Failure Of Inheritance From A Style Statement?
Oct 20, 2009
The first div in this example has the position property stated in the div itself.
The second has it stated in a separate style statement, and it doesn't get inherited, though another property from the same style statement DOES.
Firebug makes no complaints.
Is there a better way to refer to the jquery library files, so that you don't have to fix my pointers to my local library?
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
[Code]....
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Mar 4, 2007
In my research in the javascript language I have encountered problems
with implementing prototype inheritance while preserving private
methods functioning properly. Here is an example: Code:
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Mar 3, 2005
Suppose I have:
Code:
function A() { ... }
function B() { ... }
What's the difference between:
Code:
B.prototype = A
and
Code:
B.prototype = new A
?
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Aug 17, 2006
Let's consider this example:
function Polygon(iSides) {
this.sides = iSides;
}
Polygon.prototype.getArea = function () {
return 0;
};
function Triangle(iBase, iHeight) {
Polygon.call(this, 3);
this.base = iBase;
this.height = iHeight;
}
Triangle.prototype = new Polygon();
Triangle.prototype.getArea = function () {
return 0.5 * this.base * this.height;
};
Here are my questions:
1/ "Triangle.prototype = new Polygon();" : Doesn't this line overwrite all the properties already defined in the Triangle function?
2/ "Triangle.prototype = new Polygon();" : Won't this same line assign this.sides an empty string (or undefined ??) if one considers that the polygon function has no arguments? Or does writing ...prototype = new SomeClass() only "touch on" the methods?
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Jul 23, 2005
I've discovered the following problem while building an APP:
/* Code Start **************************/
// Definition
function cClass_prototype_prototype()
{
this.array = new Array;
this.className = "cClass_prototype_prototype";
}
function cClass_prototype()
{
this.className = "cClass_prototype";
}
cClass_prototype.prototype = new cClass_prototype_prototype;
function cClass1()
{
this.className = "cClass1";
}
function cClass2()
{
this.className = "cClass2";
}
cClass1.prototype = new cClass_prototype;
cClass2.prototype = new cClass_prototype;
oClass1 = new cClass1();
oClass2 = new cClass2();
// Testing
alert(oClass1.array)
alert(oClass2.array)
oClass1.array.push(1);
alert(oClass1.array)
alert(oClass2.array)
/* Code End ****************************/
If you will execute this code you will see that pushing an value into
the first class instance array property cause changing value of the
second class instance array property.
Is it possible to have array values not connected to each other?
I would like to avoid defining "array" property in cClass1 and cClass2
(in this case it would work the proper way) and have them defined only
in third-level parent class cClass_prototype_prototype.
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Jul 30, 2010
please bear with my noobishness, but i've been trying for many hours to understand what is going on behind this code:
[Code]...
actually construct an instance of Employee if the reference to its constructor has been replaced by an instance of Person that only contains name and age properties? how is Ken ever initialized by Employee constructor?
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Aug 29, 2006
I'm looking to do something like this:
function superDuperObject(range) {
this.startContainer = new superDuperObjectStartContainer(range);
}
function superDuperObjectStartContainer(range) {
this.calculatedContainerNumber = doSomethingAndGetSomethingBack(range);
return range.startContainer
}
function doSomethingAndGetSomethingBack(range) {
return
someCoolInformationThatICalculateInThisFunctionTha tNeedsTheRange;
}
var myObject = new
SuperDuperObject(DOMRangeObjectThatIDefindedEarlie rInCode);
// Show me the startContainer of
"DOMRangeObjectThatIDefindedEarlierInCode"
alert(myObject.startContainer);
// Show me the calculatedContainerNumber that I get from a function
that does stuff with the range passed to it
alert(myObject.startContainer.calculatedContainerN umber);
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May 28, 2010
Basically i have a good experience and knowledge with prototype.js library and also at the same time i am willing to get deeper into jquery.
I very much use oops concept now a days in almost every problem i solve using javascript, and was doing with prototype's feature to create classes and objects. Since i am now looking to get deeper into jquery, i was looking to find similar feature in jquery as well. I suppose jquery must be having a feature to create classes and do inheritance programming, but i couldn't find the way. My question to the forum is, Is there any option/feature in jquery which helps us to create classes and objects of our own probably with the support of inheritance?
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Dec 29, 2010
What are the benefits of prototypal inheritance over classical inheritance?
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Sep 20, 2005
What I am trying to achieve is an 'inherits' method similar to Douglas
Crockford's (http://www.crockford.com/javascript/inheritance.html) but
that can enable access to the superclass' priviledged methods also. Do
you know if this is possible ?
In the following example, I create an ObjectA (variable a), an ObjectB
which inherits ObjectA (variable b) and an ObjectC which inherits
ObjectA (variable c1). The 'toString ()' method of ObjectC refers to
the 'toString ()' method of ObjectA. This is possible because the
'Object.inherits ( superClass )' method adds a reference to the
superClass of an object in the object's prototype.
If I understood things correctly, the prototype is the same for all
objects of class ObjectC. Therefore, I should be able to only add the
reference to the superClass once. That is the purpose of the
'Object.initializedPrototypes' array : it keeps track of the objects
for which a reference to the superClass has been added to the
prototype.
However, when I create another instance of ObjectC (variable c2), its
prototype doesn't contain any reference to the superClass.
A workaround for this problem consists in adding a reference to the
superClass for each instance of the inferiting object (either by
bypassing the check to Object.initializedPrototypes or by adding the
reference to a priviledged member such as 'this.superClass' instead of
'this.prototype.superClass'). However, in terms of memory usage or of
"programming elegance", this seams to defeat the whole purpose of using
prototypes.
Here is the code, if any of you have got ideas...
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Nov 17, 2009
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. $(function()
[Code]...
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Jul 23, 2005
I am trying to get an alert box with line breaks in it. I want to display a couple pieces of information, and want them broken up. I tried using to get a new line, but kept getting errors in my code.
alert("The combination you have selected: " + + "Background Color: " + color1 + + "Text Color: " + color2)
Of course color1 and color2 have been declared and defined, so I know there isn't an error there.
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Apr 4, 2011
my webstie allows users to change the color of the background, so to keep the text readable I have it changing as well.the color picker I am using has text boxes with rgb values 0-255 for each.I am trying to get one bit of text to alternate between red and blue with the conditions
Code:
if(blue>green && blue>red)
{
[code]....
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Apr 5, 2007
In prototype with ajax.updater you can chose to show errors in another div than the one you want "real" content in.
Code:
new Ajax.Updater({ success: 'items', failure: 'notice' }, 'ajax_req.php', {
parameters: { text: $F('text') },
insertion: Insertion.Bottom
});
But all information i print out from ajax_req.php gets in the items div. How can i print out errors from ajax_req.php into the notice div?
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Jul 23, 2005
My original idea of two trains, however pictural it was, appeared to be
wrong. The truth seems to be even more chaotic.
IE implements its standard down-up model: any mouse event goes from the
deepest visible element to the top. By carefully studying fromElement
and toElement properties, one can handle events on any point of their
way up.
NN/FF implements a "Russian hills" style: mouse events go first
up->down (window->deepest element), and right away after that it goes
down->up (deepest element->window). On theory you can handle events
during any phase on any level. On practice this implementation has some
major flaws. I don't have NN handy right now, but in FF we have:
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May 12, 2009
Variables are reaching the php but callback isn't firing. Multiple forms on the page - I've stripped out everything extraneous to try and get a callback. (strangely Firefox 3.0.10 hits the php but breaks while running Firebug(?) and doesn't seem to work in Safari 3.1.2) Sorry if this is covered but been searching and can't solve. php included in case I'm doing something wrong there (as well?) javascript always breaks when I get my hands on it
[Code]...
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Sep 18, 2010
I am trying to figure out a way to have a page redirect if the mysql connection fails. The issue is that the page is already loaded and the only time this would be needed is if the user tries to perform operations on a loaded page after the session runs out.
So basically, I have a page that will allow you to search for an item using ajax, then select an item and press add which will place the item in another table displaying detailed information. Both operations connect to the database using SESSION variables to save the connection information.
My goal is to use the "or die()" method to print something that will force a redirect because this could happen in a number of places in the site and I want to try and get them all in one swipe.
Here is what seemed like it would be the most promising:
$conn = mysql_connect($_SESSION['host'], $_SESSION['username'], $_SESSION['password']) or die("<script>location.href= '../login.php'</script>");
Unfortunately the javascript never runs.... I tried putting alerts also and nothing, but with firebug I can see they are printed.
how I can ensure that the javascript is executed?
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Feb 27, 2007
I'm testing a web site in a local directory by opening index.html from the File/Open File... menu of Firefox. When I use xHttpRequest.send() to retrieve a file to include in my page, the callback's status argument is 8 and req.status is 0. I suppose that the 8 is correct in that the req.status isn't 200 but it seems that for file:// (as opposed to http://) that req.status == 0 might be treated as success. I haven't tested far enough yet to know what req.status would be if the file I tried to retrieve was missing.
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Apr 26, 2010
I tried to create a function to reduce some in line code. However something is wrong with the function call getGenderChoice() because the code stops working. If I comment out getGenderChoice() and uncomment the lines that would be in the function it works properly. What would possibly be wrong with a function call that seems to follow function rules?
PHP Code:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>Main</title>
[Code].....
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Apr 21, 2011
Simple enough. This beautiful plugin is what I"m using:[URL]..The problem is, it has no documentation on how to detect a post failure. I know these are rare, but I'd like to code defensively.
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Jul 16, 2009
First, I have to say the jquery form is just perfect and fills very well a common issue for those who need to work with ajax. I would like to know, or even sugest a new feature if it is the case: how can we get, on client side and after an 'ajaxSubmit' call, the error code produced on server side? Is it possible to include such function on jquery form? Because we already have a 'success' callback functionality, how about a 'failure' one?
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May 31, 2009
Can anyone help me figure what kind of criteria I should use to search this forum for a clue as to my dilema?
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Feb 2, 2010
I made a very, very small project with a simple form one input field (in fact it is not used) one image (clickable) one button
<input type="text" id="setNom" value="admin"/>
<input type="image" id="validNom1"
src="ok-16.png" alt="valider" title="valider"' />
<input type="button" id="validNom2" value="OK" />
[Code]...
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Sep 6, 2010
I want to hook into validation success/failure events, but don't see an API to do this?
i.e. I want to enable/disable a particular set of controls depending on the state of validation.
Is there a way to do this? Am I missing something?
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May 20, 2011
I am returning the following to $getJSON() and not getting any results:
{"QC":["x","y","z"],"RM":[{"DEFAULT":"default_project1"},{"DEFAULT2":"default_project2"},{"DEFAULT":"default_project3"}]}
In the "RM" array there are three objects, each a single name/value pair. The name of the array[0] object ("DEFAULT") is identical to the name of the array[2] object. No results are returned by the getJSON call. Since each object is a separate array value, there shouldn't be any object name collision problems. Note that if I change the name of the array[2] object to "DEFAULT3", the data structure is handled properly.
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Aug 31, 2009
I'm trying to figure out how to integrate jQuery Validation plugin with the qTip plugin [0] to show custom error message displays. I've
had partial success with the following code:
$("#RegistrationForm").validate(
{
errorElement: "span",[code]....
At this point, that successfully displays the validation failure message in a qTip tooltip when it occurs, but there are two problems
with it:
1) The error tooltip toggles between visible and invisible onmouseover and onmouseout. I'm sure this isn't really an issue with the Validation plugin, but rather something I need to figure out with the tooltip plugin. But, my bigger problem is...
2) Even when the invalid condition is fixed (valid data is later entered into the field), the error tooltip remains attached to the field that was previously invalid, even after the field is valid, and continues to toggle between visible and invisible onmouseover and
onmouseout. I'm fairly certain that this is because I've not yet destroyed the tooltip object, but, I can't seem to figure out a way to intercept the "valid" or "success" event with a reference to the element so that I *can* destroy the attached tooltip object.any experience with combining qTip with Validation, or, if I'm missing something in the docs (I've not been able to find anything like this yet) about how to handle/override event handlers for individual form element invalidation/success. I *did* try attaching a function to the "success" attribute of the validate function, but that seems to only give me a reference to the success label, and not the element that its attached to.
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