javascript Programming Glossary: asHow do JavaScript closures work? http://stackoverflow.com/questions/111102/how-do-javascript-closures-work example given in Stack Overflow and it did not help. javascript closures share improve this question Whenever you see.. keyword within another function the inner function has access to variables in the outer function. function foo x var.. will always alert 16 because bar can access the x which was defined as an argument to foo and it can also access tmp from..
Access / process (nested) objects, arrays or JSON http://stackoverflow.com/questions/11922383/access-process-nested-objects-arrays-or-json could I access the name of the second item in items javascript arrays object recursion share improve this question .. a key value structure. Keys in arrays must be numeric whereas any string can be used as key in objects. The key value pairs.. in arrays must be numeric whereas any string can be used as key in objects. The key value pairs are also called the properties..
event.preventDefault() vs. return false http://stackoverflow.com/questions/1357118/event-preventdefault-vs-return-false use jQuery in the examples but this applies to plain JS as well # 1 event.preventDefault 'a' .click function e custom handling.. With the method you have to remember about correct casing parenthesis etc. Also I have to define the first parameter.. to be able to call the method. Perhaps there are some reasons why I should avoid doing it like this and use preventDefault..
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 Any performance improvement would probably be welcomed as there are hundreds if not thousands of these comparison operators.. being used throughout the file. Would I be correct in assuming that if no type conversion takes place there would be.. a small probably extremely small performance gain over javascript operators equality equality operator identity operator..
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 not to use for...in with arrays in JavaScript. Why not javascript arrays for loop share improve this question The reason.. arrays for loop share improve this question The reason is that one construct... var a a 5 5 Perfectly legal JavaScript.. i 0 i a.length i Iterates over numeric indexes from 0 to 5 as everyone expects. can sometimes be totally different from the..
http://stackoverflow.com/questions/5874652/prop-vs-attr vs .attr So jQuery 1.6 has the new function prop . selector .click function instead of.. i use this .prop 'style' or this .attr 'style' or in this case do they do the same thing And if I do have to switch to using.. maniator JpUF2 The console logs the getAttribute as a string and the attr as a string but the prop as a CSSStyleDeclaration..
Is JavaScript's Floating-Point Math Broken? http://stackoverflow.com/questions/588004/is-javascripts-floating-point-math-broken 0.1 0.2 0.3 false 0.1 0.2 0.30000000000000004 Any ideas why this happens javascript math floating point floating accuracy.. 0.1 0.2 0.30000000000000004 Any ideas why this happens javascript math floating point floating accuracy fractions share.. question All floating point math is like this and is based on the IEEE 754 standard . JavaScript uses 64 bit floating..
Javascript closure inside loops - simple practical example http://stackoverflow.com/questions/750486/javascript-closure-inside-loops-simple-practical-example closure inside loops simple practical example Closures.. practical example Closures are one of those things which has been discussed a lot on SO but this situation pops up a lot.. see It outputs this My value 3 My value 3 My value 3 Whereas I'd like it to output My value 0 My value 1 My value 2 What's..
What is the difference between a function expression vs declaration in Javascript? [duplicate] http://stackoverflow.com/questions/1013385/what-is-the-difference-between-a-function-expression-vs-declaration-in-javascrip are loaded before any code can run. function foo return 5 As for the second part of your questions. var foo function foo..
How do JavaScript closures work? http://stackoverflow.com/questions/111102/how-do-javascript-closures-work tell me more Here the number x is a literal number. As with other literals in JavaScript when foo is called the number.. bar foo age bar is now a closure referencing age. bar 10 As expected each call to bar 10 will increment x.memb . What might..
Access / process (nested) objects, arrays or JSON http://stackoverflow.com/questions/11922383/access-process-nested-objects-arrays-or-json of the second item. Here is how we can do it step by step As we can see data is an object hence we can access its properties..
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 handler. In fact the jQuery tutorial explicitly states As almost everything we do when using jQuery reads or manipulates..
jQuery Mobile: document ready vs page events http://stackoverflow.com/questions/14468659/jquery-mobile-document-ready-vs-page-events listed in Page events transition order . Page Change Times As mentioned when you change from one JQuery Mobile page to another.. a persistent javascript object for a storage purpose. As long ajax is used for page loading and page is not reloaded.. prevPage object holds a complete previous page. Solution 4 As a last solution we have a nifty HTML implementation of localStorage...
Javascript infamous Loop problem? http://stackoverflow.com/questions/1451009/javascript-infamous-loop-problem link The above 2 snippets are quoted from here . As the author's explanation seems the closure makes the magic... num whose value is set to the current value of i . As num is never modified it will stay constant over the lifetime..
Elegant workaround for JavaScript floating point number problem http://stackoverflow.com/questions/1458633/elegant-workaround-for-javascript-floating-point-number-problem it should just print 0.02 if you use your calculator . As far as I understood this is due to errors in the floating point..
When is JavaScript's eval() not evil? http://stackoverflow.com/questions/197769/when-is-javascripts-eval-not-evil other than when manipulating JSON it is OK to use eval As several people have now pointed out it's not even necessary.. then code injection is a pretty minor risk I believe. As for performance you'll have to weight that against ease of coding...
http://stackoverflow.com/questions/2067472/what-is-jsonp-all-about returning something like this mycallback foo 'bar' As you can see it will now invoke the method you specified. So.. there is no nice way to get proper failure codes back. As a result you end up using timers to monitor the request etc..
Use of 'prototype' vs. 'this' in Javascript? http://stackoverflow.com/questions/310870/use-of-prototype-vs-this-in-javascript the object A is assigned a property x via the prototype. As you can see this is completely different from the effect in..
Abort Ajax requests using jQuery http://stackoverflow.com/questions/446594/abort-ajax-requests-using-jquery alert Data Saved msg kill the request xhr.abort UPDATE As of jQuery 1.5 the returned object is a wrapper for the native..
How to parse JSON in JavaScript http://stackoverflow.com/questions/4935632/how-to-parse-json-in-javascript browsers that don't you can implement it using json2.js . As noted in the comments if you're already using jQuery there is..
http://stackoverflow.com/questions/5874652/prop-vs-attr helpful. There's a section on element properties . As an example of how properties are simpler to deal with than attributes..
Why is using the JavaScript eval function a bad idea? http://stackoverflow.com/questions/86513/why-is-using-the-javascript-eval-function-a-bad-idea slowly no opportunity to compile cache eval'd code Edit As @Jeff Walden points out in comments #3 is less true today than..
How to associate each option button with their own individual marks? http://stackoverflow.com/questions/11199379/how-to-associate-each-option-button-with-their-own-individual-marks how you would loop it using a heredoc foreach _Questions AS question echo EOT div class queWrap id question question 'id'..
http://stackoverflow.com/questions/12428587/server-side-php-long-polling _SESSION 'id' result SELECT d. c. u. FROM streamdata AS d JOIN streamdata_comments AS c ON d.streamitem_id c.comment_streamitem.. d. c. u. FROM streamdata AS d JOIN streamdata_comments AS c ON d.streamitem_id c.comment_streamitem JOIN users AS u ON.. AS c ON d.streamitem_id c.comment_streamitem JOIN users AS u ON u.id c.comment_poster WHERE c.comment_poster ' following_string'..
http://stackoverflow.com/questions/1283158/geolocation-api AN North America AO Africa AQ Antarctica AR South America AS Australia AT Europe AU Australia AW North America AZ Asia BA..
How to manage client-side JavaScript dependencies? http://stackoverflow.com/questions/12893046/how-to-manage-client-side-javascript-dependencies package.json or bower's component.json. Different but AS GOOD I should have the flexibility to point to git repo or actual..
Understanding Eloquent Javascript's Reduce function http://stackoverflow.com/questions/13203511/understanding-eloquent-javascripts-reduce-function action for var i 0 i array.length i action array i READ AS base counter base array i action denotes a function that is..
Convert a mySQL date to Javascript date http://stackoverflow.com/questions/1765803/convert-a-mysql-date-to-javascript-date would be done by something like SELECT UNIX_TIMESTAMP date AS epoch_time FROM table Then get the epoch_time into JavaScript..
Scroll smoothly to specific element on page http://stackoverflow.com/questions/17722497/scroll-smoothly-to-specific-element-on-page portions of the Software. THE SOFTWARE IS PROVIDED AS IS WITHOUT WARRANTY OF ANY KIND EXPRESS OR IMPLIED INCLUDING..
http://stackoverflow.com/questions/18043125/plugin-illuminate-0-7-incompatible-to-jquery-1-9-1-or-jquery-ui-1-10-3-typeer IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS AS IS AND ANY EXPRESS OR IMPLIED WARRANTIES INCLUDING BUT NOT LIMITED..
How to detect linked PDF on a page and show message to download Adobe reader using jquery? http://stackoverflow.com/questions/1899913/how-to-detect-linked-pdf-on-a-page-and-show-message-to-download-adobe-reader-usi DIV WITH ID maincontent THEN THIS WILL PUT TIP PARAGRAPH AS LAST CHILD OF DIV if div#maincontent a href ' pdf' .length 0.. WITH ID maincontent THEN THIS WILL PUT TIP PARAGRAPH AS LAST CHILD OF DIV if div#maincontent a href ' pdf' .length 0 div#maincontent..
Flash based cropper like this, but with source or customizable? http://stackoverflow.com/questions/1974422/flash-based-cropper-like-this-but-with-source-or-customizable Cropping Component HOW TO CROP AND RESIZE AN IMAGE USED AS BACKGROUND FOR CANVAS Building an image viewing widget with.. HOW TO CROP AND RESIZE AN IMAGE USED AS BACKGROUND FOR CANVAS Building an image viewing widget with ActionScript 3.0 The first..
Javascript check Mouse clicked inside the Circle or Polygon http://stackoverflow.com/questions/2212604/javascript-check-mouse-clicked-inside-the-circle-or-polygon prior written permission. THE SOFTWARE IS PROVIDED AS IS WITHOUT WARRANTY OF ANY KIND EXPRESS OR IMPLIED INCLUDING..
get average color of image via javascript http://stackoverflow.com/questions/2541481/get-average-color-of-image-via-javascript hex or rgb value for an image. I know it can be done in AS but looking to do it in JavaScript. javascript image manipulation..
What's the best and easiest way to Populate a dropdown based on another dropdown http://stackoverflow.com/questions/3637972/whats-the-best-and-easiest-way-to-populate-a-dropdown-based-on-another-dropdown with data SQL Code querycourse SELECT course COUNT course AS count FROM acme WHERE course IS NOT NULL GROUP BY course procc..
http://stackoverflow.com/questions/5867985/iframe-auto-100-height 100 iframe body TO HIDE SCROLLING WITH 2 ALTERNATIVES AS SHOWN ABOVE body style margin 0px padding 0px overflow hidden..
How do I get jqGrid to work using ASP.NET + JSON on the backend? http://stackoverflow.com/questions/727502/how-do-i-get-jqgrid-to-work-using-asp-net-json-on-the-backend do I get jqGrid to work using ASP.NET JSON on the backend ok I'm back. I totally simplified.. when adding one row of data manually. Can anyone PLEASE post a working sample of jqGrid that works with ASP.NET and.. PLEASE post a working sample of jqGrid that works with ASP.NET and JSON Would you please include 2 3 fields string integer..
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