Very unfortunately ExtJS doesn’t offer a validator for its checkbox component.
Normally a validator checks whether a field is valid and takes care of displaying an error message if not. For a checkbox we would like that to happen if the checkbox is not selected.
Overriding the validate function of the checkbox we can provide such a [...]

[Read more →]

When you are doing client/server communication with ExtJS you probably run into the problem that you want to handle server side errors in a generic way.
A solution that I found is to override the handleFailure function in the Ext.data.Connection class:

Ext.data.Connection.prototype._handleFailure = Ext.data.Connection.prototype.handleFailure;
Ext.data.Connection.prototype.handleFailure = function(response, e) {
var errorText = Ext.DomQuery.selectValue("Reason/Text", response.responseXML, "Unknown Error");
Ext.Msg.alert(’Error’, errorText);
 
Ext.data.Connection.prototype._handleFailure.call(this, response, e);
};

This [...]

[Read more →]