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• Creating a webserver from scratch

  - by Val

  I know this is going to sound a humongous task and many of you would think why in the world would you want to do so or why re-invent the wheel. However I just want a project I can work on the side see how it goes and experiment ( I got a thirst for learning something new and this is a great challenge). Question Where would I start creating a server-side scripting like php, asp and (now) node.js I would like to have a few examples, and most importantly a CODEX/documentation where I can learn and find out more how it works. I guess I am asking for directions where to go to read and find out more about this. Many thanks,

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• Undefined / Uninitialized default values in a class

  - by Jir

  Let's suppose you have this class: class A { public: A () {} A (double val) : m_val(val) {} ~A () {} private: double m_val; }; Once I create an instance of A, how can I check if m_val has been initialized/defined? Put it in other words, is there a way to know if m_val has been initialized/defined or not? Something along the lines of the defined operator in Python, I suppose. (But correct me if I'm wrong.) I thought of modifying the class and the c-tors the following way: class A { public: A () : defined(false) {} A (double val) : m_val(val), defined(true) {} ~A () {} private: double m_val; bool defined; }; How do you rate this solution? Any suggestion? TIA, Chris

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• WPF TextBox value doesn't change on OnPropertyChanged

  - by jpsstavares

  I have a TextBox whose Value is binded to a ViewModel property: <TextBox Name="txtRunAfter" Grid.Column="4" Text="{Binding Mode=TwoWay, Path=RunAfter}" Style="{StaticResource TestStepTextBox}"/> The set and get were working fine until I tried to add some validation when the Value is set: private int _runAfter = 0; public string RunAfter { get { return _runAfter.ToString(); } set { int val = int.Parse(value); if (_runAfter != val) { if (val < _order) _runAfter = val; else { _runAfter = 0; OnPropertyChanged("RunAfter"); } } } } Although the OnPropertyChanged is reached (I have dubugged that), the View is not changed. How can I make this work? Thanks, José Tavares

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• c# Column datatype Date type (NOT DateTime)

  - by Sha Le

  Hi All: I want know is there good way to detect Column DataType for Date field (NOT DateTime)? This what currently I do: switch (dt.Columns[col].DataType.FullName) { case "System.DateTime": formatedVal = Formatter.GetDateTime(val); break; // which is NOT possible, but something equivalent am looking for case "System.Date": formatedVal = Formatter.GetDate(val); break; default: formatedVal = val.ToString(); break; } Thanks a bunch. :-)

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• Javascript & jquery : Unable to increment within a form

  - by Daniyal

  I got a simple increment function like this: $(function(){ $("#inc").click(function(){ var value = parseInt($(":text[name='ice_id']").val()) + 1; $(":text[name='ice_id']").val(value); }); $("#dec").click(function(){ var value = parseInt($(":text[name='ice_id']").val()) - 1; $(":text[name='ice_id']").val(value); }); }); the ice_id text field is embedded within a form <form id="masterSubmit" name="masterSubmit" action="" method="post"> <td><input id="ice_id" type="text" name="ice_id" size="16" maxlength="15"></td> </form> When I try now to increment , it successfully increments a number, but shows the following weird behavior: It 'refreshes' the site, so that the content of the text field is gone. This behavior disappears, if I comment out the form tags ...unfortunately the form tags are required for an AJAX-submit. Are there any ways to avoid this problem? Thanks in advance for any hints and best regards Daniyal

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• JSON datas not loaded into content page

  - by Chelseawillrecover

  I am trying to append my JSON datas into the content page but the datas are not loaded. When I use console.log I can see the data appearing. JS: $(document).on('pagebeforeshow', '#blogposts', function() { //$.mobile.showPageLoadingMsg(); $.ajax({ url: "http://howtodeployit.com/category/daily-devotion/?json=recentstories&callback=", dataType: "json", jsonpCallback: 'successCallback', async: true, beforeSend: function() { $.mobile.showPageLoadingMsg(true); }, complete: function() { $.mobile.hidePageLoadingMsg(); }, success:function(data){ $.each(data.posts, function(i, val) { console.log(val.title); $('<li/>').append([$("<h3>", {html: val.title}),$("<p>", {html: val.excerpt})]).wrapInner('<a href="#devotionpost" onclick="showPost(' + val.id + ')"></a>').appendTo('#postList'); return (i !== 4); console.log('#postlist'); }); }, error: function(data) { alert("Data not found"); } }); }); HTML: <!-- Page: Blog Posts --> <div id="blogposts" data-role="page"> <div data-role="header" data-position="fixed"> <h2>My Blog Posts</h2> </div><!-- header --> <div data-role="content"> <ul id="postlist"> </ul><!-- content --> </div> <div class="load-more">Load More Posts...</div> </div><!-- page -->

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• Memory Management with returning char* function

  - by RageD

  Hello all, Today, without much thought, I wrote a simple function return to a char* based on a switch statement of given enum values. This, however, made me wonder how I could release that memory. What I did was something like this: char* func() { char* retval = new char; // Switch blah blah - will always return some value other than NULL since default: return retval; } I apologize if this is a naive question, but what is the best way to release the memory seeing as I cannot delete the memory after the return and, obviously, if I delete it before, I won't have a returned value. What I was thinking as a viable solution was something like this void func(char*& in) { // blah blah switch make it do something } int main() { char* val = new char; func(val); // Do whatever with func (normally func within a data structure with specific enum set so could run multiple times to change output) val = NULL; delete val; val = NULL; return 0; } Would anyone have anymore insight on this and/or explanation on which to use? Regards, Dennis M.

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• jquery element click event only allowed once? confuddled

  - by claw

  One a click event of an element, it only works once. Say the value is 2 it will increase/decrease/reset only once. How to I reset the event so the user can keep clicking on the element increasing the value of the value .item-selection-amount $('.item-selection-amount').click(function(event) { var amount = $(this).val(); switch (event.which) { case 1: //set new value + $(this).val(amount + 1); break; case 2: //set new value reset $(this).val(0); break; case 3: //set new value - if(amount > 0){ $(this).val(amount - 1); } break; } }); Thanks

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• Generic object load function for scala

  - by Isaac Oates

  I'm starting on a Scala application which uses Hibernate (JPA) on the back end. In order to load an object, I use this line of code: val addr = s.load(classOf[Address], addr_id).asInstanceOf[Address]; Needless to say, that's a little painful. I wrote a helper class which looks like this: import org.hibernate.Session class DataLoader(s: Session) { def loadAddress(id: Long): Address = { return s.load(classOf[Address], id).asInstanceOf[Address]; } ... } So, now I can do this: val dl = new DataLoader(s) val addr = dl loadAddress(addr_id) Here's the question: How do I write a generic parametrized method which can load any object using this same pattern? i.e val addr = dl load[Address](addr_id) (or something along those lines.) I'm new to Scala so please forgive anything here that's especially hideous.

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• How do I make a word bold in javascript?

  - by user54197

  I am using javascript to populate data in a table which return everything fine. I would like to make a string bold. See code below $tr.find('.data').val($('#txtName').val() + ' <strong>Address:<\/strong> ' + $('#txtAddress').val()); How do I make only the word "Address" bold?

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• C++ class functions calling fortran subroutine

  - by user2863626

  Okay so I am trying to make my code work. It is a simple C++ program with a class "CArray". This class has 2 properties, the array size, and the value. I want the main C++ program to create two instances of the class CArray. In the class CArray, I have a function called "AddArray( CArray )" where it adds another array to the current array. The problem I am stuck with, is that I want the function "AddArray" to add the two arrays in fortran. I know, much more complicated, but that is what I need. I am having issues with linking the two inside the class code. #include <iostream> using namespace std; class CArray { public: CArray(); ~CArray(); int Size; int* Val; void SetSize( int ); void SetValues(); void GetArray(); extern "C" { void Add( int*, int*, int*, int*); void Subtract( int*, int*, int*, int*); void Muliply( int*, int*, int *, int* ); } void AddArray( CArray ); void SubtractArray( CArray ); void MultiplyArray( CArray ); }; Also here is the CArray function file. #include "Array.h" #include <iostream> using namespace std; CArray::CArray() { } CArray::~CArray() { } void CArray::SetSize( int s ) { Size = s; for ( int i=0; i<s; i++ ) { Val = new int[Size]; } } void CArray::SetValues() { for ( int i=0; i<Size; i++ ) { cout << "Element " << i+1 << ": "; cin >> Val[i]; } } void CArray::GetArray() { for ( int i=0; i<Size; i++ ) { cout << Val[i] << " "; } } void CArray::AddArray( CArray a ) { if ( Size == a.Size ) { Add(&Val, &a.Val); } else { cout << "Array dimensions do not agree!" << endl; } } void CArray::SubtractArray( CArray a ) { Subtract( &Val, &a, &Size, &a.Size); GetArray(); } Here is my Fortran code. module SubtractArrays use ico_c_binding implicit none contains subroutine Subtract(a,b,s1,s2) bind(c,name='Subtract') integer s1,s2 integer a(s1),b(s2) if ( s1.eq.s2 ) do i=1,s1 a(i) = a(i) - b(i) end return end end If someone could just help me with setting me up to send arrays of integers from C++ classes to fortran I would greatly appreciate it! Thank you, Josh Derrick

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• Error when using jquery webservice call to populate dropdownlist

  - by bugz

  For some reason when i tested parsing a json string to a dropdownlist it worked doing this var json = [{ "Id": "12345", "WorkUnitId": "SR0001954", "Description": "Test Service Request From Serena", "WorkUnitCategory": "ServiceRequest" }, { "Id": "12355", "WorkUnitId": "WOR001854", "Description": "Test Work Order From Serena", "WorkUnitCategory": "ServiceRequest" }, { "Id": "12365", "WorkUnitId": "DBR001274", "Description": "Test Database Related Service Request From Serena", "WorkUnitCategory": "ServiceRequest"}]; $(json).each(function() { comboboxWorkUnit.append($('<option>').val(this.Id).text(this.WorkUnitId)); }); However when i tryed taking the json from my webservice and placing it into the dropdownlist i get an error saying the dropdownlist doesnt support this metod. $.ajax({ type: "POST", url: "Services/WorkUnitService.asmx/WorkUnit", data: "{'Number' : '" + Number.text() + "','Id': '" + combobox.val() + "','workerType': '" + EmployeeType + "'}", contentType: "application/json; charset=utf-8", dataType: "json", success: function(json) { $(json).each(function() { comboboxWorkUnit.append($('<option>').val(this.Id).text(this.WorkUnitId)); }); } }); I also tried which called the webservice method but through an error $.postJSON("Services/WorkUnitService.asmx/WorkUnitsForParAndPhase", "{'parNumber' : '" + parNumber + "','phaseId': '" + combobox.val() + "','workerType': '" + EmployeeType + "'}", function(data) { alert(data.toString()); }); And i tryed this which never called the webservice $.getJSON('Services/WorkUnitService.asmx/WorkUnitsForParAndPhase' + parNumber + '/' + combobox.val() + '/' + EmployeeType, function(myData) { alert(myData.toString()); });

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• smarter "reverse" of a dictionary in python (acc for some of values being the same)?

  - by mrkafk

  def revert_dict(d): rd = {} for key in d: val = d[key] if val in rd: rd[val].append(key) else: rd[val] = [key] return rd >>> revert_dict({'srvc3': '1', 'srvc2': '1', 'srvc1': '2'}) {'1': ['srvc3', 'srvc2'], '2': ['srvc1']} This obviously isn't simple exchange of keys with values: this would overwrite some values (as new keys) which is NOT what I'm after. If 2 or more values are the same for different keys, keys are supposed to be grouped in a list. The above function works, but I wonder if there is a smarter / faster way?

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• How to find same-value rectangular areas of a given size in a matrix most efficiently?

  - by neo

  My problem is very simple but I haven't found an efficient implementation yet. Suppose there is a matrix A like this: 0 0 0 0 0 0 0 4 4 2 2 2 0 0 4 4 2 2 2 0 0 0 0 2 2 2 1 1 0 0 0 0 0 1 1 Now I want to find all starting positions of rectangular areas in this matrix which have a given size. An area is a subset of A where all numbers are the same. Let's say width=2 and height=3. There are 3 areas which have this size: 2 2 2 2 0 0 2 2 2 2 0 0 2 2 2 2 0 0 The result of the function call would be a list of starting positions (x,y starting with 0) of those areas. List((2,1),(3,1),(5,0)) The following is my current implementation. "Areas" are called "surfaces" here. case class Dimension2D(width: Int, height: Int) case class Position2D(x: Int, y: Int) def findFlatSurfaces(matrix: Array[Array[Int]], surfaceSize: Dimension2D): List[Position2D] = { val matrixWidth = matrix.length val matrixHeight = matrix(0).length var resultPositions: List[Position2D] = Nil for (y <- 0 to matrixHeight - surfaceSize.height) { var x = 0 while (x <= matrixWidth - surfaceSize.width) { val topLeft = matrix(x)(y) val topRight = matrix(x + surfaceSize.width - 1)(y) val bottomLeft = matrix(x)(y + surfaceSize.height - 1) val bottomRight = matrix(x + surfaceSize.width - 1)(y + surfaceSize.height - 1) // investigate further if corners are equal if (topLeft == bottomLeft && topLeft == topRight && topLeft == bottomRight) { breakable { for (sx <- x until x + surfaceSize.width; sy <- y until y + surfaceSize.height) { if (matrix(sx)(sy) != topLeft) { x = if (x == sx) sx + 1 else sx break } } // found one! resultPositions ::= Position2D(x, y) x += 1 } } else if (topRight != bottomRight) { // can skip x a bit as there won't be a valid match in current row in this area x += surfaceSize.width } else { x += 1 } } } return resultPositions } I already tried to include some optimizations in it but I am sure that there are far better solutions. Is there a matlab function existing for it which I could port? I'm also wondering whether this problem has its own name as I didn't exactly know what to google for. Thanks for thinking about it! I'm excited to see your proposals or solutions :)

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• Is there a way to access a php class method using javascript through jquery?

  - by Starx

  I have a js script, which is $("#feedbacksubmit").click(function() { if($("#frmfeedback").valid()) { var tname = $("#name").val(); var temail = $("#email").val(); var tphone = $("#phone").val(); var tcontent = $("#content").val(); var tsend = $(this).attr('ts'); $.post ( "bll/index.php", { action: 'mailfeedback', name: tname, email: temail, phone: tphone, content: tcontent, send: tsend }, function(data) { $('.msgbox').html(data); $("#frmfeedback")[0].reset(); }); return false; } }); however, I am trying to see if there is a way to access the class method of bll/index.php directly from the script, instead of posting parameters, to access it

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• How to iteratively generate k elements subsets from a set of size n in java?

  - by Bea Metitiri

  Hi, I'm working on a puzzle that involves analyzing all size k subsets and figuring out which one is optimal. I wrote a solution that works when the number of subsets is small, but it runs out of memory for larger problems. Now I'm trying to translate an iterative function written in python to java so that I can analyze each subset as it's created and get only the value that represents how optimized it is and not the entire set so that I won't run out of memory. Here is what I have so far and it doesn't seem to finish even for very small problems: public static LinkedList<LinkedList<Integer>> getSets(int k, LinkedList<Integer> set) { int N = set.size(); int maxsets = nCr(N, k); LinkedList<LinkedList<Integer>> toRet = new LinkedList<LinkedList<Integer>>(); int remains, thresh; LinkedList<Integer> newset; for (int i=0; i<maxsets; i++) { remains = k; newset = new LinkedList<Integer>(); for (int val=1; val<=N; val++) { if (remains==0) break; thresh = nCr(N-val, remains-1); if (i < thresh) { newset.add(set.get(val-1)); remains --; } else { i -= thresh; } } toRet.add(newset); } return toRet; } Can anybody help me debug this function or suggest another algorithm for iteratively generating size k subsets? EDIT: I finally got this function working, I had to create a new variable that was the same as i to do the i and thresh comparison because python handles for loop indexes differently.

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• Top n items in a List ( including duplicates )

  - by Krishnan

  Trying to find an efficient way to obtain the top N items in a very large list, possibly containing duplicates. I first tried sorting & slicing, which works. But this seems unnnecessary. You shouldn't need to sort a very large list if you just want the top 20 members. So I wrote a recursive routine which builds the top-n list. This also works, but is very much slower than the non-recursive one! Question: Which is my second routine (elite2) so much slower than elite, and how do I make it faster ? My code is attached below. Thanks. import scala.collection.SeqView import scala.math.min object X { def elite(s: SeqView[Int, List[Int]], k:Int):List[Int] = { s.sorted.reverse.force.slice(0,min(k,s.size)) } def elite2(s: SeqView[Int, List[Int]], k:Int, s2:List[Int]=Nil):List[Int] = { if( k == 0 || s.size == 0) s2.reverse else { val m = s.max val parts = s.force.partition(_==m) val whole = if( parts._1.size > 1) parts._1.tail:::parts._2 else parts._2 elite2( whole.view, k-1, m::s2 ) } } def main(args:Array[String]) = { val N = 1000000/3 val x = List(N to 1 by -1).flatten.map(x=>List(x,x,x)).flatten.view println(elite2(x,20)) println(elite(x,20)) } }

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• How to replace part of an input value in jquery?

  - by WonderBugger

  I've been trying to figure out a way to replace part of a string in an input value, but haven't been able to get it working. the input field looks like this: <input type="text" value="20,54,26,99" name="ids" /> I've tried: $('input[name=ids]').val().replace("54,",""); and var replit = $('input[name=ids]').val(); replit.replace("54,",""); $('input[name=ids]').val(replit); but neither worked?

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• How to get tag parameter value with XQuery

  - by uni

  For example i have this xml. I need to get value of parameter val of tag foo with id="two" <top> <sub id="one"> <foo id="two" val="bar" /> sometext </sub> </top> Whis this query (using Qt QXmlQuery): doc('test.xml')/top/sub[@id='one']/foo[@id='two']/<p>{@val}</p> I receive <p val="bar"/>, but I need only text "bar" without any tags. I tried to remove <p> and </p> and receive syntax error, unexpected { How can i get parameter value without any tags?

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• PHP - Calling function inside another class -> function

  - by Kolind

  I'm trying to do this: class database { function editProvider($post) { $sql = "UPDATE tbl SET "; foreach($post as $key => $val): if($key != "providerId") { $val = formValidate($val); $sqlE[] = "`$key`='$val'"; } endforeach; $sqlE = implode(",", $sqlE); $where = ' WHERE `id` = \''.$post['id'].'\''; $sql = $sql . $sqlE . $where; $query = mysql_query($sql); if($query){ return true; } } // }//end class And then use this function * INSIDE of another class *: function formValidate($string){ $string = trim($string); $string = mysql_real_escape_string($string); return $string; } // .. on $val. Why doesn't this work? if I write in a field of the form, it's not escaping anything at all. How can that be? * UPDATE * handler.php: if(isset($_GET['do'])){ if($_GET['do'] == "addLogin") { $addLogin = $db->addLogin($_POST); } if($_GET['do'] == "addProvider") { $addProvider = $db->addProvider($_POST); } if($_GET['do'] == "editProfile") { $editProfile = $db->editProfile($_POST); } if($_GET['do'] == "editProvider") { $editProvider = $db->editProvider($_POST); } } //end if isset get do ** The editProvider function works fine except for this :-) **

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• Issue with ko.observableArray

  - by user1574860

  I am using Knockout plugin. The following is my code. In this i am making getting the ceremony list from the server and then save that list in the array. But the problem is in IniitialCallForCeremonies(). The array is not initializing with the returned array from IniitialCallForCeremonies() function. function CeremonyViewModel() { var self = this; self.Ceremonies = ko.observableArray(InitialCallForCeremonies()); } $(document).ready(function () { ko.applyBindings(new CeremonyViewModel()); }); function InitialCallForCeremonies() { var request = $.ajax({ url: "address", type: "GET", async: false, dataType: "JSON" }).success(function (data) { var tempArray = new Array(); $.each(data, function (index, value) { tempArray.push(new Ceremony(value)); }); return tempArray; }); } function Ceremony(val) { this.Id = val.Id; this.Event = val.Event; this.Date = val.Date; this.Guest = val.Guest; }

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• Best way to score and sum in Scala?

  - by adam77

  Is there a better way of doing this: val totalScore = set.foldLeft(0)( _ + score(_) ) or this: val totalScore = set.map(score(_)).sum I think it's quite a common operation so was expecting something sleeker like: val totalScore = set.sum( score(_) )

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• Why does Safari not like the .trim() in JQUERY?

  - by nobosh

  This works fine in FireFox: $("#listname").val().trim() But in safari it errors: $("#listname").val().trim() while this does work, $("#listname").val() Why is that?

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• How to join by column name

  - by Daniel Vaca

  I have a table T1 such that gsdv |nsdv |esdv ------------------- 228.90 |216.41|0.00 and a table T2 such that ds |nm -------------------------- 'Non-Revenue Sales'|'ESDV' 'Gross Sales' |'GSDV' 'Net Sales' |'NSDV' How do I get the following table? ds |nm |val --------------------------------- 'Non-Revenue Sales'|'ESDV'|0.00 'Gross Sales' |'GSDV'|228.90 'Net Sales' |'NSDV'|216.41 I know that I can this by doing the following SELECT ds,nm,esdv val FROM T1,T2 WHERE nm = 'esdv' UNION SELECT ds,nm,gsdv val FROM T1,T2 WHERE nm = 'gsdv' UNION SELECT ds,nm,nsdv val FROM T1,T2 WHERE nm = 'nsdv' but I am looking for a more generic/nicer solution. I am using Sybase, but if you can think of a way to do this with other DBMS, please let me know. Thanks.

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• Why can't i define recursive variable in code block?

  - by senia

  Why can't i define a variable recursively in a code block? scala> { | val fibs: Stream[Int] = 1 #:: fibs.scanLeft(1){_ + _} | } <console>:9: error: forward reference extends over definition of value fibs val fibs: Stream[Int] = 1 #:: fibs.scanLeft(1){_ + _} ^ scala> val fibs: Stream[Int] = 1 #:: fibs.scanLeft(1){_ + _} fibs: Stream[Int] = Stream(1, ?) lazy keyword solves this problem, but i can't understand why it works without a code block but throws a compilation error in a code block.

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