Symptoms

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When you have a client script making an asynchronous GlideAjax using "getXML" and if you use "getAnswer()" function the client script can be prone to inconsistent behavior 

Release

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ALL

Cause

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getAnswer() API is supposed to be used only for Synchronous GlideAJAX 

Resolution

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When you are using getXML("function call") use 

var answer = response.responseXML.documentElement.getAttribute("answer"); 

instead of 

var answer = <synchronous object>.getAnswer();

Inside the function definition 

Additional Information

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https://docs.servicenow.com/csh?topicname=c_GlideAjaxAPI.html&version=latest