be ready as soon as the page opens.

var p = Pic.length
var preLoad = new Array()
var i = 0;
for (i = 0; i < p; i++){
     preLoad[i] = new Image()
     preLoad[i].src = Pic[i]
}

// ----------------------------------------------------------------------
// The next very short function, switchImage(whichImage,imageNumber),
// handles all image switching in response to mouseOver, mouseOut, and
// mouseDown events.
//
// The variable whichImage carries the *name* of the image to be
// switched (see the comments in the HTML below) -- in this case, either
// 'resetImage' or 'submitImage'.
//
// The variable imageNumber carries the number of the image to be called,
// as per the numbers in the Pic[] array up above.
//
// Read the HTML code comments below to see how to attach this function
// to the images. Note that it's actually hooked to <a href> tags around
// the images, rather than to the images themselves, since NS4 does not
// allow attaching events to images.

function switchImage(whichImage,imageNumber){
   document.images[whichImage].src = preLoad[imageNumber].src
}

// ----------------------------------------------------------------------
// The doSubmit() function fires whenever the submitImage is clicked.
// You will wish to modify this function to perform the action you wish
// to take place when the submitImage is clicked.  See the comments
// within the function.

function doSubmit(){

// message for the Submit alert box
   // note how \n is used for line formatting
   var S = "SUBMIT - look in the code, and replace this alert box \n"+
           "with whatever action you wish to perform when the submit \n"+
           "image 'button' is clicked.\n\n"+
           "If you wish to call an html page, then you would use...\n\n"+
           "window.location='http://www.address.com/page.html' \n\n"+
           "If you wish to call a script, then use the address of the\n"+
           "the script. Additional code would be required if you need\n"+
           "to pass values from the form fields to the cgi script. \n"
   
   // call the alert box        
   alert(S)
   
   // optional -- but it gets the lines off the image in IE
   self.focus()
   
   // if you wanted to call an html page, this is where you would
   // do it, in the format of the following example line...
   // window.location='http://www.codebrain.com/java/index.html'
}

// ----------------------------------------------------------------------
// The doReset() function fires whenever the resetImage is clicked.  You
// will normally use this just to clear fields; but see the comments
// below.

function doReset(){

// message for the Reset alert box
   // note how \n is used for line formatting
   var R = "RESET - This is usually used to reset a form to a state \n"+
           "where all the fields in the form are empty -- though in\n"+
           "some cases, it can also be used to reset the form fields \n"+
           "to certain preset values. \n\n"+
           "In either case, you must *name* both the form itself and \n"+
           "each of the fields in the form, so that the script can \n"+
           "find them. \n\n"+
           "In this case we'll just clear the fields. See the code for\n"+
           "more on this."

// call the alert box           
   alert(R)

// optional -- but it gets the lines off the image in IE
   self.focus()

// clear the fields in the form...
   // note the naming convention in the format of
   // document.FORMNAME.FIELDNAME.value
   // to add more fields, just follow the same format
   
   document.TheForm.FieldOne.value = ""
   document.TheForm.FieldTwo.value = ""
   
   // if you want to have new values inserted in the field, then
   // simply put the material between the "" in the lines
   // immediately above.   
}

</script>

</head>

<!-- Setting Up The Form

Be sure to *name* both the <form> and the fields in it,
as shown below.  Note how these names are used in the
doReset() function in the script above.

The class="TAS" is used to attach the style (see above)
to the textarea fields.  This is optional.

//-->

<form name="TheForm">
<textarea name="FieldOne" class="TAS" rows="4"  cols="42" wrap="virtual">
The form itself must be named; so must
the fields in the form.
The name of this form is "TheForm".
The name of this field is "FieldOne".
Yadda Yadda.
Yadda Yadda.
</textarea>
<br>
<textarea  name="FieldTwo" class="TAS" rows="4" cols="42" wrap="virtual">
A seconde sample textarea field with, of
course, still more sample stuff in it.
The Name of this field is "FieldTwo".
Yadda Yadda.
Yadda Yadda.
</textarea>
</form>
<br>

<!-- Setting Up The Images

The individual functions are attached by means of the  <a href> ... </a>
tags surrounding the images.  See the explanations of the switchImage(),
doReset(), and doSubmit() functions above.

(Note that the html shown below is in open format for sake of clarity
in this demo.  You may tighten up the code in your page per usual.  This
will remove any leading / trailing spaces around the images.)

In order for this to work correctly, you *must* properly *name* the
images, as shown in the code below.

//-->

</body>

</html>

Right-click to save the images if you'd like to use them.

If making your own images, note how the three variations are
slightly offset from each other, in order to give a motion effect
in response to the mouse events.

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