(Patrick C. Cole (MS))
1/8/2003 3:02:00 PM
hs,
All server controls are just classes that have common and unique methods.
They all have a common method called Render. In this method, they use a
HtmlTextWriter object to emit\output\write to the outgoing HTML stream that
is sent to the client. Exactly what is in the output varies, but it is
standard html. A render method for a textbox might look something like
this:
Public void Render(HtmlTextWriter output)
{
output.write(“<input type=text id=” + this.id + “ value=’” +
this.value + “’ >”);
}
In this method, you can write out whatever you want. You could write a
line like
output.write (“<javascript>window.form1.textbox2.focus();</javascript>”);
or more elaborate statements. And these will get rendered with your
control in the browser. This particular statement will execute when the
javascript is rendered by the browser, so it’s important to have the
control in place before the javascript executes, or the object won’t exist
yet.
So you can build a control that just writes out javascript, and has a
property that takes a string. The property is for the control id that you
want to set focus to. You could then change focus on postbacks by setting
another id in this property.
Patrick Cole
Microsoft Developer Communities
This posting is provided "AS IS" with no warranties, and confers no rights.
You assume all risk for your use. © 2002 Microsoft Corporation. All rights
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| Subject: RE: TextBox.TextChanged event and key strokes
| Date: Mon, 6 Jan 2003 07:12:36 -0800
| Lines: 25
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| Thank you Earl (and Patrick) for your help.
| Just a couple of things.
|
| Please can you explain what you meant by the following.
| I'm still new to this development environment.
|
| >An approach that works fairly well is to create a control
| that simply emits
| >a javascript statement to set focus to a control
| specified in the focus
| >control's properties. This control would have to be the
| last control on
| >the page to work correctly.
| >
|
|
| >I also don't believe it is possible to set focus to a
| hidden text box. If
| >it could accept focus, it would have to be visible.
| >
| I'm going to check if this is the case. But I can live
| with the fact if the TextBox is visible and has focus
| (which you have demonstrated).
| Thanks
| hs
|