semicolon in css..
- by jitendra
if IDE by default adding ; at end. should i remove?
selector {property:value;property:value;property:value;property:value;}
I read on an article semicolon not required at end.
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Proc.new vs Lambda in Ruby
- by piemesons
Plese check this: def foo f = Proc.new { return "return from foo from inside proc" } f.call # control leaves foo here return "return from foo" end def bar f = lambda { return "return from lambda" } f.call # control does not leave bar here return "return from bar" end puts foo # prints "return from foo from inside proc" puts bar # prints "return from bar" Can anybody tell me what lambda is and what is Proc and whats the difference.Read the article
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Creating relationship between two model instances
- by Lowgain
This is probably pretty simple, but here: Say I've got two models, Thing and Tag class Thing < ActiveRecord::Base has_and_belongs_to_many :tags end class Tag < ActiveRecord::Base has_and_belongs_to_many :things end And I have an instance of each. I want to link them. Can I do something like: @thing = Thing.find(1) @tag = Tag.find(1) @thing.tags.add(@tag) If not, what is the best way to do this? Thanks!Read the article
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How to get the path of app(without app.exe)?
- by iPhoney
I want to get the path of my app like: "\\ProgramFiles\\myApp", I try to use the following code: string path = System.Reflection.Assembly.GetExecutingAssembly().GetName().CodeBase; But it returns a path which has "\\myapp.exe" at the end. I also tried: string path = System.IO.Directory.GetCurrentDirectory(); But it throws an “NotSupportedException”. Is there any way to get a path without .exe at the end?Read the article
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What software licesnse should I release my code under?
- by Citizen
We're about to finish some free software and we're not sure what license we should release it under. Here's the details: The software is funded by several sponsors The software is open source The software will be free to download by the end-user The software will be free to use and modify for personal and commercial use by the end-user We want to retain ownership of the code We don't want anyone else to distribute our product What software license should we use?Read the article
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Detecting Enter KeyPress on VB.NET 2008
- by Tareq
I am using 3.5 framework of VB.NET 2008. I have some textboxes in my form. I want the tab like behavior when my user presses ENTER on one of my textboxes. I used the following Code: Private Sub txtDiscount_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtDiscount.KeyPress If e.KeyChar = Microsoft.VisualBasic.ChrW(Keys.Return) Then SendKeys.Send("{TAB}") e.Handled = True End If End Sub But It doen't work for me. Please give me a solution.Read the article
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VB.Net Linq Datatable Exists
- by LarsH
I would like to use Linq instead of below function : Friend Function IsCollectionInTable2(ByVal apps As DataTable, ByVal collectionId As String) As Boolean For Each row As DataRow In apps.Rows If row("CollectionId").ToString = collectionId Then Return True Next Return False End Function The best I can do is below: Friend Function IsCollectionInTable(ByVal apps As DataTable, ByVal collectionId As String) As Boolean Return (From row In apps.AsEnumerable() Where (row.Field(Of String)("CollectionId") = collectionId) Select row.Field(Of String)("CollectionId")).Count > 0 End Function I would like to use Exists or Any in above function. Performance could be an issue,Read the article
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Evaluating and graphing functions in Matlab
- by thiol3
New to programming, I am trying to graph the following Gaussian function in Matlab (should graph in 3 dimensions) but am making some mistakes somewhere. What is wrong? sigma = 1 for i = 1:20 for j = 1:20 z(i,j) = (1/(2*pi*sigma^2))*exp(-(i^2+j^2)/(2*sigma^2)); end end surf(z)Read the article
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Format form fields for bootstrap using rails+nokogiri
- by user1116573
I have the following in an initializer in a rails app that uses Twitter bootstrap so that it removes the div.field_with_errors that rails applies when validation fails on a field but also the initializer adds the help/validation text after the erroneous input field: require 'nokogiri' ActionView::Base.field_error_proc = Proc.new do |html_tag, instance| html = %(<div class="field_with_errors">#{html_tag}</div>).html_safe form_fields = [ 'textarea', 'input', 'select' ] elements = Nokogiri::HTML::DocumentFragment.parse(html_tag).css("label, " + form_fields.join(', ')) elements.each do |e| if e.node_name.eql? 'label' html = %(#{e}).html_safe elsif form_fields.include? e.node_name if instance.error_message.kind_of?(Array) html = %(#{e}<span class="help-inline"> #{instance.error_message.join(',')}</span>).html_safe else html = %(#{e}<span class="help-inline"> #{instance.error_message}</span>).html_safe end end end html end This works fine but I also need to apply the .error class to the surrounding div.control-group for each error. My initializer currently gives the following output: <div class="control-group"> <label class="control-label" for="post_message">Message</label> <div class="controls"> <input id="post_message" name="post[message]" required="required" size="30" type="text" value="" /><span class="help-inline"> can't be blank</span> </div> </div> but I need something adding to my initializer so that it adds the .error class to the div.control-group like so: <div class="control-group error"> <label class="control-label" for="post_message">Message</label> <div class="controls"> <input id="post_message" name="post[message]" required="required" size="30" type="text" value="" /><span class="help-inline"> can't be blank</span> </div> </div> The solution will probably need to allow for the fact that each validation error could have more than one label and input that are all within the same div.control-group (eg radio buttons / checkboxes / 2 text fields side by side). I assume it needs some sort of e.at_xpath() to find the div.control-group parent and add the .error class to it but I'm not sure how to do this. Can anyone help? PS This may all be possible using the formtastic or simple_form gems but I'd rather just use my own html if possible. EDIT If I put e['class'] = 'foo' in the if e.node_name.eql? 'label' section then it applies the class to the label so I think I just need to find the parent tag of e and then apply an .error class to it but I can't figure out what the xpath would be to get from label to its div.control-group parent; no combination of dots, slashes or whatever seems to work but xpath isn't my strong point.Read the article
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How to use rails routes in external classes?
- by wesgarrison
I'm using prawn to generate pdfs, set up ala http://wiki.github.com/sandal/prawn/using-prawn-in-rails I'd like to access my routes so I can generate links in my pdfs, but now I'm not in a template like I used to do with prawnto, so I don't have access to the named routes. class MyPdf < Prawn::Document def to_pdf text root_path end end How can I include my named routes?Read the article
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how to work with datagridview if need show many columns data (approx 1Mio)
- by ruprog
is a problem to display data in Datagridview. A large amount of data (stock quotes) data to be displayed from left to right Tell me what to do to display an array of data in datagridviev Public dat As New List(Of act) Public Class act Public time As Date Public price As Integer End Class Sub work() Dim r As New Random For x As Integer = 0 To 1000000 Dim el As New act el.time = Now el.price = r.Next(0, 1000) dat.Add(New act) Next End SubRead the article
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How to change last letter of filename to lowercase if it is a letter?
- by Robert Buckley
I have been given data which cannot be interpreted by my software unless it has a lowercase letter at the end. The data was delivered with an uppercase letter at the end. Somehow I need to first recursively loop through all folders and find whether the filename ends with a letter and then change it to lowercase. I think python could do this, but I don´t know how,. Any help would be great! yours, RobRead the article
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Matlab regex if statement
- by Dan
I want to have matlab take user input but accept both cases of a letter. For example I have: function nothing = checkGC(gcfile) if exist(gcfile) reply = input('file exists, would you like to overwrite? [Y/N]: ', 's'); if (reply == [Yy]) display('You have chosen to overwrite!') else $ Do nothing end end The if statement obviously doesn't work, but basically I want to accept a lowercase or uppcase Y. Whats the best way to do this?Read the article
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Can I have a CASE statement within a WHILE loop?
- by John
This is what I'm doing: while (@counter < 3 and @newBalance >0) begin CASE when @counter = 1 then ( @monFee1 = @monthlyFee, @newBalance = @newBalance-@fee) when @counter = 2 then ( @monFee2 = @monthlyFee, @newBalance = @newBalance-@fee) END @counter = @counter +1 end I get this error: Incorrect syntax near the keyword 'CASE'. No idea why. Please help!Read the article
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how can I generate json from respond_to method in rails?
- by Oberon Dude
If I have a block of code like this: def show @post = Post.find(params[:id]) respond_to do |format| format.html # show.html.erb format.xml { render :xml => @post } end end How do I add something like format.json Any tips, pointers, ideas gladly welcomed...Read the article
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SQLServer - Test the result of a stored procedure
- by Melursus
In Microsoft SQLServer, it is possible to test the result of a stored procedure to know if the result return rows or nothing ? Example : EXEC _sp_MySp 1, 2, 3 IF @@ROWCOUNT = 0 BEGIN PRINT('Empty') END ELSE BEGIN PRINT(@@ROWCOUNT) END But @@ROWCOUNT always return 0 so maybe is there another way of doing this ?Read the article
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Handler call error in tell block in Applescript
- by Dmitry
Why a handler is not called within the tell block? Error is -1708 on stub() -- method is not called in tell block end stub tell application "Finder" stub() end tellRead the article
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Authlogic's current_user object in models
- by jriff
Hi all! I need to know the ID of the current user in a model: def after_save desc, points=nil, nil if answer_index == daily_question.correct_answer_index desc = I18n.t('daily_question.point_log.description.correct') points=daily_question.points else desc = I18n.t('daily_question.point_log.description.incorrect') end current_user.give_points(:description => desc, :points => points ) end But I guess that is not how it is done? Regards, JacobRead the article
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In asp classic: How can I make sure that a variable can be cast as an int?
- by Tchalvak
The following function was suggested to me: ' Defines a forced casting function, which "casts" anything that it can't detect as a number to zero. Function MakeInteger(val) If IsNumeric(val) Then MakeInteger = CInt(val) Else MakeInteger = 0 End If End Function Unfortunately there appear to be some things that return true for IsNumeric() but still can't be cast as an int. Is there any better check to use?Read the article
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simple proof that GUID is not unique
- by Kai
I'd like to prove that a GUID is not unique in a simple test program. I expected this to run for hours but it's not working. How can I make it work? BigInteger begin = new BigInteger((long)0); BigInteger end = new BigInteger("340282366920938463463374607431768211456",10); //2^128 for(begin; begin<end; begin++) Console.WriteLine(System.Guid.NewGuid().ToString()); I'm using C#Read the article
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C++ compilation error when passing a function into remove_if
- by garsh0p
So here's a snippet of my code. void RoutingProtocolImpl::removeAllInfinity() { dv.erase(std::remove_if(dv.begin(), dv.end(), hasInfCost), dv.end()); } bool RoutingProtocolImpl::hasInfCost(RoutingProtocolImpl::dv_entry *entry) { if (entry-link_cost == INFINITY_COST) { free(entry); return true; } else { return false; } } I'm getting the following error when compiling: RoutingProtocolImpl.cc:368: error: argument of type bool (RoutingProtocolImpl::)(RoutingProtocolImpl::dv_entry*)' does not matchbool (RoutingProtocolImpl::*)(RoutingProtocolImpl::dv_entry*)' Sorry, I'm kind of a C++ newb.Read the article
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undefined method `parameterize' for nil:NilClass
- by Senthil
I've been trying to do SEO friendly urls, and managed to get it work, but when I call index action on blogs, I get a weird "undefined method `parameterize' for nil:NilClass." The method works when using show method. def to_s title end def to_param "#{id}-#{to_s.parameterize}" endRead the article
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Rails: url_for to be available in a isolated class that must be instanced
- by Totty
Rails: url_for to be available in a isolated class that must be instanced: class ProfilePresenter < ActionController::Base attr_reader :profile def initialize(profile) super @a = url_for(:controller => 'profiles', :action => 'view', :profile_url => 'dd') @a @profile = profile end end How to make the url_for work? i tried to extend the ActionController::Base and the ActionView::Base and i cant :sRead the article
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How to write a Python 2.6+ script that does gracefully fail with older pyhton?
- by Sorin Sbarnea
I'm using the new print from Python 3.x and I observed that the following code does not compile due to the end=' '. from __future__ import print_function import sys if sys.hexversion < 0x02060000: raise Exception("py too old") ... print("x",end=" ") # fails to compile with py24 How can I continue using the new syntax but make the script fails nicely? Is it mandatory to call another script and use only safe syntax in this one?Read the article
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Ruby proc vs lambda in initialize()
- by Jimmy Chu
I found out this morning that proc.new works in a class initialize method, but not lambda. Concretely, I mean: class TestClass attr_reader :proc, :lambda def initialize @proc = Proc.new {puts "Hello from Proc"} @lambda = lambda {puts "Hello from lambda"} end end c = TestClass.new c.proc.call c.lambda.call In the above case, the result will be: Hello from Proc test.rb:14:in `<main>': undefined method `call' for nil:NilClass (NoMethodError) Why is that? Thanks!Read the article
