Question

I defined the following Javascript function:

function RecoverDataFromTable(table_name) {
              query = "";

              //some code that build a query string from table_name and
              //other arguments given to the function

              function Query(database) {
              database.executeSql(query, [], RecoverResults, Error)
              }

              function RecoverResults(database, results) {
              var my_result = results.rows(0).id;
              // assume this works and store a value to my_result
              }

              function Error(error) {
              //alert something
              }

              function Success() {
              //alert something
              }

              database.transaction(Query, Error, Success)                 

              }

Now, how can i return my_result value so i can do this?

var my_var = RecoverDataFromTable(table_name, argument1, argument2.....)

Thanks in advance.
Ask if you need more explanation. 🙂

http://www.raymondcamden.com/index.cfm/2012/1/6/Working-with-dates-and-SQLite-in-PhoneGap

Answer 1

You can’t really set the variable like that, because the function is asynchronous. Instead, you should include a callback function in your request to RecoverDataFromTable. Define it like this:

function RecoverDataFromTable(callback, table_name) {
     ...

     function RecoverResults(database, results) {
          var my_result = results.rows(0).id;
          // assume this works and store a value to my_result
          // make the callback:
          callback(result);
     }
     ...
}

Then make the call like this:

function handleResult(my_result)
{
    // handle the result here
}

RecoverDataFromTable(handleResult, table_name, argument1, argument2.....);