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• Detect when a new property is added to a Javascript object?

  - by UICodes

  A simple example using a built-in javascript object: navigator.my_new_property = "some value"; //can we detect that this new property was added? I don't want to constantly poll the object to check for new properties. Is there some type of higher level setter for objects instead of explicitly stating the property to monitor? Again, I don't want to detect if the property value changed, but rather when a new property is added. Ideas? thanks

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• How to pass a parameter to a javascript through a url and display it on a page ?

  - by Frank

  For instance, I have a url like this : www.mysite.com/my_app.html How do I pass a value " Use_Id = abc " to it and use javascript to display on that page ?

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• How do I transfer a javascript value to a php variable?

  - by motboys

  I have an html table containing values that are being generated from javascript. How do I transfer those values to php variables?

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• Ruby equivalent to JavaScript’s encodeURIComponent that produces identical output?

  - by Mo

  Hi is there an equivalent ruby method to JavaScript encodeURIComponent method? i am using the URI.unescape(str) but it recognizes the "£" (after encodeURIComponent it becomes "%C2%A3") as a "?" sign. any solution's? thanks

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• How to know without having iphone and ipad, any javascript/jquery effect/plugin will work on those?

  - by metal-gear-solid

  How to know without having iphone and ipad, any javascript/jquery effect/plugin which is working fine on all desktop browsers, will work on iphone and ipad also? Is it enough to check on Latest Safari for Windows? I don't have MAC OSX .My os is Windows.

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• Javascript array best practice to use [] instead of new array?

  - by AlfaTeK

  I read at many tutorials that the current best practices to create a new javascript array is to use "var arr = []" instead of "var arr = new Array()". What's the reasoning behind that?

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• How do I make a word bold in javascript?

  - by user54197

  I am using javascript to populate data in a table which return everything fine. I would like to make a string bold. See code below $tr.find('.data').val($('#txtName').val() + ' <strong>Address:<\/strong> ' + $('#txtAddress').val()); How do I make only the word "Address" bold?

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• Is there a Javascript cron implementation somewhere that I'm missing?

  - by user173491

  I'm aware of timing issues in Javascript, how its not exact/off by milliseconds etc, but I need something to at least attempt to do browser-based scheduling. In terms of features, I'm thinking something along the lines of scheduling patterns described here: http://www.sauronsoftware.it/projects/cron4j/manual.php#p02 Anything out there? I've done google searches and haven't found any implementation worth nothing.

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• How do I do a Date comparison in Javascript?

  - by Lulu Ket

  I would like to compare two dates in javascript. I have been doing some research, but all I can find is how to return the current date. I want to compare 2 separate dates, not related to today. How do I do that. var startDate = Date(document.form1.Textbox2);

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• Dynamic Object Initialization In JavaScript (just like PHP Reflection allows)?

  - by Gcoop

  Hi All, Using Reflection in PHP I can dynamically create a object like so $target = 'core_domain_Person'; $reflect = new ReflectionClass($target); $obj = $reflect->newInstance(); I would like to replicate this same concept in JavaScript is there a way to do this out of the box? Or is there a way to replicate what Reflection is doing?

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• How to get the domain value for a cookie in Javascript?

  - by Wabbitseason

  Using Javascript I'd like to get the domain value for a specific cookie. Is this possible? If so, how? To clarify: I'm not looking for the value of the cookie. I'm on "subdomain.domain.com" and I need to remove a cookie whose name is known but its domain value is something like ".domain.com". In short: I'd like to get the value of ".domain.com".

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• JavaScript - Is it possible to get height from div in separate div?

  - by Kenny Bones

  Hi, I'm wondering, is it possible to collect the height of a specific div container from a separate page with JavaScript? I'm using jQuery btw and I'm in need of comparing heights of div containers.

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• How to turn a string into a date in Javascript.

  - by Kyle

  How could I turn this string Sun Apr 25, 2010 3:30pm Into a valid Date in JavaScript (Minimal code is what I'm aiming for here)?

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• Detect if parameter passed is an array? Javascript.

  - by Alex

  Hello all, I have a simple question: How do I detect if a parameter passed to my javascript function is an array? I don't believe that I can test: if (typeof paramThatCouldBeArray == 'array') So is it possible? How would I do it? Thanks in advance.

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• How can I use client-side JavaScript to restrict the size of file uploads?

  - by cometta

  Is there a JavaScript library that can be used to check the size of a file before allowing it to be uploaded to a Java servlet?

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• How to use Javascript to popup a new window with NEARLY the same html as its parent window

  - by Ethan

  I want to create multiple versions of print-friendly pages from a single page. I am considering to do it in this way: placing several buttons on the original page and, clicking one button will popup a new window with the same html as its parent window, but with some modifications (e.g., set display attribute of some DIV's to none). It is possible to use javascript to do this?

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• Is possible to initialize an object in javascript in this way?

  - by Kucebe

  I'd like to initialize an object in javascript calling directly a method that belongs to it: var obj = (function(){ return{ init: function(){ console.log("initialized!"); }, uninit: function(x){ console.log("uninitialized!"); } }; }).init(); //later obj.uninit(); obj.init(); This specific example doesn't work, is there something similar?

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• How to distinguish between blank areas and non-blank areas in a webpage with JavaScript?

  - by Ethan

  How to distinguish between blank areas and non-blank areas in a webpage with JavaScript? Blank areas including: areas that are not occupied by DOM elements. margins, borders and paddings of DOM elements.

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• in javascript how to send request some url at a partcular time(e.g daily 5 pm)

  - by dpaksp

  in javascript how to send request some url at a partcular time(e.g daily 5 pm)......... very day @5pm i have to send some request (url)e.g sending emails how to do in java script

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• JavaScript: How do I create an Array into another Array?

  - by Timnkd

  I have the following JavaScript Array: var jsonArray = { 'homes' : [ { "home_id":"203", "price":"925", "sqft":"1100", "num_of_beds":"2", "num_of_baths":"2.0", }, { "home_id":"59", "price":"1425", "sqft":"1900", "num_of_beds":"4", "num_of_baths":"2.5", }, // ... (more homes) ... ]} I want to convert this in an Array like such (pseudo code): var newArray = new Array(); newArray.push(home_id's); How can I do that? Notice how the newArray only has home_ids from the big jsonArray array.

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• What are the standard practices for throwing Javascript Exceptions?

  - by T.R.

  w3schools says that exceptions can be strings, integers, booleans, or objects, but the example given doesn't strike me as good practice, since exception type checking is done through string comparison. Is this the preferred method of exception handling in Javascript? Are there built-in exception types (like NullPointerException)? (if so, what are they, what kind of inheritance do they use, and are they preferred over other options?)

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• Is there a way to stop all javascript on the page?

  - by M28

  I need to stop all the javascript running on the page, but I have a limitation: I cannot control the tags content, I am editing the page after it's being loaded. Also, I need to remove all the variables defined by the old script that was running and stop all the intervals.

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• How to generate a unique key for a url with javascript?

  - by user198729

  Just like digg,but do they generate such a key ? What's the best practice to do this kinda job with javascript?

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• How do I add a new key:value pair in existing JavaScript object?

  - by basit74

  I have a JavaScript object like: appointerment= {ids: '15,16,17', appointments: {'15': '12.05.2010,14,05,2010'} } now in appointments object I want to add something like '16': '21.05.2010' what is the best possible way to do this?

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• How can I get the value from a parent html page into a javascript popup page?

  - by Jim

  I have a php page where a date value is POSTed back to. From this php script, I want to forward that value to a javascript window. Can this be done?

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