Make checkbox true based on another form's field value

[Savvy]

Hi. I want to make a checkbox "check" true on the incident task form if the category of the incident is "Env" on the incident form.
If someone could help me how can I set a checkbox true based on another form's value.

[Hitoshi Ozawa]

Hi Savvy,

Create a onChange() script on field "Incident" on table "Incident Task" that calls Script Include to check incident's category.

1. onChange() client script

function onChange(control, oldValue, newValue, isLoading, isTemplate) {
    if (isLoading || newValue === '') {
        return;
    }
    var catName = 'Env';

    var ajax = new GlideAjax('IncidentUtilClient');
    ajax.addParam('sysparm_name', 'checkCategory');
    ajax.addParam('sysparm_incident_id', newValue);
    ajax.addParam('sysparm_cat_name', catName);
    ajax.getXMLAnswer(function(answer) {
        alert(answer);
        if (answer.length > 0) {
            if (answer == 'true') {
                g_form.setValue('<field to check>', true);
            } else {
                g_form.setValue('<field to check>', false);
            }
        }
    });
}

Script Include

var IncidentUtilClient = Class.create();
IncidentUtilClient.prototype = Object.extendsObject(AbstractAjaxProcessor, {

    checkCategory: function() {
        var incidentId = this.getParameter('sysparm_incident_id');
		var categoryName = this.getParameter('sysparm_cat_name');
        var grIncident = new GlideRecord('incident');
		grIncident.addQuery('sys_id', incidentId);
		grIncident.addQuery('category', categoryName);
		grIncident.query();
        if (grIncident.hasNext()) {
            return "true";
        }
		return "false";
    },
    type: 'IncidentUtilClient'
});