Manipulate GridView Rows, Cells, Cell Controls from JavaScript

In one of the functionalities I was developing, I needed to integrate my GridView with JavaScript. I mean I was supposed to change the text in few cells of GridView. So, I dig it little bit and found out a way as I have shown below.

Accessing GridView rows/cells from JavaScript:

<script type=”text/javascript” language=”javascript”>

tblTable=document.getElementById(‘<<Client ID of the GridView>>’);
Cell=tblTable.rows[0].cells[0];
Cell.innerHTML=’Hurra!!!!! I have accessed the first row, first cell’;

</script>

Accessing GridView Rows/cells and Cell Control from JavaScript:
Isn’t it a great way to access GridView from JavaScript?

<script type=”text/javascript”>

tblTable=document.getElementById(‘<<Client ID of the GridView>>’);
Cell=tblTable.rows[0].cells[0];
FirstControl = Cell.childNodes[0];

</script>

Hope this will help you out.

Manipulate Validator controls and Validation Group from JavaScript

Today, I was working on Validator controls and there was a need to make few validator controls enabled or disabled from JavaScript. So, I was walking through it and I found below few things.

• To enable Validator from JavaScript

ValidatorEnable(<<Validator Client ID>>, true);

• To disable Validator from JavaScript

ValidatorEnable(<<Validator Client ID>>, false);

• To Validate all the Validator control from JavaScript

Page_ClientValidate();

This function will return true if there is no validation error otherwise it will return false.

• To Validate a Specific Validator Group from JavaScript

Page_ClientValidate(<<ValidationGroupName>>)

So, this way we can manipulate validator controls and validation group from JavaScript. I hope this will help you out.

IIF Construct, a Handy ShortHand of IF-ELSE

As I was reviewing the ASP.Net code of one of my friends, I found following thing.

Dim intValue As Integer = 10

Dim blnFlag As Boolean

If intValue = 10 Then

blnFlag = True

Else

blnFlag = False

End If

So, I suggested him a shorthand provided in ASP.NET i.e. IIF Construct.

Syntax:

IIF(<<Expression>> ,<<True Part>>,<<False Part>>)

Explanation:

Expression: The Expression which needs to be evaluated.

True Part: What action to be taken if Expression is True

False Part: What action to be taken if Expression is False

Example:

Dim intValue As Integer = 10

Dim blnFlag As Boolean = IIf(intValue = 10, True, False)

So, above shorthand is very much handy to use.

Strip All HTML Tags from a String by Regular Expression

In one of my functionality, I needed to strip all HTML tags from a String and then I need to show it to User. So, I have used Regular Expression for that. Following is the example of it.

Procedure:

1. Retrieve All HTML Tags using <(.|\n)*?> Pattern
2. Replace them with Empty String and return the Result.

Example 1:

Private Function StripHTML(ByVal htmlString As String) As String

‘”<(.|\n)*?>” -> This pattern Matches everything found inside html tags;

‘”(.|\n)” -> Look for any character or a new line

‘”*?” -> 0 or more occurrences, and make a non-greedy search meaning

‘That the match will stop at the first available ‘>’ it sees, and not at the last one

Dim Pattern As String = “<(.|\n)*?>”

Return Regex.Replace(htmlString, Pattern, String.Empty)

End Function

Example 2:

You can just use one line also as following

Regex.Replace(textBox1.Text,@”<(.|\n)*?>”,”");

Sharing Helping Hands

Hello Development Community,

I Kinjan Shah, Software Engineer, MCP, MCAD would like to give Helping Hands to freshers i.e. New Commers in this field and the vetrans as well.

In This blog I’ll share Tips, Tricks, Hacks about JavaScript, ASP.NET, SQL Server, AJAX and much more. This is just to help every one who is passing through and utilizing their time in finding solutions of the error which I have already Solved. So, basically I would like to save your time by Providing solutions.

You can also post your questions or the problems you face. I’ll be glad to help you out guys.

Thanks and Regards,
Kinjan Shah.