How do I connect with the pageâs JScript?

BrianWren · November 21st, 2006, 04:30 PM

Given the following:

Code:

<html>
<body>
    <asp:FileUpload ID="FilUpld" runat="server" OnLoad="alert('load');" />

</body>
</html>

I get the error message that â'alert' is not a member of 'ASP.<my_page>_aspx'.â How can I tell an asp control to utilize straight JavaScript commands and statements?

Tried changing to

Code:

<asp:FileUpload ID="FilUpld" runat="server" OnLoad="javascript:alert('load');" />

but got â'javascript' is not a member of 'ASP.<my_page>_aspx'â

BrianWren · November 28th, 2006, 04:11 PM

Thereâs got to be a way... Anyone?

woodyz · November 28th, 2006, 09:04 PM

Is there an OnLoad event on the input for type=file?

Woody Z http://www.learntoprogramnow.com

BrianWren · November 29th, 2006, 04:33 PM

There is. Of course, that doesn't mean a lot. I believe the list of choices in a standard HTML control is the same for every control, when the IDE is presenting the IntelliSense choicesâI don't think they are control-type specific as is the case with asp: controls.

I added

Code:

    FileUploader.Attributes.Add("onchange", "'TestLoad();'") ' and
    FileUploader.Attributes.Add("onload",   "'TestLoad();'")

but neither ran TestLoad()...

For an asp:button I find thatânestled in among the other choicesâthere is OnClientClick.

The OnClick event operates as part of the Submit machineryâit doesn't actually add anything to the HTML-rendered button. The OnClientClick becomes an OnClick entry in the properties of the rendered button.

(I knew there just had to be a wayâthe JavaScript of a page is just too useful to universally ignore.)

I am essentially writing an HTML wizard, which has 3 panes. In the 1st the user fills in controls to set what to do with the data. When that is configured properly (7 digits in one control, a single letter in the other), the [[u]Next] button is enabled. When they click it, a 2nd <div> is made visible instead, with a [[u]Cancel], a [[u]Back] and a [[u]Next] button (the last of which is disabled), and an FileUpload control. the user having selected a file, I want to enable the 2nd divâs [[u]Next] button.

Suggestions?

woodyz · November 29th, 2006, 08:21 PM

Well, the html Body, Image, Frame, Link, and a few other elements have an onLoad event (I'm talking client side events here), but I don't think an input element has an onLoad. However, there are events that an input element of type=file has that can be useful to you.

Anyway, it looks like you have found how to hook to client javascript, right? What your first post shows is how to hook up to server side events, not client side. The line:

<asp:FileUpload ID="FilUpld" runat="server" OnLoad="alert('load');" />

is trying to hook you up to a server side method called "alert", and it will call that code when the control is loaded in the flow of the page_load - and that, of course, isn't what you are after. I am sure you know that by now.

So, making the wizard is where you are at. If one of the input/type=file events are useful to you, you need to able to hook up to one of those, if I understand correctly, so that the Next button becomes enabled. So how to do that? The event I recommend you try is the onpropertychange event, which will fire each time you type a character into the field text field, or after selecting a file after clicking the browse button. Note that you could do certain validations as well as enable the Next button. You also have to remember that not all browsers will necessarily deal with these events equally.

Woody Z http://www.learntoprogramnow.com