why ans is returning null?

[user_20]

Script include:

function onSubmit() {

   var g = new GlideAjax('validation');

    g.addParam('sysparm_name','checkLength');

    g.addParam('sd',g_form.getValue('short_description'));

    g.getXMLAnswer(getResponse);

    function getResponse(response){

        var ans = JSON.parse(response);

        alert(ans);    //returning null

        if(ans == "false"){

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

            return false;

        }

        return true;

    }

}

client script:

var validation = Class.create();

validation.prototype = Object.extendsObject(AbstractAjaxProcessor, {

    checkLength: function(){

        var short_d = this.getParameter('sd');

        var flag = true;

        if(short_d.length!=20){

            flag = false;

        }

        return JSON.stringify(flag);

    },

    type: 'validation'

});

[Anil Nemmikanti]

Hi @user_20 ,

GlideAjax will not work with OnSubmit client script. By the time scriptinclude returns record may already submitted. It is the reason.

[PrashantLearnIT]

HI @user_20 

The reason GlideAjax isn’t suitable for an onSubmit client script is that the Script Include response may arrive after the record has already been submitted.

[Sarthak Kashyap]

Hi @user_20 ,

I check your code and I found 2 issues 

1. You can not pass parameter directly sd you have to pass like 

ga.addParam('sysparm_short_desc',"Your desc");

2. GlideAjax will not work on OnSubmit Client script.

Please mark my answer correct and helpful if this works for you

Thanks and Regards,

Sarthak