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I was a bit astonished by one reaction of a lightning:input field: whatever I typed in there, nothing appeared in the field. It wasn’t any event handler that I added, but a mistake on my side.

The component was very simple:

<aura:component access="global" controller="MyController">
<lightning:input value="{!v.filterText}"
label="Filter"
name="myFilter"
placeholder="Filter here...!" /> </aura:component>

The issue was, that the aura:attribute with the name “filterText” was not defined.

Okay, sure, that’s a mistake, but: really? No reaction at all? Not even an error message, only pure silence.