In a Template helper, is it possible to get from a method a value returned by another method?
In example
Template.postsList.helpers({
posts: function () {
return Posts.find({});
},
nextPath: function () {
// how to return here the number of posts from the query
// in the posts method?
}
});
You can just refactor the code so you have a shared way to obtain the posts cursor:
var postsCursor = function() {
return Posts.find();
};
Template.postsList.helpers
posts: postsCursor,
nextPath: function () {
var count = postsCursor().count();
// do something with count
}
});
Related
This below is my collection code
Competitions = new Mongo.Collection("competitions");
var CompetitionsSchema = new SimpleSchema({
year: {
type: String
},
division: {
type : String,
allowedValues: ['Elite', '1st','2nd','3rd','4th','Intro']
},
teams:{
type : [TeamSchema],
allowedValues: (function () {
return Teams.find().fetch().map(function (doc) {
return doc.name;
});
}()) //here we wrap the function as expression and invoke it
}
});
In the allowedValues function
Teams.find is empty.
In the router I am subscribing to the publication as follows
this.route('competitions', {
path: '/admin/competitions',
layoutTemplate: 'adminLayout',
waitOn: function () {
return [
Meteor.subscribe('teams')
];
}
});
This is my publish function
Meteor.publish('teams', function() {
return Teams.find({},{sort: {
points: -1,
netRunRate : -1
}});
});
Do I have to do subscription some where else as well?
Your problem is in this piece of code:
allowedValues: (function () {
return Teams.find().fetch().map(function (doc) {
return doc.name;
});
}()) //here we wrap the function as expression and invoke it
This gets called when the page loads. At that point the Teams collection will still be empty on the client side. You need to wait until the data is ready. Since you are using waitOn in iron-router, it might be enough to just move this code to the onRendered callback.
This is weird but when I call a external function from Meteor.method function it will always return undefined in the client I tried Meteor.wrapAsync but I think I'm doing something wrong. Here is my code:
var demoFunction = function () {
//database operations
var user = this.userId;
if (!user)
return;
var count = Users.aggregate([
{ $group: {_id: null, count: {$sum: 1}} }
]);
if (count[0] && count[0].count)
return count[0].count;
return 0;
}
Meteor.methods({
// NOT WORKING, How can I make this work?
methodDemo: function () {
var result = demoFunction ();
return result;
},
// Works
methodDemo2: function () {
//database operations
var user = this.userId;
if (!user)
return;
var count = Users.aggregate([
{ $group: {_id: null, count: {$sum: 1}} }
]);
if (count[0] && count[0].count)
return count[0].count;
return 0;
}
});
// Call from client
Meteor.call("methodDemo", function (err, res) { });
calling external functions doesn't work the same way if I put the code inside the meteor method why?
Try using Meteor.userId() in your function instead of this.userId. I think you are loosing the value of this when calling your function causing it to exit early.
Since you declared the function with a var it is scoped outside of methodDemo().
You could declare the function globally by removing var or move the demoFunction() code into methodDemo().
I'm building a meteor app and on one route I'm adding multiple data context like so -
this.route('orgPage', {
path: '/org/:title',
data: {
orgs: function () {Orgs.findOne(this.params._id)},
projects: function() {Meteor.subscribe('projects', this.params._id)}
}
The only problem is that when I try to access this data in my templates js file, I can't access the _id or any of the attributes of orgs.
I've tried several approaches, but it always returns undefined. If I use a single data context, it works perfectly. Here is the function that doesn't function properly -
Template.orgPage.events({
'click #newProject': function(e) {
$('#npModal').modal();
},
'submit #npModal form': function(e, template) {
e.preventDefault();
if(!$(e.target).find('[name=newTitle]').val()) {
var projectTitle = 'Untitled'
} else {
var projectTitle = $(e.target).find('[name=newTitle]').val()
}
var theid = this._id;
var newProject = {
title: projectTitle,
organization: theid
}
Meteor.call('project', newProject, function(error, id) {
if (error)
return alert(error.reason);
$('#npModal').modal('hide');
$('#npModal').on('hidden.bs.modal', function (e) {
Router.go('newFields', {});
})
});
});
Anyone have any ideas? Thanks!!
You have missed a return statement. function () {Orgs.findOne(this.params._id)} should be function () {return Orgs.findOne(this.params._id)}. Further more, this inside this function won't refer to what you want, so you can't use this.params. And why do you subscribe to a subscription as a data context property? Do it in the waitOn function instead.
I have this piece of code using on() to get data from Firebase, inside on() I create object which I want to send out of function for future use - using return, but it seems it doesn't return anything.
So question is how can I make it right?
postsRef.on('value', function(snapshot) {
if (snapshot.val() === null) {
var allPosts = false,
numberOfPosts = 0;
}
else {
var allPosts = snapshot.val(),
numberOfPosts = Object.size(allPosts);
}
var postsData = {
content: allPosts,
count: numberOfPosts
};
return postsData;
});
The callback function is called asynchronously (some time in the future). So by the time it is invoked, postsRef.on(...) has already returned and any code immediately after it will have run.
For example, this might be tempting, but would not work:
var postsData;
postsRef.on('value', function(snapshot) {
postsData = snapshot.val();
});
console.log(postsData); // postsData hasn't been set yet!
So there are a few different ways to tackle this. The best answer will depend on preference and code structure:
Move the logic accessing postsData into the callback
postsRef.on('value', function(snapshot) {
postsData = snapshot.val();
console.log(postsData);
});
Call another function when the callback is invoked
function logResults(postsData) {
console.log(postsData);
}
postsRef.on('value', function(snapshot) {
logResults(snapshot.val());
});
Trigger an event
function Observable() {
this.listeners = [];
}
Observable.prototype = {
monitorValue: function( postsRef ) {
var self = this;
postsRef.on('value', function(snapshot) {
self._notifyListeners(postsRef);
});
},
listen: function( callback ) {
this.listeners.push(callback);
},
_notifyListeners: function(data) {
this.listeners.forEach(function(cb) {
cb(data);
}
}
};
function logEvent( data ) {
console.log(data);
}
var observable = new Observable();
observable.listen( logEvent );
observable.monitorValue( /* postsRef goes here */ );
i am new in Angular js.
Static Method in Code Behind
[WebMethod]
public static string GetPracticeLocations()
{
return "[{ id: 1, name: Test AccountName}]";
}
Angular JS Service
appSettings.service('PracticeLocationsService', function () {
this.getPracticeLocations = function () {
var PracticeLocationsData = PageMethods.GetPracticeLocations();
return PracticeLocationsData;
};
});
i want to know how to implement page method in Angular JS.
Any helpful suggustein apricited
Thanks
Probably I'm too late, but you could use defer to call a page method and return a promise,
var getPracticeLocations = function () {
var deferred = $q.defer();
PageMethods.GetPracticeLocations(function (response) {
if (response) {
deferred.resolve({ result: angular.fromJson(response) });
} else {
deferred.resolve({ result: null });
}
},
function (msg, code) {
deferred.reject(msg);
});
return deferred.promise;
};
You want to look at factory() and $http
pseudo code:
angular.factory("PageMethods", ["$http", function($http){
return {
GetPracticeLocations : function(){
return $http.get("/someurl");
}
}
}]);