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JavaScript - Help With Arrays, Objects, And Averages
I am having some issues with my code...
The code is supposed to ask for an average of the values in the numeric property (Cost), which works, but it repeating itself twice. Also, I need to calculate and display the number of elements of (Cost), whose numeric property values is greater than the average. ANY help is highly appreciated ... Thanks! var expense = new Array(); var loop; var property; var numExpense; var LOOP_START = 1; var average = 0; var numberAverage = 0; numExpense=parseInt(prompt("How many expenses?")); for (loop = 0; loop < numExpense; loop++) { expense[loop] = new Object(); } expense[0].Name = prompt("Expense Name?"); expense[0].Cost = parseFloat(prompt("Expense Cost ?")); expense[0].Type = prompt("Expense Type?"); expense[0].Location = prompt("Expense Location?"); for (loop = LOOP_START; loop < numExpense; loop++) { expense[loop].Name = prompt("Expense Name?"); expense[loop].Cost = prompt("Expense Cost?"); expense[loop].Type = prompt("Expense Type?"); expense[loop].Location = prompt("Expense Location?"); } document.write("<br /> <h2> Expenses </h2>"); for(loop = 0; loop < numExpense; loop ++) { for(property in expense[loop]) { document.write("<br />Expense # " + (loop + 1) + " " + property + " : " + expense[loop][property]); } document.write("<br />"); } for(loop = 0; loop < numExpense; loop ++) { for(property in expense[loop]) { average=expense[loop].Cost/numExpense } document.write("<br />Average Cost: $ " + average); } for(loop = 0; loop < numExpense; loop ++) { for(property in expense[loop]) { parseInt(numberAverage) = numExpense > average } document.write("<br />Number of expenses more than Average: $ " + numberAverage); } Similar TutorialsHey Coding Forum, Hey as you probably know iam new here as i probably haven't even posted this in the correct place but i have a real problem with my JavaScript and i can't get it to do what i would like. I have to write a code to show a new array to represent the third row of a table (var myarray value of which are "60","80","187","180","114" , and creating an array of the required length. Which i have done. (i Think ) I now need to write the remainder of the JavaScript needed to calculate the average height of the objects and write it out in the browser window. It need to write average height 17.2 cm. I have included my script below and but i am not understanding how to work out the average, i believe i need to add another 'for loop' but i can't get it to work correctly. (i might be being completely stupid) If anyone would be able to help it would be GREATLY appreciated. Thanks for all help. <HTML> <HEAD> <TITLE> Test Experiment </TITLE> <SCRIPT LANGUAGE = "JavaScript"> var height = [15,16,17,18,19]; var number = [4,5,11,10,6]; var myarray = new Array(5) var myarray = ["60","80","187","180","114"] ; var values = [60, 80, 187, 180, 114]; var total = 0; for ( var i = 0; i < values.length; ++i ) { total += values[i]; } var myarray = total + values.length; document.write('average height of the object is ' +myarray + '<br>'); </SCRIPT> </HEAD> <BODY> </BODY> </HTML> hi. i know a little php, but new to javascript. much of the syntax is identical. i'm reading the new rhino book (flanagan 6th). in it, where he introduces METHODS, he says "When we combine FUNCTIONS with OBJECTS we get METHODS". Then he creates an empty ARRAY: Code: var a = []; then he uses the "push() method" to add elements to the array. Code: a.push(1,2,3); uh, methods are for *objects* right? Yet he is using them on an ARRAY. Can somebody help me see the light on how an array can magically becomes an object that is manipulated by a "method"? I mean, the array is still an array, no? It never actually becomes an object, right? Yet we still use a *method* to manipulate it. See my conceptual quandry? I have my first ever scholastic JS assignment and so far it's felt nearly impossible to get a grip on how to do it. I've gone through the W3c tutorials entirely 3 times now and still, nothing is clicking mentally. Generally I do better if I can reverse engineer already written code but I can't find anything similar enough to this on the net to figure it out. The assignment is to create a grade averages calculator as seen in this pictu Along with this starter code: 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>Assignments score calculator</title>
<style type="text/css">
<!--
.score {
width: 30px;
}
-->
</style>
</head>
<body>
<h1>Assignments score calculator</h1>
<form id="calculator" name="calculator" method="post" action="">
<p>Enter your Name:
<label for="firstname"></label>
<br />
<input type="text" name="firstname" id="firstname" />
<p>
<label for="A1">Assignment #1 sco </label>
<input name="A1" type="text" class="score" id="A1" maxlength="3" /><br />
<label for="A2">Assignment #2 sco </label>
<input name="A2" type="text" class="score" id="A2" maxlength="3" /><br />
<label for="A3">Assignment #3 sco </label>
<input name="A3" type="text" class="score" id="A3" maxlength="3" />
<p>
<label for="button"></label>
<input type="submit" name="Submit" id="Submit" value="Submit" xx="doCalculation(this.form.firstname.value,this.form.A1.value,this.form.A2.value,this.form.A3.value)" />
</form>
</body>
</html>
I understand what I need to do, just not the syntax to do it. Any help would be appreciated. Sorry for newbiness. I need to loop the alphabet and numbers 0-9 to initialize a few thousand arrays. This is for my site and is truly needed. http://www.thefreemenu.com I currently have every array written out and it takes up to much space in my .js file. The majority of my variables are empty but necessary and need to be there (including empty) for my site to work properly. Question is the last part Here's where I'm at. Code: var NewVarLetterOrNum = "a";
eval("_oneofseveralnames_" + NewVarLetterOrNum + "='this part works';");
alert(_oneofseveralnames_a);
This creates the variable _oneofseveralnames_a='this part works' Code: var newArrayLetterOrNum = "a";
eval("_oneofseveralnames_" + newArrayLetterOrNum + "= new Array();");
alert(_oneofseveralnames_a)
This creates the Array _oneofseveralnames_a=new Array(); and all the values in the array are null, but, now a variable like _nl_a[1]='something' can be used elsewhere because the array exists. This is all that is necessary for now because I can probably set all the variables to be blank with something like Code: i=1
while(i<=20){
_oneofseveralnames_a[i]="1-20";
i++
}
alert(_oneofseveralnames_[20]);
So now you have what I came to understand in the first few hours. Now to the hard part : ( I can't make multiple array's dynamically. I dont' know if its because I don't understand loops or arrays or what and its very fustrating. As for any answer you might be so kind as to provide, if you could dumb it down that would be greatly appreciated. Code: var newArray =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')
i=1
while(i<=26){
eval("_nl_" + newArray[i] + "= new Array();");
i++
}
alert(newArray[1]) // Is b, but
alert(_nl_b) //I can't get _nl_b to exist, I tried everything including taking away the quotes around the letters in every test
*/
var _nl_a =new Array()
var _img_a =new Array()
var _h_a =new Array()
var _r_a =new Array()
var _m_a =new Array()
var _yt_a =new Array()
var _i_a =new Array()
The above arrays are all the array _name_ parts I need but for example, a has 10 parts, a,p2_a,p3_a,.. p10_a. I need 10 pages for each letter of the alphabet and numbers 0-9 and a special all1, p2_all1 ... p10_all1. Overall 2200 arrays that need to be declared. Currently they are all written out.
/*
function($) { $.fn.superfish = function(op){ var sf = $.fn.superfish, c = sf.c, } So I see the '.superfish' method being added to the object '$.fn'. I find it interesting that the first order of business is to declare 'sf' and stuff in to it some value '$.fn.superfish' which I do not fully understand. Also the statement c=sf.c How can 'c' be set to equal 'sf.c' when no 'sf.c' has been declared yet? Thanks! Greetings! This is actually a two part question from the html source I attached as a .txt document (too big for the post). 1) How can I get the name of an object. I took my failed attempt in the function named disableJobStream: Code: function disableJobStream(obj)
{
if((obj.value == "completed") && (getRadioCheckedValue("shift") == "2"))
{
if(obj.name == "artprogs")
{ document.shiftreport.artprogs.disabled = true; }
}
<select style="100px;" name="artprog_stat" OnChange="disableJobStream(this)"><option style='background-color:white;' value='none'selected='selected'>None</option>
<option style='background-color:red;' value='stopped'>Stopped</option>
<option style='background-color:yellow;' value='running'>Running</option>
<option style='background-color:green;' value='completed'>Completed</option>
</select>
2) Once I put my form through validation any of the fields that I disabled become enabled again. How would I go about keeping that from happening? Page is too large to post and too large to put up as an attachment! Thanks for your help! Hello there folks, First time poster, so please be gentle I am ok with using objects creating classes if someone else defines, but when it comes to defining my own, I hit a nasty brick wall... I am using an XML/XSLT wrapper called Sarissa to help with programming a utility to transform XML into HTML in different views. For this to happen, I have created a Loader class which loads in XML required. I am aware of prototyping for binding methods to objects (as opposed to replicating the same method every time an instance is created)... The aim being I want to create a progress bar for the essential files that need to be loaded in. Presently I have them load in Synchronous mode just to get the utility working, which I know is poor, so would like to address it. So can someone answer me this: I understand why this works: Code: var SWMU = new Object();
SWMU.stylesheets = new Object;
SWMU.joblot = null;
SWMU.cache = new Object;
SWMU.filtering = new Object;
SWMU.locns = null;
function Loader(sXml, sTitle) {
this.doc = Sarissa.getDomDocument();
this.doc.load(sXml);
this.doc.summary = sTitle;
this.doc.onreadystatechange = function() {if(this.readyState)
{alert(this.summary + " state change to..." + this.readyState);} else
{alert(this.summary + " state change to..." + this.doc.readyState);}
}
}
function async() {
SWMU.stylesheets[0] = new Loader("swmu_test/swmu_berthing.xsl", "Main SWMU Stylesheet");
SWMU.stylesheets[1] = new Loader("assets/xsl/controls.xsl", "Drop down boxes");
}
function _init() {
async();
}
as it recreates the "this.doc.onreadystatechange" anonymous function everytime an instance is created (which is yuck). However, when I do this (using prototype)... Code: var SWMU = new Object();
SWMU.stylesheets = new Array;
SWMU.joblot = null;
SWMU.cache = new Object;
SWMU.filtering = new Object;
// Now define the Loader object
// Create the loader method for dealing with items loaded
function Loader(sXml, sTitle) {
this.doc = Sarissa.getDomDocument();
this.doc.load(sXml);
this.doc.summary = sTitle;
}
function rHandler() {alert(this.summary + " State changed to... "+this.readyState);}
// Create the request handler
Loader.prototype.doc = {};
Loader.prototype.doc.onreadystatechange = rHandler;
function async() {
SWMU.stylesheets[0] = new Loader("swmu_test/swmu_berthing.xsl", "Main SWMU Stylesheet");
SWMU.stylesheets[1] = new Loader("assets/xsl/controls.xsl", "Drop down boxes");
}
function _init() {
async();
}
Nothing happens and no errors are thrown, though there should be an alert box everytime there is state change to the progress of a file loading. Can someone help me with this? Apologies if this is on the basic side, but it has been causing me a headache all week, and I can not find any answers on this. Shaun I'm having a spot of trouble in making my functions work and my book seems to be pure rubbish. I'm sure that the error is purely syntax, although it may be something more. Code: <script type="text/javascript" src="flowers.js"></script>
<script type="text/javascript">
function pageSetup() {
var today = new Date(); // this creates a date object with today's date
var banner = displayBanner(today); // *should* call the displayBanner function
var days = calcDaysToSale(today); // *should* call the function using today's date
document.sale.saleMessage.value = days; // *should* set the value to days.
// Obviously none of it works.
}
</script>
This is the code working with the script contained in the html file. I'll post the full page at the bottom. The following code is the JavaScript code. The first function isn't made to provide full functionality at the moment, I'm trying to get the rest of it working. Code: function displayBanner(currentDate) {
if (currentDate.getMonth() == 2)
imgSrc = "winterLogo";
return ("<img src='" + imgSrc + ".gif'>");
}
function calcDaysToSale(currentDate) {
var saleDay = new Date();
saleDay.setDate(15); // sets the sale date to the 15th of the current month
// Subtracts the days remaining until the sale.
// If the number is negative, the sale is over.
var Days = saleDay.getDate()-currentDate.getDate();
if (Days < 0) {
return "The sale has ended.";
}
else {
return Days;
}
}
I have tried to Google the problem and I have also tried to look it up in my book. I simply don't know the right terms to Google, and as I said the book is rubbish. I don't know why the Code: document.sale.saleMessage.value = days; doesn't work for this. Oh well, I'll learn quickly I suppose. Here is the full HTML code: 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>Carol's Flowers</title>
<link href="flowers.css" rel="stylesheet" type="text/css" />
<script type="text/javascript" src="flowers.js"></script>
<script type="text/javascript">
function pageSetup() {
var today = new Date(); // this creates a date object with today's date
var banner = displayBanner(today); // *should* call the displayBanner function
var days = calcDaysToSale(today); // *should* call the function using today's date
document.sale.saleMessage.value = days; // *should* set the value to days.
// Obviously none of it works.
}
</script>
</head>
<body class="oneColLiqCtrHdr">
<div id="container">
<div id="header">
<p><img name="myBanner" src="banner" id="myBanner" alt="Carol's Flowers" />
<!-- end #header -->
</p>
<div id="links"><a href="#">Home</a> | <a href="#">General Arrangements</a> | <a href="#">Seasonal Designs</a> | <a href="#">Custom Orders</a> | <a href="#">Location</a></div>
</div>
<div id="mainContent">
<table id="mainTable">
<tr>
<td width="201"><h1><img src="Flowers.JPG" alt="Random Flowers" width="200" height="255" /></h1></td>
<td width="687">
<p>Here at Carol's Flowers, we believe that there is a perfect floral arrangment for every occasion! Take a look around and see if there is anything you like. If we don't already have it, then we will create it for you!</p></td>
</script>
</tr>
</table>
<!-- end #mainContent --></div>
<div id="footer">
<p> <form name="sale" id="sale">
Days Until Mid Month Madness Sale :
<input type="text" name="saleMessage" id="saleMessage" /></form></p>
<!-- end #footer --></div>
<!-- end #container --></div>
<!-- I am trying to run the script here -->
<script type="text/javascript">
pageSetup();
</script>
</body>
</html>
I'm trying to reuse some code in a different context to do a different job. The code to be reused contains hundreds of lines similar to a = new b.c.d(e,f) with different value for e and f. I need to create a new user defined object with the structure b.c.d. I've made numerous attempts along the lines of: Code: function d (e, f) {
this.e = e;
this.f = f;
}
function c () {
this.d = d (e, f);
}
function b () {
this.c = c;
}
var a = new b.c.d("test", "message");
with various permuations of functional declarations. However I get error message "Object expected" or "b.c.d is null or not an object" at the final line of the example. It works with the test line var a = new d("test", "message") but not when I start to build up the expression. How should I define of b.c.d? Hi If i was using c# i would use a generic list and add all my people objects to the list collection but how do i do this in jquery/javascript eg //container object var allObj= { }; //people object var people= { name:"fred",: age:00; }; How do I add many people objects to allObj (the amount of people added in not always the same) eg the final result is something like this allObj -person1 -person2 -person3 -person4 thanks Hello everybody am a JavaScript beginner. here is a code making rollovers //////////////////////////////////////////////// window.onload=rolloverInit; function rolloverInit() { for(var i=0; i<document.images.length; i++) { if(document.images.parentNode.tagName=="A") { setUpRollover(document.images); } } } function setUpRollover(currentImage) { currentImage.outImage = new Image(); currentImage.outImage.src = currentImage.src; currentImage.onmouseout = rollOut; currentImage.overImage = new Image(); var source = currentImage.src; var sourceText = source.toString(); if(sourceText.indexOf("png")>0) { currentImage.overImage.src ="images/"+currentImage.id+"_on.png"; } else { currentImage.overImage.src ="images/"+currentImage.id+"_on.gif"; } /*currentImage.overImage.src ="images/"+currentImage.id+"_on.gif";*/ /*currentImage.overImage.src ="images/"+currentImage.id+"_on.png";*/ currentImage.onmouseover = rollOver; currentImage.clickImage = new Image(); if(sourceText.indexOf("png")>0) { currentImage.clickImage.src ="images/"+currentImage.id+"_click.png"; } else { currentImage.clickImage.src ="images/"+currentImage.id+"_on.gif"; } /*currentImage.clickImage.src = "images/"+currentImage.id+"_on.gif";*/ /*currentImage.clickImage.src = "images/"+currentImage.id+"_on.png";*/ currentImage.onmousedown = rollClick; currentImage.parentNode.childImage = currentImage; currentImage.parentNode.onblur = rollOutParent; currentImage.parentNode.onfocus = rollOverParent; } function rollOut() { this.src = this.outImage.src; } function rollOver() { this.src = this.overImage.src; } function rollClick() { this.src = this.clickImage.src; } function rollOutParent() { this.childImage.src = this.childImage.outImage.src; } function rollOverParent() { this.childImage.src = this.childImage.overImage.src; } //////////////////////////////////////////////// 1-I do understand "if iam right, lol" that here ///currentImage.outImage = new Image();/// and here ///currentImage.overImage = new Image();/// and here ///currentImage.clickImage = new Image();/// we are creating an image object "overImage" on the fly which still a property of currentImage object, to keep track and store the current image and new image src. but here ///currentImage.parentNode.childImage = currentImage;/// I am unable to see the point behind creating the childImage object -same rule applied here??? is it really a brand new independent object "still a property of the parent" created on the fly like before? and if so -what is is purpose here?? how the cildImage object is interacting here, what is its purpose? and how it is able to modify "actually change" the <a> object child node Image object "currentImage". it seems stupid question but its quiet simple ---///currentImage.parentNode.childImage = currentImage;/// here I have an object on the fly, a new Image object "childImage", that is Fine until now. ---///this.childImage.src = this.childImage.outImage.src;/// now how the childImage became able to change my parent "<A>" child "currentImage" src ??? how it "childImage" became displayable at all is is because of the assignment here ///currentImage.parentNode.childImage = currentImage;/// ??? Yes i assigned currentImage to the childImage, but based on my java programing concepts background each still independent objects refrences representing two different objects ---->and so based on that here is these functions rollOutParent(), rollOverParent() am supposed to say something like ***this.currentImage.src = this.childImage.src*** or ***this.childImage.src = this.childImage.outImage.src;***or whatever "i know thats wrong coding here am just giving example". ------------ am confused, how with this simple line of code currentImage.parentNode.childImage = currentImage; childImage became able to define the currentImage ? and if so, how this was achieved, hoe the Objects is being represented and how they interact in the core memory? Is it possible to create an array of objects? I require a two dimensional array of objects. Thanks! Hi there, I have a very strange issue using dynamic scripting and iframe. It looks like when when iframe is loaded (i.e. onload method is triggered) all js objects that were sent to iframe before disappear? To clarify... I set iframe.scr from java script that caused it to connect to the server. After connection is established I start sending JS code to it (including some JS objects). At some point connection to iframe is closed (and onload method is called). Later on I reconnect (i.e. set src property again), and try to issue method calls on the JS objects that were sent in earlier session. None of these methods get triggered. Did anyone experienced similar problems? Is there a workaround? (I.e. is there any way I can send register JS Objects globally when sent through iframe?). Thanks for all your help, Ed Hi, I am trying to detect a users browsers and output a different code based on browser. I found this code online that uses the object detection method and it works. When I document.write(BrowserDetect.browser) it outputs Chrome, (which is what I am using). The code can be found he http://www.quirksmode.org/js/detect.html So I can't understand why the following code does not work? It ouputs the "not" in the else statement. I believe that BrowserDetect is an object and the .browser at the end is a property of the object. Can one not make an object a variable? or make an object a string? oh and BTW there is a bunch of javascript that creates the browserdetect object that can be found on the site above, but I thought it would be too unwieldy to post here. Thanks. The following script outputs: Chrome Not Working <script type="text/javascript"> document.write(BrowserDetect.browser); var browser="BrowserDetect.browser"; if(browser=="Chrome") { document.write(" Working"); } else { document.write(" Not working"); } </script> I am able to do the following; Code: alert(myObject.Income.EESA.Name); However I'm looking at Code: alert(myObject.Income[0].Name); Or even better, not the full name, just "EESA". I need to loop through as you can see at the end of this script what I'm working on. Code: <script type="text/javascript">
var EESARate = 289.3;
var DLARate = 111.20;
var CARate = 61.35;
var SkyCost = 54.75;
var PerfectHomeCost = 28.17;
var CreditExpertCost = 14.99;
var UnitedUtilitiesCost = 8.13;
var BTCost = 57.18;
var AdobeCCCost = 46.88;
var TVLicenceCost = 6.06;
var GasCost = 10.00;
var ElectricCost = 20.0;
var ServerPackageCost = 9.99;
var USDValue = 123; //Fetch the value
var myObject = {
"Income": {
"EESA": {
"Name": "Enhanced Employment and Support Allowance",
"Amount": {
"GBP": EESARate,
"USD": EESARate * USDValue
},
"Frequency": {
"When": "14",
"Next": "30/10/2014"
},
"Description": "",
},
"DLA": {
"Name": "Disibility Living Allowance",
"Amount": {
"GBP": DLARate,
"USD": DLARate * USDValue
},
"Frequency": {
"When": "7",
"Next": "Wednesday"
},
"Description": "",
},
"CA": {
"Name": "Carers Allowance",
"Amount": {
"GBP": CARate,
"USD": CARate * USDValue
},
"Frequency": {
"When": "7",
"Next": "Saturday"
},
"Description": "",
},
},
"Bills": {
"Sky": {
"Name": "Sky",
"Amount": {
"GBP": SkyCost,
"USD": SkyCost * USDValue
},
"Frequency": {
"When": "30",
"Next": "XX/XX/XX"
},
"Description": "",
},
"PerfectHome": {
"Name": "Sky",
"Amount": {
"GBP": PerfectHomeCost,
"USD": PerfectHomeCost * USDValue
},
"Frequency": {
"When": "7",
"Next": "Wednesday"
},
"Description": "",
},
"CreditExpert": {
"Name": "Experian Credit Expert",
"Amount": {
"GBP": CreditExpertCost,
"USD": CreditExpertCost * USDValue
},
"Frequency": {
"When": "30",
"Next": "XX/XX/XX"
},
"Description": "",
},
"UnitedUtilities": {
"Name": "United utilities",
"Amount": {
"GBP": UnitedUtilitiesCost,
"USD": UnitedUtilitiesCost * USDValue
},
"Frequency": {
"When": "7",
"Next": "Wednesday"
},
"Description": "",
},
"BT": {
"Name": "British Telecomunications",
"Amount": {
"GBP": BTCost,
"USD": BTCost * USDValue
},
"Frequency": {
"When": "30",
"Next": "XX/XX/XX"
},
"Description": "",
},
"AdobeCC": {
"Name": "Adobe Creative Cloud Suite",
"Amount": {
"GBP": AdobeCCCost,
"USD": AdobeCCCost * USDValue
},
"Frequency": {
"When": "30",
"Next": "XX/XX/XX"
},
"Description": "",
},
"TVLicence": {
"Name": "Television Licence",
"Amount": {
"GBP": TVLicenceCost,
"USD": TVLicenceCost * USDValue
},
"Frequency": {
"When": "30",
"Next": "XX/XX/XX"
},
"Description": "",
},
"Gas": {
"Name": "Eon Gas",
"Amount": {
"GBP": GasCost,
"USD": GasCost * USDValue
},
"Frequency": {
"When": "7",
"Next": "Wednesday"
},
"Description": "",
},
"Electric": {
"Name": "Eon Electric",
"Amount": {
"GBP": ElectricCost,
"USD": ElectricCost * USDValue
},
"Frequency": {
"When": "7",
"Next": "Wednesday"
},
"Description": "",
},
"ServerPackage": {
"Name": "1&1 Unlimited Plus (12 mo. term)",
"Amount": {
"GBP": ServerPackageCost,
"USD": ServerPackageCost * USDValue
},
"Frequency": {
"When": "30",
"Next": "XX/XX/XX"
},
"Description": "",
},
},
};
var IncomeTotal = 0;
for (var k in myObject.Income) {
if (myObject.Income.hasOwnProperty(k)) {
++IncomeTotal;
}
}
alert(myObject.Income.EESA.Name);
document.write('<table>')
for(i = 0; i < IncomeTotal; i++){
document.write('<tr>')
document.write('<td>row ' + (i+1) + ', column 0</td>')
document.write('</tr>')
}
document.write('</table>')
var TotalBills = 0;
for (var k in myObject.Bills) {
if (myObject.Bills.hasOwnProperty(k)) {
++TotalBills;
}
}
//alert(TotalBills);
</script>
Good day, I have the following code: Code: var img = new Image(); img.myProperty = 'something'; I've tried Image.prototype.myProperty and a few other things. It seems IE just doesn't want me extending the Image object. Is there a known work-around? Thanks Hi All I thought it was about time to actually learn Javascript rather than pretend I know it, so I'm new to Javascript. I've been reading Javascript 'The Good Parts' and have watched a few google videos on Youtube. So I came across prototyping which seems to be quite fundamental to JS but is quite awkward to use. I am trying to avoid the use of the 'new' keyword and limit my application to one Global variable, as this can improve the JS scripts performance, reliability and security. In essence I'm just trying to make a simple MsgBox object that has a method called 'alertMe', which in turn simply shows an alert box with 'Hello' If this is not very clear then say so as trying to explain something you don't fully understand is quite hard. Here's my code, doesn't alert when I called the object. Have a look Code: var MyLib = {};
MyLib.MsgBox = function(){
//Object methods
MyLib.MsgBox.prototype.alertMe = function(){
alert('Hello');
};
};
MyLib.MsgBox.alertMe();
Any help and pointers will be very appreciated. Regards, Magnetica Hi all, I was under the impression that I and object/associative array could have other objects as the keys for properties. That is, I should be able to set myObject[anotherObject] = 1. However, while this seems to work at first glance, any new object I set as a property key overwrites the first one. Here is the result of me testing in my Chrome console: Code: > var obj1 = new Object();
> var obj1.someProperty = "test"
"test"
> var obj2 = new Object();
> obj2.someOtherProperty = "test2"
"test2"
> obj1 == obj2
false
> obj1 === obj2 // the two objects I created are definitely not the same
false
> x = {}
> x[obj1] = 0 // set the two objs as property keys on x
0
> x[obj2] = 1
1
> x[obj1]
1 // blargh! x.obj2 overwrote x.obj1!
Any idea if this is possible, and if I'm just messing up with something dumb? Hello, I have an Object, containing an object, containing an object....etc. So, it's an Object of objects. Not an Array of objects. And now I want to sort this Object of objects. Is there a "native" way in JavaScript to sort an object? Or do I understand it correctly, that I first have to convert the Object to an Array, and than perform an array.sort ? This question is just for my understanding of JavaScript, so I don't go into the wrong direction. Tnx in advance for any explanation. |
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