Empty Chat Message sending

Issue Description

When the prop alwaysShowSend={true} Without any text message, if click Send , it will send an empty message. This is not appropriate. Empty messages should not be sent.

Steps to Reproduce / Code Snippets

Set the prop alwaysShowSend={true} and click Send button from UI. It will send empty message.

Expected Results

Empty message should be be sent.

Additional Information

• Nodejs version: 10.6.2
• React version: 16.5.2
• React Native version: 0.56.0
• react-native-gifted-chat version: 0.7.3
• Platform(s) (iOS, Android, or both?): checked on iOs only.

[cromatikap]

I’m on the opposite situation: I’d like onSend to be triggered even if the text input is empty (to send an attached image), I set alwaysShowSend prop to true and literally always show the send button, not trigger it. If someone has a simple way to do it I’d be glad to know it

[adilosa]

Since messages may be extended with custom fields, e.g. image messages, the definition of “empty” would also need to be customizable. Perhaps an additional prop could be added that accepts a function which defines how to filter messages.

However, this can already be accomplished by implementing onSend.

onSend = (messages: IMessage[]) => 
    messages.filter(msg => msg.text !== "").forEach(msg => sendMyMessage(msg));