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I am writing to report a widespread issue that is currently affecting all DialogFlow ES users in our company. We have encountered a problem where users are unable to manually set parameters in DialogFlow ES training phrases.

Upon investigating, I discovered that selecting text within the training phrases triggers an uncaught exception, which is reported in the Chrome DevTools console as follows:

Uncaught ReferenceError: rangy is not defined
    at HU.default.onSelect (m=dialogflow_core:5719:22)
    at HU.default.mouseUpSelection (m=dialogflow_core:5717:193)
    at HTMLDivElement.dispatch (m=dialogflow_core:709:509)
    at Ab.handle (m=dialogflow_core:705:406)
onSelect @ m=dialogflow_core:5719
mouseUpSelection @ m=dialogflow_core:5717
dispatch @ m=dialogflow_core:709
Ab.handle @ m=dialogflow_core:705

This issue is significantly hindering our ability to effectively use DialogFlow ES, as it impacts some of the basic functionalities. I urge you to review this issue priority and severity.

Thank you for your attention to this matter.

As the exception states the error is related to a missing library (rangy). A quick/dirty fix to this issue while the Google Team works in a patch is to manually inject the missing library.

This can be done by copying the following code in the DevTools console while the DialogFlow ES console is open.

But please be careful when using or sharing this code, as you could potentially inject malicious code in your browser.

function injectScript(url) {
  var script = document.createElement('script');
  script.type = 'text/javascript';
  script.src = url;
  document.head.appendChild(script);
}

injectScript('https://cdnjs.cloudflare.com/ajax/libs/rangy/1.3.1/rangy-core.min.js');
injectScript('https://cdnjs.cloudflare.com/ajax/libs/rangy/1.3.1/rangy-textrange.min.js');