The issue arises when attempting to call a method from the same service within jsPDF in an Angular environment

Question

The issue arises when attempting to call a method from the same service within jsPDF in an Angular environment

Below you will find my Angular project's pdfService. I am facing an issue where calling the this.formatter() method inside myPDF is not functioning properly.

export class pdfService { 

    formatter(value: number): string {
        return new Intl.NumberFormat('en-IN', {style: 'decimal', currency: 'INR'}).format(value);
    }

    myPDF() {
        const doc = new jsPDF();
        doc.text('Values', 10, 25, 'left');
        doc.text(this.formatter(1000), 10, 25, 'left');
        doc.text(this.formatter(10000), 10, 35, 'left');

        window.open(doc.output('bloburl'));
    }

}

When I include the method within myPDF, it works as expected. See code below:

function formatter(value: number): string {
    return new Intl.NumberFormat('en-IN', {style: 'decimal', currency: 'INR'}).format(value);
}

I require the use of the formatter method in multiple PDF methods. Where should I place it?

Note: Repeating the formatter method in all PDF methods is one possible solution but not the ideal approach.

javascript angular typescript jspdf

Answer 1

Answer №1

It's crucial to consider how you invoke the myPDF function, as it can impact the binding of this within the function. When calling the function without any context, the value of this may become undefined. To address this issue, you can bind the function reference to the specific instance. Here's a snippet of code to illustrate this concept:

export class MyClass {
  value = 5;

  func() {
    console.log(this.value);
  }
}


const instance = new MyClass();
instance.func(); // This will work as expected.

const referenceToFunc = instance.func;
referenceToFunc(); // This will not work as intended.

const boundReferenceToFunc = instance.func.bind(instance);
boundReferenceToFunc(); // The correct way to ensure proper binding.

For more detailed information, check out this answer.

Answer 2

It's crucial to consider how you invoke the myPDF function, as it can impact the binding of this within the function. When calling the function without any context, the value of this may become undefined. To address this issue, you can bind the function reference to the specific instance. Here's a snippet of code to illustrate this concept:

export class MyClass {
  value = 5;

  func() {
    console.log(this.value);
  }
}


const instance = new MyClass();
instance.func(); // This will work as expected.

const referenceToFunc = instance.func;
referenceToFunc(); // This will not work as intended.

const boundReferenceToFunc = instance.func.bind(instance);
boundReferenceToFunc(); // The correct way to ensure proper binding.

For more detailed information, check out this answer.

The issue arises when attempting to call a method from the same service within jsPDF in an Angular environment

Answer №1

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