Hi Davec,
After reviewing the description, I think the question is: You used
InnerHtml property of the head tag in the Page_Load event to add some
JavaScript code into <head> ...</head>, and used
cboMyCombo1.Attributes.Add("onchange", "MyCombos_OnChange('1')") to call
MyCombos_OnChange when the dropdownlist’s onchange event fires. However,
the MyCombos_OnChange was not called as expected and A "Microsoft JScript
runtime error: Object expected" error occurred. Please post here if I have
any misunderstandings.
I have done a test and here is the code snippet. It works well on my
machine; you can try it on your side.
private void Page_Load(object sender, System.EventArgs e)
{
HtmlGenericControl head=(HtmlGenericControl)this.FindControl ("myhead");
head.InnerHtml ="<script language=JavaScript> function
MyCombos_OnChange(i){alert(i);}</script>";
DropDownList1.Attributes.Add("onchange","MyCombos_ OnChange('1')");
}
<HEAD id ="myhead" runat =server >
...
...
</HEAD>
<form id="Form1" method="post" runat="server">
<asp:DropDownList id="DropDownList1" style="Z-INDEX: 101; LEFT: 128px;
POSITION: absolute; TOP: 80px" runat="server">
<asp:ListItem >1</asp:ListItem>
<asp:ListItem >2</asp:ListItem>
<asp:ListItem >3</asp:ListItem>
</asp:DropDownList>
</form>
Additionally, please check the rendered html and find if it is correct on
the client side. If the problem is still not resolved, please past some
lines of code here then I might be able to work out what the problem is.
Best regards,
Lewis
This posting is provided "AS IS" with no warranties, and confers no rights.
--------------------
| From:
da***@whitaker.co.uk (Zeebra3)
| Newsgroups: microsoft.public.dotnet.framework.aspnet
| Subject: calling clientside js with onchange event
| Date: 5 Aug 2003 09:15:22 -0700
| Organization:
http://groups.google.com/
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|
| Here goes: I have a web form with several asp:dropdownlists, with
| which, when selection is changed I want to fire an event defined in
| some clientside js.
|
| The content of the clientside code is dependant on data collected in
| the code behind on the server. I have set AutoPostback to false for
| the controls and added lines such as
| cboMyCombo1.Attributes.Add("onchange", "MyCombos_OnChange('1')");
| in the Page_Load event, which is rendered OK when I view the source of
| the page.
| I wanted to use RegisterClientScriptBlock to get the client js into
| the page, but found that it didn't put the code into the <head> tag,
| but into the <form> tag. After some research I deemed it necessary to
| get the js into the <head> tag and so I added an id and runat=server
| to the head tag.
| At design time I have some script already declared in the head tag so
| I got the InnerHtml property of the head tag in the Page_Load event
| and appended some more script within an additional <script> tags.
|
| When rendered and looking at the source, everything appears to be
| where I want it to be on the page. The onchange attributes are there
| and the 'MyCombos_OnChange' js function is within the head tag.
| However, you've guessed it, I get the good old message
| "Microsoft JScript runtime error: Object expected" suggesting that the
| 'MyCombos_OnChange' function called from the onchange attribute is not
| defined.
| Interestingly, if I change the cboMyCombo1.Attributes.Add call in
| Page_Load to add the attribute onchange and call a function that is
| already hard coded into the page, this function is called OK. I have
| also tried swapping round the order in which hard coded client js and
| dynamic js appears, even taken out all hard coded client js. I just
| can't get my onchange event to call a dynamically created js function
| even when it is within the head tag.
| I may be overlooking something, but I've exhausted all posts similar
| to this problem and am now seeking inspiration.
| Thanks for any help with this
|
