We Keep Coding

Knockout bindings from JSON file

What am I doing wrong with my bindings? I simply get [object HTMLElement] returned for each one.
Please note this is a pared-down version and I will be wanting to access the full range of the JSON values.
Fiddle:
https://jsfiddle.net/0416f0s7/2/
Code:
<div data-bind="text: intro"></div>
function ViewModel(stories) {
var self = this;
self.stories = ko.observableArray(ko.utils.arrayMap(stories, function(story) {
return story.stories;
}));
};
$.getJSON('data.json', function(data) {
window.storyViewModel = new ViewModel(data.stories);
ko.applyBindings(window.storyViewModel);
});
JSON (filename data.json):
{
"stories": [
{
"intro": "Hi",
"outro": "Bye",
"elements": [
{
"title": "Title 1",
"image": "img/image1.jpg",
"paragraph": "Wordswordswords"
},
{
"title": "Title 2",
"image": "img/image2.jpg",
"paragraph": "More wordswordswords"
}
]
}
]
}

Your html change to
`<div data-bind="foreach:stories">
<div data-bind="text: intro"></div>
</div>
your code change to
function test(stories) {
var self = this;
self.stories = ko.observableArray(ko.utils.arrayMap(stories, function (story) {
return story;
}));
}

Meteor + MongoDB: How to get nested data?

I'm new to Meteor and trying to figure out this issue I have.
I'm trying to load data from the Lessons collection based on the route being passed. e.g if /courses/level1/lesson1/1a is passed then show data
Unfortunately this doesn't work.
Am I on the right path or is there a better way of doing this?
Collection
{
"_id": "YSgr3fvjpEBn7ncRa",
"courseId": "level1",
"lesson": [
{
"lessonId": "lesson1",
"freeLesson": true,
"title": "Lesson 1",
"eachLesson": [
{
"eachLessonId": "1a",
"title": "This is (masculine)",
"video": "839843"
},
{
"eachLessonId": "1b",
"title": "That is (masculine)",
"video": "839843"
},
{
"eachLessonId": "1c",
"title": "This is (feminine)",
"video": "839843"
},
{
"eachLessonId": "1d",
"title": "That is (feminine)",
"video": "839843"
},
{
"eachLessonId": "1e",
"title": "Getting to know you",
"video": "839843"
}
]
}
]
}
Routes
Router.route("courses/:courseId/:lessonId/:eachLessonId", {
path:"/courses/:courseId/:lessonId/:eachLessonId",
layoutTemplate: "layoutLessons",
template:"lessons",
onBeforeAction:function(){
var currentUser = Meteor.userId();
if (currentUser) {
Session.set('courseId', this.params.courseId);
Session.set('lessonId', this.params.lessonId);
Session.set('eachLessonId', this.params.eachLessonId);
this.next();
} else {
Router.go('/')
}
},
});
Template helper
Template.lessons.onCreated(function(){
Meteor.subscribe('listLessons');
});
Template.lessons.helpers({
currentLesson: function() {
var currentLesson = Session.get('eachLessonId');
return Lessons.find({"lesson.eachLesson.eachLessonId" : currentLesson});
},
});
HTML
{{#each currentLesson}}
{{title}}
{{video}}
{{/each}}

Instead of storing courseId, lessonId and eachLessonId as Session values, you could use the Iron Router's waitOn and data option.
For example, you could rewrite your route as follows:
Router.route('/courses/:courseId/:lessonId/:eachLessonId', {
name: 'lessons',
layoutTemplate: 'layoutLessons',
template: 'lessons',
onBeforeAction: function() {
let currentUser = Meteor.user();
if (currentUser) this.next();
else Router.go('/');
},
data: function() {
var doc = Lessons.findOne({
"courseId": this.params.courseId,
"lesson.lessonId": this.params.lessonId,
"lesson.eachLesson.eachLessonId": this.params.eachLessonId
});
if (doc) {
var lesson = {};
var lessonId = this.params.eachLessonId;
_.each(doc.lesson, function(i) {
lesson = _.find(i.eachLesson, function(j) {
return j.eachLessonId == lessonId;
});
});
return lesson;
}
return {};
},
waitOn: function() {
return [
Meteor.subscribe('lesson', this.params.courseId, this.params.lessonId, this.params.eachLessonId)
];
}
});
This should set the data context to the requested eachLesson object. However, you may consider setting the data context to a document in the Lessons collection and then just picking certain eachLesson objects. In addition, you should create a publish function which returns just the requested Lessons document and not all of them, like you probably do now in your listLessons publication. You can pass all IDs as arguments to the corresponding publish function.

Javascript/Jquery push json objects into array

I have an json object coming from a $.post in jquery.
In order to loop through and store the data clientside I would like to add it to an array. For each search results that comes back I would like to "append" the array so it grows.
This is my json:
{
"companies": [
{
"companyid": "115",
"saved": false,
"orgnumber": "010101010",
"companyname": "TestCompany",
"header": "header info"
},
{
"companyid": "116",
"saved": false,
"orgnumber": "010101010",
"companyname": "TestCompany",
"header": "header info"
} ]
}
This is what I have come up with so far were data is the json
comming back fron the post ajax request. Obj is just an object holding the array
which I declared further up in my code. obj.companies = new Array();
obj.companies.push(data['companies']);
The next part I need to loop out the array. Trying to do it like this.
$.each(obj.companies, function(i, item) {
// Does not alert correctly.
alert(item.header);
});
So I need to push the full json object into the array. But I cannot alert the item.header within the loop, how can I accomplish this?
EDIT:
Thanks everyone. Sorry if my question wasnt detailed enough.
I ended up doing this:
getcompanies: function() {
obj = this;
$.post('api/finder/result.php', {}, function(data) {
$.each(data.companies, function(i, item) {
obj.companies.push(item);
});
obj.loadcompanies();
}, "json");
},
loadcompanies: function() {
$.each(this.companies, function(i, item) {
alert(item.header);
}
}

I believe there is a issue with your server side code which is responsible for building JSON object which is getting returned via Ajax. The Correct JSON should be as follows:
{
"companies": [
{
"companyid": "115",
"saved": false,
"orgnumber": "010101010",
"companyname": "TestCompany",
"header": "header info"
},
{
"companyid": "116",
"saved": false,
"orgnumber": "010101010",
"companyname": "TestCompany",
"header": "header info"
}
]
}
Please note that there is only single key with name "companies" which holds an array of objects. Please correct your server side code to get such valid JSON. You can use free online JSON validator tools such as http://jsonlint.com/ to validate your JSON objects.
Now once you get such response from server; you just need to do following steps to get the companies array (following code will go into $.post success handler):
var jsonResp = JSON.parse(postResponse); //postResponse is the success resp of $.post
var companiesArray = jsonResp.companies;
$.each(companiesArray , function (index, valueObj){
var compId = valueObj.companyid;
var isSaved = valueObj.saved;
});
I hope this will help you a bit.

if you want to append new company into your companies array you should
var json_obj = {
"companies": [
{
"companyid": "115",
"saved": false,
"orgnumber": "010101010",
"companyname": "TestCompany",
"header": "header info"
},
{
"companyid": "116",
"saved": false,
"orgnumber": "010101010",
"companyname": "TestCompany",
"header": "header info"
} ]
};
//adding new company into your companies array
json_obj.companies.push({
"companyid":"117",
"saved" : false,
"orgnumber": "20120313",
"companyname":"anotherCompany",
"header":"another header info"
});
//if you want to loop through your companies list you can:
json_obj.companies.map(function ( obj ){
console.log(obj.companyid);
console.log(obj.companyname);
etc..
});

How can I filter results in typeahead.js using a second variable?

I am trying to filter results using Typeahead.js. I can currently filter the results using a field called activity_title. This works fine.
How can I filter my results by a second value? In this case, I would like to select only the results that have a certain value for activity_level. I need to set this when the typeahead is initialised rather than hard coding it into the Bloodhound initialisation (e.g. I don't want to use url: 'api/activity/&range=1,3')
I have the following valid JSON that I access remotely:
{
"meta": [
{
"name": "activity_id",
"table": "table",
"max_length": 4
},
{
"name": "activity_title",
"table": "table",
"max_length": 91
},
{
"name": "activity_level",
"table": "table",
"max_length": 2
}
],
"detail": [
{
"activity_id": "57",
"activity_title": "Help old ladies to cross the road.",
"activity_level": "2"
},
{
"activity_id": "58",
"activity_title": "Help mum with the washing up.",
"activity_level": "3"
},
{
"activity_id": "59",
"activity_title": "Shine my shoes",
"activity_level": "1"
},
{
"activity_id": "60",
"activity_title": "Put the bins out",
"activity_level": "1"
}
]
}
I set up a Bloodhound instance like this:
var activities = new Bloodhound({
datumTokenizer: function (datum) {
return Bloodhound.tokenizers.whitespace(datum.activity_title);
},
queryTokenizer: Bloodhound.tokenizers.whitespace,
prefetch: {
url: '/api/activity/',
filter: function(data) {
return $.map(data['detail'], function(detail) {
return {
activity_id: detail.activity_id,
activity_title: detail.activity_title,
objective_level: detail.objective_level
};
});
}
}
});
I use Typeahead.js to do a lookup on the data as I type.
$( document ).on( "focus", ".typeahead-init", function() {
// + '&range=' + minimum + ',' + maximum
var minimum = $('#group-level-min-1').val();
var maximum = $('#group-level-max-1').val();
$(this).typeahead({
highlight: true
},
{
name: 'activity_title',
displayKey: 'activity',
source: activities.ttAdapter(),
templates: {
header: '<div class="header-name">Activities</div>',
empty: [
'<div class="empty-message">',
'No activities match your search',
'</div>'
].join('\n'),
suggestion: Handlebars.compile('<div class="typeahead-activity" id="typeahead-activity-{{activity_id}}"><strong>{{objective_level}}</strong> - {{activity_title}}</div>')
}
})
//info on binding selection at https://github.com/twitter/typeahead.js/issues/300
.bind('typeahead:selected', function(obj, datum, name) {
var target = $(this).closest('.activity-container');
var activityId = datum['activity_id'];
var url = '/api/activity/id/'+activityId;
$(target).children('.activity-id').val(activityId);
//http://runnable.com/UllA9u8MD5wiAACj/how-to-combine-json-with-handlebars-js-for-javascript-ajax-and-jquery
var raw_template = $('#activity-output').html();
// Compile that into an handlebars template
var template = Handlebars.compile(raw_template);
// Fetch all data from server in JSON
$.get(url,function(data,status,xhr){
$.each(data,function(index,element){
// Generate the HTML for each post
var html = template(element);
// Render the posts into the page
target.append(html);
});
});
});
$(this).removeClass("typeahead-init");
$(this).focus();
});
This has been cobbled together from several answers on Stackoverflow and others. Any help greatly appreciated.

How get extra information from json?

I use can.Component to dispay JSON on the page.
can.Component.extend({
tag: "some-app",
scope: {
items: new Items.List({}),
displayedItems: function () {
...
return items;
}
},
helpers: {
...
},
events: {
"{Items} created": function (Items, ev, newItem) {
...
}
}
})
How can I get "meta" section of received JSON (below) to the scope or helpers?
{
"data": [
{
"description": "Some text",
"id": 1,
"measurement": "pcs",
"name": "Name of item",
"resource_uri": "/api/v1/item/1/"
},
{....}, {....}
}
],
"meta": {
"limit": 20,
"next": null,
"offset": 0,
"previous": null,
"total_count": 3
}
}
I can get it in console with Items.findAll().then(function(info){console.log(info.attr('meta'))}) , but I'm noob in (can.)js and can't understand how to get it in the place I need.

Instead of this:
scope: {
items: new Items.List({})
}
make the request:
scope: {
items: Items.findAll()
}
There are other ways to do this as well, in the template(not advised), or creating the request in another controller or component and passing in to the instantiation of the component.
If you want more specifics, you would nee to update your question with more details on your model.