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It is hard to evaluate my solution when I do not have a complete example. So I’m not sure, but I hope the following helps you: It could be that you have a simple type error as the code
var input = document.getElementById("testId").value;
assigns a string value to the input variable. However, I think, you need an integer as input for your chart.
A solution could be:
var input = parseInt(document.getElementById("testId").value)
Although you have defined your input field as “number”, javascript does not use this type to convert the value automatically. So, you have to convert the value by yourself.
Source:stackexchange.com