A javascript function to double numbers
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Create a Web page named double.html whose HEAD includes the DoubleIt function. The page should contain a text box with an initial value of 1 and a button labeled "Double It". When the user clicks the button, the DoubleIt function should be called to double the contents of the text box.
If you start with a value of 1 in the text box, how many times must you click the button before the displayed value exceeds 500? How many times to exceed 1000?
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Solution Summary
This solution shows how to create a Javascript function to double a number. The solution shows how to integrate this function with an HTML file. See attachment for further details.
Solution Preview
The DoubleIt function is fairly straight-forward. The function needs to find the input field and then double the value in that field. The function is as follows:
function DoubleIt() {
var el = document.getElementById("numfield");
el.value *= 2;
}
The "getElementById" function call will find the input field named ...
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