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Sometimes during editing and/or inserting records we need to retrieve an additional information from the server side (for example, the value from a session, the value of a GET parameter or data from the database). To obtain such an information, the Ajax technique can be used.
The example below shows how to retrieve such information from the database. When a product is selected in the Insert form, the value of the Unit price editor is filled automatically based on the selected product.
To implement such a functionality, it is necessary to specify the following event handlers (click a name of a handler to see its code):
Open the Insert form for Invoice details to see this feature in action.
// OnInsertFormEditorValueChanged event body
if (sender.getFieldName() == 'product_id') {
var productIdValue = sender.getValue();
$.getJSON(
location.href,
{
productId: productIdValue
},
function (data) {
editors['unit_price'].setValue(data.price);
}
)
} protected function DoPrepare() {
if (GetApplication()->isGetValueSet('productId')) {
$productId = GetApplication()->GetGETValue('productId');
$sql = "SELECT price FROM product WHERE id = $productId";
$queryResult = $this->GetConnection()->fetchAll($sql);
$result = array(
'price' => $queryResult[0]['price']
);
echo json_encode($result);
exit;
}
}
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This demo application contains 100+ pages and illustrates most of features provided by PHP Generator. Hope it will help you to create even more powerful websites for your users.
You can download the demo project from our website and run the demo on your webserver as described in readme.txt.