Azure mobile services: basic read function in javascript

问题

I'm learning javascript and windowsazure mobile services. As a learning lesson I created a "users" table and inserted a test user. I'm actually using icenium to write a demo app for the ipad and andoid tablets, but I can't seem to figure out even the most basic request. So I've setup a jsfiddle here: http://jsfiddle.net/MNubd/5/.

It is a simple input box:

<input id="uFullName" type="text" />

and some javascript code. I'm trying to retrieve the "name" column from the table "users" and display it in the input box:

alert('running');
var client = new WindowsAzure.MobileServiceClient('https://mtdemo.azure-mobile.net/', 'MtxOqGpaBzuPRtnkIifqCKjVDocRPY47');
usersTable = client.getTable('users');
usersTable.where({ userID: 'impretty@blockedheaded.com' }).read({
    success: function (results) {
        $('#uFullName').val(results);
    },
    error: function (err) {
        $('#uFullName').val('there was and err');
    }
});

Thanks for your help!

EDIT: I had no idea the success function could only be used on server scripts. Thanks. Here is the code that ended up working for me:

function signInButton(e) {
    var un = $('#username');
    uName = un.val();
    var client = new WindowsAzure.MobileServiceClient('https://mtdemo.azure-mobile.net/', 'MtxOqGpaBzuPRtnkIifqCKjVDocRPY47');    
    //alert('lookup: ' + uName);
    usersTable = client.getTable('users');    
    usersTable.where({ userID: uName })
    .read()
    .done(
        function (results) {            
            try {
                xUserName = results[0].name; //using this to trigger an exception if the login credentials don't match.
                xUserID = results[0].id; // save this for querying and adding records for this user only.
                //alert('found');
                app.application.navigate('#view-menu');                        
            }
            catch(err) {
                 //alert('not found');
                 document.getElementById('errorText').textContent = "Check Email and Password!";                 
            }            
        } 
    );//end of the done

回答1:

The options object with the success and error callback objects is only used in server-side scripts. For the client side, the programming model is based on promises, and you should use the done() (or then()) continuation to get the results:

var client = new WindowsAzure.MobileServiceClient('https://mtdemo.azure-mobile.net/', 'YOUR-KEY');
var usersTable = client.getTable('users');
usersTable.where({ userID: 'impretty@blockheaded.com' }).read().done(function (result) {
    $("#uFullName").val(result.name);
}, function (err) {
    $("#uFullName").val('There was an error: ' + JSON.stringify(err));
});

来源：https://stackoverflow.com/questions/19392849/azure-mobile-services-basic-read-function-in-javascript

标签

javascript

azure-mobile-services