function onInput()
    {
        if (validatorCallback)
            validate();
        if (instant)
            apply();
    }
@param {string} label
@param {!WebInspector.Setting} setting
@param {boolean} numeric
@param {number=} maxLength
@param {string=} width
@param {function(string):?string=} validatorCallback
@param {boolean=} instant
@param {boolean=} clearForZero
@param {string=} placeholder
@return {!Element}