Unhandled exception in GlideAjax. Cannot read properties of null (reading 'responseXML')

[StuPayne]

Hello,

I am getting the error message above when I try to execute a script.

It is Client callable.

var GetInstanceInfo = Class.create();

GetInstanceInfo.prototype = Object.extendsObject(global.AbstractAjaxProcessor, {

    initialize: function() {},

    getInstanceName: function() {

        var instanceName_s = gs.getProperty('instance_name');

        gs.info('Instance Name: ' + instanceName_s);

        return instanceName_s;

    },

    getInstanceURL: function() {

        var instanceURL_s = gs.getProperty('glide.servlet.uri');

        gs.info('Instance URL: ' + instanceURL_s);

        return instanceURL_s;

    },

    type: 'GetInstanceInfo',

    isPublic: true

});

function onLoad() {

    // Create my GetInstance Class

    var ga = new GlideAjax('GetInstanceInfo');

    ga.addParam('sysparm_name', 'getInstanceURL');

    ga.getXMLAnswer(function(response) {     

        g_form.setValue('current_instance', response.responseXML.documentElement.getAttribute("answer"));

    });

}

Any ideas why?

[Toderean alexan]

Hello @StuPayne,

 I want to highlight a few things when we work with client-server side calls. We usually have to pack the data when we send it to client side, for that is recommended to use "return new JSON().encode(instanceName_s);", this is for our case and when you load it to client side you need to unpack it from that "JSON" datatype, for this you can use "response.responseXML.documentElement.getAttribute("answer").evalJSON()".

var GetInstanceInfo = Class.create();
GetInstanceInfo.prototype = Object.extendsObject(global.AbstractAjaxProcessor, {
    initialize: function() {},

    getInstanceName: function() {
        var instanceName_s = gs.getProperty('instance_name');
        gs.info('Instance Name: ' + instanceName_s);
        return instanceName_s;
    },

    getInstanceURL: function() {
        var instanceURL_s = gs.getProperty('glide.servlet.uri');
        gs.info('Instance URL: ' + instanceURL_s);
        return new JSON().encode(instanceURL_s);
    },

    type: 'GetInstanceInfo',
    isPublic: true
});
 

function onLoad() {
    // Create my GetInstance Class
    var ga = new GlideAjax('GetInstanceInfo');
    ga.addParam('sysparm_name', 'getInstanceURL');
    ga.getXMLAnswer(function(response) {     
        g_form.setValue('current_instance', response.responseXML.documentElement.getAttribute("answer").evalJSON());
    });
}

[StuPayne]

Both of these solutions worked kind of.  The value is being shown on the sreen.

[Medi C]

@StuPayne 
Is the issue resolved?

[StuPayne]

I've tried everything suggested but not luck.  My manager told me that he has this same issue, and for me to move on.

Thank you all for your help.