Hi Thomas,
Thanks for your response.
I am not using MVP .I am not using PlaceController . So I only relay on
History.addValueChangeHandler.
What problem I am facing is ...
In GWT have History ,HistoryImpl classes.
HistoryImpl class have newItem() , newItemOnEvent() these two final
methods will change the $wnd.location.hash value when we click on browser
back button.
Moreover, GWT have different HistoryImpl classes for browser specific
and contain native methods to update the $wnd.location.hash .
Like under package com.google.gwt.user.client.impl
HistoryImpl
HistoryImplIE6
HistoryImplMozilla
HistoryImplSafari
HistoryImplTimer
*For Example :* In Mozilla browser , if I click on browser back
button,control is going to HistoryImplMozilla (see below GWT
implementation in History.gwt.xml) and change the the browser URL in
"nativeUpdate" method and then control will come to
History.addValueChangeHandler (onValueChange()) at this time the browser
URL already modified and difficult to get the original URL from here.
History.gwt.xml
<!-- Mozilla has a slightly different history implementation than the
-->
<!-- standard case.
-->
<replace-with class="com.google.gwt.user.client.impl.HistoryImplMozilla">
<when-type-is class="com.google.gwt.user.client.impl.HistoryImpl"/>
<any>
<when-property-is name="user.agent" value="gecko1_8"/>
<when-property-is name="user.agent" value="gecko"/>
</any>
</replace-with>
How to show the alert message in this time ? in Alert message if user
clicks to NO button means wants to stay in same page then its difficult to
get the original URL . because original URL already modified.
In which place is suitable for showing Alert message to the user if form
is dirty and clicks on browser back button.
Its difficult to customize the HistoryImpl class for newItem() ,
newItemOnEvent() these are final methods can't over ride in sub classes. If
i do that (copy entire class and done the customize) I need to customize
History ,HistoryImpl ,HistoryImplIE6,HistoryImplMozilla , HistoryImplSafari
,HistoryImplTimer.
Can you please suggest the best way to handle this problem ?
Thanks
On Tuesday, January 22, 2013 2:56:17 PM UTC+5:30, Thomas Broyer wrote:
>
>
>
> On Monday, January 21, 2013 6:31:12 PM UTC+1, Darsha Sai wrote:
>>
>> Hi ,
>>
>> I want to display alert message when user click on browser back
>> button/forward button/refresh buttons if form is dirty.
>>
>> How to capture browser back button/forward button in gwt ?
>>
>
> You can't. You can only react to navigation, either within the app
> (History.addValueChangeHandler) or out of the app
> (Window.addWindowClosingHandler).
> There are APIs that wrap them both though: adding a
> PlaceChangeRequestEvent.Handler to the eventbus if you use the
> PlaceController, or implementing mayStop() in your activity if you use
> activities.
>
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