ASP.Net dropdownlist post back on lose focus?

Question

Right now I'm using the OnSelectedIndexChanged event to trigger a post back and update some other fields in the form. That works fine. But I would like it to do the post back when the drop down list loses focus, rather than on every change. The problem is, when someone selects the list, then types a number, it will change with every key stroke they press, and that will trigger the post back before they get to the value they are trying to type.

Is this possible?

score 3 · Answer 1 · answered Aug 04 '11 at 16:30

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The JavaScript event for something losing focus is called onblur.

Use Attributes.Add() in server-side code to add the function name to be called. You can then trigger the postback from said function.

answered Aug 04 '11 at 16:30

Widor

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I don't want to run javascript, I want to run server side code onblur. Can I use javascript to trigger the post back? – Petey B Aug 04 '11 at 16:34
Yes, in fact ASP.NET uses JavaScript to trigger postbacks already, you just don't write it explicitly so it isn't immediately obvious. You can either call it yourself (a bit quick & dirty), or trigger a hidden control to do the postback 'naturally'. Take a look at [this question.](http://stackoverflow.com/questions/5448825/is-it-ok-to-use-dopostback). – Widor Aug 04 '11 at 16:40

score 3 · Accepted Answer · answered Aug 04 '11 at 16:36

3

Try this.

ddlDropDown.Attributes.Add("onblur", "__doPostBack('ddlDropDown','');");

I have not tested it, but I believe it will work - or I hope.

answered Aug 04 '11 at 16:36

janhartmann

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ASP.Net dropdownlist post back on lose focus?

2 Answers2