svogv/esm2015/lib/decorators/val-compare.decorator.js

A decorator based approach for model driven forms, including an advanced DataGrid and a TreeView component.

/**
 * The compare decorator compares two field's values and
 * shows an error message on the decorated field. The other field (compared to) does
 * not has a decorator nor receives a message.
 *
 * @param withProperty A string that represents the compared field's name.
 * @param msg A custom message.
 *
 */
export function Compare(withProperty, msg) {
    function compareInternalSetup(target, key) {
        // create a helper property to transport a meta data value
        Object.defineProperty(target, `__hasCompareProperty__${key}`, {
            value: true,
            enumerable: false,
            configurable: false
        });
        Object.defineProperty(target, `__withCompare__${key}`, {
            value: withProperty,
            enumerable: false,
            configurable: false
        });
        Object.defineProperty(target, `__errCompareProperty__${key}`, {
            value: msg
                || `The field ${key} must have the same value as field ${withProperty}`,
            enumerable: false,
            configurable: false
        });
    }
    // the original decorator
    function compareInternal(target, property) {
        compareInternalSetup(target, property.toString());
    }
    // return the decorator
    return compareInternal;
}
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