Attempting to retrieve information from a JSON file has been an issue for me. Here is the code snippet:
ngOnInit() {
this.http.get('assets/json/buildings.json', { responseType: 'text'})
.map(response => response)
.subscribe(result => this.data = result);
console.log(this.data);
}
However, the output I receive is undefined. I would greatly appreciate some assistance in understanding why my data is not being retrieved successfully.
When you encounter the error 'undefined,' it is likely due to calling the log function immediately after setting a value that is retrieved asynchronously. The asynchronous nature of the response means that the value may not be set until the API returns a result.
To address this issue, you can modify your code as follows:
this.http.get('assets/json/buildings.json', { responseType: 'text'})
.map(response => response)
.subscribe(result => {
this.data = result;
console.log(this.data);
});
By implementing this change, you will wait for the data to be retrieved before attempting to log it, ensuring that the value is available when you try to access it.
What is the purpose of utilizing the map function if all you are doing is fetching and displaying the response data?
this.http.get('assets/json/buildings.json', { responseType: 'text'})
.subscribe(response => {
this.data = response;
console.log(this.data);
});
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