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Home/ Questions/Q 9177409
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Editorial Team
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Editorial Team
Asked: June 17, 20262026-06-17T17:19:14+00:00 2026-06-17T17:19:14+00:00

Im try write custom dialogs, for my app. I think wrote a subclass of

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Im try write custom dialogs, for my app. I think wrote a subclass of Ext.window.MessageBox, and pass by parameters the title and message.
And i wrote:

Ext.define('CRUDManantiales.view.dialog.NoUserSelected',{
    extend: 'Ext.window.MessageBox',
    alias: 'dialog.noUserSelected',

    initComponent: function(){
        this.title = this.titulo;
        this.msg = 'No se ha seleccionado ningún usuario.\n Asegurese de haber elegido un usuario\n\
                           al cual aplicarle la operación.';
        this.buttons = Ext.MessageBox.OK;
        this.icon = Ext.MessageBox.ERROR;
        this.callParent(arguments)
    }
})

But when create and show the dialog:

Ext.create('CRUDManantiales.view.dialog.NoUserSelected',{titulo: 'Agregar administrador'}).show();

Firebug says:

TypeError: cfg is undefined on MessageBox.js
“NetworkError: 404 Not Found – http://appadmin.local/x-message-box-error“

Any idea ?
Note: im using ExtJs 4.1

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  1. Editorial Team
    Editorial Team
    2026-06-17T17:19:15+00:00Added an answer on June 17, 2026 at 5:19 pm

    You need to pass an config object to the method Ext.Msg.show(cfg), not set the component config.

    You can write custom method, as:

    ...
    initComponent: function(){
        this.callParent(arguments)
    },
    
    showError: function() {
        var cfg = {
            title: this.titulo,
            msg: 'No se ha seleccionado ningún usuario.\n Asegurese de haber elegido un usuario\n\al cual aplicarle la operación.',
            buttons: Ext.MessageBox.OK,
            icon: Ext.MessageBox.ERROR
        };
        this.show(cfg);
    }
    ...
    

    And show dialog:

    Ext.create('CRUDManantiales.view.dialog.NoUserSelected',{titulo: 'Agregar administrador'}).showError();
    
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