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JavaScript - How Do I Multiply Two Matices In Javascript
Hi im new in javascript and im having some problems with the two dimensional arrays problems.
Well basically what i need to do in this program its to multiply two matrices of the same length and print the result as a matrix Example [2 4] * [3 8] = [14 20] [3 2] [2 1] [13 26] I hope someone could help me im really stuck in this problem Similar TutorialsHi, At www.happydaysremovals.com.estimatenew.html. Users fill in a form which has items of furniture, so they enter a number next to each item of furniture. The HTML uses text fields. When the form is submitted, the form is submitted to a php script that emails the results to myself. I am trying to also have a javascript function which runs before the php script runs. This javascript works out the cubic footage of all the items. If a user put "3" in the sofa text field, and I have defined that a sofa is 45 cubic feet, then the javascript will multiply 3 * 45. It will do a similar thing for all items of furniture, then add them all up to give a total cubic feet. I want that total field to then sent as a variable to the php script, along with all the other variables. My code so far (which doesnt work) Code: <script language="JavaScript">
function calculate()
{
var sofa_3_seater = document.getElementById('sofa_3_seater').value*45;
var sofa_2_seater = document.getElementByID('sofa_2_seater').value*30;
var armchair_large = document.getElementByID('armchair_large').value*15;
var total=sofa_3_seater+sofa_2_seater+armchair_large;
document.getElementByID('total').value = total;
}
</script>
I have used a hidden field for the total value: Code: <input type="hidden" name="total" value=""> I want the javascript result to change the value of the hidden field that is called total. THen I want it all to be posted to the PHP script and email everything to me, including this newly calculated total field! THanks Code: <script>
// Declared Constants
MORSE_ALPHABET = new Array (
'.-', // A
'-...', // B
'-.-.', // C
'-..', // D
'.', // E
'..-.', // F
'--.', // G
'....', // H
'..', // I
'.---', // J
'-.-', // K
'.-..', // L
'--', // M
'-.', // N
'---', // O
'.--.', // P
'--.-', // Q
'.-.', // R
'...', // S
'-', // T
'..-', // U
'...-', // V
'.--', // W
'-..-', // X
'-.--', // Y
'--..' // Z
);
CHAR_CODE_A = 65;
var CTS = prompt('Enter Morse code','here')
var inMessage = CTS.split(' ');
searchLocation(inMessage,MORSE_ALPHABET)
function searchLocation(targetValue, arrayToSearchIn) {
var searchIndex = 0; // Iterative counter
for(i=0;i < targetValue.length;) {
targetValue = targetValue[i];
// Search until found or end of array
while(
searchIndex<arrayToSearchIn.length &&
i != targetValue.length &&
arrayToSearchIn[searchIndex]!=targetValue
) {
i++
searchIndex++;
}
if(searchIndex<arrayToSearchIn.length) {
return String.fromCharCode(CHAR_CODE_A + searchIndex);
}
else {
return -1;
}
}
}
document.writeln(searchLocation(inMessage,MORSE_ALPHABET));
</script>
<head>
</head>
<body>
</body>
This is my code and i have figured it to create an array from the prompt and then use the function to return the first array it finds but i cant seem to make it go on to the next index of the array. I know that when you return a value the function closes and i have tried to store my return in a variable but its not working the way i want it to or I'm not writing the correct command or is there away to do multiply returns, i think what i need to do is simply but i have been staring at this screen for a while now and just cant see it. Please help me. Thanks Hi all... i need to auto calculate 3 fields and store the result in 2 fields: field 3 = field 1 * field 2 field 5 = (field 1 * field 2) - field 4 or field 3 - field 4 so far i'm trying to modify an existing code but i'm still can't get it working correcly Code: <html>
<head>
<script type="text/javascript">
function compute(inputObj, otherInputID, multiID, subID, diffID) {
var otherObj = document.getElementById(otherInputID)
var multiObj = document.getElementById(multiID)
var subObj = document.getElementById(subID)
var diffObj = document.getElementById(diffID)
var v1=inputObj.value
var v2=otherObj.value
var v3=multiObj.value
var v4=subObj.value
var val1 = v1=="" ? 0 : parseFloat(v1) // convert string to float
var val2 = v2=="" ? 0 : parseFloat(v2)
var val3 = v3=="" ? 0 : parseFloat(v3)
var val4 = v4=="" ? 0 : parseFloat(v4)
multiObj.value = val1 * val2
diffObj.value = (val1 * val2)-val4
}
</script>
</head>
<body>
Value 1: <input id="txt1" type="text" onKeyUp="compute(this, 'txt2', 'addres', 'subtract', 'mulres')">
<br />
Value 2: <input id="txt2" type="text" onKeyUp="compute(this, 'txt1', 'addres', 'subtract', 'mulres')">
<br />
Added Result: <input id="addres" type="text">
<br />
substract: <input id="subtract" type="text" onKeyUp="compute('txt1', 'txt2', 'addres', this, 'mulres')">
<br />
Multiplied Result: <input id="mulres" type="text">
</body>
</html>
my problem is the Multiplied Result field not automatically change the result when i enter value in subtract field. it will change if i retype the value in field 1 and 2. Hope somebody can help me. Thank in advance Hi all, I am in the process of developing a calculator for some of my colleagues to use. One of the variables within the calculations is called PMH. I want to determine the value of PMH based on which checkboxes are ticked. Each checkbox has a different value. If the checkbox is not ticked, then the value of each option is 1 and obviously more than one checkbox may be ticked. I have created the checbox code: Code: <td><input type="checkbox" name="PMH" value="1.6" /> Smoker<br />
<input type="checkbox" name="PMH" value="0.4" /> CCF<br />
<input type="checkbox" name="PMH" value="0.5" /> Pulmonary Oedema / Cirrhosis<br />
<input type="checkbox" name="PMH" value="0.8" /> COAD<br /></td>
but I have no idea on how to calculate what I need for var PMH. Can someone guide me as to what I need to do please? Cheers, mads I keep getting 28 when I am suppose to get 22 because of Order of Operations. Code: <html>
<head>
<title>Movie</title>
<script type="text/javascript">
function ticketOrder()
{
var cost;
var ticket;
if(document.movieTicket.radTicket[0].checked)
{
ticket=document.movieTicket.radTicket[0].value;
ticket=parseInt(ticket);
cost=cost*ticket;
}
if(document.movieTicket.radTicket[1].checked)
{
ticket=document.movieTicket.radTicket[1].value;
ticket=parseInt(ticket);
cost=cost*ticket;
}
if(document.movieTicket.radReward[0].checked)
{
cost=document.movieTicket.radReward[0].value;
cost=parseInt(cost);
}
else if(document.movieTicket.radReward[1].checked)
{
cost=document.movieTicket.radReward[1].value;
cost=parseInt(cost);
}
if(document.movieTicket.chkPopcorn.checked)
{
var popcorn=document.movieTicket.chkPopcorn.value;
popcorn=parseInt(popcorn);
cost=cost+popcorn;
}
if(document.movieTicket.chkSoda.checked)
{
var soda=document.movieTicket.chkSoda.value;
soda=parseInt(soda);
cost=cost+soda;
}
if(document.movieTicket.chkCandy.checked)
{
var candy=document.movieTicket.chkCandy.value;
candy=parseInt(candy);
cost=cost+candy;
}
alert(cost*ticket);
}
</script>
</head>
<body>
<div id="Header">
<h2>The Chicago Movie Palace</h2>
</div>
<form name="movieTicket">
How many tickets would you like to order?<br />
1 Ticket<input type="radio" name="radTicket" value="1" /><br />
2 Tickets<input type="radio" name="radTicket" value="2" /><br />
3 Tickets<input type="radio" name="radTicket" value="3" /><br />
4 Tickets<input type="radio" name="radTicket" value="4" /><br />
5 Tickets<input type="radio" name="radTicket" value="5" /><br />
Are you a member of our theater?<br />
Yes<input type="radio" name="radReward" value="8" /><br />
No<input type="radio" name="radReward" value="10" /><br />
Would you like any food or drinks with your movie?<br />
Popcorn ($4)<input type="checkbox" name="chkPopcorn" value="4" /><br />
Soda ($3)<input type="checkbox" name="chkSoda" value="3" /><br />
Candy ($3)<input type="checkbox" name="chkCandy" value="3" /><br />
Which movie would you like to see?
<select name="selUpcomingMovie">
<option value="Immortals">Immortals</option>
<option value="J Edgar">J Edgar</option>
<option value="Sherlock Holmes:A Game of Shadows" >Sherlock Holmes:A Game of Shadows</option>
</select>
<p><input type="button" name="btnSubmit" value="Order Tickets" onclick="ticketOrder()" /></p>
</form>
</body>
</html>
Need a little help with the final code on my project. I'm multiplying 3 drop downs to give me a total sq ft. I then want to take that variable and multiply it by a fixed number. i.e. qty*width*length equals a total of 8 sq ft, then take that 8 and multiply it by a fixed number (8*1.75), I want it to calculate without any submit buttons and show the total sq ft and the final value. thanks in advance for any assistance. Code: <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=unicode">
<form>
<meta content="MSHTML 6.00.2900.5921" name="GENERATOR"></head>
<body><strong>Quantity:</strong> <select id="qty" onchange="Calculate();" size="1"
name=qty><option value="1" selected>1</option> <option value="2">2</option>
<option value="3">3</option> <option value="4">4</option> <option
value=5>5</option> <option value="6">6</option> <option value="7">7</option>
<option value="8">8</option> <option value="9">9</option> <option
value=10>10</option> <\SELECT></select> <strong>Banner
Width:</strong> <select id="height" onchange="Calculate();" size="1"
name=height><option value="2" selected>2</option> <option value="3">3</option>
<option value="4">4</option>
<\SELECT></select> <strong>Banner Length:</strong>
<select id="length" onchange="Calculate();" size="1" name="length"><option value="4"
selected>4</option> <option value="5">5</option> <option value="6">6</option>
<option value="7">7</option> <option value="8">8</option>
<\SELECT></select> <strong>Total sq ft: <font
size=4><label id="lblRes"><!-- a Label to locate result in it -->8
</label></form></font></span></span></font>
<p></p></span></span></font></font></strong>
<div></div>
<script language="javascript">
function Calculate()
{
var h = document.getElementById('height').value;
var l = document.getElementById('length').value;
var q = document.getElementById('qty').value;
var result = h * l * q;
document.getElementById('lblRes').innerHTML = result;
}
</script>
</font></strong></body></html>
I'm still a beginner in js core so please forgive if the question is too fundamental. In the following example PositionedRectangle is a subclass of Rectangle, all 3 methods of prototype inheritance seem to produce the same results, method 1 is from the authors book (Flanagan's Definitive Guide 5ed) example 9-3, and method 2 is from his website example 9-3, and method 3 is my own; Code:
// method 1 seems most complicated
function heir(p) {
function f(){};
f.prototype =p;
return new f();
}
PositionedRectangle.prototype = heir(Rectangle.prototype);
//method 2
PositionedRectangle.prototype = new Rectangle();
//method 3 seems most straight forward (I don't know if it's correct but works ok)
PositionedRectangle.prototype = Rectangle.prototype;
Thank you Gents, J. I want to have another go at Javascript. I have several books on the subject but I find that my eyesight is a major problem. Therefore I want to try an on-line solution, preferably free. I have Googled, but there are so many that I am almost dizzy with the choices. Perhaps someone could recommend one. Not too fussy visually. My knowledge is VERY basic. Frank Hello! I am trying to find a script that allows you to open multiple browser tabs and then close each of those tabs, either one by one or all at once. Does anyone know how to do this please? Thanks so much for your help. Does anyone know how to make URL links that use Javascript still work when users have Javascript disabled on their browser? The only reason I'm using JS on a URL is because my link opens a PDF file, and I'm forcing it not to cache so users have the latest version. I tried the <script><noscript> tags, but I'm not sure if I'm using it correctly, as my URL completely disappears. Below is my HTML/Javascript code: <p class="download"> <script type="text/javascript">document.write("<span style=\"text-decoration: underline;\"><a href=\"javascript:void(0);\" onclick=\"window.open( 'http://www.webchild.com.au/mediakit/Direct_Media_Kit_Web.pdf?nocache='+ Math.floor( Math.random()*11 ) );\" >The Child Magazines Media Kit</a></span> (PDF 1 MB) ");</script> <noscript><span style="text-decoration: underline;"><a href="http://www.webchild.com.au/mediakit/Direct_Media_Kit_Web.pdf" >The Child Magazines Media Kit</a></span> (PDF 1 MB)</noscript> </p> Thanks for any help, Michael Hi, I have the following code snippet: test.html ====== <script language="javascript" type="text/javascript"> var testVariable = "test"; </script> <script language="javascript" type="text/javascript" src="test.js"> </script> test.js ===== var testVariable = window.top.testVariable; In firefox, I'm able to access testvariable defined within test.html in test.js. But in chrome, test.js couldnot get the window.top.testVariable field defined in test.html. Can any one please let me know how i can make it work in chrome?. Am i missing something here?. Hi Guys, I am new at JavaScript and start to do some tutorials.What I am trying to do here is prompting user to input a name and if the name was valid the page(document) will display with all objects like the button.But if user enter a wrong name then the button will be disabled! I create the following code but it did not work <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>New Web Project</title> <script language="JavaScript" type=""> function changeColor(){ document.bgColor = "Gray"; } </script> </head> <body> <script language="JavaScript" type="text/javascript"> var person = ""; person = prompt('What is Your Name:'); if (person == "Foo") { document.write("<h1 />Welcome " + person); document.bgColor = "Yellow"; } else { document.write("<h1 />Access Denied!!!!"); document.bgColor = "Red"; document.getElementById("gree").disabled = true; } </script> <div> <p/><input id="gree" type="button" value="Gray " onClick="changeColor();"> </div> </body> </html> as you can see I used the: document.getElementById("gree").disabled = true; but it did not work , could you please give an idea how I can solve this problem? Thanks I want to insert this js snippet Code: function addText(smiley) {
document.getElementById('message').value += " " + smiley + " ";
document.getElementById('message').focus();
return false;
}
to a loaded iframe with name&id chtifrm. I can access it & change embed something in its html via using something like: Code: $(parent.chtifrm.document.body).append('<div id=\"smly\" style=\"cursor:pointer;float:left;top:200px;display:none;position:absolute;\"><\/div>');
.... Code: parent.chtifrm.document.getElementById('chatbox_option_disco').style.display == 'none'
but how do I insert js in the head of loaded iframe? I got an index.php Code:
<html>
<form action="bacakomik.php" method='post'>
<select name="kodekomik">
<option value='../komik1/|23'>Judul Komik1</option>
<option value="../komik2/|20">Judul Komik2</option>
<option value="../komik3/|10">Juduk Komik3</option>
<option value="../komik4/|20">Judul Komik4</option>
</select>
<input type="submit" />
</form>
<?php
echo ('<select>');
echo ('<option value= "'.$i.'">'.'Page '.$i.'</option>');
echo ('</select>');
?>
</html>
As you can see, each of the option brings specific value "../komik1/|23" komik1 is a directory | is a delimiter 23 is the pages in one chapter and can be considered also as how many images are there on a specific directory This is my bacakomik.php Code: <?php
$dirkomik = $_POST['kodekomik'];
$exploded = explode("|", $dirkomik);
echo ($exploded[0]); //picture directory
echo ("<br>");
echo ($exploded[1]); //total page in the comic
$pagecount = (int)$exploded[1];
//Take last posted value, process it right away
echo ('<FORM name="guideform"> ');
echo ('<select name="guidelinks">');
$i=1;
do {
echo ('<option value= "'.$i.'">'.'Page '.$i.'</option>');
$i= $i+1;
}while($i <= $pagecount); //Printing option and select
echo ("</select>");
?>
<input type="button" name="go" value="Go!" onClick="document.getElementById('im').src=document.guideform.guidelinks.options[document.guideform.guidelinks.selectedIndex].value+'.png';"> </FORM>
<img src="img0.jpg" id="im">
With the current code on bacakomik.php, I only can change the img src of id "im" in the same directory only. What I want is that the Javascript could "add" the "$exploded[0]" variable so that the picture can be loaded from different directory. Anyone can do this? I believe that the fix should be somewhere on input tag inside OnClick, or do you know where? Anyway, I found this on the net http://p2p.wrox.com/php-faqs/11606-q...avascript.html Please help me to those who can... Hey, I've got to make the values of some textboxes change the co-ordinates of my sprite on a canvas and havent a clue on how to do it, Here is my form with the two textboxes and submit button: <form> x: <input type="text" name="x" /><br /> y: <input type="text" name:"y" /><br /> <input type="submit" value="Submit"/><br /> </form> And i need it so that they change the values of these: //this shows where my sprite will start on the canvas var block_x; var block_y; searched the internet for hours and cant really find anything i understand or works. any help is much appreciated Hi Guys I am trying to modify the functionality of my page. I want to be able to activate this piece of code using another javascript function. This is the code I want to activate: Code: <script type="text/javascript"><!--
$('#button-cart').bind('click', function() {
$.ajax({
url: 'index.php?route=checkout/cart/update',
type: 'post',
data: $('.product-info input[type=\'text\'], .product-info input[type=\'hidden\'], .product-info input[type=\'radio\']:checked, .product-info input[type=\'checkbox\']:checked, .product-info select, .product-info textarea, .date_data input[type=\'text\']'),
dataType: 'json',
success: function(json) {
$('.success, .warning, .attention, information, .error').remove();
if (json['error']) {
if (json['error']['warning']) {
$('#notification').html('<div class="warning" style="display: none;">' + json['error']['warning'] + '<img src="catalog/view/theme/default/image/close.png" alt="" class="close" /></div>');
$('.warning').fadeIn('slow');
}
for (i in json['error']) {
$('#option-' + i).after('<span class="error">' + json['error'][i] + '</span>');
}
}
if (json['success']) {
$('#notification').html('<div class="success" style="display: none;">' + json['success'] + '<img src="catalog/view/theme/default/image/close.png" alt="" class="close" /></div>');
$('.success').fadeIn('slow');
$('#cart_total').html(json['total']);
$('html, body').animate({ scrollTop: 0 }, 'slow');
}
}
});
});
//--></script>
And this is how I want the format of the function to be: function testsession() { if there is a session called 'hiredate' { activate the script above } else { var el = document.getElementById("product_data"); } } I just dont know how to write this in javascript Could you help me if possible please All -- I have a JavaScript config file called gameSetting.js which contains a bunch of variables which configures a particular game. I also have a shared JavaScript library which uses the variables in gameSetting.js, which I include like so: <script type="text/javascript" src="gameSetting.js" ></script> <script type="text/javascript" src="gameLibrary.js" ></script> In gameSetting.js I have: $(document).ready(function() { // call some functions / classes in gameLibrary.js } in Firefox, Safari, and Chrome, this works fine. However, in IE, when it's parsing gameSetting.js, it complains that the functions that live in gameLibrary.js aren't defined. When it gets to parsing gameLibrary.js, the variables in gameSetting.js are reported as not being defined. I've tried dynamically bootstrapping the gameLibrary file using this function in document.ready for dynamic load... $.getScript("gameLibrary.js"); However, the same problem still happens in IE, where when it parses the files individually it's not taking into context the file/variables that came before, so it's not an out of load order problem. My options a 1) collapsing all the functions in gameLibrary.js and variables in gameSetting.js into one file. However, this is not practical because this is dealing with literally hundreds of games, and having a gameLibrary.js in ONE location for ONE update is what makes most logical sense. 2) figure out a way to get this to work where variables in file1 are accessible to file2 in IE (as it seems they are in other browsers). jQuery seems to be able to have multiple plugins that all refer to the based jQuery-1.3.2.js, so I know there is a way to get this to work. Help appreciated. Nero I wrote a log function that took note of various function calls. Thinking that functions are first class objects, and objects have properties, I made the name of each logged function a property of that function, e.g., brightenInnerPara.name = "brightenInnerPara"; Every browser I tried (Firefox, MSIE, Opera, Chrome, Safari) accepted the assignment, no problem. In Firefox and MSIE, the result was what I wanted: brightenInnerPara.name == "brightenInnerPara" But in the others, the result was: brightenInnerPara.name == null Question 1. Which Javascript is correct here? I favor Firefox and MSIE, not merely because they were willing to give me what I wanted, but also because it makes no sense to accept an assignment statement without throwing an error and then give it a null semantics, like Chrome, Opera, and Safari did. I found a workaround, using assignments like this: brightenInnerPara.prototype.name = "brightenInnerPara"; To my surprise, that worked in every browser. But I don't know why. It seems that such assignments are enough to cause each function to have its own distinct prototype. Question 2. Just how inefficient is my workaround, and why does it work? am using google.load("jquery", "1.6.2"); in my grower.js file. The following error is showing in IE8 'google is undefined' but its working fine in FF. please any one help me to how to overcome this error.
I'm very very new to coding. I need to make a very basic javascript game for school. I'm trying to modify this ball bouncing game, but the ball doesn't collide with the paddle. Where have I gone wrong? <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>HoffHop!</title> <style> #playingArea{ position: absolute; top: 100; left: 100; border: 2px solid black; width: 500; height: 500; background-color: rgb(192,192,192); } #paddle{ position: absolute; top: 470; left: 228; width: 64; height: 16; } #ball{ position: absolute; top: 18; left: 200; width: 34; height: 34; } #score{ position: absolute; top: 486; left: 0; width: 500; height: 14; font-size: 10pt; color: white; background-color: rgb(32,128,64); } </style> <script language="JavaScript"> //get info, process data, update screen objects //instance vars var ball; var paddle; var score; //initial speeds var dx = 5; var dy = 5; var currentScore = 0; var timer; //set initial conditions for ball and paddle var paddleLeft = 228; var ballLeft = 300; var ballTop = 4; function init(){ //instantiate HTML object instance vars ball = document.getElementById('ball'); paddle = document.getElementById('paddle'); score = document.getElementById('score'); //register key listener with document object document.onkeydown = keyListener; //start the game loop start(); } function keyListener(e){ if(!e){ //for IE e = window.event; } if(e.keyCode==37 && paddleLeft > 0){ //keyCode 37 is left arrow paddleLeft -= 4; paddle.style.left = paddleLeft + 'px'; } if(e.keyCode==39 && paddleLeft < 436){ //keyCode 39 is right arrow paddleLeft += 4; paddle.style.left = paddleLeft + 'px'; } } function start(){ //game loop detectCollisions(); render(); difficulty(); //end conditions if(ballTop < 470){ //still in play - keep the loop going timer = setTimeout('start()',50); } else{ gameOver(); } } function detectCollisions(){ //just reflect the ball on a collision //a more robust engine could change trajectory of ball based //on where the ball hits the paddle if(collisionX()) dx = dx * -1; if(collisionY()) dy = dy * -1; } function collisionX(){ //check left and right boundaries if(ballLeft < 4 || ballLeft > 462) return true; return false; } function collisionY(){ //check if at top of playing area if(ballTop < 4) return true; //check to see if ball collided with paddle if(ballTop > 470){ if(ballLeft > paddleLeft && ballLeft < paddleLeft + 64) return true; } return false; } function render(){ moveBall(); updateScore(); } function moveBall(){ ballLeft += dx; ballTop += dy; ball.style.left = ballLeft; ball.style.top = ballTop; } function updateScore(){ currentScore += 5; score.innerHTML = 'Sco ' + currentScore; } function difficulty(){ //as the game progresses, increase magnitude of the vertical speed if(currentScore % 1000 == 0){ if(dy > 0) dy += 1; else dy -= 1; } } function gameOver(){ //end the game by clearing the timer, modifying the score label clearTimeout(timer); score.innerHTML += " Game Over"; score.style.backgroundColor = 'rgb(128,0,0)'; } </script> </head> <body onLoad="init()"> <h1>Bask-A-Bounce</h1> <div id="playingArea"> <div id="paddle"> <img src="paddle1.gif"> </div> <div id="ball"> <img src="ball.gif"> </div> <div id="score"> Sco 0 </div> </div> <embed name="Baywatch" src="Baywatch.mp3" loop="false" hidden="true" autostart="true"> </embed> </body> </html> |
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