How to Dynamically Update a Google Chart with AJAX and PHP?

Redraw Google Chart Based on User Input via AJAX Request

This question centers on dynamically updating a Google chart based on user selection from a drop-down menu using AJAX. The original code resulted in an error, but a solution is provided by utilizing PHP to format data in JSON form acceptable to Google.

The approach involves using PHP to retrieve and format data from a database and sending it to the client-side via AJAX. On the client-side, JavaScript handles the AJAX request, creates a Google visualization DataTable from the JSON response, and draws the chart.

The key components of the solution are:

• Using PHP's mysql_* functions to connect to the database and execute the SQL query.
• Formatting the data in the data.addRow() format acceptable to Google Charts, with row values represented as objects containing v (value) and f (formatted value) properties.
• Sending the formatted data to the client as a JSON response.
• In JavaScript, using AJAX (jQuery's $.ajax() method) to make the request and handle the response, where the data is parsed into a DataTable and used to draw the chart.

This approach ensures responsive chart updates based on user input, preventing the error encountered in the original code.

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