qcubed/framework

<?php
require_once('../qcubed.inc.php');

class CalculatorForm extends QForm {

    // Our Calculator needs 2 Textboxes (one for each operand)
    // A listbox of operations to choose from
    // A button to execute the calculation
    // And a label to output the result
    protected $txtValue1;
    protected $txtValue2;
    protected $lstOperation;
    protected $btnCalculate;
    protected $lblResult;

    // Define all the QContrtol objects for our Calculator
    // Make our textboxes IntegerTextboxes and make them required
    protected function Form_Create() {
        $this->txtValue1 = new QIntegerTextBox($this);
        $this->txtValue1->Required = true;

        $this->txtValue2 = new QIntegerTextBox($this);
        $this->txtValue2->Required = true;

        $this->lstOperation = new QListBox($this);
        $this->lstOperation->AddItem('+', 'add');
        $this->lstOperation->AddItem('-', 'subtract');
        $this->lstOperation->AddItem('*', 'multiply');
        $this->lstOperation->AddItem('/', 'divide');

        $this->btnCalculate = new QButton($this);
        $this->btnCalculate->Text = 'Calculate';

        // This is the **ONLY LINE** that has been changed: from QServerAction to QAjaxAction
        $this->btnCalculate->AddAction(new QClickEvent(), new QAjaxAction('btnCalculate_Click'));

        // With btnCalculate being responsible for the action, we set this QButton's CausesValidation to true
        // so that validation will occur on the form when click the button.
        // But if you set it to false, you'll see that integers and null entries would instead be always allowed.
        $this->btnCalculate->CausesValidation = true;

        $this->lblResult = new QLabel($this);
        $this->lblResult->HtmlEntities = false;
    }

    protected function Form_Load() {
        // Let's always clear the Result label
        $this->lblResult->Text = '';
    }

    protected function Form_Validate() {
        // If we are Dividing and if the divisor is 0, then this is not valid
        if (($this->lstOperation->SelectedValue == 'divide') &&
                ($this->txtValue2->Text == 0)) {
            $this->txtValue2->Warning = 'Cannot Divide by Zero';
            return false;
        }

        // If we're here, then the custom Form validation rule validated properly
        return true;
    }

    // Perform the necessary operations on the operands, and output the value to the lblResult
    protected function btnCalculate_Click($strFormId, $strControlId, $strParameter) {
        switch ($this->lstOperation->SelectedValue) {
            case 'add':
                $mixResult = $this->txtValue1->Text + $this->txtValue2->Text;
                break;
            case 'subtract':
                $mixResult = $this->txtValue1->Text - $this->txtValue2->Text;
                break;
            case 'multiply':
                $mixResult = $this->txtValue1->Text * $this->txtValue2->Text;
                break;
            case 'divide':
                $mixResult = $this->txtValue1->Text / $this->txtValue2->Text;
                break;
            default:
                throw new Exception('Invalid Action');
        }

        if (isset($mixResult))
            $this->lblResult->Text = '<strong>Your Result:</strong> ' . $mixResult;
    }

}

// And now run our defined form
CalculatorForm::Run('CalculatorForm');
?>