Calling Javascript function from VB.Net

[mguwc]

Hi - I've have an issue with PostBack of a page.

I have created a web application where the default page is in two sections (frames) - the top [banner] and the bottom [content].

There is a menu in my content section that navigates from page to page without links. By this I mean that when you are using the menu, you can go to "fresh" new pages within the content.

When you navigate from page to page from within the contents of the page (example: from the demographics page you can navigate to the activity page with the client id being the link) - OnLoad of each page, the Top [Banner] is reloaded. The Top [Banner] will then give you
client specific information....

If you navigate to a page FROM the menu, then the Top [Banner] gives you a generic Title and Picture.

My Javascript function that is called onload of each page is :

function init()
{
parent.frames['banner'].location.reload();
}

I have tried the following to avoid the Top reloading with every postback:

function init()
{
if (!IsPostBack)
{
}
parent.frames['banner'].location.reload();
}

However, when it goes through the process, it crashes with the following error:

Microsoft JScript runtime error: 'IsPostBack' is undefined

I don't understand why this occurs. Can someone please help me? Is there a way to call the javascript from VB script. Example:

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

If Not Page.IsPostBack Then

Parent.Frame[Banner].Attributes("onload")= "javascript:init();"

I have tried this, however this does not work...Any ideas?

- Maria

 

[ca8msm]

Microsoft JScript runtime error: 'IsPostBack' is undefined

The reason that you are getting that error is because you are trying to use an ASP.NET method (IsPostBack) from a different language (JavaScript). The JavaScript engine will simpply think that you are referring to a javascript variable named IsPostBack and because you haven't declared one, it produces that error message.

What you should so, is use the ASP.NET IsPostBack method to determine if a postback exists, and if it doesn't then add the JavaScript function to the page via Page.RegisterStartUpScript.


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