API Data Source and Google Autocomplete

Playing about with google API autocomplete. The basic connection seems great but having an issue trying to bind a parameter ‘input’ to a form field value.
If i enter a static value to ‘input’ everything works correctly but if i bind it to a form field value it breaks. Anyone any ideas.

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here is the code generated for the API.

    <dmx-api-datasource id="api1" is="dmx-fetch" url="https://maps.googleapis.com/maps/api/place/queryautocomplete/json" dmx-param:inputtype="'textquery'" dmx-param:key="'my_API_key_is_here" dmx-param:input="form3.select1.value"></dmx-api-datasource>