Dynamically Creating And Naming Objects?
Oct 13, 2010
I've got an input with a value. The input is called 'command2' and I want to send it's value to the 'rover2' object (although I don't know if that object exists yet). I test and say if(rover2){... and if not then I create the object/if so then I insert the value.Question is: I want to do:Code JavaScript:var rover2 = new Rover();but I want to pass the name of the new object by association, so in effect:Code JavaScript:var "rover"+i = new Rover();How would you do that? So that the objects and their names are generated dynamically (or [perhaps a better explanation] so that the string value of a variable can be used as the name of new variable/object)?PS Bonus marks: If I hold HTML fragments as an object and those fragments include inputs, is the value of the input collected as well? i.e. if I have
Code HTML4Strict:
<fieldset>
<input id="foo" type="text" />
[code]....
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Apr 6, 2010
I have the following code which adds a dynamically created textbox to a form:
function addarow() {
if (count > 5) {return false}
count ++;
[code]....
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Oct 3, 2011
As they all have the same property set but with different values I thought I'd try creating a servo object, the create an array of servo's but I don't think I'm getting anywhere fast. Heres what I have
<!DOCTYPE html PUBLIC "-W3CDTD XHTML 1.0 TransitionalEN" "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>Untitled Document</title>
[Code]...
Once this is done and I've got all the servo objects created with their properties, I'm hoping to be able to search for all servo's with a set property i.e all servo's with servo.application = 1 would that be possible, if not I geuss I'd be wasting all our time trying to create classes I can't use the way I'd like.
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Oct 7, 2010
I have a tab compopenet object that works by passing a dom element to a constructor... which then finds all the relative elements to that element using .find() and adds the necessary behaviour. Now, since I have multiple tab components on the same page, I'm using each() to iterate through the dom elements and pass each into the tab component constructor function.
[Code]...
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Jul 20, 2005
Lets say I have this array:
a1 = [1,"2",new Array(2.5,3,3.5),4];
And I apply slice(0) on it, to create a copy:
a2 = a1.slice(0);
But this isn't a true copy. If I go a1[2][1] = 42, and then
alert(a2[2][1]) I will see 42 there too. I'm doubting, but I was
wondering if there is a general solution to this problem?
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Oct 7, 2010
I have a tab compopenet object that works by passing a dom element to a constructor... which then finds all the relative elements to that element using .find() and adds the necessary behaviour.Now, since I have multiple tab components on the same page, I'm using each() to iterate through the dom elements and pass each into the tab component constructor function.[code]This works fine for my purposes, but after running my code through JSLint and researching here (URL...), I've been made aware that I'm pretty much throwing these objects away, since I'm not assigning them to a variable.My question really is; is this particularly bad practice under the circumstances? If I assigned the object to a variable within .each(), I'd surely be overwriting that varibale with each iteration and essentially doing the same thing?
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May 10, 2010
if I am loading content into a div using the get feature of jquery, and that content has some clickable objects in it will jquery recognize those as well? What I am doing is building a site that tracks bugs on our software. The site pulls the bugs from a mysql db and displays in a table format. There's an edit link which passes the record id number of that bug (via ajax) to a php file, where a form is filled in with the bug data and passed back, a hidden div is then shown with the form in it. Part of the code I pass back has a submit button and a close button (css styled anchors) and I'm using the same process on them as I am on the edit link but not getting any results. My script looks like this:
<script src="js/jquery.js"></script>
<script language="javascript">
$(document).ready(function(){
//hide edit form
[Code].....
how it works. Does it sneak peek the page after it loads and get all the objects into some sort of array? I'm thinking it is doing that and because I am adding other object through AJAX it is not seeing those, since the page is not being reloaded.
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Sep 16, 2011
I have to stuff multiple objects in global var populated in a foreach loop and seperated by a comma.The loop is:
// GlobalG.objects;
$('.class').each(function() {
var title = $(this).text();
var src = $(this).attr('src');
[code]....
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Jan 30, 2011
ok, so I can make an object, I can also make a new instance of that object and have it running around the screen at the same time.What I'm a bit confused about is how to go about things when I want X number of these objects.So instead of making objects seperately I need a loop. Instead of referring to each object seperately every time I want to redraw it, I want to loop through all instances of the object.Except I can't quite see how one goes about doing this.
for (i = 0;i <= 10; i++) {
var dot + i = new Dot;
}
[code]....
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Mar 16, 2010
I am creating a frogger game. When the frog image collides with a vehicle image, I wish for the frogs position to be reset back to the start. Here is my code which is currently not working:
Code:
// Frog Collisions: (CURRENTLY NOT WORKING)
var cvehicle=new Array(0,
document.getElementById("car1"),document.getElementById("lorry1"),document.getElementById("car4"),document.getElementById("lorry2"),document.getElementById("car2"),document.getElementById("car3"),
document.getElementById("lorry3"),document.getElementById("car5"),document.getElementById("car6"),document.getElementById("car7"),document.getElementById("car9"),document.getElementById("car10"),
[Code] .....
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Apr 23, 2007
I've been pretty infatuated with JSON for some time now since
"discovering" it a while back. (It's been there all along in
JavaScript, but it was just never "noticed" or used by most until
recently -- or maybe I should just speak for myself.)
The fact that JSON is more elegant goes without saying, yet I can't
seem to find a way to use JSON the way I *really* want to use it: to
create objects that can be instantated into multiple instances without
prototyping. I've seen (and used) JSON for singleton object instances
-- this not a problem and this is how it works right out of the gate.
But given the following custom object written the past "normal" way, I
would like to write it in JSON format, and then be able to create new
instances from the one definition. Here's an example using the "old
way" most who have been writing JavaScript for years have seen:
function Two( x, y ) {
this.x = x;
this.y = y;
}
Two.prototype.sum = function () { return this.x + this.y }
Two.prototype.max = function () { return this.x this.y ? this.x :
this.y }
Two.prototype.min = function () { return this.x this.y ? this.y :
this.x }
Two.prototype.pow = function () { return Math.pow( this.x, this.y ) }
Now, I know I can get all "fancy" with the above and do either this:
Two.prototype = {
sum : function { return this.x + this.y },
max : function () { return this.x this.y ? this.x : this.y },
min : function () { return this.x this.y ? this.y : this.x },
pow : function () { return Math.pow( this.x, this.y ) }
};
Or this:
function Two( x, y ) {
// Properties.
this.x = x;
this.y = y;
// Methods.
this.sum = function () { return this.x + this.y }
this.max = function () { return this.x this.y ? this.x : this.y }
this.min = function () { return this.x this.y ? this.y : this.x }
this.pow = function () { return Math.pow( this.x, this.y ) }
}
(The later seems to work without prototyping...!)
But neither are really as close to pure JSON as I would like, so that
I can instantate those:
var hisPair = new Two( 11, 22 );
var herPair = new Two( 33, 44 );
What I'd like is a way in PURE JSON to be able to create the Two class
(as an example) using pure JSON. I've not seen anything yet on the
web that addresses this directly aside from some pages which require
you to include another JS to allow "deep embedding" of classes using
other helper "classes" (that are created the "old way" it seems), etc.
The best I've found so far on using pure JSON to create a class that
allows *multiple* instances is something like this:
function Two( x, y ) {
var class = {
x : x,
y : y,
sum : function { return this.x + this.y }
max : function () { return this.x this.y ? this.x : this.y }
min : function () { return this.x this.y ? this.y : this.x }
pow : function () { return Math.pow( this.x, this.y ) }
};
for (var element in class) this[element] = class[element];
}
Now *THAT* works, but it's still not as "pure" I would like. But it's
acceptable for now, I guess, since I *am* creating the entire "class"
as a JSON object, and I consider the outside function "wrapper" as the
necessary "constructor." But I keep wondering... There HAS to be a
better way.
I'm just wondering if anyone knows of a place that discusses JSON used
in situations like the above. Again, I've seen an ABUNDANCE of pages
and sites that discuss JSON in Singleton usage, but nothing that
discusses it as I am wanting here.
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Jun 23, 2006
I am trying to add an event listener to the keyup event for some text
inputs that I am creating dynamically. I have no problems getting it
to work in Firefox, but IE just ignores them. I have created a few
functions to aid in making this process work semi-cross-browser. (I
develop in FF, but everyone who uses it will be using IE6.) ....
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Jun 27, 2011
I have part of a script like so:
var audioPlaylist = new Playlist("2", [
{
mp3:"audio/eight-day-week.m4a"
[code]....
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Jun 3, 2009
I'd like to do something like this: After the page is loaded I have some forms with submit buttons. The buttons have a class called "open". By clicking any of these buttons the script is using AJAX to take some data from database and add some HTML to the document. This part of generated HTML has also buttons with a class "open". By clicking any of the new buttons script should do what it does with the old ones. The problem is I have no idea how to "refresh" a click function. After generating HTML it "sees" only the old buttons.
Here's some code:
$(document).ready(function(){
$(".open").click(function(){
var idVal = $(this).parent().parent().find("#PlaceId").val();
if($("#admin_places_"+idVal).html()=='')
[Code].....
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Feb 17, 2010
function get_states(country_element,state_element){
countryElementIDHash = "#" + country_element;
stateElementIDHash = "#" + state_element;
$(stateElementIDHash).empty();
var geonameId = $(countryElementIDHash).val();
$.getJSON("[URL]",
{ 'geonameId': geonameId },
function(data) {
if (data.geonames == null) alert('No regions');
$.each(data.geonames, function(i,item){
$(stateElementIDHash).append($('<option>' + item.name + '</option>'));
});
});
}
I'm writing a function to populate a SELECT based on the select value of another SELECT. I can't figure out why this isn't working. It has something to do with not having "'s in my $(). for example: If this function wasn't dynamic.
The code:
$(countryElementIDHash).val(); could simply be
$("#country option:selected").val();
How can I pass dynamically assigned names into a $() ?
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Feb 3, 2011
I'm new to js and jquery. I need to get access to select forms which are named dynamically. I have no problem when named statically, so this works fine:
[Code]...
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Feb 10, 2010
I'm using the following code to create a quick and dirty search tool for a site we're building at work as part of an RFP.My issue is that rather than creating a new window for the results page (which is what it does now), I'd really prefer that a new div be dynamically created on the page where the results would be placed.Maybe that's not possible? At the very least,how to make the results display in the same window rather than opening a new one?
<SCRIPT LANGUAGE="JavaScript">
var item = new Array();
// "Page Name","path","Page Title","Many,Key,Words","Descriptive Comments"
[code]....
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Mar 15, 2010
I created <a> tag dynamically and attached event to it.
Code:
var link = document.createElement("a");
link.setAttribute('class','devNodeStyle');
link.setAttribute("title",device);
link.setAttribute("href","javascript:void(0);");
link.attachEvent("onclick",openDevDetailWindow);
"attachEvent" is working only in IE. How to make that working in other browsers like Chrome/FF?
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Jul 23, 2005
I'm trying to create a fairly simple form which contains a label, a
button, and a textbox.
I've done quite a bit of reading and, from what I can figure, the
following should work, but isn't....
var rowCommentBox = document.createElement("TR");
var cellCommentBox = document.createElement("TD");
var frmCommentBox = document.createElement("FORM");
frmCommentBox.setAttribute("METHOD", "POST");
var strAction = ""submitComments.asp?Org="+strOrg+"&date="+activeWeekBegins""
frmCommentBox.setAttribute("ACTION", strAction);
var rowFrmCommentBox = document.createElement("TR");
var cellFrmCommentBoxLabel = document.createElement("TD");
var strFrmCommentLabel = document.createTextNode("comment:");
var cellFrmCommentBoxButton = document.createElement("TD");
var btnFrmCommentBoxButton = document.createElement("INPUT");
btnFrmCommentBoxButton.setAttribute("TYPE", "SUBMIT");
btnFrmCommentBoxButton.setAttribute("VALUE", "UPDATE");
var cellFrmCommentBoxTxtbx = document.createElement("TD");
var txtbxFrmCommentBoxTxtbx = document.createElement("INPUT");
txtbxFrmCommentBoxTxtbx.setAttribute("TYPE", "TEXT");
txtbxFrmCommentBoxTxtbx.setAttribute("cols", "50");
txtbxFrmCommentBoxTxtbx.setAttribute("VALUE", strComments);
cellFrmCommentBoxLabel.appendChild(strFrmCommentLa bel);
rowFrmCommentBox.appendChild(cellFrmCommentBoxLabe l);
cellFrmCommentBoxButton.appendChild(btnFrmCommentB oxButton);
rowFrmCommentBox.appendChild(cellFrmCommentBoxButt on);
cellFrmCommentBoxTxtbx.appendChild(txtbxFrmComment BoxTxtbx);
rowFrmCommentBox.appendChild(cellFrmCommentBoxTxtb x);
frmCommentBox.appendChild(rowFrmCommentBox);
rowCommentBox.appendChild(frmCommentBox);
tbodyOrgToAdd.appendChild(rowCommentBox);
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Jul 20, 2005
Given an expression f = ƈ*x+3' from a user input I would like to do some sort of:
function userFunction(x):
return f(x)
is it possible with Javascript?
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Sep 24, 2009
I know this is not strictly related to jquery but I don't know how to make it works. I'm working on a function that has as variable an array and for each element I need to create a piece of code for an other function. For instance when the array contains [0,1,2] I need to call
[Code]...
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Sep 20, 2009
im trying to create a script for greasemonkey but its still written in javascript. so here is what im trying to do. Ive got a dynamically created division that aligns to the right of the browser window. Now im trying to put links inside it as you normally would with like a document.write statement or other methods. The only problem is, any method i try wont work for me. heres my code, maybe someone could give me some things i could try.
[Code]....
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Apr 21, 2011
I am trying to create a function that creates an array comprised of filenames based on a given range. I.E if 2-8 is selected and a foldername of UMCP/ and a common name of college is also given, the function should return and array such as [UMCP/college2.jpg,UMCP/college3.jpg.....UMCP/college8.jpg]. Here is what I've got but the alert that should tell me the filename of the first image says it is undefined, how can i fix this?
function getArrayPhotosNames (total,count,first,last) {
/*window.alert("get Array Photo Names");*/
var folderName = document.getElementById("photofold").value;
var Alias = document.getElementById("commonName").value;
[Code]....
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Aug 9, 2003
Here's my problem: I need to create a variable name dynamically, made up of a string (say "var_name_") and an integer. Ultimately I want something like this:
var_name_1 = 'whatever value I want'
var_name_2 = 'whatever value I want'
var_name_3 = 'whatever value I want'
...
var_name_N = 'whatever value I want'
But the actual variable names are determined at run-time, so I can't just hardcode them.
Any suggestions? JavaScript doesn't seem to have a Variable type, so I can't just cast a string into a var...
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Dec 2, 2010
As part of my form I have a box for the user to input the number of text boxes needed. I already have the page creating the textboxes but do not know the IDs of each text box. Once the user adds textboxes they can click add again to create more. If the user previously added 3 textboxes and now enters 4 I want the program to just add one more instead of 4 more.
[Code]...
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Aug 20, 2010
I have form that asks a simple question: "How many XYZs do you want to create?" Then, for every XYZ, it should create several new labels/inputs in the form.
That is, every XYZ looks like this:
<div id="xyz">
<label>Whatever</label>
<input> blah blah blah </input
</div>
I looked into .each() and .live(), but I can't wrap my mind around how to do this.
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