Sets or gets a text input's value. This value will always be of type string, regardless of the text input's inputType.
To reset the text input, restoring any placeholder text, set the value
property to null or undefined.
Changing a text input's value property to null or undefined will set the element's valid property to false and cause the element to visually indicate that it's contents are invalid. For example, a black outline might change to a red outline.
You can remove this visual indication until the next time the element is updated by calling resetValidityIndication().
Notes:
Changing a text input's value in code does not trigger an onChange event.
Using the Input Settings panel in the Editor you can set the type of
a text input. That type is used only for validation purposes. The value
returned by the value property of a text input is always a string,
regardless of the type set in the Editor.
If an element is connected to a dataset, setting the element's value
in code does not set the value of the connected field in the dataset.
That means if you use the dataset to perform a submit, the value changed
in code is not reflected in the submitted item.
To submit the new value using a dataset, set the field's value using the
setFieldValue() function before
performing the submit.