Prevent backspace from being used when inside dhtmlxCombo

Suite and Optimus Suite 5
#1

Hello,

I have tried the following in order to prevent for unwanted usage of backspace, but the page ignores the “return false” and leaves my form anyhow:

           dhtmlxCombo__frm_fsmAfCountries.attachEvent("onKeyPressed", function(keyCode){
                if (keyCode == 8) {
                     if(confirm('Do you really want to leave this page?')) { return true; } else { return false; }
                }
           });

Any suggestions?

#2

Hello,

onKeyPressed event doesn’t return any value. You may try to redefine the private _onKey event handler to solve the problem:

[code]var setter = dhtmlXCombo.prototype._onKey;

dhtmlXCombo.prototype._onKey = function(e){
var combo=this.parentNode.combo;
(e||event).cancelBubble=true;
var keyCode=(e||event).keyCode;
if(keyCode==8&&combo.getComboText()=="")
return false
return setter.apply(this,arguments);
}[/code]

#3 
           var setter = dhtmlXCombo.prototype._onKey;
           dhtmlXCombo.prototype._onKey = function(e){
                var combo=this.parentNode.combo;
                (e||event).cancelBubble=true;
                var keyCode=(e||event).keyCode;
                if (keyCode==8&&combo.getComboText()=="") {
                     alert(Abort');
                }
                else {
                     alert('Continue');
//                     return setter.apply(this,arguments);
                }
           }

Does not work. I never get any alerts from function…

#4

locally the same approach works. I’ve attached the demo
sample.zip (17.5 KB)