svogv/esm2015/lib/decorators/hint-placeholder.decorator.js

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

/**
 * The Placeholder decorator.
 *
 * The placeholder adds the given text as a watermark to any input fields.
 * There is no function in the {@link DataGridComponent}.
 *
 * @param name          The Name that appears in form fields as a watermark.
 */
export function Placeholder(name) {
    function placeholderInternalSetup(target, key) {
        // create a helper property to transport a meta data value
        Object.defineProperty(target, `__watermark__${key}`, {
            value: name,
            enumerable: false,
            configurable: false
        });
        Object.defineProperty(target, `__hasWatermark__${key}`, {
            value: true,
            enumerable: false,
            configurable: false
        });
    }
    // the original decorator
    function placeholderInternal(target, property) {
        placeholderInternalSetup(target, property.toString());
    }
    // return the decorator
    return placeholderInternal;
}
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