javascript - detect character before the cursor after keyup in textarea -


i trying implement tagging facebook @friendname. have textarea , wanted detect when user typed in @. how do using keyup listener? possible entered text using keyup? here's have now

$("#recommendtextarea").keyup(function () {         var content = $(this).val(); //content box data         var go = content.match(start); //content matching @         var name = content.match(word); //content matching @friendname          console.log(content[content.length-1]);         //if @ available         if(go.length > 0)         {             //if @abc avalable             if(name.length > 0)             {                //do here             }         }     });

most importantly need index of the'@' user entered.

link 

      (function ($, undefined) {     $.fn.getcursorposition = function() {         var el = $(this).get(0);         var pos = 0;         if('selectionstart' in el) {             pos = el.selectionstart;         } else if('selection' in document) {             el.focus();             var sel = document.selection.createrange();             var sellength = document.selection.createrange().text.length;             sel.movestart('character', -el.value.length);             pos = sel.text.length - sellength;         }         return pos;     } })(jquery);  $("#recommendtextarea").on('keypress', function(e){     var key = string.fromcharcode(e.which);     if(key === '*') {         var position = $(this).getcursorposition();         alert(position); // position         alert($(this).val()); // value      }  });​

i made changes here.


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