Develop Reference

GlideAjax request doesn't return any response

I'm newer in servicenow developing.
I try to create a bundle "Script Include" - "Client Script".
Using background script I see, that my script include works fine.
But when I try to call this include via client script, it doesn't return any response.
Here is my method in Script Include:
usersCounter: function () {
var gr = new GlideRecord('sys_user');
gr.query();
var users = gr.getRowCount();
gs.info('Number of users'+ ' ' + users);
return users;
And here is my client script:
var ga = new GlideAjax('SCI_Training_ScriptIncludeOnChange');
ga.addParam('sysparm_name', 'usersCounter');
ga.getXML(getUsers);
function getUsers(response) {
var numberOfUsers = response.responseXML.documentElement.getAttribute("answer");
g_form.clearValue('description');
console.log(numberOfUsers);
And I have null in my console.
What have I missed?

Irrespective of why it's not working, you probably want to change your server side GlideRecord to use GlideAggregate instead, and just let mysql return the row count:
var gr = new GlideAggregate('sys_user');
gr.addAggregate('COUNT');
gr.query();
gr.next();
var users = gr.getAggregate('COUNT');
gs.info('Number of users'+ ' ' + users);
return users;
Doing a GlideRecord#query with no where clause is essentially doing a "SELECT * FROM sys_user", bringing over all the data, when all you're asking for is the row count from the metadata in the result set.
Beyond that, make sure your Script Include properly extends AbstractAjaxProcessor and has the client-callable field set to true per this:
https://docs.servicenow.com/bundle/geneva-servicenow-platform/page/script/server_scripting/reference/r_ExamplesOfAsynchronousGlideAjax.html

You can try to debug your getUsers() method. Try to check what the object structure of response is.
You could also use
var ga = new GlideAjax('SCI_Training_ScriptIncludeOnChange');
ga.addParam('sysparm_name', 'usersCounter');
ga.getXMLAnswer(getUsers);
function getUsers(response) {
var numberOfUsers = response;
g_form.clearValue('description');
console.log(numberOfUsers);
}

MongoDB - Mongoose - TypeError: save is not a function

I am attempting to perform an update to a MongoDB document (using mongoose) by first using .findById to get the document, then updating the fields in that document with new values. I am still a bit new to this so I used a tutorial to figure out how to get it working, then I have been updating my code for my needs. Here is the tutorial: MEAN App Tutorial with Angular 4. The original code had a schema defined, but my requirement is for a generic MongoDB interface that will simply take whatever payload is sent to it and send it along to MongoDB. The original tutorial had something like this:
exports.updateTodo = async function(todo){
var id = todo.id
try{
//Find the old Todo Object by the Id
var oldTodo = await ToDo.findById(id);
}catch(e){
throw Error("Error occured while Finding the Todo")
}
// If no old Todo Object exists return false
if(!oldTodo){
return false;
}
console.log(oldTodo)
//Edit the Todo Object
oldTodo.title = todo.title
oldTodo.description = todo.description
oldTodo.status = todo.status
console.log(oldTodo)
try{
var savedTodo = await oldTodo.save()
return savedTodo;
}catch(e){
throw Error("And Error occured while updating the Todo");
}
}
However, since I don't want a schema and want to allow anything through, I don't want to assign static values to specific field names like, title, description, status, etc. So, I came up with this:
exports.updateData = async function(update){
var id = update.id
// Check the existence of the query parameters, If they don't exist then assign a default value
var dbName = update.dbName ? update.dbName : 'test'
var collection = update.collection ? update.collection : 'testing';
const Test = mongoose.model(dbName, TestSchema, collection);
try{
//Find the existing Test object by the Id
var existingData = await Test.findById(id);
}catch(e){
throw Error("Error occurred while finding the Test document - " + e)
}
// If no existing Test object exists return false
if(!existingData){
return false;
}
console.log("Existing document is " + existingData)
//Edit the Test object
existingData = JSON.parse(JSON.stringify(update))
//This was another way to overwrite existing field values, but
//performs a "shallow copy" so it's not desireable
//existingData = Object.assign({}, existingData, update)
//existingData.title = update.title
//existingData.description = update.description
//existingData.status = update.status
console.log("New data is " + existingData)
try{
var savedOutput = await existingData.save()
return savedOutput;
}catch(e){
throw Error("An error occurred while updating the Test document - " + e);
}
}
My original problem with this was that I had a lot of issues getting the new values to overwrite the old ones. Now that that's been solved, I am getting the error of "TypeError: existingData.save is not a function". I am thinking the data type changed or something, and now it is not being accepted. When I uncomment the static values that were in the old tutorial code, it works. This is further supported by my console logging before and after I join the objects, because the first one prints the actual data and the second one prints [object Object]. However, I can't seem to figure out what it's expecting. Any help would be greatly appreciated.
EDIT: I figured it out. Apparently Mongoose has its own data type of "Model" which gets changed if you do anything crazy to the underlying data by using things like JSON.stringify. I used Object.prototype.constructor to figure out the actual object type like so:
console.log("THIS IS BEFORE: " + existingData.constructor);
existingData = JSON.parse(JSON.stringify(update));
console.log("THIS IS AFTER: " + existingData.constructor);
And I got this:
THIS IS BEFORE: function model(doc, fields, skipId) {
model.hooks.execPreSync('createModel', doc);
if (!(this instanceof model)) {
return new model(doc, fields, skipId);
}
Model.call(this, doc, fields, skipId);
}
THIS IS AFTER: function Object() { [native code] }
Which showed me what was actually going on. I added this to fix it:
existingData = new Test(JSON.parse(JSON.stringify(update)));
On a related note, I should probably just use the native MongoDB driver at this point, but it's working, so I'll just put it on my to do list for now.

You've now found a solution but I would suggest using the MongoDB driver which would make your code look something along the lines of this and would make the origional issue disappear:
// MongoDB Settings
const MongoClient = require(`mongodb`).MongoClient;
const mongodb_uri = `mongodb+srv://${REPLACE_mongodb_username}:${REPLACE_mongodb_password}#url-here.gcp.mongodb.net/test`;
const db_name = `test`;
let db; // allows us to reuse the database connection once it is opened
// Open MongoDB Connection
const open_database_connection = async () => {
try {
client = await MongoClient.connect(mongodb_uri);
} catch (err) { throw new Error(err); }
db = client.db(db_name);
};
exports.updateData = async update => {
// open database connection if it isn't already open
try {
if (!db) await open_database_connection();
} catch (err) { throw new Error(err); }
// update document
let savedOutput;
try {
savedOutput = await db.collection(`testing`).updateOne( // .save() is being depreciated
{ // filter
_id: update.id // the '_id' might need to be 'id' depending on how you have set your collection up, usually it is '_id'
},
$set: { // I've assumed that you are overwriting the fields you are updating hence the '$set' operator
update // update here - this is assuming that the update object only contains fields that should be updated
}
// If you want to add a new document if the id isn't found add the below line
// ,{ upsert: true }
);
} catch (err) { throw new Error(`An error occurred while updating the Test document - ${err}`); }
if (savedOutput.matchedCount !== 1) return false; // if you add in '{ upsert: true }' above, then remove this line as it will create a new document
return savedOutput;
}
The collection testing would need to be created before this code but this is only a one-time thing and is very easy - if you are using MongoDB Atlas then you can use MongoDB Compass / go in your online admin to create the collection without a single line of code...
As far as I can see you should need to duplicate the update object. The above reduces the database calls from 2 to one and allows you to reuse the database connection, potentially anywhere else in the application which would help to speed things up. Also don't store your MongoDB credentials directly in the code.

Querying azure mobile services with javascript

I am working on a mobile application using apache cordova.. I have a javascript file that reads data from an azure mobile service and persists it onto the local SQLITE database..
i have a function that is meant to query the azure mobile service but it gives me an error -"cannot read propert 'take' of undefinedType". The function is as follows
function refreshQuestionsTable() {
alert("questions refreshing");
var query = QuestionsTable.take(100).read().done(function (results) {
alert(results.length); //see how many records were returned
for (var i = 0; i < results.length; i++) {
alert(results[i].question); //display the question returned
commitQuestions(results[i].question_id, results[i].client_ref, results[i].question_set, results[i].question_dept, results[i].question, results[i].question_branch, null);
}
},function (err) {
alert("Error: " + err);
});
}

It looks like your client instantiation piece is wrong.
var client = new MobileServiceClient('feedbackmaster.azure-mobile.net/', 'oLMEOExWGFolBhpyYpTFkqvKuLNlyL91');
You had a ';' at the end of your URL for some reason. You should also do a .where() clause that is universally true. Take should work off of that.

Azure mobile services: basic read function in javascript

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

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));
});

SQLITE DB not being created - PhoneGap

I have a Phonegap (2.1.0) application that onDeviceready creates a DB and populates a table with info.
Running this locally (using the Ripple emulator) on Chrome works. Tables are being created and populated as required.
After installing the build .apk on my Android device my Eclipse logcat shows:
sqlite returned: error code = 14, msg = cannot open file at line 27712 of [8609a15dfa], db=/data/data/<project>/databases/webview.db
sqlite returned: error code = 14, msg = os_unix.c: open() at line 27712 - "" errno=2 path=/CachedGeoposition.db, db=/data/data/<project>/databases/webview.db
Which I believe according to this post here - can be ignored.
However - I also noticed this error in logcat:
sqlite returned: error code = 1, msg = no such table: latest_events, db=/data/data/<project>/databases/webview.db
I have also - through adb shell - confirmed that the DB is not created:
here: /data/data/com.application/databases.
or here: /data/data/com.application/app_databases
So - my code:
if (!window.openDatabase) {
doMessage('Databases are not supported on this device. Sorry','error');
return;
}else{
consoleLog('all good for storage');
var db;
var shortName = 'MyDB';
var version = '1.0';
var displayName = 'MyDB';
var maxSize = 102400;
function errorHandler(transaction, error) {consoleLog('Error: ' + error.message + ' code: ' + error.code);}
function nullHandler(){};
db = window.openDatabase(shortName, version, displayName,maxSize);
consoleLog('starting table creation');
db.transaction(function(tx){
tx.executeSql( 'CREATE TABLE IF NOT EXISTS latest_events (id integer PRIMARY KEY AUTOINCREMENT,EventID integer,EventLocation text,EventName text,EventDateFrom varchar,EventTime timestamp,EventPresentedBy varchar,EventVenue varchar,EventScript text,RequireRSVP varchar)',[],nullHandler,errorHandler);
db.transaction(function(tx){
tx.executeSql('SELECT count(id) as RowCount FROM device_info ', [],
function(tx, result) {
if (result != null && result.rows != null) {
for (var i = 0; i < result.rows.length; i++) {
var row = result.rows.item(i);
consoleLog('rowcount: '+row.RowCount);
if(row.RowCount==0){
tx.executeSql('INSERT INTO device_info (device_name, device_platform, device_uuid, device_os_ver, date_last_used) VALUES (?,?,?,?,?)',[device.name, device.platform, device.uuid, device.version, window.bowman_config.siteDate],nullHandler,errorHandler);
//doMessage('device info row added','notice');
}
}
}
},errorHandler);
},errorHandler,successCallBack('2'));
//doMessage('device info row added','notice');
},errorHandler,successCallBack('1'));
}
To add to my woes - on my logcat I do see the console.log output for "all good for storage", and the "starting table creation" messages.
My errorHandler functions are not returning anything and my successCallBack functions are triggered...but no DB created.
Thanks for the help.

When you pass in successCallBack("2") and successCallBack("1") then you are actually invoking them directly so you may be getting false positives on whether or not success has actually been called. You should provide two separate success call backs or just in-line some functions that call console.log("1") for instance.

Today this issue cost me 3 hours. What I tried:
Rewriting the copy database code.
Deleting the app from the emulator / device
Wiping emulator(s)
Cleaning eclipse
Changing file permissions
Validate a working SQLite database file
I solved the problem by copying the code from a shared Dropbox account to another location and refactoring the code in the Android Manifest and java files with another package name.
The application runs beautifully now, i.e. nothing wrong with the code, but somewhere it's muxed up by Dropbox.

I broke the nested functions up into single functions and 'chained' them based on their success or fail. It's actually been a lot simpler than I thought. RTFM it seemed. Thanks for all the help.
simplified:
var db = window.openDatabase("TheApp", "1.0", "The App", 50000000);
db.transaction(queryDB, errorCB, successCB);
// Query the database //
function queryDB(tx) {
//tx.executeSql('SELECT * FROM table", [], querySuccess, errorCB);
}
function querySuccess(tx, results) {
//do more functions here
}
function errorCB(err) {
console.log("Error processing SQL: "+err.code);
}