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javascript Programming Glossary: considerhttp://stackoverflow.com/questions/1047454/what-is-lexical-scope can not deduce the outer dynamic scope of a function consider our last example if we write something like this if some condition..
How does “this” keyword work within a JavaScript object literal? http://stackoverflow.com/questions/133973/how-does-this-keyword-work-within-a-javascript-object-literal be what's tripping you up but don't feel bad. Many people consider this a bad design decision. Since a callback is invoked as a..
In jQuery, how to attach events to dynamic html elements? http://stackoverflow.com/questions/1359018/in-jquery-how-to-attach-events-to-dynamic-html-elements myclass href # test3 a That works with no problem. However consider if the myclass elements were written to the page at some future..
Cross-browser onload event and the Back button http://stackoverflow.com/questions/158319/cross-browser-onload-event-and-the-back-button articles or my summary in a separate answer below and consider whether you really need to do this and make your page load slower..
How to “properly” create a custom object in JavaScript? http://stackoverflow.com/questions/1595611/how-to-properly-create-a-custom-object-in-javascript classes. There are a few refinements and extensions we can consider under this model. For example here is a syntactical sugar version.. r ... There are a lot of potential features you might consider desirable in an object system and no one really agrees on one..
Validate numbers in JavaScript - IsNumeric() http://stackoverflow.com/questions/18082/validate-numbers-in-javascript-isnumeric it could be a String containing a numeric value I had to consider also exponential notation etc. a Number object virtually anything.. care of type coercion eg. true 1 but true shouldn't be considered as numeric . I think is worth sharing this set of 30 unit..
Change an element's CSS class with JavaScript http://stackoverflow.com/questions/195951/change-an-elements-css-class-with-javascript not think of when writing your code. Whilst some people consider it overkill to add a ~50KB framework for simply changing a class.. have unusual cross browser behaviour it is well worth considering. Very roughly a library is a set of tools designed for a..
Does it matter which equals operator (== vs ===) I use in JavaScript comparisons? http://stackoverflow.com/questions/359494/does-it-matter-which-equals-operator-vs-i-use-in-javascript-comparisons conversion is done and the types must be the same to be considered equal. Reference Javascript Tutorial Comparison Operators.. literal due to its toString or valueOf method. For example consider the comparison of a string literal with a string object created..
Safely turning a JSON string into an object http://stackoverflow.com/questions/45015/safely-turning-a-json-string-into-an-object different ones for Javascript. I believe most people would consider json2.js their goto implementation. share improve this answer..
Why is using “for…in” with array iteration such a bad idea? http://stackoverflow.com/questions/500504/why-is-using-for-in-with-array-iteration-such-a-bad-idea only the explicitly set index of 5 and ignores 0 4 Also consider that JavaScript libraries might do things like this which will..
How to remove the space between inline-block elements? http://stackoverflow.com/questions/5078239/how-to-remove-the-space-between-inline-block-elements the pragmatic solution. You do sometimes have to carefully consider where whitespace will come from. Will appending another element..
When does reflow happen in a DOM environment? http://stackoverflow.com/questions/510213/when-does-reflow-happen-in-a-dom-environment If these measurements are taken repeatedly you should consider taking them just once and storing the result which can then..
Is JavaScript a pass-by-reference or pass-by-value language? http://stackoverflow.com/questions/518000/is-javascript-a-pass-by-reference-or-pass-by-value-language because they can be both passed by value in case we consider that a variable holding an object is in fact a reference to.. a reference to the object and passed by reference when we consider that the variable to the object holds the object itself . Although..
Where do you include the jQuery library from? Google JSAPI? CDN? http://stackoverflow.com/questions/547384/where-do-you-include-the-jquery-library-from-google-jsapi-cdn Google API's however if that ever changed then I would consider it... First The Google api servers are distributed across the..
http://stackoverflow.com/questions/5874652/prop-vs-attr of how properties are simpler to deal with than attributes consider a checkbox that is initially checked. Here are two possible..
Is JavaScript's Floating-Point Math Broken? http://stackoverflow.com/questions/588004/is-javascripts-floating-point-math-broken
Cross-browser window resize event - JavaScript / jQuery http://stackoverflow.com/questions/599288/cross-browser-window-resize-event-javascript-jquery do something For the sake of UI responsiveness you might consider using a setTimeout to call your code only after some number..
JavaScript inheritance and the constructor property http://stackoverflow.com/questions/8093057/javascript-inheritance-and-the-constructor-property is the best way to update the constructor Further please consider the following. console.log new a instanceof a true console.log..
Why does jQuery or a DOM method such as `getElementById` not find the element? http://stackoverflow.com/questions/14028959/why-does-jquery-or-a-dom-method-such-as-getelementbyid-not-find-the-element before that DOM element appears in the HTML will fail. Consider the following example script var element document.getElementById..
javascript closure immediate evaluation http://stackoverflow.com/questions/1413916/javascript-closure-immediate-evaluation closure immediate evaluation Consider the following Javascript code var a var f function for var i..
JavaScript: Class.method vs. Class.prototype.method http://stackoverflow.com/questions/1635116/javascript-class-method-vs-class-prototype-method refer to the actual object instance where you call it. Consider this example constructor function function MyClass var privateVariable..
Check if Internet Connection Exists with Javascript? http://stackoverflow.com/questions/2384167/check-if-internet-connection-exists-with-javascript isn't that bad of a method for testing your connectivity. Consider one of the other answers state that there are too many points.. seems to be some confusion around what being online means. Consider that the internet is a bunch of networks however sometimes you're..
Javascript regex hangs (using v8) http://stackoverflow.com/questions/2407870/javascript-regex-hangs-using-v8 of spaces that occur after the last closing tag main tag. Consider the case where the subject string ends with 100 spaces. First..
Precise Financial Calculation in JavaScript. What Are the Gotchas? http://stackoverflow.com/questions/2876536/precise-financial-calculation-in-javascript-what-are-the-gotchas to handle money as 2550 cents instead of 25.50 dollars. Consider that in JavaScript var result 1.0 2.0 result 3.0 returns true..
How to check for “undefined” in JavaScript? http://stackoverflow.com/questions/3390396/how-to-check-for-undefined-in-javascript value then using the in operator is the safest way to go. Consider this example. global scope var theFu theFu has been declared..
Google Maps v3 - limit viewable area and zoom level http://stackoverflow.com/questions/3818016/google-maps-v3-limit-viewable-area-and-zoom-level the bounds. You can also limit the zoom level very easily. Consider the following example DOCTYPE html html head meta http equiv..
How to stop event propagation with inline onclick attribute? http://stackoverflow.com/questions/387736/how-to-stop-event-propagation-with-inline-onclick-attribute to stop event propagation with inline onclick attribute Consider the following div onclick alert 'you clicked the header' class..
Understanding the difference between Object.create() and new SomeFunction() in JavaScript http://stackoverflow.com/questions/4166616/understanding-the-difference-between-object-create-and-new-somefunction-in-j ' and when you would want to use one over the other. Consider the following example var test val 1 func function return this.val..
Is eval() and new Function() the same thing? http://stackoverflow.com/questions/4599857/is-eval-and-new-function-the-same-thing local variables because the code runs in a separate scope. Consider this code function test1 var a 11 eval ' a 22 ' alert a alerts..
Should setting an image src to data URL be available immediately? http://stackoverflow.com/questions/4776670/should-setting-an-image-src-to-data-url-be-available-immediately setting an image src to data URL be available immediately Consider the following fragile JavaScript code var img new Image img.src..
Is JavaScript a pass-by-reference or pass-by-value language? http://stackoverflow.com/questions/518000/is-javascript-a-pass-by-reference-or-pass-by-value-language question As Shog9 says it's interesting in Javascript. Consider this example function changeStuff num obj1 obj2 num num 10 obj1.item..
Should the id of elements be made global variables? And http://stackoverflow.com/questions/6381425/should-the-id-of-elements-be-made-global-variables-and for application code is generally considered bad behavior. Consider referencing element IDs using document.getElementById or jQuery..
JavaScript inheritance and the constructor property http://stackoverflow.com/questions/8093057/javascript-inheritance-and-the-constructor-property inheritance and the constructor property Consider the following code. function a function b function c b.prototype..
Why does javascript object show different values in console in Chrome, Firefox, Safari? [duplicate] http://stackoverflow.com/questions/8249136/why-does-javascript-object-show-different-values-in-console-in-chrome-firefox Chrome's JavaScript console lazy about evaluating arrays Consider this javascript var foo bar 1111 console.log foo console.log..
(1,eval)('this') vs eval('this') in JavaScript? http://stackoverflow.com/questions/9107240/1-evalthis-vs-evalthis-in-javascript always . A direct eval executes from the current scope. Consider the following code var x 'outer' function var x 'inner' eval..
Immediate function invocation syntax http://stackoverflow.com/questions/939386/immediate-function-invocation-syntax between function values and the values of functions. Consider the case where the result of immediate invocation is the right..
How to get the value from URL Parameter? http://stackoverflow.com/questions/979975/how-to-get-the-value-from-url-parameter to get the value from URL Parameter Just Consider I am having the URL with parameter as follows www.test.com t.html..
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