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  • Checking for Value in JS Object

    - by pagewil
    I have a JS Object like so: var ob{ 1 : { id:101, name:'john', email:'[email protected]' }, 2 : { id:102, name:'jim', email:'[email protected]' }, 3 : { id:103, name:'bob', email:'[email protected]' }, } I want to check if this JS object already contains a record. If it doesn't then I want to add it. For example. if(ob contains an id of 101){ //don't add john }else{ //add john } Catch my drift? Pretty simple question. I just want to know the best way of doing it. Thanks Guys! W.

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  • Equivalent of public static final fields in Scala

    - by JT
    I'm learning Scala, and I can't figure out how to best express this simple Java class in Scala: public class Color { public static final Color BLACK = new Color(0, 0, 0); public static final Color WHITE = new Color(255, 255, 255); public static final Color GREEN = new Color(0, 0, 255); private static final int red; private static final int blue; private static final int green; public Color(int red, int blue, int green) { this.red = red; this.blue = blue; this.green = green; } // getters, et cetera } The best I have is the following: class Color(val red: Int, val blue: Int, val green: Int) object BLACK extends Color(0, 0, 0) object WHITE extends Color(255, 255, 255) object GREEN extends Color(0, 0, 255) But I lose the advantages of having BLACK, WHITE, and GREEN being tied to the Color namespace.

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  • Rewrite probabilities as boolean algebra

    - by Magsol
    I'm given three binary random variables: X, Y, and Z. I'm also given the following: P(Z | X) P(Z | Y) P(X) P(Y) I'm then supposed to determine whether or not it is possible to find P(Z | Y, X). I've tried rewriting the solution in the form of Bayes' Theorem and have gotten nowhere. Given that these are boolean random variables, is it possible to rewrite the system in terms of boolean algebra? I understand that the conditionals can be mapped to boolean implications (x -> y, or !x + y), but I'm unsure how this would translate in terms of the overall problem I'm trying to solve. (yes, this is a homework problem, but here I'm much more interested in how to formally solve this problem than what the solution is...I also figured this question would be entirely too simple for MathOverflow)

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  • jquery scrollTo refuses to work

    - by hasan
    hey, ive read all the scrollTo questions and couldnt find the answer. im trying to use the scrollTo plugin for a simple horizontal scroll (the site is horizontally designed). im using the following code $(document).ready(function() { $('#contactlink').click(function(){ $.scrollTo("#conta", {duration: 8000 }); }); }); as is obvious, contactlink is the anchor link while conta is the anchor where the window should scroll to. i know im missing something very obvious, but as im a beginner with jquery, id appreciate all the help i can get. is there any way to debug the functioning of the plugin? thanks

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  • .net c# text box date with mask - setup

    - by flavour404
    I have a c# .net project and want an input text box for a date value. I want it to display a default value of mm/dd/yyyy and then allow users to enter valid dates. I have tried using a masked text box but it doesn't like having the above format. If i try and use //__ looks naff and so does 00/00/0000 and of course if you put in '0' like 03/11/2009 you get 3/11/29 because the 0's are deleted as part of the mask - so what is the best way to set up an input box like this, effectively with a mask, only allowing numbers, and validation (though at this point I am not so worried about that). This seems so simple and isn't. Thanks, R.

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  • Databinding to type double - decimal mark lost

    - by user1277327
    I have a project where I'm databinding a gridview to a list, where one column is databound to a gridview. The problem I have is that with the double being 5.5 on one computer it appears as 5.5 in the gridview. But on another it looks like 55, the decimal mark dissapears. So 3.14 will look like 314 etc. The error occurs with the following code: myDatagrid.ItemsSource = someList; Binding binding = new Binding("DoubleValue"); myColumnInDatagrid.Binding = binding; I've also tried using a very simple valueconverter, that just return the double, and parsed it in ConvertBack. I'm pretty new to WPF so I'm sorry if I've made some obvious mistakes, I just don't understand why it works on one computer but not on the other. Perhaps it should be noted that both of the computers use the same operating system, with the same language settings (afaik at least).

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  • Batch files - number of command line arguments

    - by pyko
    Just converting some shell scripts into batch files and there is one thing I can't seem to find...and that is a simple count of the number of command line arguments. eg. if you have: myapp foo bar In Shell: $# - 2 $* - foo bar $0 - myapp $1 - foo $2 - bar In batch ?? - 2 <---- what command?! %* - foo bar %0 - myapp %1 - foo %2 - bar So I've looked around, and either I'm looking in the wrong spot or I'm blind, but I can't seem to find a way to get a count of number of command line arguments passed in. Is there a command similar to shell's "$#" for batch files? ps. the closest i've found is to iterate through the %1s and use 'shift', but I need to refernece %1,%2 etc later in the script so that's no good.

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  • Algorithmic trading software safety guards

    - by Adal
    I'm working on an automatic trading system. What sorts of safe-guards should I have in place? The main idea I have is to have multiple pieces checking each other. I will have a second independent little process which will also connect to the same trading account and monitor simple things, like ensuring the total net position does not go over a certain limit, or that there are no more than N orders in 10 minutes for example, or more than M positions open simultaneously. You can also check that the actual open positions correspond to what the strategy process thinks it actually holds. As a bonus I could run this checker process on a different machine/network provider. Besides the checks in the main strategy, this will ensure that whatever weird bug occurs, nothing really bad can happen. Any other things I should monitor and be aware of?

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  • Voting software with remote units - architectural questions

    - by David Neale
    I'm looking at designing some software that registers live votes (let's say A,B,C or D). The vote needs to be picked up and processed by a .NET engine. The remote voting units should be as small as possible. What form of data transmission should be used for the voting? The data is obviously very simple but there is a need to make sure each unit can only vote once per question. How would the data be received by the computer running the software?

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  • using sqlite3 with lua

    - by mr calendar
    I'm trying to use sqlite3 with lua (am already using c++, but I'm a n00b with lua- I read this) but I'm getting the following when trying to build the library or whatever: C:\lib\lsqlite3-7>mingw32-make process_begin: CreateProcess(NULL, pkg-config --version, ...) failed. makefile:53: *** windows32. Stop. I'm not at all surprised at a makefile failing but I can't do them (is it spaces or tabs? where is it they have to go?), I would have thought there was a binary for windows? Any simple answers appreciated. I haven't got the time to learn make or install cygwin or whatever.

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  • Java based Atom/RSS Library that works in Google App Engine

    - by Littlejon
    I am trying to publish an Atom/RSS feed in my Java based Google App Engine code. I have tried using Rome and keep getting the following error (tried googling without success), also the code I am running that generates the error is the demo code (so I get the feeling Rome won't work with GAE) java.lang.NoClassDefFoundError: org/jdom/JDOMException at com.sun.syndication.io.SyndFeedOutput.<init>(SyndFeedOutput.java:44) What I am looking for is recommendations for a simple Java library to create and publish an Atom feed from within Google App Engine. Thanks.

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  • MySQL query cache vs caching result-sets in the application layer

    - by GetFree
    I'm running a php/mysql-driven website with a lot of visits and I'm considering the possibility of caching result-sets in shared memory in order to reduce database load. However, right now MySQL's query cache is enabled and it seems to be doing a pretty good job since if I disable query caching, the use of CPU jumps to 100% immediately. Given that situation, I dont know if caching result-sets (or even the generated HTML code) locally in shared memory with PHP will result in any noticeable performace improvement. Does anyone out there have any experience on this matter? PS: Please avoid suggesting heavy-artillery solutions like memcached. Right now I'm looking for simple solutions that dont require too much time to implement, deploy and maintain.

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  • How do I set a VB.Net ComboBox default value

    - by Mr Ed
    I can not locate the correct method to make the first item in a combo box visible. The app starts with an empty combo box. The user makes a radio box selection then clicks Go! (how original). The combo box is loaded via an LDAP query. All this is working just fine. The problem is the combo box still appears to the user to be empty. They must click the arrow to see the options. How do I make the first option 'visible' after the users clicks Go!? I thought it would be simple... Thanks, Ed

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  • How can developers use a similar tracking link to Google's results page?

    - by Peter Jones
    I've read heaps of pages of people trying to implement some kind of tracking system similar to the way Google reroutes search link. Eg: Search "Facebook" in Google, open in a new window, and the link changes to something like: "http://www.google.com.au/url?sa=t&source=web&cd=1&ved=0CBkQFjAA&url=http%3A%2F%2Fwww.facebook.com%2F&rct=j&q=Facebook&ei=sksZTZexJobJccXnxZYK&usg=AFQjCNHTTNi-O4Qgrg6kvGVfKJuRqbuOKw&cad=rja" I'm guessing Google tracks that click and then redirects to the actual site by reading the url parameter. What I wanted to know is if there was a simple way that you can make this kind of functionality work using an onclick event - just change the link href after being clicked to redirect? There's a few threads, but from what I could find, nobody has actually succeeded without problems or limitations. Thanks in advance.

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  • Java: using endpoint to publish webservice to tomcat server

    - by Will
    hi all, i am creating a simple SOAP web service. i am to ensure that it runs on a tomcat web service. im trying to implement this with JAX-WS (see code) my question is: does the Endpoint.publish use the tomcat server to host this or is it a mini glassfish kind of server? should i be extending UnicastRemoveObject or something similiar instead? ideally it would be able to be packaged into a .WAR and dropped in the directory and just work. It doesn't seem to work with my installed tomcat server as is because it says the port is already in use. I'm using Ubuntu karmic with the tomcat6 package installed, it could also be my user doesnt have permissions to publish to the running tomcat on 8080 i hope this question is clear enough sample code: @WebService public class UserAttributes { public static void main(String[] args) { UserAttributes instance = new UserAttributes(); Endpoint.publish("http://localhost:8082/WebServices/userattributes", instance); } public string Hello() { return "Hello World"; } }

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  • Writing a search engine

    - by wvd
    Hello all, The title might be a bit misleading, but I couldn't figure out a better title. I'm writing a simple search engine which will search on several sites for the specific domain. To be concrete: I'm writing a search engine for hardstyle livesets/aftermovies/tracks. To do I will search on the sites who provide livesets, tracks, and such. The problem here is speed, I need to pass the search query to 5-7 sites, get the results and then use my own algorithm to display the results in a sorted order. I could just "multithread" it, but it's easier said then done so I have a few questions. What would be the best solution to this problem? Should I just multithread/process this application, so I'm going to get a bit of speed-up? Are there any other solutions or I am doing something really wrong? Thanks, William van Doorn

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  • print customized result in prolog

    - by Allan Jiang
    I am working on a simple prolog program. Here is my problem. Say I already have a fact fruit(apple). I want the program take a input like this ?- input([what,is,apple]). and output apple is a fruit and for input like ?-input([is,apple,a,fruit]) instead of default print true or false, I want the program print some better phrase like yes and no Can someone help me with this? My code part is below: input(Text) :- phrase(sentence(S), Text), perform(S). %... sentence(query(Q)) --> query(Q). query(Query) --> ['is', Thing, 'a', Category], { Query =.. [Category, Thing]}. % here it will print true/false, is there a way in prolog to have it print yes/no, %like in other language: if(q){write("yes")}else{write("no")} perform(query(Q)) :- Q.

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  • http response to GET request - working in FF not Chromium

    - by Tyler
    For fun I'm trying to write a very simple server in C. When I send this response to Firefox it prints out the body "hello, world" but with Chromium it gives me a Error 100 (net::ERR_CONNECTION_CLOSED): Unknown error. This, I believe, is the relevant code: char *response = "HTTP/1.0 200 OK\r\nVary: Accept-Encoding, Accept-Language\r\nConnection: Close\r\nContent-Type: text/plain\r\nContent-Length:20\r\n\r\nhello, world"; if(send(new_fd, response, strlen(response), 0) == strlen(response)) { printf("sent\n"); }; close(new_fd); What am I missing? Thanks!

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  • How to create a persistent connection using AS3 Sockets for a chat client

    - by Vivek
    I want to create a chat client in flash/flex for a chat server,something like a MUD/MOO client but I'm unable to create a persistent connection . I've been using the AS3 Socket class,but I'm getting disconnected from the server side,soon after the connection is made but the client still shows the 'connected' property as true .The server is asynchronous and was written in python using asyncore/asynchat, it works fine with most open source MOO/MUD clients . I tried connecting my program to a simple synchronous echo server,here both read and write worked fine with no disconnections from either side . So my question is how do I make a persistent connection with the server?

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  • Question regarding XST bitstream generation

    - by Richi
    Hi all, I have a very simple VHDL module, consisting of a few lines of code. The thing is, when I generate the bitstream, I end up with a huge bitstream. The reason for this is, I guess, that XST adds lots of extra information so that the bitstream can run standalone on a FPGA. However, for my purpose it would be interesting to see the size of the bitstream of the module alone without any extra bits and pieces, just the vaniall module alone. Is there an option in Xilinx ISE 12.1 that allows me to do that? Many thanks, Richi

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  • Add wordwrap to decoded json text

    - by Gary
    Hi, I am using a simple script on my PHP webpage to decode and output JSON as text. However, what ever I try I can't get it to wordwrap the output. $file = file_get_contents('sample.txt'); $out = (json_decode($file)); echo $out->mainText; How can I get this script to wordwrap at 600 characters without chopping words in half? If possible, can you show me the whole script please as I am slowly learning. Thanks

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  • Help with jQuery issue

    - by Espen Arnoy
    I have a simple page with a list if "items". I am allowing users to vote on these items, but I only want to allow the user to vote one per. item. Therefore i have made a jQuery script that adds a class to the items the user has voted on: if(! $(this).find(".item span").hasClass("voted")) { $(".item").hover(function() { $(this).find(".ratingbar").hide(); $(this).find(".votebar").show(); }, function() { $(this).find(".votebar").hide(); $(this).find(".ratingbar").show(); }); }; This is the script that prevents the user from voting again on the same item. $(".votebutton").click(function() { $("div#"+offerid).find(".item").addClass("voted"); } My problem is that this doesn´t work. When hovering an item, the hover function still runs even though the second script successfully added the class "voted" to the html. Why can this be?

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  • Elegant setup of Python logging in Django

    - by Parand
    I have yet to find a way of setting up Python logging with Django that I'm happy with. My requirements are fairly simple: Different log handlers for different events - that is, I want to be able to log to different files Easy access to loggers in my modules. The module should be able to find its logger with little effort. Should be easily applicable to command-line modules. Parts of the system are stand-alone command line or daemon processes. Logging should be easily usable with these modules. My current setup is to use a logging.conf file and setup logging in each module I log from. It doesn't feel right. Do you have a logging setup that you like? Please detail it: how do you setup the configuration (do you use logging.conf or set it up in code), where/when do you initiate the loggers, and how do you get access to them in your modules, etc.

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  • Refresh backend in GWT development

    - by T.K.
    I am developing a GWT application that uses EJB and other Java EE 6 technology as the backend. I am currently using the GWT 2.0 plugin for Safari. When I change my GWT client side code and save in my IDE (NetBeans), all that's required is a simple reload in the browser for the changes to become active. That works great! However, often I work on the server-side (the EJBs, GWT server code, etc) and then something in on the GWT client side. Any changes done to the server-side do not appear to incrementally deploy to the Glassfish V3 server. Currently I close the GWT Development Mode application, and then recompile the EJBs, and then go back into GWT Development mode. That is tedious. Any better way of doing this? I tried the "deploy on save" option in NetBeans but it does not seem to do the trick.

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  • Get the selected option id with jQuery

    - by Itamar Bar-Lev
    Hi, I'm trying to use jQuery to make an ajax request based on a selected option. Is there a simple way to retrieve the selected option id (e.g. "id2") using jQuery? <select id="my_select"> <option value="o1" id="id1">Option1</option> <option value="o2" id="id2">Option2</option> </select> $("#my_select").change(function() { //do something with the id of the selected option });

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