I have some issue with using react-router. I get this error and couldn't render my app Uncaught TypeError: Cannot read property 'getCurrentLocation' of undefined
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## [AS3 Help!!](https://forum.kirupa.com/t/as3-help/636616)
i have a promblem with my code im new to flash and it has be really confussed i dont no alot about flash but the problem is TypeError: Error #1006: checkCollisionWithPlayer is not a function. at Platform/onEnterFrame() …
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## [Facebook's Prepack for JavaScript optimization](https://forum.kirupa.com/t/facebooks-prepack-for-javascript-optimization/636583)
The next big thing from Facebook (makers of react). It optimizes code execution by unrolling loops and whatnot. Examples in the link as well as other links to source etc.
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## [Chapter 15 - Issue while trying to do the build](https://forum.kirupa.com/t/chapter-15-issue-while-trying-to-do-the-build/636570)
Hi, I am encountering the following issue while trying to do a build. In my terminal I execute the following command ./node\_modules/.bin/webpack 192-168-1-7:MyTotallyAwesomeApp kavitha$ ./node\_modules/.bin/webpac…
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## [ERROR #10009 : Cannot access a property or method of a null object reference](https://forum.kirupa.com/t/error-10009-cannot-access-a-property-or-method-of-a-null-object-reference/636561)
Hi there, keep getting this error 1009. I debuged my code and the line pointed is the following and i don't know how to correct it. Tks a lot.
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## [AS3 touch events lagging and causing unwanted right-click behavior](https://forum.kirupa.com/t/as3-touch-events-lagging-and-causing-unwanted-right-click-behavior/636546)
This may be a long shot, but hopefully someone can help me with this. I’m running Windows 10 64-bit on a Dell Inspiron laptop with a 10-touch-point touchscreen. I can get touch events to fire but they’re not working the…
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## [keyboard event handling issues specific to Chrome?](https://forum.kirupa.com/t/keyboard-event-handling-issues-specific-to-chrome/636538)
Hello again; Let me start by saying that I don't really like posting about these issues, but I am having an issue with key board events specific to the Chrome browser. Mac OSX Yosemite, Chrome version 57.0.2987.133 (64…
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## [Emulating modal dialogs?](https://forum.kirupa.com/t/emulating-modal-dialogs/636530)
I have developed a module that I want to emulate modal dialogs. I can be used to present the user with dialog panels. It has a "confirm" style dialog and I want it to emulate the built in confirm dialog by blocking …
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## [The TransitionEnd Event | kirupa.com](https://forum.kirupa.com/t/the-transitionend-event-kirupa-com/352290)
by kirupa | 4 January 2013 While a transition is something you would bucket squarely in the CSS category, there is a certain level of co-operation between it and JavaScript. Events is one area w…
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## [Newsletter: Does the world need another book on animation?](https://forum.kirupa.com/t/newsletter-does-the-world-need-another-book-on-animation/636504)
This is a repost of the newsletter article I sent to many of you. If you aren’t a subscriber of the newsletter, you can fix that easily by clicking here :stuck\_out\_tongue: It’s 2017. Creating animations for the web is …
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## [Anybody following the CES 2017 news?](https://forum.kirupa.com/t/anybody-following-the-ces-2017-news/635768)
I'm a sucker for big TV screens, and this sounds really good: http://www.theverge.com/circuitbreaker/2017/1/4/14152650/hisense-sharp-100-inch-laser-tv \[image\] I have no need for a 4K tv right now, but who knows what m…
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## [Updating matrix transformation values & rAF](https://forum.kirupa.com/t/updating-matrix-transformation-values-raf/636495)
I am stuck at how requestAnimationFrame really works. With numerous tutorials out there I have some hang of it, but unable to apply the learnings to my javascript code with confidence. And then there is also a delta (tim…
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## [How to know when the mouse moves if the button is pressed](https://forum.kirupa.com/t/how-to-know-when-the-mouse-moves-if-the-button-is-pressed/636521)
Hi, I have a function that I need to access only if the mouse moved when the mouse botton is pressed
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## ["React-motion not updating state onScroll" was flagged as spam](https://forum.kirupa.com/t/react-motion-not-updating-state-onscroll-was-flagged-as-spam/636515)
This new user tried to create multiple posts with links to the same domain (codepen.io). See the newuser\_spam\_host\_threshold site setting.
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## [React-motion not updating state onScroll](https://forum.kirupa.com/t/react-motion-not-updating-state-onscroll/636503)
Hi everyone, First of all, I just wanted to say thanks to Kirupa for the fantastic book 'Learning React' - easily the best programming book I've ever read. He does a great job at explaining concepts in a way that's eas…
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## [Need a feedback on my new CMS platform](https://forum.kirupa.com/t/need-a-feedback-on-my-new-cms-platform/636501)
Hello Everyone, I am a front-end developer as well as wordpress. But in recent past i just felt to create something interesting. That's from where Webytor has born. Its not fuly finished yet. Just need a review from prof…
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## [Stanford's intro to CompSci course offers JavaScript alternative (vs Java)](https://forum.kirupa.com/t/stanfords-intro-to-compsci-course-offers-javascript-alternative-vs-java/636494)
I think the title is a little baity, especially with the caption “Java’s days are numbered”. It doesn’t seem like Java is going away, rather, there is a new alternative to use JavaScript instead with this quote stickin…
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## [Smooth Parallax Scrolling (CSS + JavaScript)](https://forum.kirupa.com/t/smooth-parallax-scrolling-css-javascript/636488)
I hv recreated ur code through the video, but I fail when it comes to the js part.. window.addEventListener("DOMContentLoaded", scrollLoop, false); var yellowCircle = document.querySelector("#yellowCir…
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## [How to send 2 requests in HTML / Javascript?](https://forum.kirupa.com/t/how-to-send-2-requests-in-html-javascript/636484)
I currently have a form that uploads file to a server the files are uploaded using the regular "multipart/form-data" and method="POST". I also am sending additional metadata to the server in the same post. For this I hoo…
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## [Why The News Is Not Being Pulled \[XML JS Query\]](https://forum.kirupa.com/t/why-the-news-is-not-being-pulled-xml-js-query/636483)
Here's my code. \ \ \ \ \ \News Site\ \ var xhttp = new XMLHttpRequest(); xhttp.onreadystatecha…
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## [Eliminate "Ghosting" when Dragging an Image in the Browser](https://forum.kirupa.com/t/eliminate-ghosting-when-dragging-an-image-in-the-browser/636353)
Hi, i’m working in a game, now I have the following problem I have to drag an image, but the navigator create a ghost image, that’s the problem, I have to eleminate it
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## [Multiple event handling](https://forum.kirupa.com/t/multiple-event-handling/636476)
Okay so since my professor told me about this article Handling Events for Many Elements I want to rewrite some of my old Javascript which apparently uses "bad practice" HTML \
Hey Guys! I am novice graphic designer and have recently made a logo. Can you give me some advice on how to improve it?
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## [Recognizing the calling object](https://forum.kirupa.com/t/recognizing-the-calling-object/636473)
Hi, I have an array of images obtained in this way: "var pictures = document.getElementsByTagName("img"). Besides, I have a function associated with each one of them called by "onclick", but I must know the index of c…
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## [Facebook announces React Fiber, a rewrite of its React framework](https://forum.kirupa.com/t/facebook-announces-react-fiber-a-rewrite-of-its-react-framework/636466)
It’s interesting that its: … an updated framework that is still fully backwards compatible with existing React-based applications. So it sounds like a drop-in replacement for the previous incarnation which is now e…
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## [Clipping Content Using the overflow CSS Property | kirupa.com](https://forum.kirupa.com/t/clipping-content-using-the-overflow-css-property-kirupa-com/352097)
Clipping Content Using the overflow CSS Property by kirupa | 3 August 2013 Often, you will run into cases where you want to display some content that is larger than its container: …
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## [Safari problems](https://forum.kirupa.com/t/safari-problems/636401)
Hey everybody. It's my first post so please forgive mistakes. I created a website - http://huskyagency.com/ which works good on different browsers except Safari which has problem with displaying whole sections. I can't…
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## [Atom docs showing odd characters when opened](https://forum.kirupa.com/t/atom-docs-showing-odd-characters-when-opened/636452)
I'm an OSX (10.12) user and recently started having issues opening the html/doc files created to follow along with the tutorials on the site. Whenever I try opening a file as normal, it reads out in Chrome: Â Â Â Â Â…
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## [simple opening a database](https://forum.kirupa.com/t/simple-opening-a-database/636465)
I use MS Access 2013 not very often, but last time I got - Microsoft Access has encountered a problem and needs to close. I only opened my saved database that was all. I hope somewhere there is a Repair MDB tool.
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## [kirupa.com - Reading XML in .NET - Page 1](https://forum.kirupa.com/t/kirupa-com-reading-xml-in-net-page-1/636457)
XML, or Extensible Markup Language, is a very popular format used to store and share data. In a nutshell, XML stores information in a tree-based text format that allows both you and I as well as …
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