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Write a function that returns the total cost of any number of buckets of paint. Ask...

Write a function that returns the total cost of any number of buckets of paint. Ask the user how many buckets he or she is going to buy and for the cost of one bucket. Ask the user the color of the paint. Calculate and return what he or she owes. Change the color of the font to the color of the paint.
Use .innerHTML to display your output.

Extra Credit
1. Use the catch/try/throw statements to check for invalid input if the user doesn’t give you a valid value for the number of buckets, such as a number less than 0, or gives you no input, or types in a string, and so on. <br />
2. Check that the user doesn’t give you a color of paint that is the same color as the background of your document or you will not be able to see the color of the font.

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Answer #1

Please find the JS program for the above scenario

<!DOCTYPE html>
<html>
<head>
<title>Cost of Paint Buckets</title>
<script type="text/javascript">
function paintBucket() {
var message;
var n = document.getElementById("t1").value;
var c = document.getElementById("t2").value;
var red = document.getElementById("t3").value;
message = document.getElementById("result");
message.innerHTML = "";
try{
if(n > 0) document.getElementById("result").innerHTML = "<br><br>The Cost of the buckets is " + n * c;
if(n < 0) throw "less than 0.";
if(n == " ") throw "Empty.";
if(typeof n == "string") throw "a String.";
}
catch(err) {
message.innerHTML = "<br><br>Bucket number is " + err;
}
}
</script>
</head>
<body>
<input id="t1" placeholder="Enter number of buckets"><br>
<input id="t2" placeholder="Enter cost of one bucket"><br>
<input id="t3" placeholder="Enter color of paint"><br><br>
<input type="button" onClick="paintBucket()" Value="Click me" />
<span id = "result"></span>
</body>
</html>

Explanation: By using three text fields, we take the user input. Using the function paintBucket(), input values are evaluated to find the cost. Here, exception handling is done using try,catch to handle input value of number of buckets for less than 0, empty or string. The output is printed respectively.

To add the color property to the code, the 'fontcolor()' function can be explored and implemented.

Hope this helps.

Please write back in case of more queries.

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