I'm trying to inherit from built-in JS objects - Array, specifically.
However, I'm having some difficulties. I can add array elements to
the child object, and when I retrieve them, they're the same as what I
added. The problem is, the 'length' property remains zero no matter
how many elements the child contains: Code:
Have you ever wondered what functions were included in javascript? Have you ever wondered what properties and methods each javascript object supported? You can use this script to display a complete list of all javascript objects supported by your browser. The type of the object will appear in bold. As long as the type is not listed as 'undefined' you can click on that object to view all the supported methods and properties. The back and forward buttons will not work with this script due to security precautions that are built into Firefox. However, I have provided links at the top of each page to help you navigate back and forward between pages.
Usage:
Download the attachment to this post and extract the getObjects.js file. Then add the following code to your webpage.
<script type="text/javascript" src="getObjects.js"></script>
//call the function by using the following link
<a href="javascript:getObjects('window');">Show Objects</a>
//you can substitute the window object with any object of your choice
<a href="javascript:getObjects('window.Components.interfaces');">Show Objects</a>
I have been looking at Prototype.js quite a bit lately as I need to
create a very small library of similar functionality to a subset of
Prototype.js. This is for use with Ruby on Rails.
About Prototype.js Rob G wrote:
1. It modifies the protoype of some built-in objects so that
using say, for..in with an array object produces unexpected
results.
I can see that modifying the prototypes of Object or Array could break
other JavaScript libraries that depend on for..in. Prototype.js also
adds functions to the prototype of Element. How bad is that? (I notice
that in Flanagan's JavaScript 4th edition he mentions that you can
modify the prototypes of built in objects however there is no mention
of the dangers involved.)
I then thought I could use an instance of Element as the prototype of a
MyElement constructor but that option has been squashed in the past as
being not cross browser.
Assuming I shouldn't be playing with the prototypes of built-in
JavaScript objects I can see a couple options that might still be
available. Code:
My text that overflows is visible but it does not have the div's background color. How do I get it to keep the background color?
View 1 Replies View RelatedI'm using something along the lines of...
Code:
//next we need to create a row
workingTR = workingTable.insertRow(position+i);
// then I use setAttribute to set the class
[Code]....
the row (tr) is being assigned the class of employee-detail, and I've confirmed this by looking throught the dom explorer. however, it's NOT inherting the CSS formating that is located in a external file .css. I hard coded in a row with the same class 'employee-detail' and it inherited the css formatting.
I'm wondering why my javascript created row is not inheriting the css class formatting.
Code:
.employee-detail {
font-size:10px;
font-weight:bold;
}
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.
View 1 Replies View RelatedI decided when redesigning my website that i would try and build nearly everything in it by hand, which included a nice Javascript slideshow.While coding it (coded on Windows 7 and Vista) I ensured i checked it compatability with Firefox, IE, Chrome and Safari. From what i could tell everything was working good (except for some endless looping problems but lets ignore that for now). It even worked on the iPhone browser.
But i sent it to a friend to test and they said nothing was working, after some discussion i descovered they were using IE7 (i was testing in IE8).From what i can see, IE7 has some problems with nested .appendChild and general document handling. I had tried to do my best keeping to using objects in javascript and now just writing HTML, and on one side it worked as it works on most browsers, but not IE7.
The code is nearly all based in a class, but i kept finding problems so there are a few functions found outside the class.The area where most things go wrong is in the function:
this.goToImage = function (image) {
As this is used to generate the floating div above all the content. This function also uses IMG objects which are hidden until the image has loaded (instead showing a nice please wait logo) and then once loaded it appears. I have tried using .innerHTML to get around the append child problems but the images dont seem to work the same as just passing object around.
I am building iframes from database entries. Is it possible to resize them with an onclick event?
View 1 Replies View RelatedI am trying to add a link to an existing nav menu built in javascript. I need this link to open in a new window, but I cannot get it to work
View 4 Replies View RelatedI'm building the "Contact Us" section of my .mobi site (xhtml and
html).Is there any way to create an e-mail form that use the mini-browser
built-in mailer? (Perhaps a javascript code to add ?)
To build a horizontal floating menu that matches the first row (header row) of my dynamically built table (to include text and cell height/width - needs to match exactly). I have accomplished 90% of this task by extracting the text and building the row in my floating menu header and placing the floating menu where it needs to be. However, I'm having a problem aligning the table (<TD></TD>) cells because of my dynamically built table.
Scenario:
I have a table that is built dynamically. Before it is displayed, I format the table row data (code that adds text/deletes rows etc…), which alters the width of all the table cells (via JavaScript). We'll call this (for lack of a better phrase) "pre_floater_table_format_code."
I then loop through the DOM (<TD></TD>) in the first row of the table to get the text and width from each cell (using offsetWidth and/or clientWidth) and assign the text and cell width(s) to variables that I use to build my floating menu with. We'll call this (for lack of a better phrase) "get_cell_text_width_code."
Problem:
The problem is that once the table is built (and before it is altered by the "pre_floater_table_format_code") it seems as though my "get_cell_text_width_code" reads the un-processed table cell width(s) and sets these variables to the un-processed width values. The "pre_floater_table_format_code" runs much earlier than the "get_cell_text_width_code." So why wouldn't the "get_cell_text_width_code" read the cell width(s) after they've been adjusted by the "pre_floater_table_format_code?" Does this make sense? Anyone have any recommendations? Alternative solutions?
i'm trying to do is have a textbox which some types 'hello world' into (or whatever), a script that takes that input and splits it into an array of individual letters, finds the appropriate graphic version of each letter and spits it out on the screen. so far i have Code:
View 1 Replies View RelatedIs there a better way to extend object with internal objects?
$.fn.bestShow = function(s) {
var d = {
width: 0,
height: 0,
order: "numeric",
orderBy: "",
[Code]...
I am having difficulty with the isNaN built-in function. Here is the code that I have written, with the event handler onchange, the function does not return the desired response.
CODE:
Here is an example of the event handler code...one of three calls to this specific function...
<input type="text" name="zip_billing" size="5" maxlength="5" onchange=" return checkNumber(this.value);" />
I need to attach a javascript function I wrote to the onChange event of
a <select> tag. However, I'm using a 3rd party tool that creates the
html files - it only lets me add bits of html to it, I can't touch the
elements it produces, so I can't just add an onChange="myfunction"
attribute to that <select> tag. I can't change the onload attribute of
the <body> tag.
How can I run code that attached my function to that event?
I have built search form that it retrieves information from database. for ex: when i click axtar (search) button it retrieves normally but when i click ENTER button via keyboard instead of axtar (search) button but it only displays results with white blank page
Here is web page address. [url]
I'm using jquery/ajax to create some links with window.open method. Here's the relevant code:
$("#content").empty();
$.ajax({
type: "GET",[code]..........
Basically, when you click a link a function is called with a parameter based on the particular link you run. Then the code runs through an xml file, and if the parent of the nodes I've cyling through has a value equal to the parameter past to the function, that node is used to create a new link with window.open function attached to it.It all works, or seems to, and when I alert what is being built, it looks right to me, yet the links don't work.I've attached a copy of one of the alerts of one of the links as it's built.
Can assign a new function to a built-in object in Firefox:
But IE and Opera don't have a MouseEvent or HTMLElement that can be set up in the same way. Can you do this in IE or Opera, or just Firefox, and maybe Webkit?
Is there any way at all to create a new template object that inherits from the built in Date object so as to be able to add new methods to that child object without adding them to the built in Date object? I've tried everything I can think of and as far as I can tell it keeps referencing the Date function instead of the Date object and so doesn't work.
View 3 Replies View RelatedI 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:
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?
Where is the list of js objects (Anchor, Applet, document, etc)? It's not in the Netscape Guide or Core documents.
View 2 Replies View RelatedIf 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.
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.
"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?
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?