Ronny,
On 9/11/07,
[hidden email] <
[hidden email]> wrote:
> What would be the best way to intercept any change to an instance? Is there an event that can be caught indicating the model instance has changed?
> We'd like to give users the opportunity to save unsaved changes before browsing away from the application.
Yes, you can use xforms-value-changed event for this. In fact the
Government Forms example does exactly what you describe above. In
essence, it catches the xforms-value-changed event at the "top of the
page", stores in instance that there are unsaved data.
<xforms:action ev:event="xforms-value-changed">
<xforms:setvalue model="common-model"
ref="instance('control-instance')/data-status">dirty</xforms:setvalue>
</xforms:action>
You can then use this information to enable a "save" button.
If you also want to have a confirmation dialog when users navigates
away from the page and the data isn't saved, you need to have a
control bound to the data-status node. Put an id on that control (say
"data-status"). Make the control hidden with some CSS (display: none).
Then put in JavaScript that looks like:
window.onbeforeunload = function() {
if(ORBEON.xforms.Document.getValue('data-status') == 'dirty'){
return "Data not saved, are you sure you want to go to another
without saving?";
}
}
I hope this helps,
Alex
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