How does Sightly template work?

In one of the earlier post, I explained how to create a multifield component in sightly and using sling models. In this post, I’ll talk about how to create and use “sightly templates” in your component. Templating is a powerful feature introduced in Sightly, which helps in keeping your code clean and makes it more reusable. Identify the repetitive code blocks in your markup, create a template and reuse it wherever it is required.

Let’s see how to create a template and how to call it:

  1. A basic template can be created by below snippet. Each template requires an identifier. For Instance, in the below snippet I have created a template in a file “message.html” with the name “message1”.
     <template data-sly-template.message1>
    <h2> This is template 1</h2>
    </template> 

    Now that the template is created, we can call using the data-sly-call and data-sly-use it as follows and use it in our code.

    <div data-sly-use.messageRenderer="message.html">
    <sly data-sly-call="${messageRenderer.message1}"/>
    </div>
    
  2. We have seen the example to create a basic template, now we’ll see how to pass parameters to our template.
    <template data-sly-template.message2="${@ message}">
    Message is
    <h2> ${message}</h2>
    </template> 

    To call this template in our code, we’ll have to use the below snippet.

    <sly data-sly-test="${properties.text}"
    data-sly-call="${messageRenderer.message2 @ message=properties.text}"/>

    The entire HTML will look like:template1If there are multiple parameters, pass it as comma separated values.

    <sly data-sly-call="${messageRenderer.message2 @ param1=param1,param2=param2 }"/>

Find the complete code in the Github repository.

Hope it helps !! 🙂

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Multifield Component in Sightly with Sling Models

Starting AEM 6.0, new templating language Sightly now known as HTL is introduced. It offers highly productive enterprise-level web framework that increases security and allows HTML developers without Java knowledge to better participate in AEM projects.

Adobe recommends any new components to be developed using Sightly. Speaking of components, one of the vital components of any AEM application is a multifield component. More often than not, you will come across a requirement where you would have to create a multifield component, be it a social link component or a custom carousel component etc.  This post will talk about creating a multifield component in Sightly using Sling Models.

Infrastructure Used:

  • AEM Instance : 6.2
  • OS: Windows 10

Follow the below Steps to create the multifield component:

  1. Firstly Create a sample AEM project using the maven archetype 10.
  2. Create a new Sightly component. You can take reference from this article. Create the structure like below for multifield componentmultifield (I would be sharing the complete code, don’t worry).
  3. The links get saved in the below format.links
  4. Write a Sling Model to parse these links. Read my earlier post about the issue with sling models in 6.2.
</pre>
<pre>@Model(adaptables = Resource.class)
public class DemoMultiFieldModel {

    Logger logger = LoggerFactory.getLogger(DemoMultiFieldModel.class);

    @Inject
    @Named("links")
    private String[] links;

    private List<Link> list;

    @PostConstruct
    protected void init() throws JSONException {
        logger.info("links" + links);
        this.list = new ArrayList<Link>();
        for (String linkString : links) {
            JSONObject jsonObject = new JSONObject(linkString);
            logger.info("json object is " + jsonObject);
            list.add(new Link(jsonObject.getString("linktext"), jsonObject.getString("linkURL")));
        }
        logger.info("linkList is" + list);
    }

    public List<Link> getList() {
        return list;
    }
}</pre>
<pre>
  1.  Now, invoke this model in your Sightly file.
Demo MultifieldPanel component
<p data-sly-test="${properties.heading}"> ${properties.heading}</p>
<p data-sly-test="${properties.desc}"> ${properties.desc}</p>

<div data-sly-use.linkModel="aem.bootstrap.core.models.DemoMultiFieldModel">
${linkModel.message}
<div data-sly-test="${linkModel.list}" data-sly-list.list="${linkModel.list}">
<b>page:</b> ${list.linktext}
<b>path:</b> ${list.linkURL}
</div>
</div>
  1. You also have to add the nested-multifield.js since nested multifield is not supported OOTB. You can find it in the code repository below.

If everything is fine, your sightly component should look like below:

sightly page

You can clone the code from here.

References :

https://helpx.adobe.com/experience-manager/using/creating-sightly-component.html

https://sling.apache.org/documentation/bundles/models.html

https://helpx.adobe.com/experience-manager/using/domparser.html

Hope it helps !! 🙂