Calling external function via button's onclick event...

Debbie

I have always used VBScript but now need to convert my syntax to JavaScript.
In an external file, I have a function that is called when a user clicks a
button on a login page. The function checks the format of data that has
been entered by the user and makes sure that all required fields have been
filled out. On the login page, between the <head></headtags I have the
following syntax:

<script language="javascript" src="scripts/login.js"></script>

The syntax on the button is as follows:

<input type="button" name="cbSubmit" value="Login"
onClick="javascript:validateentry" tabindex="4" style="cursor:hand;">

When I load the page and click the button, I get the following error
message:

Error: 'validateentry' is undefined

I am a JavaScript newbie and already am at a loss to see what the problem
is! I have checked the obvious and can confirm that the function name and
case is correct and matches in both the JS file and the web page. I'm sure
it's something really simple, but I just can't see it!!

Can anyone help me?!

Debbie :(

Aug 15 '07 #1

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Thomas 'PointedEars' Lahn

Debbie wrote:

I have always used VBScript but now need to convert my syntax to JavaScript.

Probably Microsoft JScript.

In an external file, I have a function that is called when a user clicks a
button on a login page. The function checks the format of data that has
been entered by the user and makes sure that all required fields have been
filled out. On the login page, between the <head></headtags

= within the `head' element.

I have the following syntax:

<script language="javascript" src="scripts/login.js"></script>

Remove the deprecated `language' attribute, add the required `type'
attribute with value "text/javascript".

The syntax on the button is as follows:

<input type="button" name="cbSubmit" value="Login"
onClick="javascript:validateentry" tabindex="4" style="cursor:hand;">

`cb' is a prefix I reserve for CheckBoxes, `bt' for BuTtons; however, I
don't think this `input' element needs a name.

Remove `javascript:'. Replace the proprietary `hand' with the standards
compliant `pointer' value.

When I load the page and click the button, I get the following error
message:

Error: 'validateentry' is undefined

Maybe that is because of the missing `type' attribute. Another, more likely
possibility is that you have not used the same character case as in the
method declaration. J(ava)Script/ECMAScript identifiers are case-sensitive,
VBScript probably is not (as VBA is not).

Furthermore, as functions/methods are first-class objects (Function objects)
in ECMAScript implementations, and the identifier is a reference to that
object, using the identifier alone is not enough to call a function/method
as it probably is in VBScript. You have to append a (here empty) parameter
list, sometimes called "the call operator":

validateEntry()
HTH

PointedEars
--
realism: HTML 4.01 Strict
evangelism: XHTML 1.0 Strict
madness: XHTML 1.1 as application/xhtml+xml
-- Bjoern Hoehrmann

Aug 15 '07 #2

Randy Webb

Thomas 'PointedEars' Lahn said the following on 8/15/2007 2:13 PM:

Debbie wrote:
>I have always used VBScript but now need to convert my syntax to JavaScript.

Probably Microsoft JScript.

You have a vivid imagination sometimes.

>In an external file, I have a function that is called when a user clicks a
button on a login page. The function checks the format of data that has
been entered by the user and makes sure that all required fields have been
filled out. On the login page, between the <head></headtags

= within the `head' element.

Irrelevant.

>I have the following syntax:

<script language="javascript" src="scripts/login.js"></script>

Remove the deprecated `language' attribute, add the required `type'
attribute with value "text/javascript".

And use an attribute whose only value is obsolete.

>The syntax on the button is as follows:

<input type="button" name="cbSubmit" value="Login"
onClick="javascript:validateentry" tabindex="4" style="cursor:hand;">

`cb' is a prefix I reserve for CheckBoxes, `bt' for BuTtons; however, I
don't think this `input' element needs a name.

What you reserve prefixes for is irrelevant.

Remove `javascript:'. Replace the proprietary `hand' with the standards
compliant `pointer' value.

Totally irrelevant to anything about JS.

>When I load the page and click the button, I get the following error
message:

Error: 'validateentry' is undefined

Maybe that is because of the missing `type' attribute.

Monkeys ass and you know it.

Another, more likely possibility is that you have not used the same character
case as in the method declaration.

More monkeys ass and you know it.

Furthermore, as functions/methods are first-class objects (Function objects)
in ECMAScript implementations, and the identifier is a reference to that
object, using the identifier alone is not enough to call a function/method
as it probably is in VBScript. You have to append a (here empty) parameter
list, sometimes called "the call operator":

validateEntry()

And you only had to babble about irrelevant things for a few minutes
until you pointed out the problem.

--
Randy
Chance Favors The Prepared Mind
comp.lang.javascript FAQ - http://jibbering.com/faq/index.html
Javascript Best Practices - http://www.JavascriptToolbox.com/bestpractices/

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