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?

[Rohit Singh]

Hi @StuPayne ,

Can you replace your code and try. I hope you have a field with the name "current_instance" in the table where you are writing On Load Client Script. 

If it doesn't then see what value you are getting in  gs.info('Instance URL: ' + instanceURL_s); as part of troubleshooting.

 ga.getXMLAnswer(prop_result);
function prop_result(response)
{
 g_form.setValue("current_instance",response);
}

If my response helped, please hit the Thumb Icon and accept the solution so that it benefits future readers.

Regards,
Rohit

[Rohit Singh]

Hi @StuPayne 

Can you please mark the response as helpful and accept the solution. If applicable.

By this it will help other readers as well.

Regards,

Rohit 

[Chaitanya ILCR]

Hi @StuPayne ,

update your client script

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);
    });
}

getXMLAnswer parses the answer and shares it. we don't have to write this with getXMLAnswer

response.responseXML.documentElement.getAttribute("answer")

@

Please mark my answer as helpful/correct if it resolves your query.

Regards,
Chaitanya

[Medi C]

Hi @StuPayne 

Please use below onLoad script:

function onLoad() {
    var ga = new GlideAjax('GetInstanceInfo');
    ga.addParam('sysparm_name', "getInstanceURL");
    ga.getXML(processResponse);
}

function processResponse(response) {
    var answer = response.responseXML.documentElement.getAttribute("answer");
    if (answer) {
       g_form.setValue('current_instance', answer);
    }
}