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JavaScript - Using Recursion To Print Out Nested Objects
Hi,
I am having trouble with a recursive function I created to list out the indexes and values of various nested objects. Code: var macros={
CTRL: {
ALT: {
ENTER: "<br />",
P: "<p>.</p>",
A: "<a href=\"\">.</a>",
_1: "<h1>.</h1>",
_2: "<h2>.</h2>",
_3: "<h3>.</h3>",
_4: "<h4>.</h4>",
_5: "<h5>.</h5>",
_6: "<h6>.</h6>"
}
}
};
I want to print out the whole 'bread crumb trail' to each object, ie CTRL ALT 6: <h6>.</h6>, but at the moment my function prints out CTRL ALT twice for 'ENTER' and then never again. The function: Code: function printObj(obj) {
for(i in obj) {
var n=i.replace("_", "");
document.write(n);
if(typeof obj[i]=="string") {
document.write(":");
document.write(" "+obj[i].replace(/</g, "<").replace(/>/g, ">"));
}
else {
document.write(n);
}
if(typeof obj[i]=="object") printObj(obj[i]);
document.write("\n");
}
}
printObj(macros);
The current output: Code: CTRLCTRLALTALTENTER: <br /> P: <p>.</p> A: <a href="">.</a> 1: <h1>.</h1> 2: <h2>.</h2> 3: <h3>.</h3> 4: <h4>.</h4> 5: <h5>.</h5> 6: <h6>.</h6> Any advice would be appreciated. Cheers, Gus Similar TutorialsI'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? Hello! I have a pretty straight forward question dealing with JQuery/Javascript (I'm pretty new to both, so the syntax is still escaping me). I have a javascript file that holds an array of objects inside of it (addresses to be exact) and I then need to take that array and call it to print into the Title attribute of a <li> after the list has been populated. Below is the Javascript arrray: Code: var banner_data = [ "address1","address2","address3","address4"];
var obj = { one:"address1", two:"address2", three:"address3", four:"address4" }
And this is how it is being called in the HTML: Code: $('ul>li').each(function(){
var $this = $(this); // current list item
var idx = $this.index();
var thisAddress = banner_data[idx];
$this.attr('title', thisAddress.append[4])
});
any thoughts? I have jQuery 1.7.1 installed, a fully valid html/css and a proper doctype (just to cover our bases haha) This is a little hard to explain so I'm posting an example. Code: //NESTED FUNCTION I'M USING TO DEMONSTRATE MY QUESTION
function foo(a) {
this.x = 5;
//USED TO SET THE VALUE OF X
if( a == 0 )
return function(z) {
return x = z;
}
//USED TO RETRIEVE THE VALUE OF X
else if( a == 1 )
return function() {
return x;
}
}
//MAKES setX THE SETTER FUNCTION
var setX = foo(0);
//MAKES getX THE GETTER FUNCTION
var getX = foo(1);
print( "setX(25), not an instance: " + setX( 25 ) );
print( "getX(), not an instance: " + getX() );
print( "" );
//CREATES AN OBJECT INSTANCE USING FOO AS CONSTRUCTOR
var q = new foo();
print( "value of x in object instance: " + q.x );
print( "" );
print( "setX(25), not an instance: " + setX( 25 ) );
print( "getX(), not an instance: " + getX() );
This code will output: Code: setX(25), not an instance: 25 getX(), not an instance: 25 value of x in object instance: 5 setX(25), not an instance: 25 getX(), not an instance: 25 Observations: It seems like this.x actually has two meanings. 1)x becomes a member of the "Function" object foo(). 2)x becomes a part of the constructor for prototype class foo. But why then does x revert back to the original value of 5 when I use foo as a constructor? Does javascript automatically save the original value on creation for a reason? What is going on behind the scenes to make this happen? Is this behavior part of an ontological model that makes sense? Similarly, if I change "this.x" to "var x" I can access the value of x but I can't change it. Not that that I should be able to, the syntax "var x" doesn't make x a member of foo anyway. But I'm still having trouble classifying the relationship "var x" has to the function. Anyways this is more of a tangent. My main question is above but if anyone has something to say about this, I'd be interested to hear it. It seems like all these behaviors have rules to them, but there is no conceptual model to think through that guide these behaviors. Or maybe I'm just ignorant. Enlighten me. I posted this once, but it disappeared, and I have no notifications that I did anything wrong. I read the rules before posting and wasn't breaking any so I am not sure why it disappeared but here goes again. I am trying to learn Javascript (particularly OOP) from a series of screencasts by Douglas Crockford. I have developed a theoretical "game" to build to illustrate it to myself better, and learn by example. I must be misunderstanding how inheritance works, because my code is not producing the results I thought it would. Here is what I have, followed by an explanation of my understanding. Code: $(function() {
function object(o) {
function Funct() {}
Funct.prototype = o;
return new Funct();
}
soldier = {
pointsCost: 0,
movement: "1 Infantry Block",
validTargets: {},
weapons: {
"Main Weapon": {
"Weapon Type": "M4 Carbine",
"Fire Range": 12
},
"Secondary Weapon": {
"Weapon Type": "JCP .45",
"Fire Range": 3
}
}
};
var rifleman = object(soldier);
rifleman.pointsCost += 10;
rifleman.validTargets.target1 = "Infantry"
rifleman.weapons["Secondary Weapon"]["Weapon Type"] = "";
rifleman.weapons["Secondary Weapon"]["Fire Range"] = "";
var heavyGunner = object(soldier);
heavyGunner.pointsCost += 20;
heavyGunner.validTargets.target1 = "Infantry";
heavyGunner.validTargets.target2 = "Light Armor";
heavyGunner.weapons["Main Weapon"]["Weapon Type"] = "SAW M249";
heavyGunner.weapons["Main Weapon"]["Fire Range"] = 12;
heavyGunner.weapons["Secondary Weapon"]["Weapon Type"] = "";
heavyGunner.weapons["Secondary Weapon"]["Fire Range"] = "";
var sniper = object(soldier);
sniper.pointsCost += 30;
sniper.validTargets.target1 = "Infantry";
sniper.weapons["Main Weapon"]["Weapon Type"] = "Savage .308";
sniper.weapons["Main Weapon"]["Fire Range"] = 20;
sniper.weapons["Secondary Weapon"]["Weapon Type"] = "JCP .45";
sniper.weapons["Secondary Weapon"]["Fire Range"] = 3;
var demolitions = object(soldier);
demolitions.pointsCost += 30;
demolitions.validTargets.target1 = "Infantry";
demolitions.validTargets.target2 = "Light Armor";
demolitions.validTargets.target3 = "Artilery";
demolitions.validTargets.target4 = "Structures";
demolitions.weapons["Main Weapon"]["Weapon Type"] = "SMAW MK153";
demolitions.weapons["Main Weapon"]["Fire Range"] = 16;
demolitions.weapons["Secondary Weapon"]["Weapon Type"] = "M1014 Combat Shotgun";
demolitions.weapons["Secondary Weapon"]["Fire Range"] = 1;
var infantry = {
rifleman: rifleman,
heavyGunner: heavyGunner,
sniper: sniper,
demolitions: demolitions
};
console.log(infantry);
});
I start by creating an object function that accepts an object passed in, and sets it to the prototype of a constructor (that would allow me to create a new object linked to, and inheriting from, the initial passed in object) I initialized a solider object literal, and pass that into the object function while creating 4 new objects (rifleman, heavyGunner, sniper, demolitions) These four should inherit from and customize upon the soldier object. The way I understood inheritance is that the new objects (example. rifleman) would inherit properties from the old object (i.e. soldier) and change or add properties, affecting only the new (rifleman) object but not changing the old(solider) object. this works ok somewhat in my example, until it comes to nested objects. In the above example I have objects as values for some Object's properties. (i.e. validTargets and weapons) When I change or add these, all of the new objects seem to inherit the last declarations, from demolitions, as if demolitions is actually changing that part of the soldier object so that the other's inherit those properties. From my viewpoint, I expected these values to not be changed and that the 4 infantry types had no link to each other, but only to the soldier object. I apparently misunderstood something, or coded something wrong. Some minor notes: -I will be updating most of the "string" values to be objects, so for instance, the validTargets value of "Infantry" would actually be the infantry object, stating that any of the 4 solider types would be a valid target. - I intend to create weapons as their own viable objects in the future, and pass those objects instead of "strings" - I intend to extend this (once this is working) to create an armor object that contains armor type units, similar in structure to the infantry object. - If I can get this all to work, I may make this into a "simple" dice style battle game. but that is way off, I just want to get this nesting of objects to work with inheritance for now. Thanks in advance for any help you can provide. Here is a link to the "live" example. (not much different there except if you have firebug you can see the console.log method showing the objects, and how they are inheriting in properly from my POV.) Link to Live example... Blue Hi, I am a begginer in javascript, please help on below I want to create an object with nested objects array like following: var country{ var states=new array(); } var state { city,pincode } this should be called like var city= country[0].state[0].city; any idea will be appreciated Hi guys ,, I am new here could you please help me in this: I have multiple divs something like this PHP Code: <div id="div1"> <div id="div2"> <div id="div3"> .... </div> </div> I want JavaScript code to print div1 with all nested divs as well I tried using the following code but it only print div1 content PHP Code: var printContent = document.getElementById('div1'); var windowUrl = 'about:blank'; var uniqueName = new Date(); var windowName = 'Print' + uniqueName.getTime(); var printWindow = window.open(windowUrl, windowName, 'left=50000,top=50000,width=200,height=200'); printWindow.document.write(printContent.innerHTML); printWindow.document.close(); printWindow.focus(); printWindow.print(); printWindow.close(); so please tell me how to do such operation ?? hello every one , i'm new and i hoped u could help me with my code I keep getting the same message "too much recursion" and i really don't know what is wrong , my friend and i codded the same way ,but it works for her not for me , here is the code : [merge sort algorithm] Code: var A=[2,999,45,23,17,879];
var B=[];
var C=[];
var i;
var j;
var k;
var x=0;
var mergesort_counter=0;
var merge_counter=0;
mergesort(A);
//=========================================================
//document.write( "<h2>mergesort</h2><p>", A, "</p>" );
function mergesort(A){
var n=A.length;
mergesort_counter++; //count mergesort calls
document.write( "<h2>mergesort</h2><p>", A, "</p>" );
var mid=Math.floor(n/2);
if (n>1){
for (i=0;i<mid;i++){
B[i]=A[i];}
for(j=mid;j<n;j++){
C[x]=A[j]; x++;}
mergesort(B);
mergesort(C);
merge(B,C,A);}
else document.write("the list is too short ");}
function merge(B,C,A){
merge_counter++; //count merge calls
i=0;k=0;j=0;
while( i<B.length && j<C.length ){
if (B[i]<=C[j]){
A[k]=B[i];
i++;}
else{
A[k]=C[j];
j++;}k++;}
if(i==B.length)
for (var l=j; l<C.length ; l++)
{A[k]=C[l]; k++;}
else for (var l=i; l<B.length ; l++)
{A[k]=B[l]; k++;}
document.write( "<h3>merge</h3><p>", A, "</p>" )}
this code: Code: $(document).ready(function() {
$('body').click(function(evt) {
if(evt.target.nodeName === 'A' && $(evt.target).hasClass('cross-link')) {
$('a[href=#2]').trigger('click'); } });});
gives me and error of "too much recursion" how can i solve this? Hey im having a problem recursively calling my function. What I want to do is to change MyImages[0-14] with a timeout between them. Here is my code. Code: function swapImage(i) {
if(i < 15)
{
MyImages[i].src = "red_dot.gif";
setTimeout("swapImage(i+1)",500);
}
}
The problem is that it will only change MyImages[0] and MyImages[1] Hi, can anyone tell me... Code: function Obj() {
this.recursiveMethod=function () {
//...how to invoke Obj.recursiveMethod from here?
}
}
Gus Code: function checkifischild(draggedElement,destination)
{
$getid = $("#" + destination).attr("class");
var __temp = $getid.split(' ');
console.log(__temp)
for(i = 0;i < __temp.length; i++){//for the length of the classes
if(__temp[i].match("child-of-"))
{//check if its a child
parent = __temp[i].substring(9);//get the parents node
if(draggedElement == parent)
{
console.log('yes');
return false;
}
}
}
checkifischild(draggedElement,parent)
}
i have the following function basically what it does it gets 2 parameters node-23,node-17 for example it finds the classes of node-17 and splits them up ["child-of-node-16", "initialized", "ui-droppable", "expanded"] ["child-of-node-19", "initialized", "parent", "expanded", "ui-droppable"] ["child-of-node-23", "initialized", "parent", "expanded", "ui-droppable"] so i compare each time the first parameter along with the substring of the child-of and if they are the same its returns false now my problem is if i call the function just like this checkifischild(node-23,node-17) it works i get in the console yes for example if i do this tho if(checkifischild(node-23,node-17) == false) it fails :? any ideas will be appreciated thxxx Hello I am trying to create a family tree, parents / grandparents etc, of a single person... My database etc is already working but I cannot find any working examples that I can make sense of... Each of my records has a name, dob and id of each parent.... How can I get X generations from this.. I thought something like this might work.. GetParents For each parent GetParents And so on... But I have no idea how to put this into code... Any suggestions to put me on the right line would be greatly appreciated Thanks Well, I clearly haven't the experience with javascript to understand why I can't do this: Code: function bubbleSortKernel(a, b) {
if (b < 50) {
swap(a, b);
draw();
setTimeout("bubbleSortKernel(++a, ++b)", 200);
}
}
where Code: swap(a, b) does just what it says: swaps the two elements in an array, and Code: draw() looks about like this: Code: function draw() {
if (ctx != null) {
ctx.clearRect(0, 0, width, height);
for (var i = 0; i < rectangles.length; i++) {
ctx.fillRect(x, rectangles[i][0], rectangles[i][1], rectangles[i][2]);
}
}
}
I'm newer to javascript that other things, and this seems perfectly legal to me. I'm looking for someone who knows more that I and can explain what I'm missing. I'm guessing my timeout doesn't really work like I think it does, but I've gotten so frustrated I can't see the forest for the trees. Any help or nudge is greatly appreciated. Thanks! well, when i do this fucntion: function scroll(){ window.scroll(0,60) } i get a javascript error: Error: too much recursion well, what is wrong? what does that mean? how do i fix it? thanks for any help 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! 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>
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 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 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! Is it possible to create an array of objects? I require a two dimensional array of objects. Thanks! |
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