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W3.JS Controllers


What is a Controller?

A controller is a function you write to control your data.

With a self-written controller, you can modify data anyway you want:

  • Convert to upper case
  • Convert currencies
  • Calculate and Summarize
  • Round values
  • Substitute values
  • Change colors according to values
  • Anything else you are able to program

Controller Example 1

You want to convert your data to upper case before display.

Convert to Upper Case

<script>
w3.getHttpObject("customers.js", myFunction);

function myFunction(myObject) {
  var i;
  var myArray = myObject.customers;
  for (i = 0; i < myArray.length; i++) {
    myArray[i]["CustomerName"] =
    myArray[i]["CustomerName"].toUpperCase();
  }
  w3.displayObject("id01", myObject);
}
</script>
Try It Yourself » With CSS »

Controller Example 2

Summarize Price

<script>
w3.getHttpObject("cd_catalog.js", myFunction);

function myFunction(myObject) {
  var i, total = 0;
  var myArray = myObject.cd;
  for (i = 0; i < myArray.length; i++) {
    total += Number(myArray[i].price);
  }
  myObject.total = total.toFixed(2);
  w3.displayObject("id01", myObject);
}
</script>
Try It Yourself » With CSS »