Скачать или смотреть Solving the Angular Highcharts Data Display Issue When Fetching from API

Discover how to address the `Angular Highcharts not displaying` issue effectively by learning about potential race conditions and how to utilize the Highcharts API properly.
---
This video is based on the question https://stackoverflow.com/q/77104799/ asked by the user 'Chris A' ( https://stackoverflow.com/u/1649280/ ) and on the answer https://stackoverflow.com/a/78175965/ provided by the user 'Chris A' ( https://stackoverflow.com/u/1649280/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, comments, revision history etc. For example, the original title of the Question was: Angular Highcharts not displaying data from API

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Introduction

As developers, we often encounter frustrating challenges when working with frontend libraries and frameworks. One common problem is when Angular Highcharts fails to display data fetched from an API. This can be particularly puzzling when similar implementations work fine in other parts of the application. In this guide, we will explore one such scenario and how to approach solving this problem.

The Problem: Highcharts Not Displaying Data

Imagine you have built a charting component designed to show your liquidity data. While it works sometimes, it frequently fails, displaying nothing but a blank space. You suspect a race condition is at play, especially since the chart occasionally renders but you often see errors like:

Cannot read properties of undefined (reading 'setData')

This behavior can make it challenging to use Highcharts effectively in your Angular application. Let's take a closer look at how to debug this and ensure your data displays as expected.

Understanding the Solution

General Structure

To understand the problem, first, we need to familiarize ourselves with the structure of the chart component and its life cycle.

Column Component Overview

The column.component.ts file constructs the chart options and handles data updates. Here's a simplified version of what it looks like:

[[See Video to Reveal this Text or Code Snippet]]

Key Areas to Focus On

1. Initialization and Data Management

Make sure that the data being passed to the chart is initialized properly. The ngOnInit and ngOnChanges lifecycle hooks play a crucial role here. ngOnInit sets up your chart while ngOnChanges updates it whenever inputs change.

2. Race Conditions

A typical issue with rendering is the race condition. The chart may attempt to render before the data is fully retrieved. Watch for:

Asynchronous data fetching: Ensure that the API call completes and the data is ready before calling updateChart().

Use of timeouts: It is a good practice to delay the resize event to allow time for the data to be available.

3. Callback Function

The chartCallback function may provide a good opportunity to deal with initialization issues. If it’s called too early, the references needed aren’t established:

[[See Video to Reveal this Text or Code Snippet]]

4. Logging and Debugging

Add helpful logs around your updates to diagnose. For instance:

[[See Video to Reveal this Text or Code Snippet]]

This will help you determine if at the time you're calling setData, the chartRef and liquidityChart have the expected values.

Conclusion

Although the issue of Angular Highcharts not displaying data from API can be tricky, a careful approach utilizing lifecycle hooks, ensuring data readiness, and implementing effective debugging can greatly enhance your chances of success. Occasionally, a simple library update or bug fixes can also resolve such issues without any direct code changes. If you still encounter problems, revisit your component’s logic and ensure all data flows are clear and managed correctly.



By focusing on these areas and understanding how to leverage the API correctly, you can ensure a smoother experience when displaying your data using Angular Highcharts. Happy coding!