ESRI API Dojo \ on VS data-dojo-attach-event

Question

Hello; I am studying the ArcGIS API javascript to create widgets and I don`t understand what is the difference between Dojo \ on in the Widget.js file and data-dojo-attach-event in the template.html file. My questions: When Dojo \ on is used and when data-dojo-attach-event? What is the difference between these two snippets of code? In Widget.js file: on(this.alertButton, "click", myFunction ()) myFunction () { topic.publish("alertUser", "I am alerting you."); } In template.html: Thanks.

RobertScheitlin__GISP · Accepted Answer

Alberto,

There are going to be limited times when you will use data-dojo-attach-event. The are a couple of reason for this:

* You will have to have a static widget template, many times a widgets template is dynamically adjusted.
* You can not pause or remove that dijits event.
* Once your template is established it is easier to just edit code based functionality in one place (the js file).
* As people read your code it is harder to figure out where the attached event is coming from as it is in a separate file.

When it comes down to the two snippets of code the function almost identically so there is little to no difference. It is more of a preference.