Auto Populate Lookup Field in Power Page/Power Portal

Step1 – Create JSON Web Template to get Server Data

First create a Web Template with JSON response type and get all required server data using Liquid code. Sample code given below.

{% fetchxml students %}
<fetch version="1.0" mapping="logical" no-lock="false" distinct="true">
<entity name="fbs_student"><attribute name="fbs_passphoto_url"/><attribute name="fbs_studentid"/><attribute name="fbs_email"/><attribute name="fbs_studentname"/>
<order attribute="fbs_studentname" descending="false"/><attribute name="fbs_dateofbirth"/><attribute name="fbs_emergencycontactnumber"/>
<attribute name="fbs_fathername"/><attribute name="fbs_library"/><attribute name="fbs_mothername"/><attribute name="fbs_passphoto"/>
<attribute name="fbs_rollnumber"/><attribute name="fbs_businessunit"/><attribute name="fbs_type"/>
<filter type="and"><condition attribute="fbs_studentname" operator="eq" value="{{user.fullname}}"/></filter></entity></fetch>
{% endfetchxml %}

{% if students.results.entities.size > 0 %}
{
 "results":
 [
  {% for student in students.results.entities %}
   {
     "name":  "{{student.fbs_studentname}}",
     "id": "{{student.fbs_studentid}}",
     "email": "{{student.fbs_email}}",
     "loginuseremail":"{{user.fullname}}"
   }
   {% unless forloop.last %},{% endunless %}
  {% endfor %}
] 
}
{% else %}
No data found.
{% endif %}

Step2 – Create a Page Template and call the Web Template

Create a new Page Template and use the created Web Template without header and footer.

Step3 – Create a Web Page and Use the Page Template

Create a Web page with Home as Parent page and use the created Page Template

Step4 – Create Table Permission to Read Record.

Step5- create new webpage and add entity firm

create a webpage and add an entity form and add below code to call the Web template and bind to lookup.

$(document).ready(function() {
	var id = '{{ request.params.id }}';
    var name = '{{ request.params.name }}';
    var ent = '{{ request.params.ent }}';

    var response = null;

    $.ajax({
        type: "GET",
        url: "/getStudentIDForCustomer/",
        dataType:"json",
        async: false
        }).done(function (json) { 
        response = json
        });
      
        response.results.forEach(function (student) {
          //alert(student.name);
          	$('#fbs_candidateid_name').val(student.name);
            $("#fbs_candidateid_name").attr("value",student.name);
           $("#fbs_candidateid").attr("value",student.id);
           $("#fbs_candidateid_entityname").attr("value","fbs_student");
        });
    
});

now test.

hope it helps.