Dynamic Acess Of Objects
Jul 20, 2005
i am creating a page that creates 10-45 text input areas dynamically in a
for loop. all the fields will be identical except for content, and i need a
button to clear each corresponding field individually(also dynamically
created). i have tried to do it various ways, but i cant get the proper
object declared, i always get object does not exist or object undefined
errors. I dont even know what this is called so that i can look it up. im
kind of lost as how to solve it. Code:
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Sep 14, 2010
I have an issue. I need to access MapQuest JavaScript API and develop maps. I am able to do that on my personal laptop. I want to develop the same on my work laptop and with in my company environment(network). I have
1. We have a firewall which doesn't allow me to access the Mapquest Javascript API.
2. I was give a proxy server name and port number through which I can access the mapquest javascript api.
I need to use this proxy server with in the code that is what the systems team say. I don't know how achieve this using JavaScript. I can't use any other language except Javascript or HTML.
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Apr 17, 2011
Is there a way in Javascript or Jquery to return an array of all objects underneath a certain point, ie. the mouse position. Basically, I have a series of images which link to various web pages but I have a large semi transparent image positioned over the top of the other images. I want to find the href of the background image that the mouse pointer clicks over.
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Sep 5, 2009
Is there a better way to extend object with internal objects?
$.fn.bestShow = function(s) {
var d = {
width: 0,
height: 0,
order: "numeric",
orderBy: "",
[Code]...
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Jun 29, 2010
how to populate a dropdown based on Another dropdown selection. This all should be a dynamic. Eg: I have two text boxes one is TechID and other is JOB ID. When I start typing Tech ID it suggests me the list of IDs which start with the input string i have put in Tech textbox. When i select the Tech ID the jobs associated to that Tech ID should be displayed in JOB ID text box as a dropdown list.
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Jul 23, 2005
I am having a problem with the last results. I can't seem to be able to
get the input2A and input3A to appear. I don't seem to have a problem
with the show and hide after a number is entered and submitted. If
anyone can answer my problem I will be greatly appreciated with a
prize. I actually have submitted it more than once and I haven't had
anyone been able to answer it yet. Code:
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Jul 1, 2011
i was trying for some days now to find a solution for this. had a look at different posts and forums online, but no luck so far...is it possible to auto-create this with a loop???:
Code:
T$('infowindow1').onclick = function(){ setInfobox('1'); }
T$('infowindow2').onclick = function(){ setInfobox('2'); }
[code]....
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Jun 30, 2009
I've been beating my head against a wall for a few days trying to get this working. I'm trying to create a dynamic menu where a user selects one item and another select list is shown, then another and another (and so on). Here is my JS, it *should* be taking the ID of the div, comparing it to the selected value and then showing another div by settings it's class property to visible:
[Code]...
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Oct 25, 2010
I have made a script where you can add extra fields, and next to the row is a span that automatically displays the outcome from a calculation of three fields in that row. i.e. Q x (B - A) = total. Here is the bit that does the calculation:
function advCalc(selected) {
var result = Number(document.formmain.elements["quantity"+selected].value) * (Number(document.formmain.elements["provideamount"+selected].value) - Number(document.formmain.elements["supplyamount"+selected].value)) ;
[Code]....
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Sep 6, 2011
I will like to know if there is anyway to view all the rules that I have currently in the Jquery validation plugin. Currently, I am trying to add in rules dynamically through the rules(add) function after adding some dynamic fields through the user inputs. the rules are added in this manner.
[Code]...
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Aug 3, 2005
I am trying to figure out how to use objects properties in my code so
when the page loads All my properties are in object where I can use
elsewhere in my page. Code:
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Jan 3, 2006
I'm trying to use the following code to load xml files:
ImportXML = function (ts) {
this.file = ts;
if (document.implementation &&
document.implementation.createDocument) {
this.doc = document.implementation.createDocument("", "", null);
this.doc.obj = this;
this.doc.onload = this.callBack;
this.doc.load(this.file);
} else if (window.ActiveXObject) {
this.doc = new ActiveXObject("Microsoft.XMLDOM");
this.doc.onreadystatechange = this.ready;
this.doc.obj = this;
this.doc.load(this.file);
} else {
alert("Error");
}
}
ImportXML.prototype.ready = function () {
if (myDoc[counter].readyState == 4) this.obj.callBack();
}
ImportXML.prototype.callBack = function () {
alert('loaded');
}
var xmlDoc = new ImportXML("bar.xml");
The problem I'm having is with the second line that reads
this.doc.obj = this;
IE tells me that object doesn't support this property or method. How is
it possible to get a reference to the object (xmlDoc) in the prototypes
'ready' and 'callBack" with IE?
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Jul 23, 2005
Where is the list of js objects (Anchor, Applet, document, etc)? It's not in the Netscape Guide or Core documents.
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Jul 20, 2005
If you have a javascript interpreter running in an environment unknown
to you (as in what objects it exposes to the language) is it possible
to loop through all objects in some way?
This is a non-browser environment, specifically the scripting engine
for doing xslt extensions in msxml.
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Jan 22, 2011
I have the following 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.
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Jul 4, 2011
"When we combine FUNCTIONS with OBJECTS we get METHODS". Then he creates an empty ARRAY:
var a = [];
then he uses the "push() method" to add elements to the array.
a.push(1,2,3);
uh, methods are for *objects* right? Yet he is using them on an ARRAY.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?
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Mar 10, 2007
I've often write javascripts that use this rather common code to get all tags in an XHTML document:
var alltags = document.getElementsByTagName('*')
... and then use a for loop to access the elements as an array, for example:
for (i=0;i<alltags.length;i++) {
elementClass=alltags.className
[i]Do stuff
}
This has always seemed to work in the past, but I recently learned that the getElementsByTagName method returns a DOM NodeList, not an array. I'm currenly working on a project that needs to access the children of an element conditionally upon its class.
I have three questions. First: How do I declare a global variable to be a DOM NodeList object? It wouldn't be assigned until called from a function, so something akin to var elementList = document.getElementsByTagName() in my global declarations is out of the question. Is there something like var elementList = new NodeList() in javascript? (I know that I can assign it in a function without the var and it will be global, but other people may have to work with this code, and I'd like to have it clearly declared at the head of the program.)
Second question: Assuming alltags is a NodeList returned from a getElementsByTagName call, which of these is proper? This:
childElements = alltags[i].getChildNodes()
... or this:
childElements = alltags.item(i).getChildNodes()
And finally, which of the above techniques has better browser support?
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Jun 20, 2007
I recently had a problem where I needed to build up an array of strings, that would be join()ed into a string when the array building was complete. however, each value could only be in the array once.
This was a problem for a few reasons. Once a value has gone into an array the only way to check for it that works cross-platform is to scan the array looking for the value. FireFox has the every() and some() functions but they don't work in anything else.
Using an object to simulate an assocaiative array would allow me to avoid this problem by storing key/values with the keys having the same value as the value I was storing. I could then use the (a in b) construct to check that I had not already added a value.
However, array type methods won't work with objects, so I had no access to size () or join () meaning I'd have to manually build the string by iterating over the object.
My solution was to use an array object, but to store the provided data i nboth the array proper and as a property of the array object.
var myArray = new Array;
function addVal (val)
{
if (!(val in myArray))
{
myArray [val] = 1;
myArray.push (val);
}
}
addVal ('one');
addVal ('two');
addVal ('three');
addVal ('one');
addVal ('two');
addVal ('three');
console.log (myArray.length);
console.log (myArray.join (', '));
This approach does use up more memory but it does give me the advantages of both arrays and objects for little extra work. (if you don't have FireBug then replace console.log with alert)
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Dec 20, 2005
I know if I use this code:
var arrTD = document.getElementByType('td')
That arrTD will have an array of "HTML DOM TableData Objects".
Now what is the best way to access each object and see what it contains. I would like see which properties each object has and what their values are. I also guess there could be some other objects within the TD object and maybe even some events and methods.
Now I have been reading an on-line reference about DOM, but I think it is a little dated.
http://www.w3schools.com/htmldom/default.asp
For example I know that a <TD> can contain class="something" but I could not find a property called class, but it did list others like id, align etc.
I would like to learn how to access and view the contents of a DOM object.
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Apr 22, 2010
I would like to have page which uses a few xhr objects and automatically (after 30 seconds) starts the same few requests again It works for me well in IE7, IE8, but not IE6 (where is in browsing history chosen option "automatically" ). It works there only for first time and I can't set it for circular reloading. It looks like page is reloaded, but xhr objects are not doing their job ...only - as I wrote - for first time after page load.
I have tried a lot of things:
- headers: no-caching
- window.reload(true)
- window.setInterval
- window.location.assign
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Jan 5, 2011
I tried to set an onclick event with:
node_a.setAttribute("onClick","visibility_on_off_by_el('"+node_b+"');");
where node_b is a pointer to a DOM object: node_b = document.getElementById("a") The reason I passed a DOM object into a variable, was to avoid searches document.getElementById() each time. However, it will not work. I am confused I cannot figure out if it a a mistake of mine or just the way javascript works.
Could anyone explain why I cannot use variables as DOM objects in order to avoit each time a tree search document.getElementById("a")? Bellow is given the code with explanation when it works and when it fails.
[Code]...
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May 29, 2003
Does anyone know of any generic code to clone an object (which only contains properties), which copies by value, not just reference?
It seems as though there should be some sort of prefab recursive function that could work for any old object, so I didn't want to re-invent the wheel Code:
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Oct 28, 2003
I am dabbling with objects and have successfully created an object with various properties, one of which is an Array, and all is fine. the Question I have is can I make an Array of objects? I have the following object:
dataSeries.Type = value
dataSeries.Name = value
dataSeries.dataPoints[n] = Array of values
dataSeries.color = value
What I would like to do is have an Array of multiple objects supposedly like:
dataSeries[0].Type = value
dataSeries[1].Name = value
dataSeries[2].dataPoints[n] = Array of values
dataSeries[3].color = value
Is this possible?
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May 30, 2005
I've tried breaking out an application I'm working on into smaller objects. I have always had the objects built out, but they were nothing more than local variables. So I tried to create a few methods and include them in one of the objects (the Map object). Code:
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Jul 3, 2005
I have a data structure that is composed of an array of JavaScript objects (my own created classes) that I need to pass as a parameter to an URL:
I would like to know if there is a way to serialize this array, send it as a string, then deserialize it on the other side, resulting with the data structure again I am trying to avoid doing the serialization myself.
Each entry in the array holds an object of type Person:
function Person(name, age, children) {
this.name = name;
this.age = age;
this.children = children;
}
where children is an array of Person objects
Is this sort of thing possible?
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Sep 30, 2006
Can anybody explain to me what it means when a Date object method "operates" under UTC? I know that local time and Universal Time Coordinated (GMT) are different times, but what does that have to do with using the Date methods?
For example, let's say that I create a new Date object like this:
var lovelyDate = new Date(2006, 3, 30);
What then, would be the difference in using the methods
lovelyDate.getDate()
lovelyDate.getUTCDate()
?
Shouldn't they both return 30?
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