It may sometimes be needed to ask the user if he really wants to close an Ext window. Naturally, we would use Message Box for this purpose, and we would listen to beforeclose returning false if the user does not want to close, answers “No.”
And now comes the problem: Message Box is, unlike browser alert dialog, asynchronous. The execution of code does not stop when it is displayed but it immediately continues. We do not have time to evaluate the user response before returning false from the beforeclose event to cancel the close.
Fortunately, solution is easy:
// vim: sw=4:ts=4:nu:nospell:fdc=4
/*global Ext:true */
/*jslint browser: true, devel:true, sloppy: true, white: true, plusplus: true */
/*
This file is part of Single File ExtJS 5 Application Example
Copyright (c) 2014, Jozef Sakalos, Saki
Package: Confirm Window Close
Author: Jozef Sakalos, Saki
Contact: https://learnfromsaki.com/contact
Date: 24. June 2014
Commercial License
Developer, or the specified number of developers, may use this file in any number
of projects during the license period in accordance with the license purchased.
Uses other than including the file in a project are prohibited.
See https://learnfromsaki.com/licensing for details.
*/
/**
* # How to confirm window close
*/
// Ext.app.Application is not contained in ext.js
// so we need to load it synchronously
Ext.syncRequire([
'Ext.app.Application'
]);
// Instantiate application
Ext.application({
name:'MyApp'
,requires:[
'Ext.window.MessageBox'
] // eo requires
// application entry point
,launch:function() {
Ext.create('Ext.window.Window', {
title:'Test'
,width:400
,height:300
,autoShow:true
,listeners:{
beforeclose:function(win) {
// user has already answered yes
if(win.closeMe) {
win.closeMe = false;
return true;
}
// ask user if really close
Ext.Msg.show({
title:'Close confirmation'
,msg:'Really close?'
,buttons:Ext.Msg.YESNO
,callback:function(btn) {
if('yes' === btn) {
// save the user answer
win.closeMe = true;
// call close once again
win.close();
}
}
});
// Always cancel closing if we get here
return false;
}
}
});
} // eo function launch
});
// eof
I'm a well seasoned developer, consultant and educator of web applications based mainly on Sencha libraries, PHP, MySQL and Node.js. Besides (Apple) computers, I love photography and mountain biking.
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3 Responses
Why not just call win.destroy() when the user confirms closing the window?
When you call destroy, the object with window, all descendant components will be destroyed too and window is removed from the DOM. However you have option select what do you want to do with window – I use mostly hide action instead of destroy. Check ExtJS doc: http://docs.sencha.com/extjs/5.0/apidocs/#!/api/Ext.panel.Panel-cfg-closeAction
In Saki’s example the window will be destroyed because defautl close action is ‘destroy’
Yes, exactly! Thanks Michal.