Nested Objects :: Reuse Some Code In A Different Context To Do A Different Job?
Apr 29, 2011
I'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:
function d (e, f) {
this.e = e;
this.f = f;
}
[code]....
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?
I am having trouble with a recursive function I created to list out the indexes and values of various nested objects. 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: 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(" "); }} printObj(macros);
I'm writing examples for placing standards-compliant java applets in XHTML or HTML documents. And I'm also testing with Javascript. At some point, I created two 'object' elements, each with their 'param' children. Code:
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()
I have the following object: var wDefaults = { "skin":1, "pagewidth":"960px", "c1col":[ {"wid":"w001","pcol":0,"wpos":0,"wclosed":"false","wcollapsed":"true"} ], "c3col":[ {"wid":"w002","pcol":0,"wpos":0,"wclosed":"false","wcollapsed":"false"}, {"wid":"w003","pcol":0,"wpos":1,"wclosed":"false","wcollapsed":"false"}, {"wid":"w004","pcol":0,"wpos":2,"wclosed":"false","wcollapsed":"false"}, {"wid":"w005","pcol":1,"wpos":0,"wclosed":"false","wcollapsed":"false"}, {"wid":"w006","pcol":1,"wpos":1,"wclosed":"false","wcollapsed":"false"}, {"wid":"w007","pcol":1,"wpos":2,"wclosed":"false","wcollapsed":"false"}, {"wid":"w008","pcol":1,"wpos":3,"wclosed":"false","wcollapsed":"false"}, {"wid":"w009","pcol":2,"wpos":0,"wclosed":"false","wcollapsed":"false"}, {"wid":"w010","pcol":2,"wpos":1,"wclosed":"false","wcollapsed":"false"}, {"wid":"w011","pcol":2,"wpos":2,"wclosed":"false","wcollapsed":"false"} ]}
First, how do I access a single value? I've tried some of the examples I saw on the forum, but nothing happened. The alert did not fire: alert(wDefaults.c3col[0].wid); //first try alert(wDefaults.c3col.0.wid); //second try var obj = wDefaults.c3col[0]; //third try alert(obj.wid);
The nested objects are the properties for widgets within a portal. After the user moves around the widgets, I need to update the object, putting the widgets in a different order within c3col and updating the values saved in pcol, wpos, wclosed, & wcollapsed. I also may need to add or delete an object, for example, delete wid=w003 and add a new one called w012.
My logic would be: for each widget on the page found = false find the object in c3col where wid == x and update its other values . set found = true if found == false then add a new object to c3col with x & its properties end for for each object in c3col if that wid isn't found in the list of widgets on the page, delete it from c3col end for sort the objects under c3col by pcol and then wpos
The red parts are the ones I'm unclear about how to do it. My basic questions are: (1) How do you access a single nested object? (an object within c3col, find and change its values) (2) How do you add a new nested object to an existing object? (add a new object to c3col) (3) How do you delete an nested object? (remove an object from c3col) (4) How do you sort nested objects? (sort the objects in c3col by pcol and wpos)
I have some carousel code that I include on a page that has one carousel. Well, now we need to have two carousels with different content. So, instead of me having to recreate dbl data, I am curious how I can retrofit my current code to that I can objectify it for reusability.
I am trying to reuse a popup in my application. The reused popup also opens another popup. From this final popup I then try and reference a function located in the window that origionally opened the reused popup. This works fine in IE but doesn't in FireFox. Looking at the code through the Javascript debugger in FireFox it tells me that the reused popup's opener is closed even though it is still open. Is this a bug with FireFox or just bad practice?
I want to use the datepicker for multiple fields in a form however I don't know how to have it re-use the settings for multiple fields. For example, I have a form with 4 different fields for dates. I want to use the same datepicker formatting for each field. So instead of having to do something like this
I'm used to building objects in Visual Basic and I'm having difficulty simplifying this code into an object so I can just define and run about a dozen of them.
The code creates a button which changes on mouseover and on mouseclick. The button is a link to another page.
Also on mouseover the button slides to the right, giving a more intelligent feel for the user.
What are my options for streamlining this code so I can reduce the number of lines of code-clutter?
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.
I am building an sftp application. It has requirements to upload and download. To upload, a target folder that exists on the server needs to be set. I have a jQuery folder tree that dynamically creates a tree view of a directory on the server. Currently in Firefox, Opera, and Chrome if someone clicks on a branch of the tree on the afterClick event I am able to get the target path by using the DOM via node.context.nextElementSibling.value; The code for the afterClick is:
I know how to disable the context menu (the right hand mouse button) and how to replace it by my own menu. I also know that not everybody likes this - so let's not discuss about that here.
What I can't figure out and what I would like to know, is: 1) How to ADD elements to it, i.e. keep the original contents and add something to it; 2) How to RESTORE it to its original contents.
Does anyone know the code for a simple working example of these things?
I'm making a web application which is a copy of existing desktop application. I use telerik controlls for MS visual studio I have a little bit complicated situation beacuse I need context menus but the main problem is that they have to be downloaded from server after the page loads. I can't load all of them on page because there are to many.
This is my solution of the problem. When user right-clicks js download from server through XMLHttpRequest some data from serwer and make menu from them. But it needs much work to make the menu look nice, now I just have one level menu.
I've been looking for some controlls that can do the things I need but with no result.
I am running my website using Weblogic, so the path is something like http://<myip>:<port>/<servername>/
On JSP pages I can use <%=request.getContextPath()%to get the root path of the site, ie that specified above. How can I get the same using Javascript?
For example, something like <a href='/home'>..</awill not work as that would point to http://<myip>:<port>/home and needs to point to http://<myip>:<port>/<servername>/home
I am creating html pages with forms where I use Dynarch menu script in a context menu mode. Their script needs to be initialized like this: <body onload="DynarchMenu.setup('menu', { context: true });">
This is in the beginning of the html page. But, in my webpages I have only few pages where I actually use this kind of menu. Since I use smarty template engine, I have single html-header file for all pages - it includes the same <html><head><bodyetc. for each page. So I tried to initialize this dynarch script only within the page that actually uses this menu. I do it like this:
<form>[...]</form> <ul id="menu"> [context menu elements definition here] </ul>
This thing works OK in Firefox, however when I load such page in IE6 it aborts the operation without even showing the page, and the popup message says:
"Internet Explorer cannot open the Internet site http://example.com. Operation aborted."
Does anyone know a way how to initialize the DynarchMenu.setup not from the <bodyelement but from anywhere else in the html page?
I am writing a javascript code that parses dom and finds event handlers attached to mouseover events. Then i will replace the existing handler say B() with my own function say A(). When the event happen and control comes to my function A(), after doing required processing i will call B() as shown below
<a href = "abc.com" mouseover = "B();"link </a>
while parsing i will have (trimmed down version)
var oldHandler = node.onmouseover; node.
function A() { / * my code */ oldHandler.call(this); }
This was working fine as long as B() was a global function. I started getting problems when B was a member function. For eg:
function Alerter(text) { this.text=text; var me=this; this.invoke=function () { alert(this.text); } } var sayHi = new Alerter('Hello, world!');
The web developer would have code like <a href = "abc.com" mouseover = "sayHi.invoke()"link </a>
But this time around, my function A() fails since although i have handler to sayHi.invoke(), it has to be executed in correct context. Other wise "this.text" is giving me error because when i say oldHandler.call(this), i am executing the sayHi.invoke() with the html element being passed as this.
I have a problem with YUI context menu. I want the menu to show different links (with product_id) in every row. I have been struggling with this for days no without result.My code is as follow:
As you can see table row takes menu items according to id (type1, type2 etc).But as my table is created from mysql database dynamically, it does'n work that way.
I am trying to get context path of my Applcation. But it is showing errors in that. Can you please mention the way how to get context path in javascript functions.
I am displaying my own context menu in response to a right-click on control (textbox) in my ASP.NET application. In IE, I can suppress the display of the browser's own context menu by simply returning false from the javascript that displays my context menu.How can I suppress the browser context menus from Chrome or Firefox?
