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  • How to run/test JavaScript? [closed]

    - by user702
    I'm reading David Flanagan's "JavaScript: The Definitive Guide, 6th ed". It only actually tells users how to run JS code on page 311, where users are told of the following solutions: "Client-side JavaScript code is embedded within HTML documents in four ways: Inline, between a pair of <script> and </script> tags From an external file specified by the src attribute in a <script> tag In an HTML event handler attribute, such as onclick or onmouseover In a URL that uses the special javascript: protocol." I was wondering what professional JS developers use to write and test their code: Do they use a good text editor with syntax high-lighting + autocompletion, hit F5 in the browser to reload the page every time they make a change, and use some add-on in the browser to investigate errors? Or are there full-fledged IDE's similar to MS VisualStudio for non-web languages?

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  • Java EE/GlassFish@Java2Days

    - by reza_rahman
    Java2Days 2012 was held in Sofia, Bulgaria on October 25-26. This was the third installment of the premier Java conference for the Balkan region, having three separate tracks for Java, the Cloud and Mobile. It attracted over a thousand enthusiastic, bright young developers and a number of world class speakers. There were no less than three full-house sessions on Java EE/GlassFish - one on Java EE 7, one on Domain-Driven Design using Java EE 6 and one on JSR 356/WebSocket. More details on Java EE/GlassFish@Java2Days, including slides and code examples, posted here.

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  • What is the most cross-browser/system compatible option for 3d graphics on a web page?

    - by LachlanB
    I would like to develop a bit of functionality for a web site that involves a bit of 3D - the user can move around objects, rotate them and texture them. So far I've looked into: WebGL (in particular three.js) and it looks great, but it's not supported in IE nor IOS. IOS supports the <canvas> tag, but only 2d. It looks like three.js has an unsupported hack to make a 3d thing use the 2d canvas instead without textures, but this looks like a hack. I also considered resorting to Flash which works on most browsers, but that won't work on IOS. What's my best option for doing 3d web graphics on the vast array of browsers and interfaces? At the moment I'm thinking WebGL for web (and ask people to use chrome or firefox, and take the hit on IE) and then maybe write a native app for IOS, but I am not sure if there are better alternatives available that I don't know of.

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  • NeDB : la base de données légère écrite en JavaScript sort, simple et persistante, elle peut être utilisée « in-memory »

    NeDB : la base de données légère écrite en JavaScript sort Simple et persistante, elle peut être utilisée « in-memory »« Où pourrais-je trouver une base de données légère à utiliser dans mes projets Node.js ? » Cette question, un développeur du nom de Louis Chatriot se l'est posée. Ne trouvant rien de concret dans ses recherches qui répond à ses attentes, ce dernier a développé sa propre solution en JavaScript, qu'il a par la suite nommée NeDB.Le but de Chatriot n'est pas de rivaliser avec les caïds en place comme MongoDB ou Couch. En effet, NeDB dérive de MongoDB. Chatriot le compare à une sorte de SQL lite taillé pour les projets Node.js.NeDB prend en charge l'indexation. Le développeur...

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  • Developing a search algorithm

    - by Richart Bremer
    I want to create a basic search engine, and I want you to give me some ideas how to filter out the best results for my visitors. I have three fields regarding a product the user can search in: Title Category Description I came up with these ideas and I ask you to either competently criticize them or add to them. If the search term occurs in all three fields it should be among the first results. If it is in two of the fields it is below the results of 1. Combine the amount of occurences and output a value in per cent. For instance if in all fields together the term clock appeared 50 times and in all fields together there are 200 words, then the per cent value is 50/200*100 = 25%. Another product entry amounts to say 20% so product one having 25% is listed before product two having 20%.

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  • Is there a way to setup Clicktale tag in Google Tag Manager?

    - by Cubius
    Since GTM doesn't support document.write() method the standard clicktale code doesn't work. Is there a workaround for this? ClickTale employee has sent me these instructions: Replace the document.write JS line above with the following: document.body.appendChild(externalScript); Example: <!-- ClickTale Bottom part --> <script type='text/javascript'> var externalScript = document.createElement('script'); var scrSrc = document.location.protocol=='https:'? 'https://clicktalecdn.sslcs.cdngc.net/': 'http://cdn.clicktale.net/'; scrSrc += 'www11/ptc/xxx-xxx-xxx-xxx.js'; externalScript.src = scrSrc; externalScript.type = 'text/javascript'; document.body.appendChild(externalScript); </script> <!-- ClickTale end of Bottom part --> I am not sure what to do with this. Has someone tried something like this?

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  • Event Aggregator.. not getting a response, how to determine completion?

    - by Duncan_m
    I'm rewriting a vehicle tracking application, a google maps based thing.. The users are able to search for a vehicle by typing a few characters of the vehicles "callsign". My application is based around a sort of "event bus" within Backbone.. when a search occurs I send a message on the bus saying something like "does anyone match this?".. If a marker matches the search term it responds with a sort of "yes, I match!".. My challenge arises when no-one matches, I get no response.. it feels a little hacky to "wait a little while" and check if a response has been recieved.. The application is based around Backbone.js and using the Event Aggregator pattern described in the answer to this question on Stack Overflow: http://stackoverflow.com/questions/7708195/access-function-in-one-view-from-another-in-backbone-js Is there a well defined design pattern that might assist me here? Sending a request for a response and not getting any responses?

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  • Alt text vs CSS sprites (SEO vs speed)

    - by leeoniya
    I'm reworking our site to reduce HTTP requests and blocking requests by concatenating JS, css, gzipping, loading all JS via LABjs and using CSS sprites for images that were loaded individually via <img> tags before. Progress has been great so far - 5x page load performance improvement. However, we're in the top 5 organic search ranking in google for many targeted keywords and phrases. I'm afraid eliminating so many img tags with alt attributes can hurt our SEO. Does anyone have any experience with alt tag manip/removal and effects on SEO positions? Is previous rank "sticky"?

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  • Multiple Passwords on One Account

    - by user110789
    I'd like to join three ideas into one interesting and sometimes useful feature. There was a question about using multiple passwords earlier this year, but it didn't receive much attention. I'd like to ask the question again after showing an interesting and new way to use the feature. The three original posts I found to be interestingly combined were: (1) Multiple passwords per user (2) http://blog.littleimpact.de/index.php/2009/09/14/automatic-encryption-of-home-directories-using-truecrypt-62-and-pam_exec/ (3) http://www.truecrypt.org/docs/hidden-volume Basically I'd like to login to my account with two passwords and depending on the password I use, I would get a different content in my home directory. In a way I would get a cryptographically hidden account into my system. So the question is, is it possible to allow multiple passwords to log on to Ubuntu/Linux for the same user?

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  • Rotate an object given only by its points?

    - by d33tah
    I was recently writing a simple 3D maze FPP game. Once I was done fiddling with planes in OpenGL, I wanted to add support for importing Blender objects. The approach I used was triangulization of the object, then using Three.js to export the points to plaintext and then parsing the result JSON in my app. The example file can be seen here: https://github.com/d33tah/tinyfpp/blob/master/Data/Models/cross.txt The numbers represent x,y,z,u,v of a single vertex, which combined in three make a triangle. Then I rendered such an object triangle-by-triangle and played with it. I could move it back and forth and sideways, but I still have no idea how to rotate it by some axis. Let's say I'd like to rotate all the points by five degrees to the left, how would a code doing it look like?

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  • Notes from AT&T ARO Session at Oredev 2013

    - by Geertjan
    The mobile internet is 12 times bigger than internet was 12 years ago. Explosive growth, faster networks, and more powerful devices. 85% of users prefer mobile apps, while 56% have problems. Almost 60% want less than 2 second mobile app startup. App with poor mobile experience results in not buying stuff, going to competitor, not liking your company. Battery life. Bad mobile app is worse than no app at all because it turns people away from brand, etc. Apps didn't exist 10 years ago, 72 billion dollars a year in 2013, 151 billion in 2017.Testing performance. Mobile is different than regular app. Need to fix issues before customers discover them. ARO is free and open source AT&T tool for identifying mobile app performance problems. Mobile data is different -- radio resource control state machine. Radio resource control -- radio from idle to continuous reception -- drains battery, sends data, packets coming through, after packets come through radio is still on which is tail time, after 10 seconds of no data coming through radio goes off. For example, YouTube, e.g., 10 to 15 seconds after every connection, can be huge drain on battery, app traffic triggers RRC state. Goal. Balance fast network connectivity against battery usage. ARO is free and open source and test any platform and won awards. How do I test my app? pcap or tcdump network. Native collector: Android and iOS. Android rooted device is needed. Test app on phone, background data, idle for ads and analytics. Graded against 25 best practices. See all the processes, all network traffic mapped to processes, stats about trace, can look just at your app, exlude Facebook, etc. Many tests conducted, e.g., file download, HTML (wrapped applications, e.g., cordova). Best Practices. Make stuff smaller. GZIP, smaller files, download faster, best for files larger than 800 bytes, minification -- remove tabs and commenting -- browser doesn't need that, just give processor what it needs remove wheat from chaff. Images -- make images smaller, 1024x1024 image for a checkmark, swish it, make it 33% smaller, ARO records the screen, probably could be 9 times smaller. Download less stuff. 17% of HTTP content on mobile is duplicate data because of caching, reloading from cache is 75% to 99% faster than downloading again, 75% possible savings which means app will start up faster because using cache -- everyone wants app starting up 2 seconds. Make fewer HTTP requests. Inline and combine CSS and JS when possible reduces the number of requests, spread images used often. Fewer connections. Faster and use less battery, for example, download an image every 60 secs, download an add every 60 seconds, send analytics every 60 seconds -- instead of that, use transaction manager, download everything at once, reduce amount of time connected to network by 40% also -- 80% of applications do NOT close connections when they are finished, e.g., download picture, 10 seconds later the radio turns off, if you do not explicitly close, eventually server closes, 38% more tail time, 40% less energy if you close connection right away, background data traffic is 27% of data and 55% of network time, this kills the battery. Look at redirection. Adds 200 to 600 ms on each connection, waterfall diagram to all the requests -- e.g., xyz.com redirect to www.xyz.com redirect to xyz.mobi to www.xyz.com, waterfall visualization of packets, minimize redirects but redirects are fine. HTML best practices. Order matters and hiding code (JS downloading blocks rendering, always do CSS before JS or JS asynchronously, CSS 'display:none' hides images from user but the browser downloads them which adds latency to application. Some apps turn on GPS for no reason. Tell network when down, but maybe some other app is using the radio at the same time. It's all about knowing best practices: everyone wins with ARO (carriers, e.g., AT&T, developers, customers). Faster apps, better battery usage, network traffic better, better app reviews, happier customers. MBTA app, referenced as an example.ARO is free, open source, can test all platforms.

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  • Exclude PHP from output from WYSIWYG in CMS

    - by bytewalls
    I'm writing a basic CMS for one of my sites and have run into an issue where some pages need to dynamically serve PHP and JS, where as others are plain HTMl. I want there to be a setting which will allow this for the pages that need it and will load ACE editor instead of a different wysiwyg editor. The challenge here is that on the pages which I do not explicitly tell it there will be code, I want to reject any inputs that code. I can set it up to insert a for all pages without JS, but how can I keep php code from running?

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  • Why does service service_name status give different responses for different services?

    - by Code Ghar
    Running the "service service_name status" command gives three different types of output when three different service_names are used. I tried with atftpd, apache2, and isc-dhcp-server, as shown below. user@host:~$ service atftpd status Usage: /etc/init.d/atftpd {start|stop|restart|reload|force-reload} user@host:~$ service apache2 status Apache2 is running (pid 1103). user@host:~$ service isc-dhcp-server status isc-dhcp-server start/running, process 5696 Could this be because atftpd has not been converted to Upstart? The status for isc-dhcp-server shows "start/running" which indicates it has been converted to use Upstart. I would've thought apache2 would have been converted to Upstart already. If it has then why does it not display "start/running"?

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  • Better php framework for shared hosting

    - by ravz
    I need to develop an app for booking appointments. This is gonna be hosted in a shared server. So performance is the most important thing. I have used symfony2. I quite liked the framework. But seems to be heavy. Which framework would suit me considering my requirements? I have shortlisted three frameworks yii, symfony2 and ZF2. I am not asking which framework is better. All the three are good frameworks. I want to know which will suit my requirements. My first priority would be performance (I will be using AJAX wherever possible), second would be maintenance and development time and third community support. Or should I use my own handlers to separate views and logic and just use raw php?

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  • JavaScript : vérifiez votre code en ligne grâce à JSLint, mise à jour majeure de l'outil open source

    Contrôler votre code JavaScript avec ce vérificateur en ligne De la même manière que CSS Lint s'est imposé dans la validation de feuilles de style CSS, JS Lint va très certainement devenir un classique. Cet outil vous permet de vérifier votre code JavaScript en ligne. Pour se faire vous disposez de toutes une séries d'options à régler, en fonction de vos besoins. L'outil est bien évidemment écrit en JavaScript ; la boucle est bouclée ! A noter que JS Lint permet également la vérification de source HTML, CSS ou encore JSON.

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  • Architecture driven by users, or by actions/content?

    - by hugerth
    I have a question about designing MVC app architecture. Let's say our application has three main categories of views (items of type 1, items of type 2...). And we have three (or more in future) types of users - Admins, let's say Moderators and typical Users. And in the future there might be more of them. Admins have full access to app, Moderators can visit only 2/3 type of items, and Users can visit only basic type of items. Should I divide my controllers/views/whatever like this: Items "A", Items "B", Items "C", then make them 100% finished and at the end add access privileges? Pros: DRY option Cons Conditional expressions in views Or another options: Items "A" / Admin, Items "A" / Moderator / Items "B" Admin ...? Pros: Divided parts of application for specific user (is that pros?) Cons: A lot of repeated code I don't have great experience in planning such things so it would nice if you can give me some tips or links to learn something about it.

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  • Android Game Development in Java [on hold]

    - by Nusrat
    I have been searching for some good tutorials/frameworks for developing an Android Game . I want to develop a 3D Car Racing game . I have already looked into http://stackoverflow.com/questions/4227759/android-game-engine-for-2d-and-3d-games. Now , i know that Android Games can be developed using Java/Action Scripts/JS etc . Many of the users are suggesting me to use http://unity3d.com , but i found that it uses JavaScript, C#, Boo . I don't know JS too much , Is it possible to develop a very professional level Game for Android using my Java knowledge ? Any Software like Unity which allow me to code in Java ?

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  • When going for an interview for web development at an agency, can a real example be expected?

    - by KPO
    I just started coding a year ago. By "coding" I mean HTML(5), CSS(3), and only a few times I implemented AJAX and JavaScript. I am interviewing for a position that expects me to know HTML, CSS, JS, JQuery, and AJAX. I am good with HTML5/CSS3 and somewhat ok with js. If I go for an interview, will they expect me to write code during the interview? I do have a live website as an example and snapshots of past projects that I sent to them. I am a little nervous, so any tips or something from your experience I can learn will be helpful.

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  • How do you make a 2D character in Javascript? [on hold]

    - by user36507
    How do you actually make a character in JS? I know you are supposed to use objects like var character = new Object(); (If the code has errors I apologise.)But how do you make the character move using keys WASD or let the character pick up items. What I want to know is that whether you need a canvas created specially for the character, how to add attributes and use keys to move it all in code. Also it would be great if you could help me on how to import pictures to JS to use it.

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  • "'0.offsetWidth' is null or not an object" - Coda Slider - Javascript Error Question

    - by bgadoci
    I implemented the Coda Slider tutorial successfully that is located here: http://jqueryfordesigners.com/coda-slider-effect/ The slider works great but I am getting a javascript error that I am not sure how to fix. The error says: '0.offsetWidth' is null or not an object coda-slider.js, line 19 character 3 Not sure how to fix it. Anyone have any ideas? Here is my js and css (don't think I need to upload the HTML but let me know if that helps). JS (coda-slider.js) // when the DOM is ready... $(document).ready(function () { var $panels = $('#slider .scrollContainer > div'); var $container = $('#slider .scrollContainer'); // if false, we'll float all the panels left and fix the width // of the container var horizontal = true; // float the panels left if we're going horizontal if (horizontal) { $panels.css({ 'float' : 'left', 'position' : 'relative' // IE fix to ensure overflow is hidden }); // calculate a new width for the container (so it holds all panels) $container.css('width', $panels[0].offsetWidth * $panels.length); <------line 19 } // collect the scroll object, at the same time apply the hidden overflow // to remove the default scrollbars that will appear var $scroll = $('#slider .scroll').css('overflow', 'hidden'); // apply our left + right buttons $scroll .before('<img class="scrollButtons left" src="/images/layout/navigation/scroll_left.png" />') .after('<img class="scrollButtons right" src="/images/layout/navigation/scroll_right.png" />'); // handle nav selection function selectNav() { $(this) .parents('ul:first') .find('a') .removeClass('selected') .end() .end() .addClass('selected'); } $('#slider .navigation').find('a').click(selectNav); // go find the navigation link that has this target and select the nav function trigger(data) { var el = $('#slider .navigation').find('a[href$="' + data.id + '"]').get(0); selectNav.call(el); } if (window.location.hash) { trigger({ id : window.location.hash.substr(1) }); } else { $('ul.navigation a:first').click(); } // offset is used to move to *exactly* the right place, since I'm using // padding on my example, I need to subtract the amount of padding to // the offset. Try removing this to get a good idea of the effect var offset = parseInt((horizontal ? $container.css('paddingTop') : $container.css('paddingLeft')) || 0) * -1; var scrollOptions = { target: $scroll, // the element that has the overflow // can be a selector which will be relative to the target items: $panels, navigation: '.navigation a', // selectors are NOT relative to document, i.e. make sure they're unique prev: 'img.left', next: 'img.right', // allow the scroll effect to run both directions axis: 'xy', onAfter: trigger, // our final callback offset: offset, // duration of the sliding effect duration: 500, // easing - can be used with the easing plugin: // http://gsgd.co.uk/sandbox/jquery/easing/ easing: 'swing' }; // apply serialScroll to the slider - we chose this plugin because it // supports// the indexed next and previous scroll along with hooking // in to our navigation. $('#slider').serialScroll(scrollOptions); // now apply localScroll to hook any other arbitrary links to trigger // the effect $.localScroll(scrollOptions); // finally, if the URL has a hash, move the slider in to position, // setting the duration to 1 because I don't want it to scroll in the // very first page load. We don't always need this, but it ensures // the positioning is absolutely spot on when the pages loads. scrollOptions.duration = 1; $.localScroll.hash(scrollOptions); }); CSS #slider { margin-left: 35px; position: relative; width: 875px; } .scroll { position: relative; width: 875px; height: 268px; overflow: auto; /* fix for IE to respect overflow */ background: #FFFFFF scroll 0; } .scrollContainer div.panel { position: relative; height: 210px; width: 875px; /* change to 560px if not using JS to remove rh.scroll */ } .scrollButtons { position: absolute; top: 115px; cursor: pointer; } .scrollButtons.left { left: -20px; } .scrollButtons.right { right: -20px; }

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