/*********************************************
 * form_validation.js                        *
 * 1.0 - 11/21/2002 mmcclain@gsd.harvard.edu *
 *********************************************/

/* Here is an example to test the functions
<form method="POST" action="test.cgi">
  <p>
  	Full Name: <input name="Full Name_require" size="32" ><br>
  	Email: <input name="valid_email" size="32" ><br>
  	Phone: <input name="user_phone" size="16" ><br>
  	Month: <input name="test_month" size="16" >
  	Day: <input name="test_day" size="16" >
  	Year: <input name="test_year" size="16" ><br>
  	Todays Date: <input name="today_date" size="16" ><i>(mm/dd/yyyy)</i><br>
  	Zipcode: <input name="zipcode_zip" size="16" ><br>
  </p><p>
  	<input type="submit"
  	value="Submit" name="submit" onclick="return check(form,form.elements.length)">
  </p>
</form>  
*/

function check(form, length) {
	length--; // adjust the length so we only loop through the elements
	var errors = "";
	for (var i = 0; i <= length; i++) {
		var fieldname = form.elements[i].name;
		var flag = fieldname.indexOf("_");
		var tag = fieldname.substring(flag, fieldname.length);
		if (flag != -1) { // its something to validate.
			if (tag == "_email") {
				var result = check_email(form, i);
				if (!result) {
					errors += "Invalid email address.\n";
				}
			} else if (tag == "_phone") {
				var result = check_phone(form, i);
				if (!result) {
					errors += "Invalid phone number.\n";
				}
			} else if (tag == "_zip") {
				var result = check_zip(form, i);
				if (!result) {
					errors += "Invalid zipcode.\n";
				}
			} else if (tag == "_month") {
				var result = check_month(form, i);
				if (!result) {
					errors += "Invalid month.\n";
				}
			} else if (tag == "_day") {
				var result = check_day(form, i);
				if (!result) {
					errors += "Invalid day.\n";
				}
			} else if (tag == "_year") {
				var result = check_year(form, i);
				if (!result) {
					errors += "Invalid year.\n";
				}
			} else if (tag == "_date") {
				var result = check_date(form, i);
				if (!result) {
					errors += "Invalid date.\n";
				}
			} else if (tag == "_require") {
				var result = check_req(form, i);
				if (!result) {
					var fakenamelen = fieldname.length - tag.length;
					var fakename = fieldname.substring(0, fakenamelen);
					errors += fakename + " is required.\n";
				}
			}
		}
	}
	if (errors.length == 0) {
		form.submit();
	} else {
		alert("Please fix the following errors:\n" + errors);
		return false;
	}
	return true;
}

function check_email(form, element) {
	var field = form.elements[element].value;
	var at = field.indexOf("@");
	var user = field.substring(at,-1);
	var host = field.substring(at,field.length);
	var dot = host.indexOf(".");
	var domain = host.substring(dot,-1);
	var tld = host.substring(dot,host.length);
	// Now we need to check that the user is at least 1 the domain is at least 2 and the top level domain is at least 2.
	// host will be @host.tld so domain will be @domain and tld will be .tld so we need to add one to each length check. hence 2 not 1
	// mmcclain@gsd.harvard.edu will have user=mmcclain host = @gsd tld = .harvard.edu which passes the test
	// so the check is fine even if its not the best code
	if ((user.length > 0) && (domain.length > 2) && (tld.length > 2)) {
		return true;
	} else {
		return false;
	}
}

function check_phone(form, element) {
	var field = form.elements[element].value;
	if (field.length == 10) {
		return isNumber(field);
	} else if (field.length == 12) {
		var areacode = field.substr(0,3);
		var prefix = field.substr(4,3);
		var number = field.substr(8,4);
		if (isNumber(areacode) && isNumber(prefix) && isNumber(number)) {
		// this allows for 111-222-3333 and 111122223333
		//but we'll asume this is just to catch mistakes and not be the html form police
			return true;
		} else {
			return false;
		}		
	} else {
		return false;
	}
}

function check_zip(form, element) {
	var field = form.elements[element].value;
	if (isNumber(field)) {
		if (field.length == 5) {
			return true;
		} else {
			return false;
		}
	} else {
		return false;
	}
}

function check_month(form, element) {
	var field = form.elements[element].value;
	return valid_month(field);
}

function valid_month (field) {
	if (isNumber(field)) {
		if (field < 1 || field > 12) {
			return false;
		} else {
			return true;
		}
	} else {
		return false;
	}
}

function check_day(form, element) {
	var field = form.elements[element].value;
	return valid_day(field);
}

function valid_day (field) {
	if (isNumber(field)) {
		if (field < 1 || field > 31) {
			return false;
		} else {
			return true;
		}
	} else {
		return false;
	}
}

function check_year(form, element) {
	var field = form.elements[element].value;
	return valid_year(field);
}
	
function valid_year(field) {
	if (isNumber(field)) {
		if (field < 2000 || field > 3000) { // expected life of this script is 998 years
			return false;
		} else {
			return true;
		}
	} else {
		return false;
	}
}

function check_date(form, element) {
	var field = form.elements[element].value;
	var firstslash = field.indexOf("/");
	var month = field.substr(0,firstslash);
	var dayyear = field.substr(firstslash + 1, field.length);	
	var secondslash = dayyear.indexOf("/");
	var daystart = firstslash;
	var day = dayyear.substr(0,secondslash);
	var yearstart = firstslash + secondslash + 1;
	var year = field.substr(yearstart+1,field.length);
	if (valid_month(month) && valid_day(day) && valid_year(year)) {
		return true;
	} else {
		return false;
	}
}

function check_req(form, element) {
	var field = form.elements[element].value;
	if (field.length > 0) {
		return true;
	} else {
		return false;
	}
}

function isNumber (num) {
    for (i = 0; i < num.length; i++) {   
        var c = num.charAt(i);
		if (isNaN(c)) {
			return false;
		}
    }
	return true;
}

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									<span id="bar"><a href="/"><font face="Verdana" color="#0505C0" size="1">Home</font></a><span><font face="Verdana" color="Black" size="1">&nbsp;>&nbsp;&nbsp;</font></span><a href="/tools"><font face="Verdana" color="#0505C0" size="1">Tools</font></a><span><font face="Verdana" color="Black" size="1">&nbsp;>&nbsp;&nbsp;</font></span><span><b><font face="Verdana" color="Black" size="1">form_validation.js</font></b></span></span>
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<style>

/* For myHood */

.AddToMyHood{
	font-family:Verdana,Geneva, Arial;
	font-size:8pt;
}

/* END For myHood */
</style>



<table border=0 cellpadding=0 cellspacing=0 width=100% align=right>
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											&nbsp;&nbsp;
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											<span id="lblTitle">form_validation.js</span>
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														Stats
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																	&nbsp;&nbsp;<span id="lblRating">Rating: 4.33 out of 5 by 6 users</span>
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																	&nbsp;&nbsp;<span id="lblSubmitted">Submitted: 11/26/02</span>
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											<a id="hlAuthorName" class="ToolDetAuthorName" href="/public.aspx?user_id=00037FFE855E1FE5">Michael McClain</a>
											(<a id="hlAuthorEmail" class="ToolDetAuthorEmail" href="mailto:mmcclain+devhood@ccs.neu.edu">mmcclain+devhood@ccs.neu.edu</a>)
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														Download This Tool:
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<a id="myDownload" Login="false" href="javascript:__doPostBack('myDownload','')"><a href="javascript:__doPostBack('myDownload$_ctl0','')">form_validation.js</a></a>
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														<span id="lblBody">This is a javascript file that checks fields on submit. It shows all the errors at once, avoiding the fix one problem, get a new alert for a previously unknown problem style.<br><br>I wrote this myself in a morning, but I must admit I got some good ideas from the following existing scripts:  Form Validator 2.0 by Art Lubin and Form Chek by Eric Krock<br><br>I submitted this after seeing another javascript validator on devhood which I thought was cool, but this was cooler.<br></span>
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					<span class=helpful>low quality&nbsp;</span>
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					<span class=rank> 1</span>
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					<span class=rank> 4</span>
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					<span class=rank> 5</span>
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					<span class=helpful>&nbsp;high quality</span>
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								A good one.  Thanks. I find it really useful to give out as an example in teaching my javascript class. <br>
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								--
								<a href=/Public.aspx?user_id=000149505AAFE2F7>Yusno Yunos</a>
								,
								February 25, 2003
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