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  • echo value inside a variable ?

    - by Kimi
    x=102 y=x means when i echo $y it gives x echo $y x --and not 102 and when i echo $x it give 102 lets say I dnt know what is inside y and i want the value of x to be echoed with using y someting like this a=`echo $(echo $y)` echo $a Ans 102

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  • How to check for undefined or null variable in javascript

    - by Thomas Wanner
    We are frequently using the following code pattern in our javascript code if(typeof(some_variable) != 'undefined' && some_variable != null) { // do something with some_variable } and I'm wondering whether there is a less verbose way of checking that has the same effect. According to some forums and literature saying simply if(some_variable) { // do something with some_variable } should have the same effect. Unfortunately, Firebug evaluates such a statement as error on runtime when some_variable is undefined, whereas the first one is just fine for him. Is this only an (unwanted) behavior of Firebug or is there really some difference between those two ways ?

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  • php foreach as variable

    - by user167850
    I'd like to use foreach to loop though an array list and add an element to each array. $tom = array('aa','bb','cc'); $sally = array('xx','yy','zz'); $myArrays = array('tom','sally'); foreach($myArrays as $arrayName) { ${$arrayName}[] = 'newElement'; } Is the use of ${$arrayName}[] the best way to do this? Is there another option rather than using curly braces? It currently works but I'm just wondering if there is a better alternative. Thanks

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  • Variable timeouts in GLib

    - by Matachana
    I need to modify a GLib's time-out interval while it is in execution. Is that possible? I took a look to the source code and it seems possible to me, but is required use some non-public functions from GLib internals. Should I reimplement GTimeoutSource or there are a way to do it?

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  • I can't set main Class variable in onCreate Method

    - by natrollus
    Main class has two variables that want to reach another class: public class MyClassA extends Activity { int i = 1; Button b1; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); this.i = 31; this.b1 = (Button) findViewById(R.id.btn1); ~~ } } Second class want to call variables in mainClass object: public class MyclassB implements OnClickListener{ MyClassA mainClass = new MyClassA(); Button btn = mainClass.b1; int n = mainClass.i; public void OnClick(View arg0){ Log.v("btn:",btn); Log.v("int:",n); } //btn returns null; //int returns 1; But onCreate method not set variables.. Why not set main class variables like this.i=31 ?

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  • Processing variable number of form fields

    - by a_m0d
    I am working on a form which displays information about orders. Each order has a unique id, but they are not necessarily sequential on the form. Also, the number of fields can vary (one field per row on the form). The input into the form will not be mapped straight into the database, but will be added to the current value in the database, and then saved. An example of the form is in the picture below - the callout on the right shows the id for each row. I know how to generate the form like this, but I can't work out how I can easily process each of these rows reliably. I also know how to give each of the fields a unique identifier, like name="row-23", but how can I translate that name so that I can update the related record in the database?

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  • Objective-C Passing a variable to another IBAction

    - by StuR
    This works fine: NSString *myVariable; - (IBAction) doFirstAction { myVariable = @"123456789"; } - (IBAction) doSecondAction { NSLog(@"%@",myVariable); } However, if I do this (substituting the @"123456789" for some code which returns the same value ie "123456789") I cannot access the value in doSecondAction. NSString *myVariable; - (IBAction) doFirstAction { myVariable = [imageNode getAttributeName:@"value"]; } - (IBAction) doSecondAction { NSLog(@"%@",myVariable); } Any clue as to why I cant access myVariable outside of doFirstAction?

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  • storing an integer constant other than zero in a pointer variable

    - by benjamin button
    int main() { int *d=0; printf("%d\n",*d); return 0; } this works fine. >cc legal.c > ./a.out 0 if i change the statement int *d=0; to int *d=1; i see the error. cc: "legal.c", line 6: error 1522: Cannot initialize a pointer with an integer constant other than zero. so its obvious that it will allow only zero.i want to know what happens inside the memory when we do this int *d=0 which is making it valid syntax. I am just asking this out of curiosity!

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  • insert VBS variable within a single-quoted WMI query

    - by jiaoziren
    Hi all, I am really frustrated by the snippet below: Dim objFSO, varSrc, varDest, varExt Set objFSO = CreateObject("Scripting.FileSystemObject") varSrc = WScript.Arguments(0) varDest = WScript.Arguments(1) varExt = WScript.Arguments(2) If objFSO.FolderExists(varSrc) Then WScript.Echo varSrc strComputer = "." Set objWMIService = GetObject("winmgmts:" _ & "{impersonationLevel=impersonate}!\\" & strComputer & "\root\cimv2") Set colMonitoredEvents = objWMIService.ExecNotificationQuery _ ("SELECT * FROM __InstanceCreationEvent WITHIN 10 WHERE " _ & "Targetinstance ISA 'CIM_DirectoryContainsFile' AND " _ & "TargetInstance.GroupComponent= " _ & "'Win32_Directory.Name=""c:\\\\kk ""'") Do Set objLatestEvent = colMonitoredEvents.NextEvent WScript.Echo objLatestEvent.TargetInstance.PartComponent Loop Else WScript.Echo "Bazinga" End If I tried to replace c:\\kk with varSrc however it seems impossible for WSH to recognize it in WMI query - not to mention it was within a single quote! I have tried chr(34) and it didn't work. Please help if possible. Much appreciated!

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  • How can I know whether my C++ string variable is a number or not

    - by user342580
    I have a string of class string string str; how can I check if it is a number or not, str can only have 3 possible types described below like abcd or a number like 123.4 or a number with a parenthesis attach to the end it for example 456) note the parenthesis at the end of "str" is the only possible combination of number and none number where the bottom two are considered valid numbers, I know I could use lexical_cast if only the first 2 cases occur, but how about considering all 3 possible cases to occur? I don't need to do anything fancy with str, I just need to know whether it is a valid number as I described

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  • Display a variable when a select box option is selected

    - by user782104
    For example, the select box <select><option selected="" value="">Please Select</option><option value='txt'>Text</option><option value='int'>Numbers</option><option value='bool' >Boolean</option></select> has a string $messageList=array ( 'txt'=>'text message', 'int'=>'int message','bool'=>'bool message'); What i would like to achieve is to display correspond message when the optition is select?

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  • Constructor with non-instance variable assistant?

    - by Robert Fischer
    I have a number of classes that look like this: class Foo(val:BasicData) extends Bar(val) { val helper = new Helper(val) val derived1 = helper.getDerived1Value() val derived2 = helper.getDerived2Value() } ...except that I don't want to hold onto an instance of "helper" beyond the end of the constructor. In Java, I'd do something like this: public class Foo { final Derived derived1, derived2; public Foo(BasicData val) { Helper helper = new Helper(val); derived1 = helper.getDerived1Value(); derived2 = helper.getDerived2Value(); } } So how do I do something like that in Scala? I'm aware of creating a helper object of the same name of the class with an apply method: I was hoping for something slightly more succinct.

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  • Python required variable style

    - by Adam Nelson
    What is the best style for a Python method that requires the keyword argument 'required_arg': def test_method(required_arg, *args, **kwargs: def test_method(*args, **kwargs): required_arg = kwargs.pop('required_arg') if kwargs: raise ValueError('Unexpected keyword arguments: %s' % kwargs) Or something else? I want to use this for all my methods in the future so I'm kind of looking for the best practices way to deal with required keyword arguments in Python methods.

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  • Global jQuery dialog variable not working properly

    - by Ben Dauphinee
    When I call the function, the dialog does work. If I move the dialog construction into the showtimes_list function, everything works fine. I thought that variables declared outside a function were global in context? var dialog_list = $("<div></div>").dialog({ autoOpen: false, modal: true, height: 300, width: 720, }); function showtimes_list(sid){ dialog_list.html(""); $.get("ajax_showtimes.php?sid="+sid, function(data){ dialog_list.html(data); } ); dialog_list.dialog("open"); }

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  • Consolidating data in SharePoint from different sites based on variable site naming

    - by Mughrabi
    Hi, am working on a project where I want to pull data from different lists in SharePoint and have these data imported into a single list. The list has the same attribute everywhere; it is located in different sites. I have a list which contains all the site names and URL to those sites. The idea is to read from this list all the site names and then go to each one of those sites and try and pull the information from the list under that particular site, in synchronies matter. Data that are pulled from last week’s process do not need to be pulled again. Can someone guide me in explaining what would be the best way to doing this solution? Am using SharePoint 2007

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  • Joomla Session Variable as Plugin Parameter

    - by dosboy
    I have a Joomla plugin which takes varying parameters. I need to retrieve one of these parameters from the current session. I've tried using Jumi and a little PHP snipped to retrieve the value and output it in the plugin's parameter list, but the Joomla plugin parser only handles the outter-most set of curly braces. ex. {fabrik view=table id=62 resetfilters=1 fab_tours_ro___tour_id=[tour_id]} [tour_id] I need to retrieve from the current session. I've tried {fabrik view=table id=62 resetfilters=1 fab_tours_ro___tour_id={jumi [scripts/get_tour_id.php]}} In that case the {jumi} tag never gets parsed. I could hack the {fabrik} plugin, but I'd prefer to do this without making any core or component changes, especially since I update Fabrik quite regularly via svn.

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  • undefined reference to static member variable

    - by Max
    Hi. I have this class that has a static member. it is also a base class for several other classes in my program. Here's its header file: #ifndef YARL_OBJECT_HPP #define YARL_OBJECT_HPP namespace yarlObject { class YarlObject { // Member Variables private: static int nextID; // keeps track of the next ID number to be used int ID; // the identifier for a specific object // Member Functions public: YarlObject(): ID(++nextID) {} virtual ~YarlObject() {} int getID() const {return ID;} }; } #endif and here's its implementation file. #include "YarlObject.hpp" namespace yarlObject { int YarlObject::nextID = 0; } I'm using g++, and it returns three undefined reference to 'yarlObject::YarlObject::nextID linker errors. If I change the ++nextID phrase in the constructor to just nextID, then I only get one error, and if I change it to 1, then it links correctly. I imagine it's something simple, but what's going on?

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  • get content of a div from a variable using jQuery

    - by devdarsh
    i am building a php form with ajax and i am submitting the form variables to the same page where the form resides. my validating code looks like if($valid){ echo "<div id='retmsg'>Your message has been submitted successfully</div>"; } else { echo "<div id='retmsg'>An error occured!</div>"; } My ajax code function form_submit() { $('#response').html('Loading...').fadeIn(); $.ajax({ type: "POST", url: "<?php $_SERVER['PHP_SELF']; ?>", data: "title=" + $('#title').val() + "&content=" + $('#contents').val(), success: function(html){ var message = $("#retmsg").html(html); alert(message); } }); } i need to alert the contents of div id "retmsg". But the alert shows me like "[Object Object]". Please help me...

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  • Js Variable Reference Quickie

    - by Nikki
    Hoping someone can clear this up for me. Let's say I have 2 globals: var myarray=[1,3,5,7,9],hold; and then I do this: function setup() { alert (myarray[0]);//shows 1 hold=myarray; alert (hold);//appears to show 'hold' containing all the values of myarray. first number shown is 1 myarray[0]=2; alert (hold);//shows the values of myarray with the updated first entry. first numbe shown is 2 } Am I to take it that 'hold' is simply keeping a reference to myarray, rather than actually taking all the values of?

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  • pass by reference but reference to data and not to variable

    - by dorelal
    This is psesudo code. In what programming language this is possible ? def lab(input) input = ['90'] end x = ['80'] lab(x) puts x #=> value of x has changed from ['80'] to ['90] I have written this in ruby but in ruby I get the final x value of 80 because ruby is pass-by-reference. However what is passed is the reference to the data held by x and not pointer to x itself same is true in JavaScript. So I am wondering if there is any programming language where the following is true.

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