JavaScript: Calculator Script - Best Price Calculator

Main Calculator Script Best Price Calculator

<!-- THREE STEPS TO INSTALL BEST PRICE:

1.  Copy this part of code inside your HTML HEAD

2.  The onLoad MUST be ADDED to the BODY tag

3.  Put the last coding into the BODY of your HTML document  -->

<HEAD><title>JavaScript, java script, javascripts, script, javascript free code!</title>

<!-- Begin

var max_units = 200; // quantities in excess of max_units all have the same unit price

var currency = "$"; // currency sign used in 'formatMessage()'

// Edit this function to reflect your discount prices!

function getDiscountPrice(units) {

// Note: It is important to work your way down from max to min amounts!

if (units >= max_units) return 4;

if (units >= 100) return 6;

if (units >= 50) return 8;

if (units >= 25) return 10;

if (units >= 10) return 13;

if (units >= 5) return 16;

if (units >= 2) return 17.50;

if (units == 1) return 19.95;

if (units <= 0) return 0;

}

function getNumberOfUnits() {

var units = document.calculator.units.value;

return (units == "") ? 0 : units;

}

function showResult(result) {

// adjust the following line if result must popup somewhere else

document.calculator.respons.value = result;

}

function formatMessage(units, unit_price) {

return units + " * " + currency + formatPrice(unit_price) + " = " + currency + formatPrice(units * unit_price);

}

// AltUnits (alternate units): add extra units to reach minimum for next discount price

function getAltUnits(units) {

var discount_price = getDiscountPrice(units);

if (units < max_units) do { units++ } while (discount_price == getDiscountPrice(units));

return units;

}

function findPrice() {

var units = getNumberOfUnits();

var unit_price = getDiscountPrice(units);

var alt_units = getAltUnits(units);

var alt_unit_price = getDiscountPrice(alt_units);

var result;

if ((units * unit_price) < (alt_units * alt_unit_price))

result = formatMessage(units, unit_price);

else

result = formatMessage(alt_units, alt_unit_price);

showResult(result);

}

function formatPrice(value) {

var result= Math.floor(value) + ".";

var cents = 100 * (value-Math.floor(value)) + 0.5;

result += Math.floor(cents / 10);

result += Math.floor(cents % 10);

return result;

}

function filterNonNumeric(field) {

var result = new String();

var numbers = "0123456789";

var chars = field.value.split(""); // create array

for (i = 0; i < chars.length; i++) {

if (numbers.indexOf(chars[i]) != -1) result += chars[i];

}

if (field.value != result) field.value = result;

}

//  End -->

</script>

</HEAD>

<tr>

<td>Single unit license</td>

</tr>

<tr>

<td>License for 2 to 4 units</td>

</tr>

<tr>

<td>License for 5 to 9 units</td>

</tr>

<tr>

<td>License for 10 to 24 units</td>

</tr>

<tr>

<td>License for 25 to 49 units</td>

</tr>

<tr>

<td>License for 50 to 99 units</td>

</tr>

<tr>

<td>License for 100 to 199 units</td>

</tr>

<tr>

<td>License for 200 or more units</td>

</tr>

</table>

<br>

Units:

</form>

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