foo.java

// We created our link dynamically from here
@Override
	public Map<String, String> getLinks() {
		Map<String, String> links = new HashMap<String, String>();
		
		if (ModuleUtil.compareVersion(OpenmrsConstants.OPENMRS_VERSION, DIAGNOSIS_MIGRATION_LEAST_SUPPORTED_VERSION) >= 0) {
			links.put("module/emrapi/MigrateDiagnosis.form", Context.getMessageSourceService().getMessage("emrapi.migrateDiagnosis.migrateDiagnosisLink.name"));
		}
		return links;
	}

// Looking at our admin page(https://demo.openmrs.org/openmrs/admin/index.htm), the link is dynamically created by
// the above code.
// Now we wanna create an alert box when that link is clicked.

// Lets assume some JS code. We assume it compiles :)
$('#linkId').onClick(function(){
  // Just make an alert
  alert('Hey you clicked me');
});

// Buts Oooppss, we don't have the id.

@dkayiwa The issue is that we don't have an id referencing the link. Since this link was dynamically generated

Well does this make sense here?
Selecting that element using the href attribute!

$("a[href$='module/emrapi/MigrateDiagnosis.form']")...

cc: @dkayiwa