Dot walk and get the display value of the field

[SHALIKAS]

I have two fields on incident table. One is business service which refers to application table and other is medal field which is a string field.

I want that based on the selected application the value of the business criticality should populate on the medal field and if the business criticality value is gold the font color should be red. 

I have written onChange client script on the business service field as follows -

function onChange(control, oldValue, newValue, isLoading, isTemplate) {

  g_form.getReference('business_service', function(br){

    if(br){

        g_form.setValue('u_medal_category',br.busines_criticality);

        var medal=g_form.getControl('u_medal_category');

        if(br.busines_criticality==='gold')

        {

            medal.style.color="red";

        }

        else{

            medal.style.color="";

        }

    }

  });

 }
Using this I am able to populate the value in the medal field and also the color. But I am able to populate the backend value of business criticality in medal field. I want to populate the display value in medal field. I tried using getDisplayValue() but it is returning empty value

[Sandeep Rajput]

@SHALIKAS In case if 

g_form.setValue('u_medal_category',br.getDisplayValue('busines_criticality'));

isn't working, then I recommend you to create a server side script include and instead of using getReference use GlideAjax to get the display value of busines_criticality field.

Hope this helps.

[Sandeep Rajput]

@SHALIKAS That's exactly what I recommended. You can also mark my response an accepted solution.

[SHALIKAS · Accepted solution]

Following is the client script which works for me

function onChange(control, oldValue, newValue, isLoading, isTemplate) {

    if (isLoading) {

        return;

    }

    if (!newValue || newValue == '') {

        g_form.setValue('u_medal_category', '');

        return;

    }

    var ga = new GlideAjax('highlight_medal_category');

    ga.addParam('sysparm_name', "getUserInfo");

    ga.addParam('sysparm_ci', newValue);

    ga.getXMLAnswer(function(answer) {

        var response = JSON.parse(answer);

        g_form.setValue('u_medal_category', response.bus);

        var medal = g_form.getControl('u_medal_category');

        if (response.bus == '1 - Gold') {

            medal.style.color = "red";

        } else if (response.bus == '2 - Silver') {

            medal.style.color = "orange";

        } else if (response.bus == '3 - Bronze') {

            medal.style.color = "green";

        } else {

            medal.style.color = "";

        }

    });

}

Script Include -

var highlight_medal_category = Class.create();

highlight_medal_category.prototype = Object.extendsObject(AbstractAjaxProcessor, {

    getUserInfo: function() {

        var service_ci = this.getParameter('sysparm_ci');

        var gr = new GlideRecord("cmdb_ci_service");

        gr.get(service_ci);

        var bus = gr.busines_criticality.getDisplayValue();

        var response = {};

        response.bus = bus;

        return JSON.stringify(response);

    },

    type: 'highlight_medal_category'

});