Скачать или смотреть How to Make Your Google Chart Resize Perfectly on Window Changes

Discover how to properly implement resizing for your `Google Chart` in JavaScript, ensuring it responds correctly to both enlargements and reductions of your browser window size.
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This video is based on the question https://stackoverflow.com/q/66738335/ asked by the user 'Idreece Khan' ( https://stackoverflow.com/u/13335083/ ) and on the answer https://stackoverflow.com/a/66746217/ provided by the user 'WhiteHat' ( https://stackoverflow.com/u/5090771/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Make Your Google Chart Resize Perfectly on Window Changes

When working with data visualizations in web applications, it's essential to ensure that charts resize appropriately according to the changes in the browser window. A common issue developers encounter is that while a chart may expand when the window size increases, it does not shrink when the window size decreases. This scenario can occur due to improper handling of the chart drawing and resizing logic in your JavaScript code.

In this guide, we will explore how to fix this issue by properly implementing a resize function for your Google Chart. Let's break down the solution step-by-step.

Understanding the Problem

You may have noticed that even though your chart is wrapped in a resize function, it fails to reduce its size when the browser window is resized smaller. This behavior typically occurs because the chart is not cleared before redrawing it, causing the chart's container to retain its larger size.

Common Missteps

Not Clearing the Chart: If the chart element is not cleared before redrawing, it won't adjust to fit its container.

Redundant Loading Calls: The Google Charts loading function needs to be called only once. Repeating it in the resize event is unnecessary and can lead to performance issues.

The Solution

To resolve the resizing issue, follow the steps below to adjust your code:

Step 1: Clear the Chart

Before redrawing the chart, you need to clear the previous chart instance. Use the chart.clearChart() method to ensure the chart starts from a clean state.

Step 2: Optimize the Load Calls

Call the Google Charts loading function just once during the initial page load. There's no need to include it in the resize event handler.

Step 3: Implement the Resize Logic

Here’s an example implementation demonstrating these changes:

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

Key Components Explained

chart.clearChart(): This method clears the previous chart, allowing for a successful redraw.

Event Listeners: Utilizing the window.addEventListener('resize', drawChart); ensures that the chart is redrawn whenever the window is resized.

Final Thoughts

Implementing a functional resize capability for your Google Chart can significantly enhance the user experience by keeping visualizations responsive and visually appealing. By clearing the chart before redrawing and simplifying the loading logic, you can effectively resolve the resizing issues you've been facing.

Feel free to test out the provided code snippet in your project, and enjoy the flexibility of dynamic charts that resize gracefully!