services/self-service/src/main/resources/webapp/src/app/core/util/checkUtils.ts

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

export class CheckUtils {
  public static isJSON(str) {
    try {
      JSON.parse(str);
    } catch (e) {
      return false;
    }
    return true;
  }

  public static isNumberKey($event): boolean {
    const charCode = ($event.which) ? $event.which : $event.keyCode;
    if (charCode !== 46 && charCode > 31 && (charCode < 48 || charCode > 57)) {
      $event.preventDefault();
      return false;
    }
    return true;
  }
}