Silverlight RichTextBox Scrolling Problem

Problem:

             When assigning value to the RichTextBox and there is larger text and vertical scrolling of the control display then it will scroll to bottom instead of scroll bar to top which need to fix. Which you can see in the Image 1.

Image 1

Solution:

             The solution to the above mentioned problem is very easy as when used the RichTextBox control for my one of application I also see this problem and have to fix the problem as it is not good that control go to the bottom of the text instead of showing the start of the text. I have use same example code from my last post "Silverlight RichTextBox Control For Beginners " Just modified the layout of the page so that both the RichTextBox binding string and Xaml property of the RichTextBox have vertical scroll bars.The modified code of the property changed event of the view model is listed in List 1 here  you can see that I have used the ContentStart property of the RichTextBox control to get the start of the content of the RichTextBox control.

List 1

The ContentStart are stored in the TextPointer and then in the next statement I have used the Selection.Select by providing the start pointer to the selection and it will move at the start of the content of the RichTextBox.You can see the output in the Image 2 where you can see that first RichTextBox is scrolled at bottom but the second on is scrolled at top which we want to achieved.

Image 2

As I have mentioned in my post that I have used the sample of my last post "Silverlight RichTextBox Control For Beginners " , So you can get source code from above link and test the code which I have listed in List 1  and you have to made some GUI modification as well so that both the RichTextBox control have the vertical scroll bars.

All and any comments / bugs / suggestions are welcomed!

Silverlight RichTextBox Control For Beginners

Problem:

               Need to use the RichTextBox control of the Silverlight 4 and need ways to bind the RichTextBox control to the view model properties.

Solution:

               This post is for the absolute beginner who want to use the RichTextBox control of the Silverlight in their application. So in this post I will show how you can use MVVM pattern to bind the RichTextBox to the properties of the view models and what properties of the RichTextBox are used for binding.You can see in the Image 1 that I have used two way to display text in RichTextBox control. On the left side is the simple string and on the right side is formatted string.

Image 1

First I will discuss how can you bind the simple string to the RichTextBox control. For this you have to add the Paragraph tag inside the RichTextBox control as I have done in the code in the List 1. A Paragraph element is used to group content into a paragraph.The Paragraph tag contains one or more child elements such as Run, Hyperlink,  Bold, Span etc (You can see full list of child element tag here which you can add in the Paragraph tag.). Here you can see that I have added the run as the child element to display the string. Here I have bind the Run child element text property with RichTextBoxText which I have defined in my ViewModel as string.

List 1

By using the above technique you can bind the simple string property to the RichTextBox to show the simple string but If you want to use RichTextBox just for the simple string then better to use simple TextBlock control as RichTextBox is offering more then just displaying simple text.

To display formatted text like bold the some text,underline some of the text, set some color to the some text to highlight the text then it is better to use the RichTextBox control to display formatted text. Now we are ready to display some rich content in the RichTextBox control for this we have to use the Xaml property of the RichTextBox and the Xaml property is not dependency property it mean we can't use it for binding as we did in case of display simple string in the RichTextBox control. In HomeViewModel I have second property of type string which hold the Xaml which I will display in the RichTextBox control.The Xaml which I used to display I got it by using this application which give you detail of how to use the RichTextBox control to create the text editor for the silverlight application. I have pasted my string in that application and just formatted the text and then use the Xaml property to get the Xaml.

List 2

As I have mention that Xaml property is not dependency property so you can't use it for the binding. To assign value to the the Xaml property of the RichTextBox what I did is to registered the PropertyChanged event of the ViewModel in the code behind and then check the name of the property which is changed and then assigned the value to the Xaml property RichTextBox control.

Hope you got some idea of how to getting start with the RichTextBox control.You can download the source code of the sample from here.

All and any comments / bugs / suggestions are welcomed!

How to get Selected Rows of the grid Using JavaScript

Problem:

              Need to get the selected rows values using JavaScript in MS CRM 2011.

Solution:

              In my post "Retrieve rows in crm2011 subgrid with JScript" where I show you how to read all the rows of the subgrid in the Microsoft CRM 2011 using JavaScript. For this problem I will use same code but with some modification to get the rows which are selected by user. The code which is used to get the selected row detail is shown in List 1.

List 1

In the above code the only thing which is noticeable is the use of the get_selectedIds function of the grid control which will return the Ids of the selected rows, In this case the GUID of the record and then comparing the GUID with the original grid rows and if the Id is found mean row is selected and the each cell value is displayed of the selected row.


All and any comments / bugs / suggestions are welcomed!

Checking Existing Value for a Field using OData

Problem:

               We need to check the existing value of the MS CRM 2011 form. Mean we need to prevent the duplicate value of the Account form "Account Number" field and we need to check the value of the "Account Number" when user press save button, check the value in the database and then based on the return value we show message to use and prevent close of form.

Solution:

               We need to check the existing value of the MS CRM 2011 form. Mean we need to prevent the duplicate value of the Account form "Account Number" field and we need to check the value of the "Account Number" when user press save button, check the value in the database and then based on the return value we show message to use and prevent close of form.
JavaScript which is used for the above problem as mention in the Problem section is shown in List 1 here you can see that I have created simple function with name "checkAccountNumber" which is used to check the account number of the account, when you create online Organization which is of trial period of 30 days then you can see that Account number is the field which is already added mean you don't need to add any custom field. In the start of the function is the first statement is used to get the Id of the current record so that I can check if record is used for update then we need to exclude the current record from the search if I don't then it will always return record if we don't change the Account number when updating the account record. Next is the If condition to check the value of the current record if value is not null then add the and (as this will be second condition in the search as the Account number condition will be the first condition)  and then AccountId (primary id of the account) with ne (not equal ) operator. If the account id is null then "accoundIdCondition" will be empty string and we will search with the account condition only.

List 1

The next important thing in the code which I like to explain is the accountNumberRequest.open() the third parameter which is false is used to determine whether call is async o sync as we need to send  sync call because if we send async then when the completed event of the form called the form will be closed. So we will pass false in the third parameter sot that call be will sync and depending on the return value we will prevent the form from closing and saving record. In the getAccountNumberCallBack function I just check for the record and then show message to the end user and then call the preventDetault() function which is used to Cancels the save operation, but all remaining handlers for the event will still be executed.

Image 1

The output of the above function when you execute is shown in the Image 1.Here you can see that I have enter account number which already exist in the database.If it is not in the database then it will not close the form and the form will save the record.

All and any comments / bugs / suggestions are welcomed!