Error: The property 'process' cannot be read because it is not defined

Seeking help with a code issue

Any advice on best practices would be greatly appreciated. Thank you!

An error has occurred: TypeError: Cannot read property 'process' of undefined

myComponent.ts


  ProcessInfo: any | false;


  showSaveItems = () => {
    this.typeCategory = [];
    this.dataTypesLoop = [];

    if (this.ProcessInfo.process.data.mortgage.length) {
      for (let i = 0; i < this.ProcessInfo.process.data.mortgage.length; i++) {
        if (this.ProcessInfo.process.data.mortgage[i].mortgageHeader !== null) {
          const findItem = this.categories.find(
            obj =>
              obj.value ==
              this.ProcessInfo.process.data.mortgage[i].mortgageHeader.category
          );

        }
      }
    }

    this.dataTypes = new Set(this.dataTypesLoop);
    return new Set(this.typeCategory);
  };

myComponent.html


  <li *ngFor="let item of showSaveItems()">
       <strong>{{ item.text }}</strong>
   </li>

Answer №1

Verifying the existence of the specified path is recommended

 if (this.ProcessInfo && this.ProcessInfo.process && this.ProcessInfo.process.data && this.ProcessInfo.process.data.mortgage && this.ProcessInfo.process.data.mortgage.length>0) {

Answer №2

Make sure to initialize your parameter before using it:

  ProcessInfo: any | false = false;

By using ':' you are only setting the type, its value remains 'undefined' until you use '=';

To access the process parameter of your object, first check if it exists:

if (this.ProcessInfo.hasOwnProperty('process')) {
  if (this.ProcessInfo.process.data.mortgage.length) {
      for (let i = 0; i < this.ProcessInfo.process.data.mortgage.length; i++) {
        if (this.ProcessInfo.process.data.mortgage[i].mortgageHeader !== null) {
          const findItem = this.categories.find(
            obj =>
              obj.value ==
              this.ProcessInfo.process.data.mortgage[i].mortgageHeader.category
          );

        }
      }
   }
}

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