How to Fix Missing Line Data in Your Vue.js Line Chart Using Chart.js

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The Problem

Imagine you have a line chart that presents financial data over 12 months. You want to allow users to select a year and a loan_type from dropdowns. Upon selection, the chart is supposed to load two lines: one for annual_payment and another for scheduled_payment. Unfortunately, when attempting to display the chart, it doesn’t show any lines.

Here's a summary of the scenario:

Users select a year and loan type.

Data is fetched based on these selections.

The chart, expected to visually represent this data, fails to display any lines.

Understanding the Cause

Upon careful examination of the data handling code in your Vue component, there seems to be a breakdown in how the fetched data is being assigned to the chart datasets. Each dataset (line) in the chart has a data property that should be populated with the correct values from the API response.

The Key Issues

Data Assignment: The code is currently only populating the first dataset with the entire response data, while the second dataset remains unassigned.

JSON Structure: The response from the controller should return proper arrays for both the payment_amount and the scheduled_amount.

The Solution

To resolve the issue of the missing lines, we need to make sure that each dataset is correctly assigned its corresponding data. Here’s how you can modify your code:

Step-by-Step Fix

Fetch Data Correctly: Confirm that your server-side logic is correctly returning an array where each entry has both payment_amount and scheduled_amount.

Correct Data Assignment: Adjust the code in your Vue component responsible for assigning data to the datasets, like so:

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

Explanation of the Adjustment

Conclusion

Feel free to implement these changes, and if you encounter further issues, don't hesitate to seek help from the community or revisit your data handling methods. Happy coding!