passing gridview textbox value to javascript

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Hello all,
I have a gridview with textbox template field where I insert Marks of students, now I want to validate the textbox (checking full marks of particular paper),here I need to pass the value of textbox to javascript so that I can validate textbox on onkeypress event of textbox how i can do so..

Or Is there any best alternative..

Posted 30-May-12 16:37pm

Gopal Rakhal

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Linto Leo Tom · Answer 1 · 2012-05-30T18:50:00

Solution 1

Hi Gopal,

Try the below code

var grid = document.getElementById("<%= GridName.ClientID %>");
for (var i=0; i<grid.rows.length; i++){
var row = grid.Rows.getRow(i);
var ActivityTypeCell = row.getCell(10);
var ActivityTypeDropdown = ActivityTypeCell.getElement().childNodes[0];
var value= row.getCell(cellindex).getElement().childNodes[0].value
}

Replace the cellindex with the inxdex of the cell where the text box lies.

Happy Coding
:)

Posted 30-May-12 18:50pm

Linto Leo Tom

Updated 30-May-12 18:51pm

v2

Comments

Gopal Rakhal 31-May-12 9:40am

Thanks

Gopal Rakhal 31-May-12 10:34am

Thanks but I am not understanding you, I want to validate my textboxes inside Gridview. I want to restrict the user that he/she should not enter the marks greater than 80 or else. how can i do so...

Sandeep Mewara · Answer 2 · 2012-05-30T19:03:00

Solution 2

here I need to pass the value of textbox to javascript
gridview with textbox template field

Add a client side onkeyup to each textbox in a RowDataBound method where each row is called. Find the textbox using FindControl and then add onclick attribute referring a JS method.

In JS method, get the textbox value and then apply your logic.

Something like:

protected void GridView_RowDataBound(Object sender, GridViewRowEventArgs e)
{  
  TextBox tb = (TextBox)e.Row.FindControl("TextBox1");
  tb.Attributes.Add("onkeyup", "javascript: ValidateMe(this);"); 
}

JavaScript

function ValidateMe(currtextbox)
{
   // Use currenttextbox.value to validate
}

Posted 30-May-12 19:03pm

Sandeep Mewara

Comments

Gopal Rakhal 31-May-12 9:40am

thanks

Gopal Rakhal 31-May-12 10:30am

Thanks Sandeep, I tried ur code, but its giving "Object reference not set to an instance of an object." error, Actually i am loading my gridview on pageload, and want to check/validate on onekeypress event..

Sandeep Mewara 31-May-12 14:51pm

1. I told you somewhat like that - not an exact code (yet i dont see a potential place of null reference if you have a textbox1 defined)
2. Whatever you are doing, rowdata bound will be raised when you bind your grid. Use Visual Studio DEBUGGER and then follow the execution to see how things are working. Use F11.