JavaScript - Help With Functions And Arguments

Let's say I'm defining an object and I want the constructor to take one input and ten save it. I'd like to do something like this:

function apple(color) {
this.color = arguments.color;
}

But of course that doesn't work because arguments isn't a scope. My question is, is there a scope I can use. What I've been doing instead is this:

function apple(new_color) {this.color = new_color;}

But that just seems less than perfectly pretty.

Hi,

I have written a number of functions designed to return frequency data on 1000 randomly chosen numbers using different math functions for the rounding. I would like to include all of these functions within the wrapper of another function so that only one call is needed to get returns from all of the 'inner' functions. However, while each of the functions works in isolation, the moment I wrap them in another function they stop working.

The following code is one of the functions 'frequencyWrapperOne' that has been wrapped in the function 'testWrapper'. A call to testWrapper does nothing. Can anyone see what I'm doing wrong?

Code:

function testWrapper()
{

function frequencyWrapperOne()
{
	var numberArrayOne = new Array(0,0,0);
	for (var i = 0; i < 1000; i = i + 1)
	{
		var chosenNumber = Math.floor(Math.random() * 3); 
		if (chosenNumber == 0)
		{
			numberArrayOne[0] = numberArrayOne[0] + 1;
		}
			if (chosenNumber == 1)
			{
				numberArrayOne[1] = numberArrayOne[1] + 1;
			}
				if (chosenNumber == 2)
				{
					numberArrayOne[2] = numberArrayOne[2] + 1;
				}
					
	}		
	return window.alert(numberArrayOne.join(','));
	
}
}	
testWrapper();

Thanks.

Hi all,

I have a newbie question. I have just started working with javascript and would appreciate some guidance.
I have a webpage and there are products for sale on it(this is not live it is merely being used as practice project). Beside each product is a description a price and an 'add to cart' button.

My cart is simply a div with an id of 'cart' and it has a text box within it. I need the product name to be displayed within the div (this, I have working), I also need to display the product price in the text box once the button(add to cart ) for that particular product has been pressed.
Also when the button for another product is pressed, I want the cost/value for that product to be added to the other value and displayed in the text box in the cart div...

I apologise for rambling on but this is the best way of me explaining my needs....

Here's where i am right now..
The HTML snippet

Code:

<div id ="cart">
    		<p><img src="images/shopping-cart.png"  alt ="cart"/>Your Cart</p>
            
            	<div id="sum"><!--(this is the div where the total goes)-->
					<input type="text" id="total" value="0" /><p>&euro;&nbsp; Your Total &nbsp;<input type="reset" value = "reset" /></p>
                 </div>
    	</div>

<h2 id ="black">Blackcurrent<br /></h2>
        <p>&euro; 12.00 <input type = "submit" value ="add to cart"  onClick = "shoppingCart('Blackcurrent',12)" /></p>

And the javascript:

Code:

alert ("working");

function shoppingCart (itemName,itemValue)
{
/*	var thePrice = Number(itemValue);
	return thePrice;*/
	document.getElementById ("cart").innerHTML += itemName  + "<br/>";
	document.getElementById('total').value = Number(document.getElementById('total').value) + itemValue;
	
		
}

I hope i have posted correctly and am aware that i have only posted a segment of the HTML..

Please let me know if you need any more code or info..

Thanks a lot in advance for any help...

I have a project that uses and Ajax call but it appears that the call back
function cannot take arguments, nor return values. However, I have
wrapped another function inside the call back function that takes
xmlhttp.responseText as the argument and returns values that are
supposed to be placed in a global array.
If I do, for instance:
callback function code....
globalArray = someFunction(xmlhttp.responseText)
alert(globalArray), I get the expected values.
but a function is called later to query the contents of the global array
the global array is empty (No other code or functions exist in this
project to alter the global array)
Primary dev client is FireFox 3x on Mac OSX
Is this a bug, or is there some other aspect of javascript that I need to
know about?

I am using ajax here because javascript does not have an array shuffling
function and php does. So I send an array to the server, have it shuffled
by the server and returned to the requesting page.

Code:

<html>
<head>
<title>Variable - Examples 1</title>
   <script type="text/javascript">
	function Student(firstName, lastName, email, courseID, titleArray, pointsArray){
		this.firstName = firstName;
		this.lastName = lastName;
		this.email = email;
		this.courseID = courseID;
		this.title = titleArray;
		this.points = pointsArray;
 		this.assign = this.points.slice(0,4);
		this.exams = this.points.slice(-2); 
		this.assignments = function() { return task(this.title,this.points); }
		this.totalPoints = function() {return addExam(this.assign,this.exams); }
		this.finalGrade = calcGrade;
	}
	
	Student.prototype = {
		constructor : Student,
		toString : studentInfo
	};
	
 //assign and exam doesn't seem to hold no values inside.. ???	 
 	function addExam(assign,exams){
		var exams=this.exams;
		var high1=exams[0];
		var high2=0;
		while(high2<exams.length){
			high1=Math.max(high1,exams[high2]);
			high2++;
		}
		var sum = 0;
		for (var i=0; i < assign.length; i++){
			sum += assign[i];
		}
		return sum + high1;	
	} 
	var totalPoints = addExam();
	
	function calcGrade(){
		var grade;
		if (totalPoints >= 190){
			return "A+";
		}else if (totalPoints >= 180){
			return "A";
		}else if (totalPoints >= 175){
			return "B+"
		}else if (totalPoints >= 170){
			return "B";
		}else if (totalPoints >= 165){
			return "B-";
		}else if (totalPoints >= 160){
			return "C";
		}else if (totalPoints >= 150){
			return "D";
		}else if (totalPoints < 150){
			return "F";
		}
	}
	
	function studentInfo(){
			 return "Student : " + this.lastName + "," + this.firstName + "<br>"+ "eMail : " + this.email + "<br>" + "Course ID : " + this.courseID + "<br>" + "--------------------------------" + "<br>" + this.assignments() +  "--------------------------------" + "<br>" + "Total Points : " + this.totalPoints() + "<br>" + "Final Grade : " + this.finalGrade();
	}
	
 	function createStudents(){
		var student1 = new Student("Jake", "Hennry", "jhennery@gmail.com","COIN-070B.01", ["Assignment1","Assignment2","Assignment3","Assignment4","Assignment5","MidTerm", "Final"], [25, 25, 28, 20, 29, 40, 40] );
		alert("Student : " + student1.lastName + "," + student1.firstName + "\n"+ "eMail : " + student1.email + "\n" + "Course ID : " + student1.courseID + "\n" + "---------------------------------------" + "\n" + student1.assignments() +  "\n" + "---------------------------------------" + "\n" + "Total Points : " + student1.totalPoints() + "\n" + "Final Grade : " + student1.finalGrade());
	}
	 
	var titleArray = ["Assignment1","Assignment2","Assignment3","Assignment4","Assignment5","MidTerm", "Final"];
	var pointsArray = [30, 30, 28, 27, 29, 41, 45];
	var student = new Student("Haripriyaa", "Ganesan", "haripriyaa@gmail.com","COIN-070B.01", titleArray, pointsArray );
   </script>
</head>
<body>
	<script type="text/javascript">    
		document.writeln(student.toString());
	</script>
</body>
</html>

Ok here is what I have so far, my ending part of my Call Function I think is ok.

for my main function. I think I misplaced the { and }

I will show you all the codes I have

for my main function

this is what I have


I think I did misplace something but I can not pin point where that one small things should be


Code:

unction showResults(race,name,party,votes)
	{ 					// script element to display the results of a particular race
var totalV = totalVotes(votes);
document.write("<h2>" + race + "</h2>");
document.write("<table cellspacing='0'>");
document.write("<tr>");
document.write("<th>Candidate</th>");
document.write("<th class ='num'>Votes</th>");
document.write("<th class='num'>%</th>");
document.write("</tr>");
	}
	
	
for (var i=0; i < name.length; i++)
{
document.write("<tr>");
document.write("<td>" name[i] + "(" + party[i] + ")</td>");
document.write("td class='num'>" + votes[i] + "</td>");
 
var percent=calcPercent(votes[i], totalV)
 
document.write("<td class='num'>(" + percent +"%)</td>");
 
createBar(party[i],percent)
document.write("</tr>");
}
document.write("</table>");
}
</script>

Just wondering if i misplaced any ; or { or } anywhere suggestions?


Here is my call function
Code:

<script type="text/javascript">
	
showResults(race[0],name1,party1,votes1);
showResults(race[1],name2,party2,votes2);
showResults(race[2],name3,party3,votes3);
showResults(race[3],name4,party4,votes4);
showResults(race[4],name5,party5,votes5);
  
</script>

I been going over this, I can not seem to figure out what { i might be missing?
Thanks

Is there a way to activate a function from another function? It has to be in the script tag, it can't be in the HTML section. Can I use something similar to this following code? If not, can anyone give me some help? I have tried to do it various ways, and have looked it up a few times, but to no avail. Can I use something similar to this following code? If not, can anyone give me some help?

if (condition)
{activate functionname();}

Any help I can get would be appreciated. Thanks a lot to anyone who can help.

Can anyone put into "simple" words the purpose of arguments in JS please?

I would really like to thank the guys that have been helping me. I think my brain would have exploded otherwize. Some of the problems have been simple misspellings, but when you have been staring at the same thing for hours it can sorta slip by.

HOPEFULLY this will be the last thing that I need some help with.

Bascially Im not sure if Im using the function command properly. When Submit Details is click it should validate the form and then when Calculate is pressed calculate the form (obviously).

I think maybe my var Array table is wrong? And the way the functions are set out doesnt seem it sit right.

Code:

 <script type="text/javascript">
				
				var element;
				var itemArray = new Array();
				itemArray [0] = "Bike"		//not sure if these are properly writen?//
				itemArray [1] = "TV"
				itemArray [2] = "iPod"
				itemArray [3] = "Car"
				var flag="OK";
				var count = 0
				
				document.write ("<form name='myform'><br><table>");
				while (count <= 3)
					{
					if (count < 3)
						{
						document.write ("<tr><td><value>Enter money from " + itemArray [count] + " sale.</td><td><input type='text' name=" + itemArray [count] + "></td></tr>");
						count++
						}
					else
						{
						document.write ("<tr><td><value>Enter the price of " + itemArray [count] + ".</td><td><input type='text' name=" + itemArray [count] + "></td></tr>");
						document.write ("<tr><td><input type='submit' value='Submit Details' onClick='validateform'</td></tr>");
						document.write ("<tr><td><input type='submit' value='Calculate Details' onClick='calculateform'</td></tr></table></form>");
						count++
						}
					}

function validateform()		//<=== doesnt run
{				
				element=document.getElementsByTagName ('input');
				for (counter=0; counter<element.length; counter++)
				{
					
					switch (element[counter].type)
						{
							case "submit":
							break;
							default:
							if (isNaN(element[counter].value) || (element[counter].value == "") )
								{
									alert("You need to enter a number into " + element[counter].name);
									flag="NotOK"
								}
							else
								{
									Bike=element[0].value;
									TV=element[1].value;
									iPod=element[2].value;
									Car=element[3].value;
								}
							break;	
						}
				}
}

function calculateform()	//<=== Doesnt run either
{
			if (flag=="OK")
				{
					if	(	(Number(element[Bike])) && (Number(element[TV])) && (Number(element[iPod])) && (Number(element[Car]))	)   //<========= Gets Bike is not defined error easy//
						{
						
						TotalMoney= parseFloat (Bike) + parseFloat (TV) + parseFloat (iPod)
						if 	(TotalMoney >= Car)
							{
							alert ("The total money is " + TotalMoney + " and the car price is " + Car + " and you can afford the car")
							}
						else
							{
							alert ("The total money is " + TotalMoney + " and the car price is " + Car + " and you cannot afford the car")
							}
						}
				}
}
		</script>

I need to input the functions for the buttons ( Push, Pop,Peek, Enqueue, and Dequeue) nothing I try works. Can anyone possible help me with one of the push, pop or peek, and then one of the Enqueue or Dequeue (any information I see online always has to do with wordpress which im not using) . Im really not asking for someone to do all the work for me, I just need a start. ok here is my code with the buttons just no functions


<html>
<head>
<title>COP2500 - Lab 9</title>
</style></head>
<body>
<center>
<h3><b>COP2500 Assignment 9</b></h3>

<b>Queue:</b>
<form name="queue">
<input type=text size=60 name="display"><br>
<input type=text size=5 name="entry">

<input type=button value="Enqueue" onClick="enqueue()">
<input type=button value="Dequeue" onClick="dequeue()">
</form>

<hr>
<b>Stack:</b>
<form name="stack">
<table>
<tr>
<td>Entry: <input type=text size=5 name="entry"><br>




<input type=button value="Push" onClick="push()"><br>
<input type=button value="Pop" onClick="pop()"> <br>
<input type=button value="Peek" onClick="peek()"><br>
</td>
<td><textarea name=display rows=20></textarea></td>
</tr>

</table>
</form>

</center>
<script language="JavaScript">
var myqueue = new Array();
var front;
var back;
front = 0;
back = -1;

var mystack = new Array();
var top;
top = -1;


function enqueue()
{
// This function should take the value from the 'entry' text box and
// add it to the back of the queue. The 'back' queue variable must be
// incremented.

// Since the queue changed, call the display function. Done.
display_queue();
}

function dequeue()
{
// This function should display the value of the 'front' element
// in the queue using the 'alert' function and then increment the value
// of the front variable.
// if the queue is empty, i need to say so.

// Since the queue changed, call the display function. Done.
display_queue();
}

function push()
{
// This function should add the value in the 'entry' text box to the stack,
// and then increment the value of the 'top' variable.

// Since the stack changed, call the display function. .
display_stack();
}

function pop()
{
// This function should use the alert function to display the top
// of the stack and then remove the top item from the stack.
// You can 'remove' the item simply by decrementing the value of 'top'.
// If the stack is empty, it needs to say so.

// Since the stack changed, call the display function. .
display_stack();
}

function peek()
{
// This function should use the 'alert' function to display the top
// of the stack but not change the stack. If stack is empty,it needs to say so.
}

// *****************************************************************
// Do not edit anything below this line. Use the functions as given.
// *****************************************************************
function display_queue()
{ var output;
var i;

output = " ";
for (i = back; i >= front; i--) output = output + myqueue[i] + " ";

document.queue.display.value = output;
}


function display_stack()
{ var output;
var i;

output="";
for (i = top; i > -1; i--) output = output + mystack[i] + "\n";

document.stack.display.value = output;
}



</script>
</body>
</html>

im no jQuery rookie

but for the first time ...instead of simply writing out the animation

jQuery('element').hide()

in that way.... i instead needed to keep track of the functions so i wrote it like

function hidetheElement() {
jQuery('element').hide()
}

but now i need to run 2 of those functions together after a click ...for example

jQuery('ClickedElement').click(
movethelement,hidethelement
)

see what i mean?....i dont know how to properly run two defined functions
whats the proper syntax....


and here is my actual code for reference
(its basically a menu link being clicked...hiding one page...and showing another....i needed to define the functions so if a menu link is clicked it could hide every other page first...by function....and then call a function to show the page


Code:

jQuery(document).ready( function() {
jQuery('#ladiesmenu').click(
previewoff,ladieson
);

function previewoff() {
	jQuery('#preview').fadeOut(500);
}

function ladieson() {
	jQuery('#ladies').fadeIn(500);
}

Hi,
I am creating a mashUp with google maps and have a function that creates the map, marker, infowindow and all works great.
I want to add more functions to that functions file.
Do I start with another function Name() put my function in the {} and then I am going to use the onclick event when I want the function to run.
I also am going to add more functions to this file

Is that the correct way to keep adding functions?

And what is the best way of calling them in my html file?

Answers and examples would be great

thank you

I'm a newbie student coder for now, hoping to enter the wonderful world of software engineering in another year.

I put together a very simple site for a class and all is well, but my "Contact SRS" form doesn't seem to want to run my JavaScript code even though I've used a JS debugger which returned no errors.

When I click the Submit button it's supposed to validate the form. But I keep getting "Error on page" in the bottom IE 7 message bar (where it usually says "Done" when you load a page). There is another function that also does not work - it's in the Telephone number fields - it' supposed to check that the values entered are numbers.

Would anyone be kind enough to try to run this page in your browser and see if the validation functions runs for you? If they don't, could you offer any suggestions as to code errors or possible browser settings that might be causing the problem?

Thanks in advance to anyone offering their time!!!


Code:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>
	<meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />
	<meta name="description" content="Page used to contact SRS" />
	<meta name="keywords" content="resume, resumes, job, jobs, job market, job info, interview tips, job interview, salary,
	salaries, cover letter, cover letters, SRS, Superior Resume Source, business cards, help with resume, help with job search" />

	<title>Contact SRS</title>
	<link rel="stylesheet" href="style.css" type="text/css" media="screen" />

	<script type="text/javascript">/* <![CDATA[ *//* ]]> */	

		function checkForNumber()
			{
                			if (isNan(document.forms[0].area.value)){alert("You must enter a numerical value");return false;}
				else if (isNan(document.forms[0].exchange.value)){alert("You must enter a numerical value");return      false;}
	    			else if (isNan(document.forms[0].phone.value)){alert("You must enter a numerical value");return false;}
			 }

//		function validateForm ()
//			{
//                		if(document.forms[0].firstname.value==""){alert("You must enter your first name.");return false;}}
//            			}
//			     else if(document.forms[0].lastname.value== ""){alert("You must enter your last name.");return false;}
//			     else if(document.forms[0].address1.value== ""){alert("You must enter your address.");return false;}
//			     else if(document.forms[0].city.value== ""){alert("You must enter a city.");return false;}
//			     else if(document.forms[0].state.value== ""){alert("You must enter a state.");return false;}
//			     else if(document.forms[0].zip.value== ""){alert("You must enter your zip code.");return false;}
//			     else if(document.forms[0].area.value== ""||document.forms[0].exchange.value== ""||document.forms[0].phone.value== "")
//			     {alert("You must enter a complete phone number.");return false;}}
//			     else {alert('Thank you! SRS will contact you within one business day.');}}
			     
        function isEmpty(strfirst, strlast, straddress, strcity, strstate, varzip) 
            {

                strfirst = document.forms[0].firstname.value 
                strlast = document.forms[0].lastname.value
                straddress = document.forms[0].address1.value
                strcity = document.forms[0].city.value
                strstate = document.forms[0].state.value
                varzip = document.forms[0].zip.value

              //name field
                if (strfirst == "" || strlast == null || strfirst.charAt(0) == ' ')
                {
                alert("\"First Name\" is a mandatory field.\nPlease amend and retry.")
                return false;
                }

              //last name field 
                if (strlast == "" || strlast == null || strlast.charAt(0) == ' ')
                {
                alert("\"Last Name\" is a mandatory field.\nPlease amend and retry.")
                return false;
                }

              //address field 
                if (straddress == "" || straddress == null || straddress.charAt(0) == ' ')
                {
                alert("\"Address\" is a mandatory field.\nPlease amend and retry.")
                return false;
                }
                return true;
                }
    
                //city field 
                if (strcity == "" || strcity == null || strcity.charAt(0) == ' ')
                {
                alert("\"City\" is a mandatory field.\nPlease amend and retry.")
                return false;
                }

               //state field 
                if (strstate == "" || strstate == null || strstate.charAt(0) == ' ')
                {
                alert("\"State\" is a mandatory field.\nPlease amend and retry.")
                return false;
                }
            }
            
            function check(form)){
                if (isEmpty(form.firstname)){
                  if (isEmpty(form.lastname)){
                    if (isEmpty(form.address1)){
                    if (isEmpty(form.city)){
                    if (isEmpty(form.state)){
                      }
                      }
                	  }
                    }
                }
                return false;
                }

	</script>


</style>

</head>

<body>

	<a name="top"></a> 

	<div id="container">

		<div id="header">
			<h1></h1>
		</div>

		<div id="content">
			<h2>Contact SRS</h2>
			
			<p>Use this page to contact SRS and/or order products and services.  Refer to our <a href="services.htm">Services</a> page for pricing.</p>

			<p><strong>Remember, our work is guaranteed or your money back!</strong></p>

		</div>

		<div id="sidebar">
			
			<ul>

				<li><a href="index.htm">Home</a></li>
				<li><a href="about.htm">About SRS</a></li>
				<li><a href="services.htm">Services</a></li>
				<li><a href="contact.htm">Contact SRS</a></li>
			</ul>


			
			<div class="widget">
				Did you know that employers prefer CV's that are limited to three pages or less?
			</div>
			
			<div class="widget">
				First impressions last a lifetime... write a Thank You letter EVERY time!
			</div>
			
			<div class="widget">
				Want to know your personality type?  Take this FREE <a href="http://www.careerfulfillment.com/?hop=daviduk"> personality test.</a>
			</div>

			
		</div>

	</div>
	<form method="get" enctype="application/x-www-form-urlencoded">



		<table border="0">

			<tr>
				<td id="contact table" valign="top">
					<h3><strong>Contact SRS</strong></h3>
					
					<p><strong>* Required</strong><p>

					<p>First Name*<br />
						<input type="text" name="firstname" size="50" />
					</p>

					<p>Last Name*<br />
						<input type="text" name="laststname" size="50" />
					</p>

					<p>Address*<br />
						<input type="text" name="address1" size="50" /><br />
						<input type="text" name="address2" size="50" />
					</p>

					<p>City, State, Zip*<br />
						<input type="text" name="city" size="34" />
						<input type="text" name="state" size="2" maxlength="2" />
						<input type="text" name="zip" size="10" maxlength="10" onchange="return checkForNumber;" />
					</p>

					<p>Telephone*</p>
					<p>(<input type="text" name="area" size="3" maxlength="3" onchange="return checkForNumber;" />)
						<input type="text" name="exchange" size="3" maxlength="3" onchange="return checkForNumber;" />
						<input type="text" name="phone" size="4" maxlength="4" onchange="return checkForNumber;" /></p>
	
					<strong>Check the reason(s) for your inquiry?*</strong>
					<p><input type="checkbox" name="geninquiry" value="General_Inquiry" />General Inquiry <br/>
					<input type="checkbox" name="help" value="Help" />Help<br/>
					<input type="checkbox" name="new_resume" value="Order New Resume" />Order a New Resume <br />
					<input type="checkbox" name="Update_resume" value="Update My Resume" />Update My Resume <br/>
					<input type="checkbox" name="cover_letter" value="Order Cover Letter" />Order a Cover Letter <br /></p>

					<textarea rows="10" cols="50">Type your comments here</textarea>

					<p><input type="button" name="Submit" value="Submit" onsubmit="return check(this);" />     <input type="reset" /></p>
				
				</td>
			</tr>
		</table>
	</form>
	
<a href="#top">Back to Top</a><br />

</body>

</html>

Code:

<html>
<head>


<script>
//declare variable
//var temp = 0;
var Num = parseInt(prompt('Enter an Intger'));


// starts the function factorial
factorial(Num);

//The function is declared
function factorial(currentNumber) {

  if(currentNumber > 1) {
      //temp = temp + (currentNumber);
      factorial(currentNumber - 1);
      alert(currentNumber);
  }
  else {
      alert("here");
  }
}
</script>

</head>

<body>
</body>

</html>

This code is suppose to take the prompt number and keep subtracting one if > 1 but it seems to be not doing that at all and doing the else statement first then + till it gets to the prompt number. I have been staring at it for a while now and cant work it out.

Thanks