exists
[ Function ]
public exists(
callback?: (data: Symbol.IExistsResultObject) => void
): any;
Checks if the symbol exists.
Parameter
Name | Type | Description |
---|---|---|
callback [ optional ] | (data: Symbol.IExistsResultObject) => void | This is triggered when the action has been successfully completed or an error has occurred. For details, please refer to the parameter data. |
Return value
Type | Description |
---|---|
void | No return value |
Available from version 1.10.1336.10 |
Sample - JavaScript
var symbol = new TcHmi.Symbol('%s%PLC1.MAIN.sTest%/s%');
symbol.exists(function (data) {
if (data.error === TcHmi.Errors.NONE) {
// Handle result value...
var symExists = data.result;
console.log('Symbol exists: '+ symExists);
} else {
// Handle error...
}
});