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Session methods
The following methods can be used to handle session variables.
Signature |
Description |
IsSessionVariableSet($name) |
Checks if the given variable exists in the session. |
GetSessionVariable($name) |
Returns the value of the given session variable. |
SetSessionVariable($name, $value) |
Sets a value to a session variable. |
UnSetSessionVariable($name) |
Removes the given variable from the session. |
The code in the examples below is used in the OnPreparePage event handler:
Example 1:
The following code is used to filter countries by life expectancy:
// default values
$minLifeExpectancy = 40;
$maxLifeExpectancy = 90;
// checking values in the browser address line
if (GetApplication()->isGetValueSet('minLifeExpectancy') &&
GetApplication()->isGetValueSet('maxLifeExpectancy')) {
$minLifeExpectancy = GetApplication()->GetGETValue('minLifeExpectancy');
$maxLifeExpectancy = GetApplication()->GetGETValue('maxLifeExpectancy');
} // or (if not found) in the session
elseif (GetApplication()->IsSessionVariableSet('minLifeExpectancy') &&
GetApplication()->IsSessionVariableSet('maxLifeExpectancy')) {
$minLifeExpectancy = GetApplication()->GetSessionVariable('minLifeExpectancy');
$maxLifeExpectancy = GetApplication()->GetSessionVariable('maxLifeExpectancy');
}
// applying filter to the dataset
$this->dataset->AddCustomCondition(
"life_expectancy >= {$minLifeExpectancy} ".
"AND life_expectancy <= {$maxLifeExpectancy}");
// saving calculated values to the session
GetApplication()->SetSessionVariable('minLifeExpectancy', $minLifeExpectancy);
GetApplication()->SetSessionVariable('maxLifeExpectancy', $maxLifeExpectancy);
Example 2:
The code below removes the 'minLifeExpectancy' and 'maxLifeExpectancy' variables from the session if the 'resetLifeExpectancyFilter' variable is specified in $_GET.
if (GetApplication()->IsGetValueSet('resetLifeExpectancyFilter')) {
GetApplication()->UnSetSessionVariable('minLifeExpectancy');
GetApplication()->UnSetSessionVariable('maxLifeExpectancy');
}
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