8/19/2023 0 Comments Backbone js set![]() We learned about the “initialize” property of the object that we pass into, as well as how to manually start the router once our setup tasks have completed. ![]() In this article, we learned how to set up an initialization function for a Backbone.js router. This is accomplished in the example code by placing all of the code that sets up the delay in the “initialize” method. What is being demonstrated here is the fact that you can execute any setup code from the “initialize” method and then start the router manually as you wish. Once the AJAX loader goes away and the message in a green box fades in, the nav links will work as expected. As long as you see that AJAX loader, none of the nav element links work. When the page loads, notice that there is an AJAX loader gif. HERE IS WORKING CODE LINK FOR EXAMPLE # 2: Backbone. Philosophically, Backbone is an attempt to discover the minimal set of data-structuring (models and collections) and user interface (views and URLs) primitives. ![]() The point here was to demonstrate that if you have tasks you’d like to complete before the router is started, you can safely queue them up inside of the “initialize” method. Once you see the green message fade-in, then all of the nav element clicks will work. I have set a five-second timeout that delays the router’s start (the AJAX loader gif is spinning during this timeout). This is because the router has not not been started yet. Notice that when the page loads, if you click any of the nav links, nothing happens. What interests us is the functionality that is provided here. There is no need to discuss the domSetup function in detail it simply fades-in a message and sets up a few click handlers. First, we moved all of the initialization code to the function: domSetup, just to keep the example code short and simple. In Example # 2, we’ve upgraded our initialize method a bit. NOTE: In the code examples that follow, I have removed most of the implementation code so that the example will be shorter and easier to follow. ![]() In the object that we pass to the method, we provide an “initialize” property, which will be a method. Like much of what we have already discussed with regards to Backbone, this functionality is fairly straightforward. The Backbone.js set collection is used to update a model or an array of models in the given collection. In this article, we will learn how to set up an initialization function that will run once, and is guaranteed to do so before the router is started. But what about setup tasks? Sometimes you may want to execute code in preparation for your routes, but these tasks need to be completed before the routes are activated. We’ve discussed setting up route handlers, specifying a default route, graceful actions for corner-cases, as well as passing parameters to routes. In the last few articles of this series, we have learned the basics of setting up routes in Backbone.js. Please note that this repository is no longer on my personal account but on the JavaScript Playground organisation, which is where all future code will live.Learn how to configure a function that initializes your Backbone.js router The code for this tutorial and the entire series is available on Github. ![]() Now new items that are added can be filtered, and are not lost when we filter and then clear the filter. It's just a case of updating the original set of items when a new one is added. Add two more events to the events property:Įvents: ) In a future episode when we add a couple more views, we will tidy this up. The Backbone.js collection reset is used to replace a collection with a new list of models. If you're thinking perhaps this isn't the best way, you're right. Currently, there are two options: call t, or set. If you remember, this view encompasses the entire of our application (its el property is set to "body"), so this is where a lot of our events are set up. Next we need to set up some events on our CartCollectionView. This will set us up nicely for the next article, which will look at Backbone's Router in more detail.įirstly, lets set up the HTML needed to allow a user to filter down by price.įor now we will keep it simple and just let the user search for items less than a particular price. What I'd like to do today is look at how we might filter down items in a collection. Last time I left off we had just written the code to add a new item to our collection. I apologise for such a lull between articles and hopefully it wont be quite so long between this and the next episode! I recommend you go back and skim Part 1 and Part 2 first just to get up to speed. Way back in June last year I published part two of my Backbone series and today, at long last, it's time to pick up the pieces. ![]()
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