I create a button within a class and return it to be displayed. I have the
event handlers within the class definition and I'd like to be able to access
the class variables from within the handler, is this possible?
Something like this:
qx.Class.define("myapp.Class1",
{
extend: qx.core.Object,
construct: function() { },
members:
{
_button: null,
_count: 0,
render : function()
{
this._button = this.makeButton();
this._button.addListener("execute", this.click);
return this._button;
},
makeButton : function()
{
return new qx.ui.form.Button("First Button",
"icon/22/apps/internet-web-browser.png");
},
click : function(e)
{
this._count++;
alert(this._count);
}
}
});
// Document is the application root
var doc = this.getRoot();
// Add button to document at fixed coordinates
var c1 = new myapp.Class1();
doc.add(c1.render());
This should show a button that pops up an alert box with the current value
of _count each click. In the playground, however, it just shows NaN, which,
I assume, means the event handler does not have access to class variables.
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