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Vue Implementations

Example of Vue v-bind

Attributes are the things within the tags, for instance id, class, or title

Think of v-bind as a way to dynamically change attribute strings. Typically you will change attributes like: style, class, title, etc.

Attriutes, like the span title can be dynamically set:

<div id="app-2"> <span v-bind:title="message"> Hover your mouse over me for a few seconds to see my dynamically bound title! </span> </div>
var app2 = new Vue({ el: "#app-2", data: { message: "You loaded this page on " + new Date().toLocaleString() } });
DO IT
Try changing title to something else like: my_attribute, etc

Let's dynamically set the class. You can set isActive to false in the console by doing app2.isActive = false. When you do that, the color will no longer be red.

var app2 = new Vue({ el: "#app-2", data: { isActive: true } });
.active { color: red; }
<div id="app-2"> <span v-bind:class="{ active: isActive }"> Hello </span> </div>
DO IT
Change isActive to false in the javascript.
Try changing the name of the class from 'active' to something else.

You can set multiple classes in v-bind as well as have regular classes, like so:

var app2 = new Vue({ el: "#app-2", data: { isActive: true, isLarge: true } });
<div id="app-2"> <span class="additional" v-bind:class= "{ active: isActive, large: isLarge }"> Hello </span> </div>
DO IT

The presence of curly braces tells it to evaluate the truthiness if isActive and place active there. So, you can set the class dynamically using a regular v-bind without curly braces:

.blue { color: blue; }
var app2 = new Vue({ el: "#app-2", data: { myClass: "blue" } });
<div id="app-2"> <span v-bind:class="myClass"> Hello </span> </div>
DO IT

Styles

There are two ways to v-bind styles.

1. You can place style objects directly into a v-bind:style

var app = new Vue({ el: "#app" });
<div id="app-2"> <span v-bind:style= '{ fontSize: "15px", color: "orange" }'> Hello </span> </div>
DO IT

2. You can use a data object to specify the style

var app = new Vue({ el: "#app", data: { styleObj: { fontSize: "18px", color: "purple", fontWeight: "bold" } } });
<div id="app"> <span v-bind:class="styleObj"> Hello </span> </div>
DO IT

You can specify multiple style objects like so:

var app = new Vue({ el: "#app", data: { base: { fontSize: "15px", color: "orange" }, override: { color: "blue", border: "1px solid black" } } });
<div id="app"> <span v-bind:class= "[ base, override ]"> Hello </span> </div>
DO IT

The second object overrides the first once, hence the color of the text is blue, not orange.

In the next lesson, we will learn about Example of Vue Components

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