Ciao a tutti devo sommare il campo di una tabella e visualizzare il totale....non capisco dov'è il problema.
posto il codice:
posto il codice:
Codice:
function ensureTableExists(tx){
tx.executeSql('CREATE TABLE IF NOT EXISTS Bilancio (id INTEGER PRIMARY KEY, data, entrate, uscite, riposo)');
}
/** Called when browser load this page*/
function init(){
document.addEventListener("deviceready", onDeviceReady, false);
}
var dataBox = null;
var usciteBox = null;
var db = null;
var dataTable = null;
/** Called when phonegap javascript is loaded */
function onDeviceReady(){
var addButton = document.getElementById("add");
dataBox = document.getElementById("data");
usciteBox = document.getElementById("uscite");
dataTable = document.getElementById("data-table");
db = window.openDatabase("contactDB", "1.0", "Contact Database", 1000000);//name,version,display name, size
addButton.addEventListener(
"click",
function(){
db.transaction(
//function sql statements
function (tx){
ensureTableExists(tx);
var data = dataBox.value;
var uscite = usciteBox.value;
var sql = 'INSERT INTO Bilancio (data, uscite) VALUES ("'+data+'","'+uscite+'")';
tx.executeSql(sql);
},
//error callback
function (err){
alert("error callback "+err.code);
},
//success callback
function (err){
//alert("success callback "+err.code);
loadFromDB();
}
);
},
false);
loadFromDB();
}
function loadFromDB(){
db.transaction(
//function sql statements
function (tx){
ensureTableExists(tx);
tx.executeSql('SELECT SUM(entrate) FROM Bilancio',
[],
function(tx, results){
var htmlStr="";
for(var index=0;index<results.rows.length;index++){
var item = results.rows.item(index);
htmlStr=htmlStr+"<tr><td>"+item.data+"</td><td>€"+item.uscite+"</td><td><button onclick=\"deleteEntry('"+item.id+"');\">X</button></td></tr>";
}
dataTable.innerHTML=htmlStr;
}
,
function(err){
alert("Unable to fetch result from Bilancio Table");
}
);
},
//error callback
function (err){
alert("error callback "+err.code+" "+err.message);
},
//success callback
function (){
dataBox.value="";
usciteBox.value="";
}
);
}
function deleteEntry(id){
db.transaction(
//function sql statements
function (tx){
ensureTableExists(tx);
tx.executeSql('Delete FROM Bilancio where id='+id);
},
//error callback
function (err){
alert("error callback "+err.code+" "+err.message);
},
//success callback
function (err){
//alert("success callback ");
loadFromDB();
}
);
}
