data manipulation within an EditItemTemplate field on Autopostback

[Dijital]

I'm writing a small app to track the assets within our organization. When editing an existing record (in a detailsview form) I have three fields: Purch_Month, Purch_Year and Repl_Year.
The first two (Purch x 2) are already populated when the record is created outside the app. When editing the record though, I want the form to do one of two things:

1) if the Repl_Year is NULL --> Set Repl_Year = Purch_Year + 3.
2) if Purch_Year is changed, it triggers an autopostback, which should trigger an eval on Repl_year to update that value as is example 1 (ie, Set Repl_Year = Purch_Year + 3).

I think I know how to do he page load triggers etc, but I really have no ide on how to address the edititemtemplatefield.

Any assistance (or even a mention of a better path to the same ends) would be appreciated.

Thanks!

Jim

 

[jmeckley]

you can calculate the initial replenishment value when the page first loads

if(replace value is empty)
{
   ReplenishmentTextBox.Text = (purchaseYear+3).ToString();
}

after that I would use javascript (jquery) to do the calculation. since webforms produces hideous client ids I would assign a unqiue css class to identify the control. here is an example

<asp:Textbox id... CssClass="purchase-year"/>
<asp:Textbox id... CssClass="replace-year"/>

and the jquery

$(function(){
   $('.purchase-year').blur(function(){
       $('.replace-year').val(this.value+3);
   });
});

requests to the server simply to add 2 numbers would not allow for a good user experience. You *could* use ajax to get back to the server, but again, that's overkill for basic math.

Jason Meckley
Programmer
Specialty Bakers, Inc.

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