Utilizing Observable Data in Angular 4 TypeScript Components

Looking to extract and assign a JSON value obtained from an API into a variable. Here is an example:

TS

this.graphicService.getDatas().subscribe(datas => {
    this.datas = datas;
    console.log(datas);
});

test = this.datas[0].subdimensions[0].entry;

HTML

{{test}}

An error is displayed in the console:

ERROR Error: Uncaught (in promise): TypeError: Cannot read property 'subdimensions' of undefined
TypeError: Cannot read property 'subdimensions' of undefined
    at new GraphicsComponent (graphics.component.ts:33)...

However, it does function correctly if directly used in HTML as shown below:

{{datas[0]?.subdimensions[0].entry}}

The data will then print accurately. ..

javascriptangulartypescript

Answer №1

Give this a shot:

let example;
this.visualizationService.retrieveData().subscribe(data => {
    this.data = data;
    console.log(data);
    example = this.data[0].subdimensions[0].entry;
});

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