@digital-blueprint/dispatch-app/src/person-select.js

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import {PersonSelect} from '@dbp-toolkit/person-select';
import {ScopedElementsMixin} from '@open-wc/scoped-elements';

export class CustomPersonSelect extends ScopedElementsMixin(PersonSelect) {
    // If the search term matches a matriculationNumber, we search for that,
    // otherwise the name
    buildUrlData(select, params) {
        let term = params.term.trim();
        let data = {
            includeLocal: 'matriculationNumber',
        };
        if (this.isValidMatriculationNumber(term)) {
            data['queryLocal'] = 'matriculationNumber:' + term;
        } else {
            data['search'] = term;
        }
        return data;
    }

    // Includes the matriculationNumber if possible
    formatPerson(select, person) {
        let text = person['givenName'] ?? '';
        if (person['familyName']) {
            text += ` ${person['familyName']}`;
        }

        let mat = person.localData.matriculationNumber;
        if (mat !== null && this.isValidMatriculationNumber(mat)) {
            text += ` (${mat})`;
        }

        return text;
    }

    /**
     * @param {string} mat
     * @returns {boolean}
     */
    isValidMatriculationNumber(mat) {
        return mat.match(/^[0-9]{8}$/g);
    }
}