Chart is not defined

Error: chart is not defined

This error occurs when the variable “chart” is not defined in the JavaScript code. It means that you are
trying to access or manipulate a variable called “chart” that has not been declared or assigned a value
before its usage.

Examples:

Example 1:

    <script>
      // Accessing an undefined variable 'chart'
      console.log(chart); // Uncaught ReferenceError: chart is not defined
    </script>
  

In the above example, we are trying to access the variable “chart” using the console.log() function.
However, since the variable is not declared or defined before it is used, it throws a ReferenceError.

Example 2:

    <script>
      // Declaring an undefined variable 'chart'
      var chart;
      
      // Manipulating the 'chart' variable
      chart.draw(); // Uncaught ReferenceError: chart is not defined
    </script>
  

In this example, we first declare a variable called “chart” but don’t assign any value to it.
Then, we try to manipulate the variable by calling a method on it (e.g., draw()). Since the variable
is not assigned any value or object with a draw() method, it throws a ReferenceError.

Solution:

To resolve this error, you need to make sure that the variable “chart” is properly declared and defined
before it is used. This can be done by either assigning a value to the variable or creating an object
that contains the necessary methods and properties.

Example:

    <script>
      // Assigning a value to the 'chart' variable
      var chart = "My Chart";
      
      // Accessing the 'chart' variable
      console.log(chart); // Output: My Chart
    </script>
  

In this example, we assign a string value “My Chart” to the variable “chart”. Then, we access and log
the value of the variable, which produces the expected output “My Chart”.