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  • JavaScript using toString on a Function object to read text content

    - by mseeley
    Calling toString() on the function below returns different strings across browsers. I understand this is because ECMA-262 15.3.4.2 leaves wiggle room for each vendor. Chrome returns the comments in addition to all syntax. Sadly Firefox 3.6 omits the comments. Based on Firefox's behavior I haven't tested IE, Opera, or Safari. function foo() { /* comment */ var bar = true; } Specifically, I am attempting to embed meta data within a specially formatted comment block within a function. Later the return value of the functions toString() method would be parsed and values returned as an object. I've been unable to locate compatibility tables or alternatives to toString(). Does the community have any ideas? Btw, pre-processing JS files isn't an option. :( Thanks a lot. :)

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  • Javascript/jQuery: Varying parameters on a custom function

    - by dclowd9901
    I'm writing a plugin that will allow parameters to 'set it up.' But I predict the user won't always want to set up every aspect of the function. function This_Function(a,b,c,d); For instance, maybe they'll only want to set up a and c, but not b and d (they'll just prefer to leave those as defaults). How do I write the function (or the parameters for that matter) so that the user can customize which functions they would prefer to pass? I have a feeling it involves parsing input, but I've seen many other functions with this capability. Thanks in advance for the help.

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  • MySQL function return more than 1 row

    - by bobobobo
    I'd like to write a MySQL stored function that returns multiple rows of data. Is this possible? It seems to be locked at 1 row -- can't even return 0 rows. For example DELIMITER // create function go() RETURNS int deterministic NO SQL BEGIN return null ; -- this doesn't return 0 rows! it returns 1 row -- return 0 ; END // DELIMITER ; Returning null from a MySQL stored proc though, doesn't return 0 rows.. it returns 1 row with the value null in it. Can I return 0, or more than 1 row from a MySQL function, how?

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  • lwjgl isKeyDown canceling out other keys

    - by AKrush95
    While trying to create a simple game where a square is manipulated via the keyboard keys, I have come across a small, rather irritating problem. I would like it to work so that when the opposite directional key is pressed, the character will stop; the character may move the other two directions while stopped in this situation. This works perfectly with LEFT and RIGHT held down; the player may move UP or DOWN. If UP and DOWN are held down, however, the player will not move, nor will Java recognize that the LEFT or RIGHT keys were pressed. import java.util.ArrayList; import java.util.Random; import org.lwjgl.*; import org.lwjgl.input.Keyboard; import org.lwjgl.opengl.*; import static org.lwjgl.opengl.GL11.*; public class Main { private Man p; private ArrayList<Integer> keysDown, keysUp; public Main() { try { Display.setDisplayMode(new DisplayMode(640, 480)); Display.setTitle("LWJGLHelloWorld"); Display.create(); } catch (LWJGLException e) { e.printStackTrace(); } p = new Man(0, 0); keysDown = new ArrayList<>(); keysUp = new ArrayList<>(); glMatrixMode(GL_PROJECTION); glLoadIdentity(); glOrtho(0, 640, 480, 0, 1, -1); glMatrixMode(GL_MODELVIEW); while (!Display.isCloseRequested()) { glClear(GL_COLOR_BUFFER_BIT); checkKeys(); p.draw(); Display.update(); Display.sync(60); } Display.destroy(); } public void checkKeys() { ArrayList<Integer> keys = new ArrayList<>(); keys.add(Keyboard.KEY_A); keys.add(Keyboard.KEY_D); keys.add(Keyboard.KEY_W); keys.add(Keyboard.KEY_S); for (int key : keys) { if (Keyboard.isKeyDown(key)) keysDown.add(key); else keysUp.add(key); } keysDown.removeAll(keysUp); keysUp = new ArrayList<>(); int speed = 4; int dx = 0; int dy = 0; if (keysDown.contains(keys.get(2))) { System.out.println("keyUP"); dy -= speed; } if (keysDown.contains(keys.get(3))) { System.out.println("keyDOWN"); dy += speed; } if (keysDown.contains(keys.get(0))) { System.out.println("keyLEFT"); dx -= speed; } if (keysDown.contains(keys.get(1))) { System.out.println("keyRIGHT"); dx += speed; } //if (keysDown.contains(keys.get(0)) && keysDown.contains(keys.get(1))) dx = 0; //if (keysDown.contains(keys.get(2)) && keysDown.contains(keys.get(3))) dy = 0; p.update(dx, dy); } public static void main(String[] args) { new Main(); } class Man { public int x, y, w, h; public float cR, cG, cB; public Man(int x, int y) { this.x = x; this.y = y; w = 50; h = 50; Random rand = new Random(); cR = rand.nextFloat(); cG = rand.nextFloat(); cB = rand.nextFloat(); } public void draw() { glColor3f(cR, cG, cB); glRecti(x, y, x+w, y+h); } public void update(int dx, int dy) { x += dx; y += dy; } } } That is the code that I am working with. In addition, I am unsure how to compile an executable jar that is using the lwjgl library in addition to slick-util.

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  • Function naming: sendCharacter or receiveCharacter?

    - by bobobobo
    I'm trying to name a function that runs when a character is received by the object. For the caller, it should be named sendCharacter, so that it can call: object->sendCharacter( character ) ; That looks nice for the caller.. but for the receiver, it implements a method /// Called when this object is do something /// with a character /// from the caller void sendCharacter( char c ) ; So for the recipient class, it looks like this method will actually send a character out, not receive one. So then, I could call the function receiveCharacter /// Called when this object is do something /// with a character /// from the caller void receiveCharacter( char c ) ; But now the caller does this: object->receiveCharacter( character ) ; Which just looks odd. How can I better name this function?

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  • PHP: variable not working inside of function?

    - by mathiregister
    hi guys, echo $path; //working function createList($retval) { echo $path; //not working print "<form method='POST' action='' enctype='multipart/form-data'>"; foreach ($retval as $value) { print "<input type='checkbox' name='deletefiles[]' id='$value' value='$value'>$value<br>"; } print "<input class='submit' name='deleteBtn' type='submit' value='Datei(en) löschen'>"; print "</form>"; } what am I doing wrong? why is $path printed corretly outside of the createlist function, but it's not inside of the function?

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  • Javascript - Function call will not enter function body

    - by Mike S
    I have a function acting as a constructor that, when called, gets as far as the function definition in the debugger, but never to the function body. Is there a common reason this may happen that I am overlooking? Example code below: myconstructor.js function MyConstructor(optionalParam) { //this breakpoint gets hit var newobj = {}; //breakpoint never hit //code to check for null parameter //other code }; main.js var myConstructor = new MyConstructor(); There must be something I have overlooked, but I can't see what that is. Neither firefox/firebug nor VS report errors or warnings. Thanks!

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  • javascript function object's inheritFrom method

    - by gawpertron
    I've come across this.inheritFrom that enables you to inherit from a super class. var superClass = function() { this.foo = 'foo'; this.bar = 'bar'; } var subClass = function() { this.inheritFrom = superClass; this.inheritFrom(); this.myFunction = function() { return this.foo; }; } I've looked in Mozilla and MSDN, but I can't seem to find it documented any where. As far as I can see it works in IE6 and Firefox 3. Any reason why it wouldn't be documented?

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  • How to pass a function to a function?

    - by ShaChris23
    Suppose I have a class with 2 static functions: class CommandHandler { public: static void command_one(Item); static void command_two(Item); }; I have a problem DRY problem where I have 2 functions that have the exact same code for every single line, except for the function that it calls: void CommandOne_User() { // some code A CommandHandler::command_one(item); // some code B } void CommandTwo_User() { // some code A CommandHandler::command_two(item); // some code B } I would like to remove duplication, and, ideally, do something like this: void CommandOne_User() { Function func = CommandHandler::command_one(); Refactored_CommandUser(func); } void CommandTwo_User() { Function func = CommandHandler::command_one(); Refactored_CommandUser(func); } void Refactored_CommandUser(Function func) { // some code A func(item); } I have access to Qt, but not Boost. Could someone help suggest a way on how I can refactor something like this?

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  • Confusion regarding a function definition in C

    - by user34790
    I found this function definition void *func(void *param) { } Actually, I have a certain confusion regarding this function definition. What does void * mean in the return type of the function as well as the argument. I am a beginner in C. So please don't mind. Thank you void *func(void *param) { int s = (int)param; .... } Well looking at the above program which I found. I think it should have been int *s = (int *)param; isn't it? I am confused

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  • AS3 Random repeat x seconds function

    - by Lilk
    Hi, I have the following function: function update(e:Event):void { var val:Number = Math.random() * 120; rgb.r.x = rgb.r.y = val; rgb.b.x = rgb.b.y = -val; } And im looping it with: stage.addEventListener(Event.ENTER_FRAME, update); But what I need to do would be something like: Random number between 1 and 20 If the number is > 10 Call function Update and keep caling it for 20 seconds else do nothing for 10 seconds Repeat this block of code forever Can someone help me write this please?

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  • [C++] Start a thread using a method pointer

    - by Michael
    Hi ! I'm trying to develop a thread abstraction (POSIX thread and thread from the Windows API), and I would very much like it to be able to start them with a method pointer, and not a function pointer. What I would like to do is an abstraction of thread being a class with a pure virtual method "runThread", which would be implanted in the future threaded class. I don't know yet about the Windows thread, but to start a POSIX thread, you need a function pointer, and not a method pointer. And I can't manage to find a way to associate a method with an instance so it could work as a function. I probably just can't find the keywords (and I've been searching a lot), I think it's pretty much what Boost::Bind() does, so it must exist. Can you help me ?

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  • Call inner function of jQuery-Plugin-function?

    - by faileN
    Hello Everyone, I've written an jQuery-Plugin, which I want to use as Object. So I declared some functions within the plugin, which I want to call from any other location, just like an object with methods. Is that even possible? To keep it simple: (function( $ ){ $.fn.myPlugin = function(){ // Here I want methods... function foo() { // do something... } } })(jQuery); Then I want to call the inner function from outside the plugin like: $.myPlugin.foo(); But that doesn't seem to work. So is it even possible? Or are there any other solutions? I don't want to use an normal unrelated jQuery-Class for this purpose. Because this plugin should work together with some other jQuery-Plugins. Thank you

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  • Convert from c# function to javascript function

    - by socheata
    I have a function in c# that used to manipulate the string, It works well while I used in C#. Now I want to convert this function to use in javascript. This is the function in c#: public static string TrimString(string str, int lenght) { string _str = str; int _iAdditionalLenght = 0; for (int i = lenght; i < str.Length; i++) { if (_str.Substring(i, 1) == " ") break; _iAdditionalLenght++; } return str.Substring(0, str.Length < (lenght + _iAdditionalLenght) ? str.Length : (lenght + _iAdditionalLenght)); } I converted it to javascript : function TrimString(str, lengthStr) { //this is my testing 4 var _str = str; var _iAdditionalLenght = 0; for (var i = lengthStr; i < str.length; i++) { if (_str.substring(i, 1) == " ") break; _iAdditionalLenght++; } return str.substring(0, str.length < (lengthStr + _iAdditionalLenght) ? str.length : (lengthStr + _iAdditionalLenght)); } But the javascript doesn't work. Could anyone tell me, how could I do it in javascript function? Thanks you so much.

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  • New MySQL Cluster 7.3 Previews: Foreign Keys, NoSQL Node.js API and Auto-Tuned Clusters

    - by Mat Keep
    At this weeks MySQL Connect conference, Oracle previewed an exciting new wave of developments for MySQL Cluster, further extending its simplicity and flexibility by expanding the range of use-cases, adding new NoSQL options, and automating configuration. What’s new: Development Release 1: MySQL Cluster 7.3 with Foreign Keys Early Access “Labs” Preview: MySQL Cluster NoSQL API for Node.js Early Access “Labs” Preview: MySQL Cluster GUI-Based Auto-Installer In this blog, I'll introduce you to the features being previewed. Review the blogs listed below for more detail on each of the specific features discussed. Save the date!: A live webinar is scheduled for Thursday 25th October at 0900 Pacific Time / 1600UTC where we will discuss each of these enhancements in more detail. Registration will be open soon and published to the MySQL webinars page MySQL Cluster 7.3: Development Release 1 The first MySQL Cluster 7.3 Development Milestone Release (DMR) previews Foreign Keys, bringing powerful new functionality to MySQL Cluster while eliminating development complexity. Foreign Key support has been one of the most requested enhancements to MySQL Cluster – enabling users to simplify their data models and application logic – while extending the range of use-cases for both custom projects requiring referential integrity and packaged applications, such as eCommerce, CRM, CMS, etc. Implementation The Foreign Key functionality is implemented directly within the MySQL Cluster data nodes, allowing any client API accessing the cluster to benefit from them – whether they are SQL or one of the NoSQL interfaces (Memcached, C++, Java, JPA, HTTP/REST or the new Node.js API - discussed later.) The core referential actions defined in the SQL:2003 standard are implemented: CASCADE RESTRICT NO ACTION SET NULL In addition, the MySQL Cluster implementation supports the online adding and dropping of Foreign Keys, ensuring the Cluster continues to serve both read and write requests during the operation.  This represents a further enhancement to MySQL Cluster's support for on0line schema changes, ie adding and dropping indexes, adding columns, etc.  Read this blog for a demonstration of using Foreign Keys with MySQL Cluster.  Getting Started with MySQL Cluster 7.3 DMR1: Users can download either the source or binary and evaluate the MySQL Cluster 7.3 DMR with Foreign Keys now! (Select the Development Release tab). MySQL Cluster NoSQL API for Node.js Node.js is hot! In a little over 3 years, it has become one of the most popular environments for developing next generation web, cloud, mobile and social applications. Bringing JavaScript from the browser to the server, the design goal of Node.js is to build new real-time applications supporting millions of client connections, serviced by a single CPU core. Making it simple to further extend the flexibility and power of Node.js to the database layer, we are previewing the Node.js Javascript API for MySQL Cluster as an Early Access release, available for download now from http://labs.mysql.com/. Select the following build: MySQL-Cluster-NoSQL-Connector-for-Node-js Alternatively, you can clone the project at the MySQL GitHub page.  Implemented as a module for the V8 engine, the new API provides Node.js with a native, asynchronous JavaScript interface that can be used to both query and receive results sets directly from MySQL Cluster, without transformations to SQL. Figure 1: MySQL Cluster NoSQL API for Node.js enables end-to-end JavaScript development Rather than just presenting a simple interface to the database, the Node.js module integrates the MySQL Cluster native API library directly within the web application itself, enabling developers to seamlessly couple their high performance, distributed applications with a high performance, distributed, persistence layer delivering 99.999% availability. The new Node.js API joins a rich array of NoSQL interfaces available for MySQL Cluster. Whichever API is chosen for an application, SQL and NoSQL can be used concurrently across the same data set, providing the ultimate in developer flexibility.  Get started with MySQL Cluster NoSQL API for Node.js tutorial MySQL Cluster GUI-Based Auto-Installer Compatible with both MySQL Cluster 7.2 and 7.3, the Auto-Installer makes it simple for DevOps teams to quickly configure and provision highly optimized MySQL Cluster deployments – whether on-premise or in the cloud. Implemented with a standard HTML GUI and Python-based web server back-end, the Auto-Installer intelligently configures MySQL Cluster based on application requirements and auto-discovered hardware resources Figure 2: Automated Tuning and Configuration of MySQL Cluster Developed by the same engineering team responsible for the MySQL Cluster database, the installer provides standardized configurations that make it simple, quick and easy to build stable and high performance clustered environments. The auto-installer is previewed as an Early Access release, available for download now from http://labs.mysql.com/, by selecting the MySQL-Cluster-Auto-Installer build. You can read more about getting started with the MySQL Cluster auto-installer here. Watch the YouTube video for a demonstration of using the MySQL Cluster auto-installer Getting Started with MySQL Cluster If you are new to MySQL Cluster, the Getting Started guide will walk you through installing an evaluation cluster on a singe host (these guides reflect MySQL Cluster 7.2, but apply equally well to 7.3 and the Early Access previews). Or use the new MySQL Cluster Auto-Installer! Download the Guide to Scaling Web Databases with MySQL Cluster (to learn more about its architecture, design and ideal use-cases). Post any questions to the MySQL Cluster forum where our Engineering team and the MySQL Cluster community will attempt to assist you. Post any bugs you find to the MySQL bug tracking system (select MySQL Cluster from the Category drop-down menu) And if you have any feedback, please post them to the Comments section here or in the blogs referenced in this article. Summary MySQL Cluster 7.2 is the GA, production-ready release of MySQL Cluster. The first Development Release of MySQL Cluster 7.3 and the Early Access previews give you the opportunity to preview and evaluate future developments in the MySQL Cluster database, and we are very excited to be able to share that with you. Let us know how you get along with MySQL Cluster 7.3, and other features that you want to see in future releases, by using the comments of this blog.

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  • SQL SERVER – Validating Spatial Object as NULL using IsNULL

    - by pinaldave
    Follow up questions are the most fun part of writing a blog post. Earlier I wrote about SQL SERVER – Validating Spatial Object with IsValidDetailed Function and today I received a follow up question on the same subject. The question was mainly about how NULL is handled by spatial functions. Well, NULL is NULL. It is very easy to work with NULL. There are two different ways to validate if the passed in the value is NULL or not. 1) Using IsNULL Function IsNULL function validates if the object is null or not, if object is not null it will return you value 0 and if object is NULL it will return you the value NULL. DECLARE @p GEOMETRY = 'Polygon((2 2, 3 3, 4 4, 5 5, 6 6, 2 2))' SELECT @p.ISNULL ObjIsNull GO DECLARE @p GEOMETRY = NULL SELECT @p.ISNULL ObjIsNull GO 2) Using IsValidDetailed Function IsValidateDetails function validates if the object is valid or not. If the object is valid it will return 24400: Valid but if the object is not valid it will give message with the error number. In case object is NULL it will return the value as NULL. DECLARE @p GEOMETRY = 'Polygon((2 2, 3 3, 4 4, 5 5, 6 6, 2 2))' SELECT @p.IsValidDetailed() IsValid GO DECLARE @p GEOMETRY = NULL SELECT @p.IsValidDetailed() IsValid GO When to use what? Now you can see that there are two different ways to validate the NULL values. I personally have no preference about using one over another. However, there is one clear difference between them. In case of the IsValidDetailed Function the return value is nvarchar(max) and it is not always possible to compare the value with nvarchar(max). Whereas the ISNULL function returns the bit value of 0 when the object is null and it is easy to determine if the object is null or not in the case of ISNULL function. Additionally, ISNULL function does not check if the object is valid or not and will return the value 0 if the object is not NULL. Now you know even though either of the function can be used in place of each other both have very specific use case. Use the one which fits your business case. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: PostADay, SQL, SQL Authority, SQL Function, SQL Query, SQL Server, SQL Tips and Tricks, T SQL, Technology Tagged: Spatial Database, SQL Spatial

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  • Convert your Hash keys to object properties in Ruby

    - by kerry
    Being a Ruby noob (and having a background in Groovy), I was a little surprised that you can not access hash objects using the dot notation.  I am writing an application that relies heavily on XML and JSON data.  This data will need to be displayed and I would rather use book.author.first_name over book[‘author’][‘first_name’].  A quick search on google yielded this post on the subject. So, taking the DRYOO (Don’t Repeat Yourself Or Others) concept.  I came up with this: 1: class ::Hash 2:  3: # add keys to hash 4: def to_obj 5: self.each do |k,v| 6: if v.kind_of? Hash 7: v.to_obj 8: end 9: k=k.gsub(/\.|\s|-|\/|\'/, '_').downcase.to_sym 10: self.instance_variable_set("@#{k}", v) ## create and initialize an instance variable for this key/value pair 11: self.class.send(:define_method, k, proc{self.instance_variable_get("@#{k}")}) ## create the getter that returns the instance variable 12: self.class.send(:define_method, "#{k}=", proc{|v| self.instance_variable_set("@#{k}", v)}) ## create the setter that sets the instance variable 13: end 14: return self 15: end 16: end This works pretty well.  It converts each of your keys to properties of the Hash.  However, it doesn’t sit very well with me because I probably will not use 90% of the properties most of the time.  Why should I go through the performance overhead of creating instance variables for all of the unused ones? Enter the ‘magic method’ #missing_method: 1: class ::Hash 2: def method_missing(name) 3: return self[name] if key? name 4: self.each { |k,v| return v if k.to_s.to_sym == name } 5: super.method_missing name 6: end 7: end This is a much cleaner method for my purposes.  Quite simply, it checks to see if there is a key with the given symbol, and if not, loop through the keys and attempt to find one. I am a Ruby noob, so if there is something I am overlooking, please let me know.

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  • Keyboard layout - certain keys work with AltGr, other doesn't

    - by user23122
    I run Ubuntu 12.04 in VirtualBox 4.3.14 on Windows 7 with a Swedish keyboard layout. In Windows everything works fine but in Ubuntu some keys/characters (the most important for a programmer) doesn't work. This is the result from pressing the keys in the top row 1234567890+´ (Unmodified top row on keyboard) @£$€ {[]}\ (Windows with AltGr) ¡ £$€¥ ± (Ubuntu with "AltGr") More characters are broken (pipe | is a notable example) but the top row is the biggest problem. I can workaround this by enabling "direct connection" from my USB keyboard to VirtualBox but then I have to manually disable that every time I switch out of VirtualBox. I have tried different keyboard layout, sometimes @ et al works but then other characters are broken. I also tried sudo dpkg-reconfigure keyboard-configuration with default values, but it didn't change anything. I have guest additions installed (from the built in virtual CD). I got my VB disk image from a colleague who does not have this problem, however, he does not have guest additions installed (and hence can't use a higher resolution than 1024x768, and I need to run Ecplipse...). He also have different installation of Virtual Box and Windows. For example, the key for 2 should, in Ubuntu, produce four different characters, 2"²@. The first three works fine, including superscript 2 that requires AltGr-Shift-2, it is just plain AltGr-2 to get @ that does not work on this key (and all the other keys I have problem with). Any ideas for a fix?

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  • Loading a class into a function ?

    - by Adrian
    I`m currently working on a script, and I have the following situation. function somnicefunction() { require 'someexternalclass.php'; $somevar = new SomeExternalClass(); } For some reason, the above breaks the function. I'm not sure why, I haven't seen much documentation in php.net regarding this, plus google returned no real results. Does anyone have any idea ?

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  • how to use a bash function defined in your .bashrc with find -exec

    - by sharrajesh
    my .bashrc has the following function function myfile { file $1 } export -f myfile it works fine when i call it directly rajesh@rajesh-desktop:~$ myfile out.ogv out.ogv: Ogg data, Skeleton v3.0 it does not work when i try to invoke it through exec rajesh@rajesh-desktop:~$ find ./ -name *.ogv -exec myfile {} \; find: `myfile': No such file or directory is there a way to call bash script functions with exec? Any help is greatly appreciated. Thanks, sharrajesh

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  • elisp macro to write function?

    - by aaa
    hello I have written few functions, which nearly identical, save for names. For example ; x is name, such as function/paragraph/line/etc. (defun my-x-function (interactive) (mark-x) (do-more-stuff) (modify-x)) is there a way to put it automatically? I have a feeling this is what macros do, but I am not sure how to use them. you help/maybe small example would be great Thanks

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