How do I force the display of a decimal in an ExtJS NumberField to a certain precision?

Question

I have a form with a NumberField that gets values of type float from JSON. If the values happen to be whole numbers, then no decimal places are sho

Answer 1

This code works great for me. It wont work with out the "ValueToRow" override in ExtJS 4.2.0.

var myNumberField = Ext.extend(Ext.form.NumberField, {
    setValue : function(v){
        v = typeof v == 'number' ? v : String(v).replace(this.decimalSeparator, ".");
        v = isNaN(v) ? '' : String(v).replace(".", this.decimalSeparator);
        return Ext.form.NumberField.superclass.setValue.call(this, v);
    },
    fixPrecision : function(value){
        var nan = isNaN(value);
        if(!this.allowDecimals || this.decimalPrecision == -1 || nan || !value){
        return nan ? '' : value;
        }
        var val = parseFloat(value).toFixed(this.decimalPrecision);
        return val;
    },
    valueToRaw: function(value) {
        var me = this,
        decimalSeparator = me.decimalSeparator;
        value = me.parseValue(value);
        value = me.fixPrecision(value);
        value = Ext.isNumber(value) ? value : parseFloat(String(value).replace(decimalSeparator, '.'));
        value = isNaN(value) ? '' : String(value).replace('.', decimalSeparator);
        return me.fixPrecision(value);
    }
});

...
...
items: [new myNumberField({
        id  : 'net',
        fieldLabel: 'Net Sales',
        allowBlank:false,
        decimalPrecision:2
    })

Reference: How to keep the trailing zeros in Ext.form.field.Number ?