Javascript html5 database transaction problem in loops
- by Marek
I'm hittig my head on this and i will be glad for any help. I need to store in a database a context (a list of string ids) for another page. I open a page with a list of artworks and this page save into the database those artowrks ids. When i click on an artwork i open its webpage but i can access the database to know the context and refer to the next and prev artwork.
This is my code to retrieve the contex:
updateContext = function () {
alert("updating context");
try {
mydb.transaction(
function(transaction) {
transaction.executeSql("select artworks.number from artworks, collections where collections.id = artworks.section_id and collections.short_name in ('cro', 'cra', 'crp', 'crm');", [], contextDataHandler, errorHandler);
});
} catch(e) {
alert(e.message);
}
}
the contextDatahandler function then iterates through the results and fill again the current_context table:
contextDataHandler = function(transaction, results) {
try {
mydb.transaction(
function(transaction) {
transaction.executeSql("drop table current_context;", [], nullDataHandler, errorHandler);
transaction.executeSql("create table current_context(id String);", [], nullDataHandler, errorHandler);
}
)
}
catch(e) {
alert(e.message);
}
var s = "";
for (var i=0; i < results.rows.length; i++) {
var item = results.rows.item(0);
s += item['number'] + " ";
mydb.transaction(
function(tx) {
tx.executeSql("insert into current_context(id) values (?);", [item['number']]);
}
)
}
alert(s);
}
the result is, i get the current_context table deleted, recreated, and filled, but all the rows are filled with the LAST artwork id. the query to retrieve the artworks ids works, so i think it's a transaction problem, but i cant figure out where.
thanks for any help
