[SOLVED] Homebrew library problems

KevinM1 · May 12, 2008

I'm trying to create 'my own' (read: bits copied from a variety of sources) JavaScript library. I've decided to use a namespace methodology similar to that of the YUI library. Unfortunately, it looks like I have something weird going on with my naming. Everything will make more sense after I show the relevant pieces of code.

My HTML is a simple form with one input used to test if the validation function I've incorporated is working. So, its code is:

<html>
<head>
  <title>JavaScript Library Test</title>
  <script type="text/javascript" src="js/MPlib.js"></script>
  <script type="text/javascript">
     window.onload = function()
     {
        var inputForm = document.getElementById("inputForm");

        inputForm.onsubmit = validate;

        function validate()
        {
           if(!MP.Form.Validate.validateEmail(this.elements["email"])) // <-- line giving me the error
           {
               alert("E-mail entry not valid!");
           }
        }
     }
  </script>
</head>

<body>

<form id="inputForm" name="form" action="#" method="POST">
  E-mail: <input name="email" type="text" />
  <input name="submit" type="submit" value="submit" />
</form>

</body>
</html>

I get an error on the line I commented above. Specifically, the error occurs after I click submit. It is:

Error: MP is not defined
Source File: http://www.nightslyr.com/jstest.html

Line: 14

This is odd, as MP is defined (although it, itself, is empty). Here's the relevant library code (apologies for the spacing...it looks like Notepad++'s tabs don't copy over):

/**
*This is my first attempt at building a JavaScript library.
*While most of my code will use a pre-existing library (YUI, Scriptaculous, JQuery, Prototype, or Moo.fx), 
*I still have other helper functions I'd like to use.
*
*Date: May 12, 2008
*/

/**
*Global namespace
*/

var MP = {};

//-----------------------------------------------------------------------------------------------

/**
*Form namespace
*/

MP.Form = {};

//-----------------------------------------------------------------------------------------------

/**
*Form handling/validation namespace.
*/

MP.Form.Validate =
{
/**
 *Function to see if a required input has had information entered into it.
 *
 *@elem - element we're checking.
 *@getInputsByName - helper function.
 *@original - from John Resig's book Pro JavaScript Techniques
 */

 checkRequired = function(elem)
 {
	if(elem.type == "checkbox" || elem.type == "radio")
	{
		return getInputsByName(elem.name).numChecked;
	}
	else
	{
		return elem.value.length > 0 && elem.value != defaultValue;
	}
}

//-----------------------------------------------------------------------------------------------

/**
 *Helper function to find all input elements that have a specific name (good for those pesky checkboxes and radio buttons).
 *
 *@name - name of the elements we're looking for.
 *@original - from John Resig's book Pro JavaScript Techniques.
 */

 getInputsByName = function(name)
 {
	//The array of input elements that will be matched.
	var results = [];

	//Counter to keep track of how many have been checked.
	results.numChecked = 0;

	//Find all input elements in the document.
	var inputs = document.getElementsByTagName("input");

	for(var i = 0; i < inputs.length; i++)
	{
		//Find all inputs that have the name we're looking for.
		if(inputs[i].name == name)
		{
			//Add it to the array
			results.push(input[i]);

			//Remember how many of the fields have been checked, if any
			if(input[i].checked)
			{
				results.numChecked++;
			}
		}
	}

	return results;
}

//-----------------------------------------------------------------------------------------------

/**
 *Function that validates an e-mail address.
 *
 *@elem - the element whose value we're checking.
 */

validateEmail = function(elem)
{
	return elem.value == '' || /^[a-z0-9_+.-]+\@([a-z0-9-]+\.)+[a-z0-9]{2,4}$/i.test(elem.value);
}

//-----------------------------------------------------------------------------------------------

/**
 *Function that validates an inputed URL.
 *
 *@elem - the element whose value we're checking.
 */

validateURL = function(elem)
{
	return elem.value == '' || !elem.value = 'http://' || /^https?:\/\/([a-z0-9-]+\.)+[a-z0-9]{2,4}.*$/i.test(elem.value);
}

//-----------------------------------------------------------------------------------------------

/**
 *Other validation functions to be added later.
 */
};

I fail to see how MP is not defined. Unfortunately the alert isn't firing at all, so I'm at a bit of a loss. Please help.

EDIT: While I'm here, I have another issue. I have the following error in my library code:

missing : after property id
http://www.nightslyr.com/js/MPlib.js

Line 34

The code is:

MP.DOM =
{
/**
 *Function to get/set element attributes.
 *It normalizes those tricky cases of 'for' = 'htmlFor' and 'class' = 'className'.
 *
 *@elem - element we're accessing
 *@name - name of the style
 *@value - value of what we're setting (if any)
 *
 *@original - From John Resig's book Pro JavaScript Techniques
 */

handleAttr = function(elem, name, value) // <-- error here
{
	//Make sure a valid name was provided
	if(!name || name.constructor != String)
	{
		return '';
	}

	//Figure out if the name was one of the weird naming cases
	name = {'for' : 'htmlFor', 'class' : 'className'}[name] || name;

	//If the user is setting a value, also
	if(typeof value != 'undefined')
	{
		elem[name] = value

		//If we can use setAttribute

		if(elem.setAttribute)
		{
			elem.setAttribute(name, value);
		}
	}

	//Return the value of the attribute
	return elem[name] || elem.getAttribute(name) || '';
}

//-----------------------------------------------------------------------------------------------

/**
 *Function to create a new DOM element.
 *It normalizes XHTML and HTML element creation.
 *
 *@elem - type of element we're creating
 *@original - from John Resig's book Pro JavaScript Techniques
 */

createElem = function(elem)
{
	return document.createElementNS ? document.createElementNS('http://www.w3.org/1999/xhtml', elem) : document.createElement(elem);
}
};

Firefox's console tells me it's between the '=' and function(...). I can't figure out why it's choking on it, though.

KevinM1 · May 12, 2008

Like always, it was a couple of syntax errors that screwed me up.

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[SOLVED] Homebrew library problems

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