CODEWITHSUNDEEP
javascript
epsilon
epsilon

Reputation: 11

Javascript function with 2 arguments

I need to create a function with 2 arguments (price1, price2), which should be added together and the result would be displayed in a text field after adding Vat to them.

Overall, I need to have 3 text fields: price1, price2 and results. In addition, the results field should be calculated after pushing the button calculate.

So far, I've come up with a return function with document.write, but it obviously doesn't display any text fields, which looks like that:

function getTotalPrice(price1,price2,Vat)
{
  var sum=price1+priceb;
  var Vat=20;
  return ((sum*Vat)*100)/100;
}
document.write(getTotalPrice(4,3));

I have no clue how to create the button that could calculate Vat and display it in the third text box.

Upvotes: 1

Views: 25211

Answers (3)

brymck
brymck

Reputation: 7663

Issues:

  1. Vat is unused as an argument, and even if it were used it would always be reinitialized in your code and assigned a value of 20.
  2. priceb was a typo.

Beyond that the code doesn't seem to have any evident problems.

function getTotalPrice(price1, price2, vat) {
  vat = (vat === undefined? 20 : vat); // give vat a default value if empty
  return (price1 + price2) * vat;
}

document.write(getTotalPrice(4, 3));

Edit: Per the comment below, which is true, I figured I should just go ahead and simplify the math here. If the asker has a different equation in mind he should probably explain a bit more.

Edit: (vat === undefined? 20 : vat) is correct, producing any value other than undefined, default 20. (vat === undefined? vat : 20) will only produce undefined or 20.

Upvotes: 1

PAG
PAG

Reputation: 1946

Buttons are created with the input tag. An example that does what you want:

<input type="text" id="price1">
<input type="text" id="price2">
<input type="text" id="results">
<input type="button" value="Calculate" onclick="calculateResults()">

<script type="text/javascript">
function calculateResults() {
    var price1Box = document.getElementById('price1');
    var price2Box = document.getElementById('price2');
    var resultsBox = document.getElementById('results');
    resultsBox.value = getTotalPrice(price1Box.value, price2Box.value);
}
</script>

There are cleaner ways to do this, but this is the most practical and simplest. You'll need the fixes posted by Bryan if you want getTotalPrice to work.

Upvotes: 3

Ant
Ant

Reputation: 3887

This should do what you're after:

<script type="text/javascript">
  function getTotalPrice(price1,price2)
  {
    var vat = 20;
    return (((price1+price2) * vat) * 100) / 100;
  }

  function calculate()
  {
    var result = document.getElementById('result');
    result.value = getTotalPrice(document.getElementById('price1').value, document.getElementById('price2').value);
  }
</script>

<form>
  <input type="text" id="price1" />
  <input type="text" id="price2" />
  <input type="text" id="result" />
  <input type="button" value="Calculate" onclick="calculate()" />
</form>

Upvotes: 0

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