Function

The story so far

We're going to talk about two things:

• Function arguments
• Accumulating HTML

You can try the new app.

h2.

The story so far

Let's change the team score example.

The story so far

You have a BS template with some JS to load a navbar, and footer. You know how to make input fields, and buttons. You know how to tie JS code to events. You know how to validate. You know how to use variables to coordinate what happens across events.

Wow! You know a lot of stuff!

Time for a new app. This one is simple. We'll expand it in the next example.

A bit o' tech

We're going to use localStorage. It lets you store data on a user's computer, that a browser can access. For example:

bc.

Let's write a simple app that helps track scores at a sports event. You can try it. Remember to open the dev tools' Console tab, so you can watch for errors as you run the code.

The page starts like this:

Every time a button is clicked, the app adds one to the team's score.

The story so far

You have a BS template with some JS to load a navbar, and footer. You know how to make input fields, and buttons. You know how to tie JS code to events. You know how to validate. You know how to use variables to coordinate what happens across events. You know how to persist data, and erase persisted data when needed.

This lesson adds a few new things:

• An app with multiple pages.
• Generating HTML with JavaScript.
• Adding a library of utility functions copied from the web

Requirements

Goals

Our app will make a fake news feed.

The story so far

An add page

We have two pages in the dog pack app:

• Initialize the record set
• Show the record set

Here's the page that shows the pack:

Let's add a third page to:

• Add a new dog to the pack.

The page will have a form, using the same types of fields you've seen before:

Let's see how it works.

The Add button

Here's the HTML for the add button:

bc.

The story so far

The piggy bank app persisted data to localStorage. localStorage stores string data, with string keys.

Let's make something like the piggy bank app, but a bit more complex

Requirements

Goals

Make an app that tracks your coffee and chocolate expenses. When you buy some coffee, you enter the amount you spend, and it gets added to a coffee total. Same for chocolate.

The totals are persistent.

You can try a partial version of it.