Using the Keyboard with a Web Page Calculator
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In this fourth part of a six-part series on building a web page calculator, we'll delve more deeply into the functions. We start with the operator(ID) function, and then take a closer look at events. We'll wrap up by starting to show how to use the keyboard with the calculator.
Details of the operator(ID) Function
This function uses three global variables. These variables are:
//argument for top level JavaScript eval() function
var evalString = ""
//the memory (store) is a variable
var memVar = "";
//after the operation +, -, X and /, the display has to be cleared. We need for this the variable
var toClearDisplay = false;
I talked about these variables before. It suffices here to read the comments. I will come back to the global variables after I explain the operator() function. The operator function has two code segments.
Next: The First Code Segment >>
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