javascript - Why is it that the append method duplicates my on-click event results event though i set the div to empty before it is clicked? -


a loop runs through array if usernames request api each of them. div id of streameroffline set empty.now click button offline , list of users offline.however when click button again data gets appends previous on click event , doesn't empty.could me out.

 $(document).ready(function() { // solution call function var streamers = ["streamerhouse","esl_sc2", "freecodecamp", "test_channel"]; var offlinechannels = ""; $('#streameroffline').empty(); //getting twtich requests (i=0; < streamers.length; i++){ $.getjson('https://wind-bow.glitch.me/twitch-api/streams/'+streamers[i]+'', calldata);  } //end loop $('#streameroffline').empty(); function calldata(data) {    $('#streameroffline').empty();     $(document).on('click', '#offlinenow', function(){          if(data["stream"] === null){                offlinechannels = "<p>"+data["_links"]["channel"]+"</p>";              $('#streameroffline').append(offlinechannels);             }       });          $(document).on('click', '#onlinenow', function(){          if (data["stream"] !== null ){           if ( $('#streameronline').text() === null){            alert("empty");          }          $('#streameronline').append("<p>"+data["stream"]["channel"]["status"]+"</p>");              }                });                  }                 });

update: tried setting id empty inside if statement because each time loop runs emptied. leaving me 1 of 2 results expected. 

 $(document).on('click', '#offlinenow', function(){          if(data["stream"] === null){                 $('#streameroffline').empty();              offlinechannels = "<p>"+data["_links"]["channel"]+"</p>";               $('#streameroffline').append(offlinechannels);                }       });

always append after clearing previous data.

$(document).on('click', '#offlinenow', function(){         if(data["stream"] === null){               offlinechannels = "<p>"+data["_links"]["channel"]+"</p>";              $('#streameroffline').empty().append(offlinechannels);             } });

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