How to Properly Call a JavaScript Function from an HTML Button?

Calling a JavaScript Function with an HTML Button

You are attempting to call a JavaScript function, CapacityChart(), using an HTML button, but the function is not executing properly.

The first approach involves defining the onclick event handler directly within the HTML element:

<input type="button" value="Capacity Chart" onclick="CapacityChart();">

However, defining event handlers in HTML has limitations. Modern browsers prefer using JavaScript event listeners for better code organization and maintenance.

Using JavaScript, you can assign an event listener to the button's onclick event using the addEventListener() method:

document.getElementById("buttonId").addEventListener("click", CapacityChart);

Another option is to attach an anonymous function directly to the onclick property:

document.getElementById("buttonId").onclick = function() { CapacityChart(); };

The problem with your CapacityChart() function likely lies elsewhere. Try using the following code to address the issue:

CapacityWindow.document.open("text/html");
CapacityWindow.document.write(s);
CapacityWindow.document.close();

Additionally, to ensure cross-browser compatibility, replace any instances of document.all with document.getElementById in your code.

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