How can I create a javascript function to put in Cloud Code of parse.com, which downloads the content of the class in a json file?
I've read through the Cloud Code Documentation at parse.com https://www.parse.com/docs/cloud_code_guide but I haven't found any examples similar to what I need to do.
You can use this for example (there a few ways). Remove // to limit the number of objects (2 or whatever). "english" being my class.
Then you need to read this function from your platform (mobile desktop etc) which you also need to know how to do. What platform do you use? I only know Corona SDK.
Parse.Cloud.define("getall", function(request, response) {
var query = new Parse.Query("english");
//query.limit(2)
query.find({
success: function(results) {
response.success(results);
},
Related
In the older version of javascript I was using managedupload function for uploading big files to s3, which will do the queueing and manage multiparting of files. But in V3 this function is not anywhere in documentation, is that removed? or is there any alternatives? Please help...
In V3 the high level abstractions are moved to functionality specific lib packages while the client packages offer a one to one mapping of the low level public apis.
For S3 the client is in #aws-sdk/client-s3 and the high level operations are in #aws-sdk/lib-storage packages respectively.
Sample upload code for a managed upload would look like the following
const { S3Client } = require("#aws-sdk/client-s3");
const { Upload } = require("#aws-sdk/lib-storage");
const multipartUpload = new Upload({
client: new S3Client({}),
params: {Bucket: 'bucket', Key: 'key', Body: stream},
});
More information here.
In the docs it states that Services only emit events when a Service method modifies data. This is the case in all examples I have seen, where a client modifies that data from the browser itself and it gets automatically updated in other clients (like a chat webapp). But what if my data is modified externally outside of Feathers? Will I be able to use Feathers so that the data is updated in all clients?
In my specific case my data is actually stored in a MongoDB database which gets updated externally and autonomously. I want my web application to use MongoDB Change Streams to listen to changes on the MongoDB database (I already know how to do this) and then I want Feathers to take care of sending updates to all my clients in real-time.
In the example chat app, this would be equivalent to having a bot that also writes messages directly to the database outside of Feathers, and this messages should also be broadcasted to clients in real-time.
Is my use-case a good fit for Feathers? Any hint on how should I approach it?
Watching changefeeds has been done for feathers-rethinkdb here. Something similar could be done for MongoDB but there are several challenges discussed in this issue.
If your MongoDB collection only gets updated externally you could also create a simple pass through service like this:
app.use('/feed/messages', {
async create(data) {
return data;
},
async remove(id) {
return { id };
},
async update(id, data) {
return data;
},
async patch(id, data) {
return data;
}
});
Which is then called by the changefeed watcher and will automatically take care of updating all the clients through its events.
I want to add a like button, for every post on the homepage of my jekyll blog
I didn't find any plugin. I don't want any facebook's like button that connects to company's/product page likes.
I want a like button which is independent from any social platforms and only relates to post.
Something like this
Short answer: you can't.
Long answer: your button will have store the "likes" somewhere (usually a database), which is by definition a dynamic process. Jekyll can only generates static data.
You can bind your button to an external service, e.g. LikeBtn which provides such functionality (the free offer miss advanced features like statistics).
Whatever the service you choose, it will usually work by adding a javascript snippet, as with google analytics. You can see how to use google analytics with jekyll to help you (e.g. here).
Yes it is possible to add a like button and track number of likes by writing your custom JavaScript code and a database to your Jekyll generated static sites.
So coming to the database as it is a static page and doesn't involve any server, it is not possible to interact with database directly but there is a way.
In my case I am making use of firebase. Firebase by Google provides us many capabilities like storage, database , hosting and also access to serverless architecture using functions.
So coming to the point, all you need to do is register with http://firebase.google.com
Then create an app and then in your JavaScript add following code in head tag
<script src="https://www.gstatic.com/firebasejs/5.9.0/firebase.js"></script>
<script>
// Initialize Firebase
// TODO: Replace with your project's customized code snippet
var config = {
apiKey: "<API_KEY>",
authDomain: "<PROJECT_ID>.firebaseapp.com",
databaseURL: "https://<DATABASE_NAME>.firebaseio.com",
projectId: "<PROJECT_ID>",
storageBucket: "<BUCKET>.appspot.com",
messagingSenderId: "<SENDER_ID>",
};
firebase.initializeApp(config);
var timestamp = new Date().valueOf();
var obj = {};
obj[timestamp] = "1";
firebase.database().ref('/').update(obj)
</script>
For more details,
You can visit my blog on this topic
https://xyzcoder.github.io/firebase/2019/03/17/firebase-real-time-database.html
Note: we can also implement security restrictions on who can read and write data to our json store
Thanks,
Pavan
I am trying to read a JSON file with Meteor. I've seen various answers on stackoverflow but cannot seem to get them to work. I have tried this one which basically says:
Create a file called private/test.json with the following contents:
[{"id":1,"text":"foo"},{"id":2,"text":"bar"}]
Read the file contents when the server starts (server/start.js):
Meteor.startup(function() {
console.log(JSON.parse(Assets.getText('test.json')));
});
However this seemingly very simple example does not log anything to the console. If I trye to store it in a variable instead on console.logging it and then displaying it client side I get
Uncaught ReferenceError: myjson is not defined
where myjson was the variable I stored it in. I have tried reading the JSON client side
Template.hello.events({
'click input': function () {
myjson = JSON.parse(Assets.getText("myfile.json"));
console.log("myjson")
});
}
Which results in:
Uncaught ReferenceError: Assets is not defined
If have tried all of the options described here: Importing a JSON file in Meteor with more or less the same outcome.
Hope someone can help me out
As per the docs, Assets.getText is only available on the server as it's designed to read data in the private directory, to which clients should not have access (thus the name).
If you want to deliver this information to the client, you have two options:
Use Assets.getText exactly as you have done, but inside a method on the server, and call this method from the client to return the results. This seems like the best option to me as you're rationing access to your data via the method, rather than making it completely public.
Put it in the public folder instead and use something like jQuery.getJSON() to read it. This isn't something I've ever done, so I can't provide any further advice, but it looks pretty straightforward.
The server method is OK, just remove the extra semi-colon(;). You need a little more in the client call. The JSON data comes from the callback.
Use this in your click event:
if (typeof console !== 'undefined'){
console.log("You're calling readit");
Meteor.call('readit',function(err,response){
console.log(response);
});
}
Meteor!
I want to build a PhoneGap HTML5 app with a StackMob backend. There seems to be a shortage of books, videos, and tutorials on the topic.
Specifically, how can I build a Phonegap + StackMob app without using Require.js and Backbone.js?
I think stackmob developer website: https://developer.stackmob.com/ is the best resource.
Using phoneGap with StackMob is independent of using Backbone.js and Require.js. The StackMob SDK is built using Backbone.js for managing models and collections.
So, if you want to build an app without Backbone.js, you can make bare AJAX calls to StackMob. Here is a JSFiddle showing how.
http://jsfiddle.net/ericktai/mr925/
/*
We want to prepare the Request headers we're going to send to StackMob. It should look like:
{
'Accept': application/vnd.stackmob+json; version=0',
'X-StackMob-API-Key-dc0e228a-ccd3-4799-acd5-819f6c074ace': 1,
'Range': 'objects=0-9' //this is optional, but I did it here to show pagination and extra header fields
}
You can actually have the public key in the header as:
'X-StackMob-API-Key': dc0e228a-ccd3-4799-acd5-819f6c074ace
OR
'X-StackMob-API-Key-dc0e228a-ccd3-4799-acd5-819f6c074ace': 1
The first is our original format. The reason why I chose the latter is because of this specific example. I'm making cross domain requests jsfiddle.net to api.stackmob.com, which the browser doesn't allow UNLESS we use CORS (cross origin resource sharing). StackMob servers support CORS, but it needs the latter header format to do so. (it was introduced later). iOS and Android SDKs use the first format.
Node.js should be able to use the first format because it doesn't restrict cross domain calls.
The "1" value in the latter format is arbitrary. IE just doesn't allow the value of a header to be empty, so we filled it with "1".
*/
var publicKeyHeader = 'X-StackMob-API-Key-dc0e228a-ccd3-4799-acd5-819f6c074ace';
var requestHeaders = {};
requestHeaders['Accept'] = 'application/vnd.stackmob+json; version=0';
requestHeaders[publicKeyHeader] = 1;
requestHeaders['Range'] = 'objects=0-9'; //set pagination to first 10
$.ajax({
url: 'https://api.stackmob.com/item',
headers: requestHeaders, //set the headers
type: 'GET',
success: function(data, textStatus, xhr) {
console.debug(data);
},
error: function(xhr, textStatus, error) {
console.debug(error);
}
});
Regarding phoneGap, you'll want to look at the following docs.
https://developer.stackmob.com/js-sdk/using-the-js-sdk-with-phonegap-guide
I've used Adobe phoneGap build successfully.
Btw- I am the Platform Evangelist at StackMob