Updating Chart Data in Real Time
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To display real-time changes in your charts, you need to modify the underlying data and then refresh the chart so the new values appear. Start by accessing your chart instance, which is typically stored in a variable such as myChart.
If you want to change the data points in a dataset, assign a new array to the data property of the relevant dataset object within the chart's data.datasets array. You can also change the labels by updating the labels property.
Once you have made your changes, you must call the update() method on your chart instance. This method tells Chart.js to re-render the chart and display the latest data and labels. Without calling update(), any changes you make to the data or labels will not be shown on the chart.
This approach allows you to reflect new information instantly, which is especially useful for dashboards or visualizations that require live updates.
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How do I access the chart instance in my code?
Can you show an example of updating both data and labels?
What happens if I forget to call the update() method?
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script.js
index.html
styles.css
To display real-time changes in your charts, you need to modify the underlying data and then refresh the chart so the new values appear. Start by accessing your chart instance, which is typically stored in a variable such as myChart.
If you want to change the data points in a dataset, assign a new array to the data property of the relevant dataset object within the chart's data.datasets array. You can also change the labels by updating the labels property.
Once you have made your changes, you must call the update() method on your chart instance. This method tells Chart.js to re-render the chart and display the latest data and labels. Without calling update(), any changes you make to the data or labels will not be shown on the chart.
This approach allows you to reflect new information instantly, which is especially useful for dashboards or visualizations that require live updates.
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