I am new to backbonejs. What I am trying to do is, render a template on page load and pass model as data parameter in _.template function. Here is my bacbone code:
var Trip = Backbone.Model.extend({
url: '/trips/' + trip_id + '/show'
});
var InviteTraveller = Backbone.View.extend({
el: '.page',
render: function () {
var that = this;
var trip = new Trip();
trip.fetch({
success: function(){
console.log(trip); //logs trip object correctly
var template = _.template($('#invite-traveller-template').html(), {trip: trip});
that.$el.html(template);
}
});
}
});
var Router = Backbone.Router.extend({
routes: {
'': 'fetchTrip'
}
});
var inviteTraveller = new InviteTraveller();
var router = new Router();
router.on('route:fetchTrip',function () {
inviteTraveller.render();
});
Backbone.history.start();
And here is my sample template:
<script type="text/template" id="invite-traveller-template">
<h3>Trip</h3>
<h3><%= trip.get('name') %></h3>
</script>
On running, I am getting the this in browser window and console shows:
trip is not defined
I am facing this issue since yesterday but could not figure out the solution yet. Not understanding what is going wrong, code also seems to be right. Any help would be greatly appreciated.
Update:
I removed
inviteTravellers.render();
from router.on() and then reloaded the page in browser. I still got same error which means that <script></script> (template) is being compiled before calling render() of InviteTraveller view. What can be the possible reason for this?
I had the same issue (underscore v1.8.2). My fix:
var template = _.template($('#invite-traveller-template').html());
var compiled = template({trip: trip});
that.$el.html(compiled);
You're passing the whole model to the template. Typically you would call model.toJSON and then pass its result to the template. Additionally using <%= in your template to render the attribute, which is meant for interpolating variables from that JSON object you're passing.
You can pass a whole model to the template and use <% ... %> to execute pure Javascript code and use print to get the attribute but it's probably overkill.
Have a look at this fiddle.
You code work perfectfly, here's it
I think that your problem came from another code, not the one you have posted, because there's no way for your view to render if you remove :
inviteTravellers.render();
Try to chaneg <h3><% trip.get('name'); %></h3> by <h3><%= trip.get('name') %></h3>
My code seems to be right but still my template was getting compiled on page load and I was getting trip is not defined error. I did not understand the reason of this behavior yet.
I solved this issue by using handlebarsjs instead of default underscore templates.
Related
I'm trying to working with backbone but I'm missing it's base concepts because this is the first JavaScript MVVM Framework I try.
I've taken a look to some guide but I think I still missing how it should be used.
I'll show my app to get some direction:
// Search.js
var Search = {
Models: {},
Collections: {},
Views: {},
Templates:{}
};
Search.Models.Product = Backbone.Model.extend({
defaults: search.product.defaults || {},
toUrl:function (url) {
// an example method
return url.replace(" ", "-").toLowerCase();
},
initialize:function () {
console.log("initialize Search.Models.Product");
}
});
Search.Views.Product = Backbone.View.extend({
initialize:function () {
console.log("initialize Search.Views.Product");
},
render:function (response) {
console.log("render Search.Views.Product");
console.log(this.model.toJSON());
// do default behavior here
}
});
Search.Models.Manufacturer = Backbone.Model.etc...
Search.Views.Manufacturer = Backbone.View.etc...
then in my web application view:
<head>
<script src="js/jquery.min.js"></script>
<script src="js/underscore.min.js"></script>
<script src="js/backbone/backbone.min.js"></script>
<script src="js/backbone/Search.js"></script>
</head>
<body>
<script>
var search = {};
search.product = {};
search.product.defaults = {
id:0,
container:"#search-results",
type:"product",
text:"<?php echo __('No result');?>",
image:"<?php echo $this->webroot;?>files/product/default.png"
};
$(function(){
var ProductModel = new Search.Models.Product();
var ProductView = new Search.Views.Product({
model:ProductModel,
template:$("#results-product-template"),
render:function (response) {
// do specific view behavior here if needed
console.log('render ProductView override Search.Views.Product');
}
});
function onServerResponse (ajax_data) {
// let's assume there is some callback set for onServerResponse method
ProductView.render(ajax_data);
}
});
</script>
</body>
I think I missing how Backbone new instances are intended to be used for, I thought with Backbone Search.js I should build the base app like Search.Views.Product and extend it in the view due to the situation with ProductView.
So in my example, with render method, use it with a default behavior in the Search.js and with specific behavior in my html view.
After some try, it seems ProductModel and ProductView are just instances and you have to do all the code in the Search.js without creating specific behaviors.
I understand doing it in this way make everything easiest to be kept up to date, but what if I use this app in different views and relative places?
I'm sure I'm missing the way it should be used.
In this guides there is no code used inside the html view, so should I write all the code in the app without insert specific situations?
If not, how I should write the code for specific situations of the html view?
Is it permitted to override methods of my Backbone application?
Basically, you should think of the different parts like this:
templates indicate what should be displayed and where. They are writtent in HTML
views dictate how the display should react to changes in the environment (user clicks, data changing). They are written in javascript
models and collections hold the data and make it easier to work with. For example, if a model is displayed in a view, you can tell the view to refresh when the model's data changes
then, you have javascript code that will create new instances of views with the proper model/collection and display them in the browser
I'm writing a book on Marionette.js, which is a framework to make working with Backbone easier. The first chapters are available in a free sample, and explain the above points in more detail: http://samples.leanpub.com/marionette-gentle-introduction-sample.pdf
Here is my error:
Uncaught NoTemplateError: Could not find template: '<!-- HTML Template -->
<div id="start_div">
<h2>Choose your path to ... // the rest of the template
It is telling me that there is no template but then it outputs the template that it said it could not find.
Here is my code:
require(["jquery", "marionette", "views/StartView" ],
function($, marionette, StartView) {
var SCApp = new marionette.Application();
SCApp.addRegions({
mainRegion: "#center_court"
});
var startView = new StartView();
SCApp.mainRegion.show(startView);
SCApp.start();
}
Here is the StartView.js
define(["jquery", "marionette", "text!templates/startDiv.html"],
function($, marionette, template){
var StartView = marionette.ItemView.extend({
//template: "#start_div"
template: template
});
// Returns the View class
return StartView;
});
Can anyone see what I'm doing wrong? Do I need something for templating in the require method?
Any suggestion are greatly appreciated.
Andrew
Usually Marionette search for a template inside the DOM with an ID equal to the one you reference in your view, so you have to change the loadTemplate from Marionette.TemplateCache in this way:
Backbone.Marionette.TemplateCache.prototype.loadTemplate = function(templateId) {
var template = templateId;
if (!template || template.length === 0){
var msg = "Could not find template: '" + templateId + "'";
var err = new Error(msg);
err.name = "NoTemplateError";
throw err;
}
return template;
};
I actually don't remember where I found this function, I can't find it anymore in Marionette's Wiki, anyway it's working fine for me.
I had the same issue yesterday and found the next interesting facts:
When I've changed the 'not found' template's content, it wasn't changed in error message.
When I've changed it's file name (and updated it in import statement) — the error was fixed, updated content was shown.
... then I've changed the name back, everything was fine.
Looks like some bug with caching.
Upd: here I found deep analysis and solution:
http://blog.icanmakethiswork.io/2014/03/caching-and-cache-busting-with-requirejs.html
The project I am on is currently using Backbone.js to create a website and is using Handlebars (http://handlebarsjs.com/) as the templating system. I am attempting to create a sub-view that gets values from a json document into a corresponding template and then return that to a parent view.
The problem I am running into is that when I use
Handlebars.Compile(referenceViewTemplate)
it then doesn't recognize the template function when I try to replace the tokens using
this.template({ identifier: value })
The template code is:
<div id="reference-template">
<div class="id">{{id}}</div>
<div class="reference">{{content}}</div>
</div>
The backbone model is:
define(['underscore','backbone'],
function(_, Backbone){
var reference = Backbone.Model.extend({
initialize: function(){}
});
return reference;
});
The backbone collection code is:
define(['underscore','backbone','models/reference'],
function(_, Backbone, Reference){
var References = Backbone.Collection.extend({
model: Reference,
parse:function(response){ return response; }
});
return new References;
});
The code in the parent view which calls the reference view is:
this.ref = new ReferenceView();
this.ref.model = this.model.page_refs; //page_refs is the section in the json which has the relevant content
this.ref.render(section); //section is the specific part of the json which should be rendered in the view
And the code in the ReferenceView is:
define([
// These are path alias that we configured in our bootstrap
'jquery','underscore','backbone','handlebars',
'models/reference','collections/references','text!templates/reference.html'],
function($, _, Backbone, Handlebars, Reference, References, referenceViewTemplate) {
var ReferenceView = Backbone.View.extend({
//Define the default template
template: Handlebars.Compiler(referenceViewTemplate),
el: ".overlay-references",
model: new Reference,
events:{},
initialize : function() {
this.model.bind('change', this.render, this);
return this;
},
// Render function
render : function(section) {
//this is where it says "TypeError: this.template is not a function"
$(this.el).append(this.template(References.get(section).get("content")));
return this;
}
});
I know this is a lot to read through and I appreciate anyone taking the time to do so, please let me know if there is anything else I can provide to clarify.
The answer is that apparently I was using the wrong function to compile the html. For some reason I typed in Handlebars.Compiler instead of Handlebars.compile
This hasn't solved all the problems in my project (template is being passed back now, but without the values entered), but at least it's a step forward.
full sample here
I have a very simple backbone js structure.
var Step1View = Backbone.View.extend({
el:'.page',
render:function () {
var template = _.template($('#step1-template').html());
this.$el.html(template);
}
});
var step1View = new Step1View();
var Router = Backbone.Router.extend({
routes:{
"":"home"
}
});
var router = new Router;
router.on('route:home', function () {
step1View.render();
})
Backbone.history.start();
This works well however i am unable to get this simple jquery function called.
$(document).ready(function() {
$('.tip').tooltip();
});
Update
School boy error here. Jquery onload functions need to be placed in the route. I'm very new to backbone so i'm not sure if this is best practice. But the following works.
render:function () {
var that = this;
var savings = new Savings();
savings.fetch({
success:function () {
var template = _.template($('#step3-template').html(), {savings:savings.models});
that.$el.html(template);
// put your jquery good ness here
$('.tip').tooltip();
$(".step3-form").validate();
}
})
}
Looks like you found your answer! Just wanted to also share that you could scope down your jQuery a bit by doing this instead.
savings.fetch({
success:function () {
var template = _.template($('#step3-template').html(), {savings:savings.models});
that.$el.html(template);
that.$el.find('.tip').tooltip();
that.$el.find(".step3-form").validate();
}
What you have in your example works but it's also scanning the whole document every time for HTML with the class tip where you could use the element you just created to scan downward only for the tip you just created inside it. Slight optimization.
Hope this is helpful!
Looks like you found your answer! Just wanted to also share that you could scope down your jQuery a bit by doing this instead.
savings.fetch({
success:function () {
var template = _.template($('#step3-template').html(), {savings:savings.models});
that.$el.html(template);
that.$el.find('.tip').tooltip();
that.$el.find(".step3-form").validate();
}
What you have in your example works but it's also scanning the whole document every time for HTML with the class tip where you could use the element you just created to scan downward only for the tip you just created inside it. Slight optimization.
Hope this is helpful!
I am building an application using the Backbone Boilerplate, and am having some trouble getting underscore template variables to work. I have a resource named Goal. My Goal View's render function looks like this:
render: function(done) {
var view = this;
namespace.fetchTemplate(this.template, function(tmpl) {
view.el.innerHTML = tmpl();
done(view.el);
});
}
I'm calling it inside of another view, like so:
var Goal = namespace.module("goal");
App.View = Backbone.View.extend({
addGoal: function(done) {
var view = new Goal.Views.GoalList({model: Goal.Model});
view.render(function(el) {
$('#goal-list').append(el);
});
}
});
I'm using local storage to save my data, and it's being added just fine. I can see it in the browser, but for some reason, when I load up the app, and try to fetch existing data, i get this error:
ReferenceError: Can't find variable: title
Where title is the only key I'm storing. It is a direct result of calling:
tmpl();
Any thoughts are greatly appreciated.
Your template is looking for a variable title, probably like this <%- title %>. You need to pass it an object like this tmpl({ title: 'Some title' })
Turns out, I wasn't passing in the model when i created the view, which was making it impossible to get the models data. Once I passed in the model correctly, I could then pass the data to tmpl, as correctly stated by #abraham.
render: function(done) {
var
view = this,
data = this.model.toJSON();
clam.fetchTemplate(this.template, function(tmpl) {
view.el.innerHTML = tmpl(data);
done(view.el);
});
},