javascript - How to determine if user is beginning new word in JS? -

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how you, js or jquery, determine if user typing new word?

what want do:

i writing documentation tool autocompletion different types. if type f.e. @ populate java classes in box, # populate test classes, etc. don't want populate these values, if user writing email yourname@domain.com. need values populate when it's beginning of word.

i aware of keydown, keyup events, etc. don't know how check kind of event properly.

one way save every typed letter in variable , check if previous "letter" space , if was, know it's new word. best/most efficient way this?

one way check what's before @ in input box, using selectionstart:

onload = function() {            var io = document.getelementbyid("io");        io.onkeypress = function(e) {      if(e.charcode == 64 && (          io.selectionstart == 0 || io.value[io.selectionstart-1].match(/\s/)))                document.getelementbyid("ac").innerhtml = "autocomplete!";            else           document.getelementbyid("ac").innerhtml = "";            }  }
<input id="io">  <div id="ac"></div>


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