Ember.js Ember.Templates.helpers has-block() Method

Ember.js is an open-source JavaScript framework used for developing large client-side web applications which are based on Model-View-Controller (MVC) architecture. Ember.js is one of the most widely used front-end application frameworks. It is made to speed up development and increase productivity. Currently, it is utilized by a large number of websites, including Square, Discourse, Groupon, Linked In, Live Nation, Twitch, and Chipotle.

The has-block() method is used to check if the component is invoked with a block or not. 

Syntax:

has-block(the)

Parameters:

• the: It is the name block. 

Return Value: Boolean ‘true’ if the component was invoked with a block. 

Steps to Install and Run Ember.js:

Step 1: To run the following examples you will need to have an ember project with you. To create one, you will need to install ember-cli first. Write the below code in the terminal:

npm install ember-cli

Step 2: Now you can create the project by typing in the following piece of code:

ember new <project-name> --lang en

To start the server, type:

ember server

Example 1: Type the following code to generate the route for this example:

ember generate route has1

app/components/compact2.hbs

HTML

<h1>
    Following block in invoke with component<br/>
    {{yield}}
</h1>

app/templates/has1.hbs

HTML

<Compact2>
    This Block is is invoke with component.
</Compact2>
{{outlet}}

Output:

Ember.js Ember.Templates.helpers has-block() Method

Example 2: Type the following code to generate the route for this example:

ember generate route has2

app/components/compact.hbs

HTML

{{#if (has-block)}}
    <h2>
        {{yield}}
    </h2>
{{else}}
    <h2>
        This comment is from block less component invoke.
    </h2>
{{/if}}

app/templates/has.hbs

HTML

<Compact>
    This Block is is invoke with component.
</Compact>
{{outlet}}

Output:

Ember.js Ember.Templates.helpers has-block() Method

Reference: https://api.emberjs.com/ember/4.4/classes/Ember.Templates.helpers/methods/has-block?anchor=has-block