Cannot display Array

Question

  var processResult = function(items)
{

    return  items;
};
    function queryDB(callback) {

            var sqlTxt = "SELECT * FROM DEMO";
            db.transaction(
                    function(tx) {
                        tx.executeSql(sqlTxt, [],
                                function(tx, results) {
                                    var item_Codes = [];
                                    for (var i = 0; i < results.rows.length; i++) {

                                        item_Codes.push({item_code: results.rows.item(i).itemCode});
                                    }
                                    callback(item_Codes);
                                })
                                , errorCB;
                    });
            return false;
        }

Main.js

  queryDB(processResult, function(arr) {
            $.each(arr, function(i, elem) {

        });
    });

In above Code item_Codes is array.Here i need to print the Array after the data is loaded.But when i try to print the array it displays null. How Can i print the Array after the data is loaded to the Array.

Can you eloborate your answer

user2889058
– user2889058

2013-11-14 05:04:38 +00:00
Commented Nov 14, 2013 at 5:04 — user2889058
– user2889058, Commented Nov 14, 2013 at 5:04

Guffa · Accepted Answer · 2013-11-14 05:03:28Z

1

You don't use the variable after the call, you use the parameter in the callback function that you send in the call:

queryDB(function(arr){
  console.log(arr);
});

answered Nov 14, 2013 at 5:03

Guffa

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3 Comments

Guffa Over a year ago

@user2889058: If you change your question to look like the answer, other people won't understand the answer.

user2889058 Over a year ago

Hwy sorry for the mistake.But when i try i still gives me error.11-14 11:23:28.718: E/Web Console(8418): Uncaught TypeError: undefined is not a function:67

Guffa Over a year ago

@user2889058: Now you have two callback functions in the call, but the function only uses the first. It seems that the variable processResult doesn't exist where you use it, did you create it inside a function scope?

aelor · Accepted Answer · 2013-11-14 05:09:24Z

0

why not you try :

function queryDB(callback) {



   var sqlTxt = "SELECT * FROM DEMO";
    db.transaction(
            function(tx) {
                tx.executeSql(sqlTxt, [],
                        function(tx, results) {
                            var item_Codes = [];
                            for (var i = 0; i < results.rows.length; i++) {

                                item_Codes.push({item_code: results.rows.item(i).itemCode});
                            }
                            callback(item_Codes);
                        })
                        , errorCB;
            });
    console.log(item_codes);
    return false;
}

That is, I am just trying to print out the value of your array after the code executes.

answered Nov 14, 2013 at 5:09

aelor

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1 Comment

user2889058 Over a year ago

Actually i need to print the array from another file.

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