angular - Implementing "Someone is typing..." functionality in chat application using firebase cloud pub/sub -


i have ported web version of friendlychat example angular 4 suite. can see mine live over here , appears working okay... shall publish opensource shortly.

now want implement feature such when user starts typing in realtime, user b should see "user typing...." message. , when user stops typing message should disappear. obviously, user shouldn't see message if himself typing.

i considering having object in db so:

{   "istyping":true,   "fromdevicetoken": "xxxx" }

... , altering istyping field using firebase realtime.

any better ideas how can achieve this? comments/improvements?

my main question is,

can firebase cloud pub/sub trigger used without persisting typing state in db .. if so, how?

you try this:

 this.messageinput.onkeyup = function(){     when user starts typing update database , set istyping true.      dont forget check if istyping set true not update every      time user presses key }

sample got here


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