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JavaScript - Functions Help
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 Similar TutorialsHi, 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. 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. 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> 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>
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);
}
. Why do we have functions without parentheses at times? Ex 1) http://www.youtube.com/watch?v=OHYFNDzlDTE (On 2:18) Ex 2) At the bottom: Code: var panel, flag;
function mousemoveResponse(e)
{
var x, y;
if( window.event )
{
x= event.x; y=event.y;
}
else if(e)
{
x=e.pageX; y=e.pageY;
}
if(flag)
{
panel.innerHTML = "Mouse is at X: " + x + ", Y: " + y ;
}
}
function mouseoverResponse()
{
flag = false;
panel.innerHTML = "Mouse is Over";
}
function mouseoutResponse()
{
flag = true ;
}
function init()
{
panel=document.getElementById("panel");
flag = true;
panel.innerHTML="Move the mouse..." ;
document.onmousemove=mousemoveResponse;
panel.onmouseover=mouseoverResponse;
panel.onmouseout=mouseoutResponse;
}
onload=init;
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 hey , i got 2 function , the one working and the other one is'nt heres the functions : Code: var toDisplay = "f";
function human(){
var toAdd = toDisplay.substring(0,1);
setTimeout(human , 500);
document.getElementById('box').innerHTML += toAdd;
}
human(); // works (display "f" every half a sec)
function human2(toDisplay2){
var toAdd = toDisplay2.substring(0,1);
var t = setTimeout("human2(toDisplay2)" , 500);
document.getElementById('box').innerHTML += toAdd;
}
human2("dsd"); // not working (only display "d" and stop)
the first function works ( keep printing "f" every 0.5 sec ) the second function only work once and than stop ( print "d" and than stop ) what's the problem with the second function? thanks , Mor. I'm tryingto make a button where, when you click the button, a variable will increase and refresh (reload the number displayed, but one number higher. Here is what I have: Code: <html> <head> </head> <body> <script type="text/javascript"> x=1 document.write(x) </script> <input type="button" value="Up" onclick="document.write (++ x) "> <input type="button" value="Down" onclick="document.write (-- x)"> <input type="button" value="Reload" onclick="history.go(0)"> </body> </html> The problem with this is: When you hit the "up" button, everything on the page dissapears and it just outputs "2". All the buttons and stuff dissapear? There must be a better way to do it. And would I need to use a database. Any help? Hi all, I am trying to pass some dynamic values for use with javascript or more specifically AJAX... I had a set up looking something like the following; Code: <input type="button" onclick="ajaxFunction()" value="Add Favourite"/> <input type="text" name="school_id" id="school_id" value="<?php echo $school_id; ?>" /> <input type="text" name="teacher_id" id="teacher_id" value="<?php echo $teacher_id; ?>" /> Code: <script language ="javascript" type="text/javascript">
<!--
//Browser Support Code
function ajaxFunction(){
var ajaxRequest; // The variable that makes Ajax possible!
try{
// Opera 8.0+, Firefox, Safari
ajaxRequest = new XMLHttpRequest();
}catch (e){
// Internet Explorer Browsers
try{
ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
}catch (e) {
try{
ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
}catch (e){
// Something went wrong
alert("Your browser broke!");
return false;
}
}
}
// Create a function that will receive data
// sent from the server and will update
// div section in the same page.
ajaxRequest.onreadystatechange = function(){
if(ajaxRequest.readyState == 4){
var ajaxDisplay = document.getElementById('ajaxDiv');
ajaxDisplay.value = ajaxRequest.responseText;
}
}
// Now get the value from user and pass it to
// server script.
var school_id = document.getElementById('school_id').value;
var teacher_id = document.getElementById('teacher_id').value;
var queryString = "?sid=" + school_id;
queryString += "&tid=" + teacher_id;
alert(queryString);
ajaxRequest.open("GET", "ajax_insert_favourite.php" + queryString, true);
ajaxRequest.send(null);
}
//-->
</script>
however because it is possible for there to be more than one button, i.e. many teachers can be returned the javascript would also output 1 and 1. I need someway of making this unique to the id's... I think that passing arguments/params might be the solution but I'm having a hard time implementing it; I've tried the following; Code: <input type="button" onclick="ajaxFunction('school_id','teacher_id')" value="Add Favourite"/>
Code: <!--
//Browser Support Code
function ajaxFunction(school_id,teacher_id){
But once I do this, it no longer even make the call. Can anyone advise here, I'm a relative newbie to javascript/AJAX etc. Many thanks, Greens85 I've been trying to bind two functions together without success: I want an autocomplete to run on input fields that are added when the user clicks on "add". I can get the two to run separately and have figured out that I should be binding the two functions...but as a noob, I'm almost sure I'm doing it wrong. Any help is appreciated!! here is the autocomplete code: Code: <script type="text/javascript">
var J = jQuery.noConflict();
J(document).ready(function(){
J('#professor').autocomplete({source:'autocomplete.php', minLength:1});
});
here is the addinput code: Code: var J = jQuery.noConflict();
J(document).ready(function(){
J("#addproffield").click(function(){
var input = J("<div class='added-field'><input type='text' name='professor[]' id='professor' size='25' value='' /> <a href='' class='remove-btn'>Remove field</a></div>");
J("#addprof").append(input);
});
J(".remove-btn").live('click',function() {
J(this).parent().remove();
});
});
here is my attempt to bind the two: Code: var J = jQuery.noConflict();
J(document).ready(function(){
J("#addproffield").click(function(){
var input = J("<div class='added-field'><input type='text' name='professor[]' id='professor' size='25' value='' /> <a href='' class='remove-btn'>Remove field</a></div>");
J("#addprof").append(input);
input.professor({
source:'autocomplete.php', minLength:1
});
});
J(".remove-btn").live('click',function() {
J(this).parent().remove();
});
});
Still looking for a ways to consolidate multiple instances of a function... Here's the current one: instance: Code: <div class="hex" onmouseover=" onV('N03') ">
<p id="Labbbab6">_ _</p>
<p id="Labbbab5">___</p>
<p id="Labbbab4">_ _</p>
<p id="Labbbab3">_ _</p>
<p id="Labbbab2">_ _</p>
<p id="Labbbab1">___</p>
<p class="hN" id="N03" > 3</p></div>
(and do it 64 times...) root function: Code: function onV(id){
var v=document.getElementById(id).style;
v.visibility=="hidden"?v.visibility="visible":v.visibility="visible"}
css: .hN {position:relative; visibility:hidden} It could be done by changing the visibility of class"hN" from 'hidden' to 'visible'; and maybe it could be done by making class "hex" last-child visible. Whichever way, the function needs to be attached to the class. I can see what needs to be done, but have difficulty writing: any help appreciated, and credited. cheers Okay, here is my assignment: reate an HTML document with 2 JavaScript functions as described below. Call the document useparameters.html The first function will use a parameter for the Width of a horizontal rule. When called, the function will draw a horizontal rule of a width specified by the Functions argument. Prompt the user for the pixel width information. The second function will use parameters for two heading sizes. The parameters will be used for the size of the text that will be displayed on the first line and the size of the text that will be displayed on the second line. The heading size will be different on the first and second lines. Prompt the user for these two headings as well (one prompt for each). The body of the HTML document will contain a page heading and call the two functions you created, displaying a horizontal rule and two lines of text which will be formated based upon the parameters the user entered into the prompts. Here is my code: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>Use Parameters</title> <script type="text/javascript"> <!-- var hrsize var htwosize var psize function bar() { hrsize = window.prompt( "Please enter the size you want your horizontal rule to be (in pixels)", 50 ) hsize = hrsize document.write("<HR ALIGN='left' width=" + hrsize + ">"); } function output() { htwosize = window.prompt( "Please enter the size you want your heading to be (in pixels)", 18 ) htwosize = htwosize document.write("<h2" + htwosize + "/h2>") } function output() { psize = window.prompt( "Please enter the size you want your paragraphcs to be (in pixels)", 12 ) psize = psize document.write("<p" + psize + "/p>") } --> </script> </head><body> <script type="text/javascript"> <!-- bar(hrsize) output(htwosize) output (psize) --> </script> <h2>JavaScript Rules!</h2><p>Using JavaScript is fun! </p> <p> This is some standard HTML, unlike the above which was generated with javaScript.</p> </body> </html> What am I doing wrong? Hello, I have a very large function that activates on one click. It does many individual events that modify my site. They all work seperately but when I put them in a single function they all break. Is there a way, order or priority for putting large things of code in functions? I tried doing {} blocks but it didn't help. I need to create a function with named getFontSize() needs one parameter named "id" and id is value of object in document then to create a variable named object to represent object return font size of text in object use style object to retrieve font size and use parseInt() function to get value of font size this is the code i came up with Code: function getFontSize(id) {
// Returns the font size of the object with the value id
var object=document.getElementById(id);
fontsize=parseInt(object.style.fontSize);
return(fontsize);
}
What should i change to make work/ Hi, new to this forum but have a quick question about arrays, I've been working on this all night, and I'm at a loss. I'm trying to calculate the gpa of a user by using arrays and functions. Everything seems to be working besides two things.
The array that contains the class names (className[]) always includes an extra two variables: my sentinel value which is finish, and "undefined"
The arrays at the end won't produce a number when multiplied together. creditData[] and qualityPoints[].
Also, if you have any suggestions on my code, I'd appreciate it. <script type="text/javascript"> <!-- /**************************************************************** ** PrintExplanation - prints a message containing instructions to the user without ** any variable needed. ** Inputs:None ** Outputs:None ****************************************************************/ function PrintExplanation() { alert("This program will calculate your Grade Point Average for any given semester. Please enter only graded classes, no Pass/Fail Classes."); } /**************************************************************** ** GetValidNumberInput - Error checks a number between two constraints. ** Inputs: promptString - allows the user to insert a string in order to be asked. ** lowerNum - the lower constraint you want to be compared. ** upperNum - the higher constraint you want to be compared. ** Outputs: numCredits ****************************************************************/ function GetValidNumberInput(promptString, lowerNum, upperNum) { var promptString; var lowerNum; var upperNum; var numCredits; numCredits=prompt(promptString); while(numCredits<lowerNum || numCredits>upperNum) { numCredits=prompt(promptString); } numCredits=parseFloat(numCredits) return numCredits } /**************************************************************** ** CalculateGPA - Calculates the users GPA ** Inputs: totalCredits: The total amount of credits determined by the user. ** totalQualityPoints: The total amount of quality points determined by the user. ** Outputs: gpa - the users final grade point average. ****************************************************************/ function CalculateGPA(totalCredits, totalQualityPoints) { var totalCredits; var totalQualityPoints; var gpa; gpa=totalQualityPoints/totalCredits return gpa; } function GenerateGPAReport(totalCredits, totalQualityPoints) { } /**************************************************************** ** ConvertGradeToPoints - Converts a letter given by the user into a number corresponding to grade points. ** Inputs: grade - the letter of the grade the student recieved in the course. ** Outputs: points - the number value of the grade that was input by the user. ****************************************************************/ function ConvertGradeToPoints(grade) { var grade; var points; if(grade == "A" || grade== "a") { points=4 } else if(grade == "B" || grade == "b") { points=3 } else if(grade == "C" || grade == "c") { points=2 } else if(grade == "D" || grade == "d") { points=1 } else if(grade == "F" || grade == "f") { points=0 } points=parseFloat(points); return points; } //--> </script> </head> <body> <script type="text/javascript"> var promptString; /*Declares Variables*/ var className; var numOfClasses; var grade; var semester; var numCredits; var lowerNum=1; var upperNum=4; var class1; var i=0; var counter=0; var totalCredits=0; var totalPoints=0; var grade; var counterCredits=0; var counterGrade=0; var points; var gpa; var qualityPoints; var creditData; var gradeData; var x=0; var totalQualityPoints=0; PrintExplanation(); var className = new Array(i); semester=prompt("Please enter the semester you would like to calculate your GPA for."); document.write("Grade report for " + semester + "<br />"); while(class1!="finish") /*Stores the names of the classes taken into an array*/ { class1=prompt("Enter the Class name, or finish to end"); className[i]=class1 i++ } while(counter<=i) /*writes the classes in the array from top to bottom*/ { document.write(className[counter] + "<br />"); counter++ } var creditData = new Array(i) while(counterCredits<=i) /*counts the total number of credits for all the classes*/ { numCredits=GetValidNumberInput("How many credits is " + className[counterCredits] + " class worth?",1,4) creditData[counterCredits]=numCredits totalCredits=totalCredits + numCredits counterCredits++ totalCredits=parseFloat(totalCredits); } var gradeData = new Array(i) /*collects information about grades in an array*/ while(counterGrade<i=) { points=prompt("What grade did you recieve in " + className[counterGrade] + "?"); points=ConvertGradeToPoints(points) gradeData[counterCredits]=points totalPoints=totalPoints+points counterGrade++ } while(x<=i) { qualityPoints=creditData[x]*gradeData[x] totalQualityPoints=totalQualityPoints + qualityPoints x++ } gpa=CalculateGPA(totalCredits, qualityPoints) document.write(gpa); </script> </body> I'm trying to create a script that has a countdown and at each second, a div is created on the page with some content. How to run both functions at the same time at the click of a button? Thanks to the answer!
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