如何在phoneGap api中使javascript变量全局变量

时间:2013-09-21 11:56:11

标签: javascript jquery jquery-mobile cordova

我现在正在学习如何使用phonegap并且学习进展顺利但我在phoneGap Api中遇到了全局变量。实际上我首先从xml文件中获取结果,然后将数据插入到数据库中。我已经完成了这项工作,但现在我想得到插入行的最后一个id,然后插入另一个表,因为在xml中有子节点。

function populateDB(tx) {
        tx.executeSql('DROP TABLE IF EXISTS fruit');
        tx.executeSql('DROP TABLE IF EXISTS fruit_benefit');
        tx.executeSql('CREATE TABLE IF NOT EXISTS fruit (id INTEGER NOT NULL PRIMARY KEY, fname,fsname,fruit_icon,fruit_image)');
        tx.executeSql('CREATE TABLE IF NOT EXISTS fruit_benefit (id INTEGER NOT NULL PRIMARY KEY, benefit, fruit_id)');
        $.ajax({
        type: "GET",
        url: "data.xml",
        dataType: "xml",
        success: function(xml) {
            $(xml).find('fruit').each(function(){
                var fname = $(this).find('fname').text();
                var fsname = $(this).find('fsname').text();
                var fruit_icon = $(this).find('fruit_icon').text();
                var fruit_image = $(this).find('fruit_image').text();
                //$('<div class="items" id="link_'+fname+'"></div>').html('<a href="'+fsname+'">'+fname+'</a>').appendTo('#lbUsers');
                db.transaction(function(transaction) { 
                    transaction.executeSql('INSERT INTO fruit (fname,fsname,fruit_icon,fruit_image) VALUES (?,?,?,?)',[fname, fsname, fruit_icon, fruit_image],function(transaction, results){
               var lastId = results.insertId; 
            },nullHandler,errorHandler);
              });

              alert(lastId);

            });
        }
    });

}

var lastId = results.insertId; //The last inserted id is shown here.

alert(lastId); //I want to show last inserted id here

我做了什么。

javascript全局变量,localstorage但两者都无效..

1 个答案:

答案 0 :(得分:0)

你甚至不需要它是全球性的。在函数中但在foreach之前定义lastId。如果这不起作用,那么通过移动var lastId,使其成为全局应该真的有效;函数populateDB()

之前的行
function populateDB(tx) {
        tx.executeSql('DROP TABLE IF EXISTS fruit');
        tx.executeSql('DROP TABLE IF EXISTS fruit_benefit');
        tx.executeSql('CREATE TABLE IF NOT EXISTS fruit (id INTEGER NOT NULL PRIMARY KEY, fname,fsname,fruit_icon,fruit_image)');
        tx.executeSql('CREATE TABLE IF NOT EXISTS fruit_benefit (id INTEGER NOT NULL PRIMARY KEY, benefit, fruit_id)');
        $.ajax({
        type: "GET",
        url: "data.xml",
        dataType: "xml",
        success: function(xml) {

            var lastId;

            $(xml).find('fruit').each(function(){
                var fname = $(this).find('fname').text();
                var fsname = $(this).find('fsname').text();
                var fruit_icon = $(this).find('fruit_icon').text();
                var fruit_image = $(this).find('fruit_image').text();
                //$('<div class="items" id="link_'+fname+'"></div>').html('<a href="'+fsname+'">'+fname+'</a>').appendTo('#lbUsers');
                db.transaction(function(transaction) { 
                    transaction.executeSql('INSERT INTO fruit (fname,fsname,fruit_icon,fruit_image) VALUES (?,?,?,?)',[fname, fsname, fruit_icon, fruit_image],function(transaction, results){
               lastId = results.insertId; 
            },nullHandler,errorHandler);
              });

              alert(lastId);

            });
        }
    });

}