IT:AD:Sencha Touch:Reference:HowTo:Use a CurrencyField

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You can't use one…as there isn't one.

You have to make your own:

Ext.define('CurrencyField', {
    extend: 'Ext.form.field.Number',

    // Some sensible defaults
    allowDecimals: true,
    hideTrigger: true,
    keyNavEnabled: false,
    mouseWheelEnabled: false,

    valueToRaw: function() {
        var value = this.parseValue(this.callParent(arguments));

        return Ext.util.Format.number(value, '0.00');
    }
});

Ext.create('CurrencyField', {
    renderTo: Ext.getBody()
});