Question

28

how can I pass argument in transaction callback function

rated 0 times [ 30] [ 2] / answers: 1 / hits: 17496 / 13 Years ago, sun, january 8, 2012, 12:00:00

From a tutorial code like this

function queryDB(tx) {

    tx.executeSql('SELECT * FROM DEMO', [], querySuccess, errorCB);

}



function querySuccess(tx, results) {



}



function errorCB(err) {

    alert(Error processing SQL: +err.code);

}



var db = window.openDatabase(Database, 1.0, PhoneGap Demo, 200000);

db.transaction(queryDB, errorCB);

in db.transaction i want to pass a variable as argument to queryDB function, so the code which i think of should looks like

db.transaction(queryDB(id), errorCB);

How I can actually implement this ? Or its simply gonna work like this and my id will be passed and get in tx ?

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danyelletyanah

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3 Years ago

answered 13 Years ago zackeryzainv · Accepted Answer

Wrap it in a function again

var id = 'THEID';

db.transaction(function(){

  queryDB(id)

}, errorCB);

Note - This is assuming that you're making the API. Some APIs / frameworks insert the required information automatically. For example

//the db.transaction method

function transaction(param, callback) {

   //do code stuff

   callback(someInternalId); //callback is the function you pass as the first parameter

}

So, if you want to pass your own data in the callback, wrap it in a function. Otherwise, the code you are using may be doing this for you automatically.