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_extId
If When you open a new form via, for example, the Link (Email/Web Page) share URL, you you will always open a new form instance. As you use the form and enter values into the form, the values are immediately cached on the Form Server as you tab to the next form field. If you close the browser tab/window containing the form prior to submitting the form, the Form Server still retains this form instance. By using the special (reserverd) URL parameter called _extId, it is possible to reconnect to an in-memory form instance.
The behavior of the _extID parameter has changed, making it more secure. In Live forms v5.1.1, the original form instance data cannot be accessed from Access to form instance is secure.The form instance cannot be accessed from a different browser or a different device. For Example, if you use the same _extID value in a different browser or on a different device, the form will not load the same instance (i.e the same values filled in the form fields) irrespective of the browser used or the logged in user.
Form instance data will only be loaded if the same _extID value is used in a different even if you are logged into as the same user.
To utilize this feature, try this example:
- Copy the the Link (Email/Web Page) share URL for one of your forms and append ?_extId=123 to the formtype URL. Open that URL in your browser and start filling in a form. Do NOT submit the form.
- Next, open a 2nd browser tab or window and use just the formtype URL and it will be blank. A new form instance is created.
- Open a 3rd browser tab or window and use the share URL again appended with ?_extId=123, and you'll get back to the 1st instance.
If you prefer browser refresh to reconnect to the current form instance, use _extId.