codepaq

Wednesday, March 29, 2017

Set [Enter] key as default action to cause associated button to click

In the example below, each textbox has its own default button. While focus is in a text box, pressing [Enter] key will cause the associated button to click so that you do not need to click the associated button separately.


<!doctype html>
<html>
<head><title>Set Enter Key as default Click</title>
<style type="text/css">
 body { font-family: Verdana, Tahoma; line-height: 1.7em; font-size: 0.85em; }
</style>
<script
  src="https://code.jquery.com/jquery-1.12.4.min.js"
  integrity="sha256-ZosEbRLbNQzLpnKIkEdrPv7lOy9C27hHQ+Xp8a4MxAQ="
  crossorigin="anonymous"></script>
</head>
<body>
 <h1>Enter Key Capture</h1>
 <div>
  <input type="text" id="txt1" />
  <input type="button" id="btn1" class="defaultButton" value="Button1" />
 </div>
 <div>
  <input type="text" id="txt2" />
  <input type="button" id="btn2" class="defaultButton" value="Button2" />
 </div>
</body>
<script type="text/javascript">
 $( document ).ready( function() {
  
  $( 'input[type=text]' ).bind({
   keypress: function( event ){
    if( checkIfEnterKeyPressed() ){
     
     var message = "Enter key has been pressed while in " + 
         $(this).attr("id") + ".";
     
     $(this).siblings(".defaultButton").bind(
      "click", 
      { msg: message }, 
      function( event ){
       alert( event.data.msg + "\n" + $(this).val() + " clicked." );
      }
     ).click();
    }
   }
  });
 
  var checkIfEnterKeyPressed = function(){
   var keycode = ( event.keyCode ? event.keyCode : event.which );
   return ( keycode == '13' ? true : false );
  };
 });

</script>
</html>

Good old popup dialog

Good old popup dialog example: parent page collects data from child popup dialog.

parent.html

<!doctype html>
<html><head><title>parent</title>
</head>
<body>
Name: <input type="text" id="txtName" readonly="readonly" />
<input type="button" value="Open Popup" onclick="openPopup()" />
</body>
<script type="text/javascript">
 var openPopup = function(){
  popup = window.open( "popup.html", "Select Name", "width=300,height=100;" );
  popup.focus();
 };
</script>
<html>

popup.html

<select name="ddlNames" id="ddlNames">
 <option value="Ken">Ken</option>
 <option value="Steve">Steve</option>
 <option value="Sam">Sam</option>
 <option value="Kirk">Kirk</option>
</select
<br /><br />
<input type="button" value="Make Selection" onclick="makeSelection()" />
<script type="text/javascript">
 var makeSelection = function(){
  if( window.opener != null && !window.opener.closed ){
   var nameSelected = document.getElementById( "ddlNames" ).value;
   var txtName = window.opener.document.getElementById( "txtName" );
   txtName.value = nameSelected;   
  } 
  window.close();
 };
</script>

Linq Example of Group-By

Group-By Example in Linq.

var groupByResult = 
    from p in db.Person
    join s in db.School
    on p.SchoolID = s.SchoolID
    group new { p, s } by new { p.SchoolID, s.SchoolName }
    into grp
    select new
    {
        Count     = grp.Count(),
        SchoolID  = grp.Key.SchoolID,
        SpaceName = grp.Key.SchoolName
    }

Monday, January 16, 2017

Dismiss Keyboard When Tapping Outside UITextField

A quick way to dismiss keyboard when tapping outside a UITextField can be done as follows.

- (void)viewDidLoad {
    ...
    [self.view addGestureRecognizer:[[UITapGestureRecognizer alloc] 
                                       initWithTarget:self.view 
                                               action:@selector(endEditing:)]];
    ...
}

The same can be re-written with a selector method as follows.

- (void)viewDidLoad {
    ...
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] 
                                     initWithTarget:self
                                             action:@selector(hideKeyboard)];
    [self.view addGestureRegnizer:tap];
    ...
}

- (void)hideKeyboard {
    [self.view endEditing:YES];
}

Friday, January 13, 2017

Async Request using dataTaskWithRequest

Here is a simple example of Async Request using [NSURLSession dataTaskWithURL].

- (void) asyncDemo1 { NSURL *url = [NSURL URLWithString:@"https://mysite.com/sampleData.json"]; NSURLRequest *request = [NSURLRequest requestWithURL:url]; NSURLSession *session = [NSURLSession sharedSession]; NSURLSessionTask *task = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable taskError) { dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^(void){ // ----- Place background thread operations here ----- // dispatch_async(dispatch_get_main_queue(), ^(void){ // ----- Place async UI update, etc here ----- // if(taskError){ NSLog(@"taskError is %@", [taskError localizedDescription]); } else{ NSLog(@"%@", [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]); } }); }); }]; [task resume]; }

App Transport Security Exception using Info.plist

Here's a short snippet to allow domain exceptions in Info.plist. Method 1 is not recommended, because it will allow all domains. Method 2 is recommended.

Method 1: Not recommended (all domains are accessible) <plist> <dict> . . . <key>NSAppTransportSecurity</key> <dict>  <key>NSAllowsArbitraryLoads</key> <true /> </dict> . . . </dict> </plist>
Medhod 2: Recommended (only mysite.com is allowed) <plist> <dict> . . . <key>NSAppTransportSecurity</key> <dict> <key>NSExceptionDomains</key> <dict> <key>mysite.com</key> <dict> <key>NSExceptionAllowsInsecureHTTPLoads</key> <true /> <key>NSIncludesSubdomains</key> <true /> </dict> </dict> </dict> . . . </dict> </plist>

Friday, January 6, 2017

WCF Configuration for Response in JSON Format

Below is a simple example of WCF that returns data in JSON format.

When using UriTemplate in WebInvoke attribute, all parameters should be of string type.
In the web.config, don't forget to add serviceBehavior and endpointBehavior.
The endpointBehavior needs to have <webHttp /> and not <enableWebScript />.
When using WCF for Ajax client (i.e., $.ajax()), keep in mind that Ajax client only knows "GET" and "POST" and not "PUT" or "DELETE".

IService2.cs

[OperationContract]
[WebInvoke(Method ="GET", 
   UriTemplate = "/CategoryName/{id}", 
   ResponseFormat = WebMessageFormat.Json, 
   RequestFormat =WebMessageFormat.Json)]
string GetCategoryName(string id);

Service2.svc.cs

public class Service2 : IService2
  public string GetCategoryName(string id)
  {
     string retVal = "NotFound";
     int categoryID = Convert.ToInt32(id);
     using (NorthwindEntities db = new NorthwindEntities())
     {                
        var category = db.Categories.Find(categoryID);
        if(category != null)
        {
           retVal = category.CategoryName;
        }
     }
     return string.Format("Category with ID {0} is {1}.", categoryID, retVal);
   }
}

web.config


<system .servicemodel="">
    <behaviors>
      <servicebehaviors>
        <behavior name="default">
          <servicemetadata httpgetenabled="true" httpsgetenabled="true">          
          <servicedebug includeexceptiondetailinfaults="false">
        </servicedebug></servicemetadata></behavior>
      </servicebehaviors>
      <endpointbehaviors>
        <behavior name="default">
          <webHttp/>
        </behavior>
      </endpointbehaviors>
    </behaviors>
    <services>
      <service behaviorconfiguration="default" name="NorthwindWCF.Service2">
        <host>
          <baseaddresses>
            <add baseaddress="http://localhost:4957">
          </add></baseaddresses>
        </host>
        <endpoint behaviorconfiguration="default" binding="webHttpBinding" contract="NorthwindWCF.IService2">
        </endpoint>
      </service>
    </services>
    <protocolmapping>
      <add binding="basicHttpsBinding" scheme="https">
    </add></protocolmapping>
    <servicehostingenvironment aspnetcompatibilityenabled="true" multiplesitebindingsenabled="true">
  </servicehostingenvironment></system>