cancelling changes

"Cancel all changes" functionality is implemented in PhotoEditorSample. Please, install PhotoEditorSample (it is included into installation package) and review how it works. If you will have some questions - feel free to contact us.

I found that "BODY's OnBeforeUnload fires twice in IE" is known bug. For example you can see this page:

http://www.dbforums.com/showthr....php?page=2&t=622842.

When ASP.NET renders page, it creates following Html code for LinkButton:

<a href="__doPostBack('PhotoEditorSample1$butRestore','');" ... ></a>

So, when you click the link in IE, IE fires onbeforeunload twice: firstly when meet href="", secondly during execution of __doPostBack.

To eliminate this you may use the following workaround: try to add # into href of A element. This way IE will interprete it as link to part of current page and will not call onbeforeunload event.

To use LinkButtons into your project you should do the following:

(I explain getting PhotoEditorSample.ascx as source for changes)

Changes in PhotoEditorSample.ascx:

1. Replace <asp:Button with <asp:LinkButton

2. Remove from <asp:LinkButton ID="butRestore" OnClick property.

Changes in Default.aspx:

1. Change Button to LinkButton into OnInit method.

Changes in PhotoEditorSample.ascx.cs:

1. Add following string to OnInit method:

butRestore.OnClientClick = "this.href = '#';if (this.disabled) return false;__doPostBack('" + butRestore.UniqueID+ "','');return false;";

Edited by user Tuesday, December 18, 2007 3:02:39 AM(UTC)  | Reason: Not specified

As I understand, you just want to get rid of using FindControl function on your page.

To do this you should add the following property to PhotoEditorSample.ascx.cs:

public Aurigma.PhotoEditor.PhotoEditorController PhotoEditorController
{
    get
    {
         return PhotoEditorController1;
    }
}

This way you will get possibility to use the following code on your page (for example Default.aspx)

protected void butRestore_Click(object sender, EventArgs e)
{
    PhotoEditorSample1.PhotoEditorController.EditingOptions = "";
}

To add handler to butRestore.Click event we use this code in Default.aspx:

protected override void OnInit(EventArgs e)
{
    base.OnInit(e);
    ((Button)PhotoEditorSample1.FindControl("butRestore")).Click += 
        new EventHandler(butRestore_Click);
    ((Button)PhotoEditorSample1.FindControl("butShow")).Click +=
        new EventHandler(butShow_Click);	
}

Edited by user Tuesday, December 18, 2007 3:03:02 AM(UTC)  | Reason: Not specified

I'm having some trouble with Firefox. It seems that the fix we did in this previous post isn't working for them.

It seems that when you have disabled="disabled" in the html, which doesn't validate, doesn't correspond to the check we're doing in the onclick event (e.g. if(this.disabled) ) for Firefox, I've tried using alert(this.disabled) and it is showing "undefined".

I've even tried to set an add_load method to fix it in script, but it hasn't worked, maybe you can help.

here is what I tried:

//fix for firefox and/or other standards compliant browsers
//if disabled is checked for in script it needs to be set in script
var el = document.getElementById("<%= saveButton.ClientID %>");
if(el)el.disabled=<%= (!saveButton.Enabled).ToString().ToLower() %>;

the result is that I'm getting an error when I click a disabled button in FireFox:

Invalid postback or callback argument. Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifies that aruments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.

thanks,

Nate

Edited by user Tuesday, December 18, 2007 3:03:25 AM(UTC)  | Reason: Not specified

To fix this I just set the onclick for a disabled button simply to "return false;" That way if it is disabled it never fires anything.

this seems to be working, but I still have one issue I'll start as a new topic