javascript - How to get and append most recent messages from server using jQuery and AJAX? -


i'm working on first simple chat application , issue has me stuck. know i'm trying do, end overthinking it.

basically, have heroku server going:

http://tiy-fee-rest.herokuapp.com/collections/blabbertalk

whenever sends message, added array.

my issue:

i have on set interval every 2 seconds, runs getnewestmessages function. when setinterval working , sends message, keep appending last message sent every 2 seconds. if disable setinterval , call getnewestmessages function myself in separate browser tab, doesn't seem happen. i want make sent message isn't re-appended dom when setinterval active.

this function i'm using check recent messages. it's pretty bloated, sorry that:

  getnewestmessages: function() { $.ajax({   url: http://tiy-fee-rest.herokuapp.com/collections/blabbertalk,   method: 'get',   success: function (data) {     // finds id of recent message displayed in dom     var recentid = $('.message').last().data('id');     var prevmostrecent = 0;     var newmostrecent = [];     jquery.each(data, function(idx,el){       if (el._id === recentid) {         // if 1 of messages on server has id equal         // 1 of messages in dom, saves index in var         prevmostrecent = idx;       }     });     jquery.each(data, function(idx,el){       if (idx < prevmostrecent) {         // if there messages on server lower index         // recent message in dom, pushes them new         // array. basically, creates new array of messages newer         // last 1 displayed in dom.         newmostrecent.push(el);       }     });     (var = 0; < newmostrecent.length; i++) {       console.log(newmostrecent[i]);       if (newmostrecent[i]._id === $('.message').last().data('id')) {         // attempt @ trying remove last dom message         // array of newer messages. main issue         // whole function keep appending recent message         // on , on again.         var result = _.without(newmostrecent, newmostrecent[i]);         console.log('message excluded: ', newmostrecent[i]);         // if array of newer messages contained recent         // dom message, removes , sends appended.         page.appendnewestmessages(result);       }     }     // if array of newer messages doesn't contain recent     // dom message, sends whole array normally.     page.appendnewestmessages(newmostrecent);   },   error: function (err) {    } }); }

here append function: 

appendnewestmessages: function(messagestoappend) { console.log(messagestoappend.reverse());  _.each(messagestoappend.reverse(), function(el, idx, arr) {   var newmessage = {     content: el.content,     timestamp: el.timestamp,     author: el.author,     usericon: el.usericon   }   $.ajax({     url: page.url,     method: 'post',     data: newmessage,     success: function (data) {       page.addonemessagetodom(data);     },     error: function (err) {       console.log("error ", err);     }    }); }) }

can me understand how recent messages server , append them dom without repeats? has been driving me nuts.

thanks , help.


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