javascript - Performance of Jquery draggable for 1000s of elements vs re-rendering the elements -


i working on app allows image dragged using draggable utility jquery. there numerous overlay divs associated image many components positioned pixel location. numbers in 1000s.

has done performance numbers on dragging these elements vs dragging image re-rendering other elements following drag?

i'm favoring later approach wanted see if has more insight.

i ended going single svg layer jquery draggable utility active $("#zones_imagesvg").draggable( "enable" ); , multiple rect, circles inside. svg layer drags without lag or skips. approach circumvents multiple div layer solution.

<svg id="zones_imagesvg" class="movecursor" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg" height="430" width="549.4444444444445" style="position: relative;"> <image id="zones_image" width="549.4444444444445" height="430" y="0" x="0" xlink:href="./images/testcampus1_hq_floora.jpg"> <circle id="icon_sensor0" class="handle_svgattrcirc" cx="91.63777777777779" cy="287.14444444444445" r="1.9111111111111112" fill="red"> <circle id="icon_sensor1" class="handle_svgattrcirc" cx="272.0466666666667" cy="332.9155555555556" r="1.9111111111111112" fill="red"> <circle id="icon_sensor2" class="handle_svgattrcirc" cx="412.60888888888894" cy="221.40222222222224" r="1.9111111111111112" fill="red"> <circle id="icon_sensor3" class="handle_svgattrcirc" cx="410.3155555555556" cy="103.8688888888889" r="1.9111111111111112" fill="red"> <rect id="idattrrect0" class="handle_svgattrrect" x="512.1777777777778" y="73.38666666666667" height="74" width="88" fill="#3196bd"> <rect id="idattrrect1" class="handle_svgattrrect" x="416.62222222222226" y="54.27555555555556" height="54" width="48" fill="#3196bd"> <rect id="idattrrect2" class="handle_svgattrrect" x="321.0666666666667" y="25.60888888888889" height="24" width="38" fill="#3196bd"> <rect id="idattrrect3" class="handle_svgattrrect" x="129.95555555555558" y="44.720000000000006" height="44" width="44" fill="#dc143c"> <rect id="idattrrect4" class="handle_svgattrrect" x="416.62222222222226" y="35.16444444444445" height="84" width="38" fill="#a1dc14"> </svg>

a quick sample shows 1000 subitems not seem cause issue. of course, ymmv depending on how complicated subitems get.

jsfiddle

code generate sample div:

$(function () {     $(".dragme").draggable();      var $dragme = $(".dragme.filled");      var maxtop = 250;     var maxleft = 400;      (i = 0; < 1000; i++)     {                 var $newsubitem = $("<div />")             .addclass("subitem");          var randomleft = math.random() * maxleft;         var randomtop = math.random() * maxtop;          $newsubitem.css({             left: randomleft,             top: randomtop         });          $dragme.append($newsubitem);     } });

Comments

Post a Comment

Popular posts from this blog

java - Spring Data JPA: Why findOne(id) executing delete query internally? -

i have 1 application using @manytomany annotation link 2 different entities 1 parent entity. not sure if have implemented properly. when execute .findone() on parent entity's repository find it, @ first fetch data along executing delete queries internally delete record mapping table (a table jpa creates after adding @manytomany annotation.). following generated sql queries , code snippet: java class @entity @table(name = "inventory") public class inventory { @id long id; // many other properties @manytomany(fetch=fetchtype.lazy) private list<stream> streams; @manytomany(fetch=fetchtype.lazy) private list<subject> subjects; } there no other annotation i've put in stream , subject entity class link inventory class. when run app, create following tables: inventory stream subject inventory_stream inventory_subject (inventory_stream , inventory_subject, 2 tables created automatically, don't k...
Read more

python - Mongodb How to add addtional information when aggregating? -

i beginner , wrote line pipeline works, wanna add other information output, screen name , or number of tweets.i tried add under $group gave me syntax error everytime here pipeline: def make_pipeline(): # complete aggregation pipeline pipeline = [ { '$match': { "user.statuses_count": {"$gt":99 }, "user.time_zone": "brasilia" } }, { "$group": { "_id": "$user.id", "followers": { "$max": "$user.followers_count" } } }, { "$sort": { "followers": -1 } }, { "$limit" : 1 } ]; i using on example : { "_id" : objectid("5304e2e3cc9e684aa98bef97"), "text" : "first week of school on :p", "in_reply_to_status_id" : null, "retweet_count" : null, ...
Read more

java - Incorrect order of records in M-M relationship in hibernate -

Image
i have 4 records in bridge table in mysql database. using @manytomany in hibernate, accurate order of employees incorrect incorrect of projects. following required material figure out doing mistake. this source. @entity @table(name="project") public class projectbean { @id @generatedvalue @column(name="project_id") private int projectid; @column(name="title") private string projecttitle; @manytomany(mappedby="projects") private collection<employeebean> employees; public projectbean() { employees = new arraylist<employeebean>(); } //getters & setters } @entity @table(name="employee") public class employeebean { @id @generatedvalue @column(name="employee_id") private int employee_id; @column(name="first_name") private string ...
Read more