无法使用jQuery .each循环使类中的各个div可拖动

Question

Problem Overview:

I am creating circular div elements to serve as location markers on a map. My code reads the total number of rows from a database table and executes a loop to create that number of div elements, assigning each a div id using data returned from the database. Each div element is appended to a single div class (marker_mother). All of this works perfectly, resulting in a row of circular div elements on the page.

The next step is to make each individual div element draggable. I am using the .each() jQuery method to loop through all div elements in the class (marker_mother) and set them to draggable using the Draggable interaction from the jQuery UI . I have been using the following Stack Overflow Q&A as a reference: jQuery to loop through elements with the same class . However, all my attempts result in the class being set to draggable and not the individual divs. This means that all divs respond as a unified whole when dragged.

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Code:

 var total_units = ""; $(document).ready(function() { // Triggers PHP script to return number of table rows from DB $('#get_rows').click(function() { $.get('get_coords.php', function(data) { total_units = data; console.log(data); }); }); // Posts row number to DB and returns query data (eg. id and colour) // Uses returned data in construction of circular div elements $('#create_divs').click(function() { for (i = 0; i < total_units; i++) { $.ajax({ type: 'POST', url: 'get_row.php', dataType: 'html', data: { row: i }, success: function(response) { var jsonData = JSON.parse(response); jQuery('<div/>', { id: jsonData.id, css: { "position": "relative", "top": "200", "left": "100", "border-radius": "50%", "width": "100px", "height": "100px", "background": "jsonData.colour", "font-size": "20px", "text-align": "center", "line-height": "100px", "cursor": "move", "z-index": "100" }, href: 'http://127.0.0.1/' + jsonData.id + '.html', text: jsonData.id }).appendTo('.marker_mother'); console.log(response); } }); } }); // Assigns top&left positions of dragged div to variables // Code to store coords in db will be added later var coordinates = function(element) { element = $(element); var top = element.position().top; var left = element.position().left; } // Loops through divs and makes each draggable $('.marker_mother').each(function(index, item) { $(item).draggable({ start: function() { coordinates(item); }, stop: function() { coordinates(item); } }); }); }); 

 /* CSS to define characteristics for the marker div class */ .marker_mother { position: relative; top: 0; left: 0; border-radius: 50%; width: 50px; height: 50px; font-size: 10px; text-align: center; color: black; line-height: 50px; cursor: move; z-index: 100; } 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <script src="http://code.jquery.com/ui/1.12.0/jquery-ui.min.js"></script> 

As mentioned in the overview, I have tried multiple implementations of the .each() function to make the divs draggable (including referring to the DOM object and $(this) ). All attempts result in the class ( marker_mother ) being set to draggable and not the individual divs. I feel there must be something simple I am missing here.

Any ideas or suggestions would be greatly appreciated.

Edit:

HTML markup for the created divs end up looking as follows:

<div class="marker_mother ui-draggable ui-draggable-handle"> == $0
  <div id="0001" href="http://127.0.0.1/0001.html" style="position: relative; border-radius: 50%; width: 100px; height: 100px; background: lime; font-size: 20px; text-align: center; line-height: 100px; cursor: move; z-index: 100;">0001</div>
  <div id="0002" href="http://127.0.0.1/0002.html" style="position: relative; border-radius: 50%; width: 100px; height: 100px; background: lime; font-size: 20px; text-align: center; line-height: 100px; cursor: move; z-index: 100;">0002</div>
  <div id="0003" href="http://127.0.0.1/0003.html" style="position: relative; border-radius: 50%; width: 100px; height: 100px; background: lime; font-size: 20px; text-align: center; line-height: 100px; cursor: move; z-index: 100;">0003</div>
</div>

Solution:

haydenwagner provided the solution in an answer below.

$('.marker_mother div').each(function(index, item) {

Answer 1

To me it looks like you are affecting the marker_mother element instead of its children (the divs that you appended).

Try changing this code:

$('.marker_mother').each(function(index, item) {

to this:

$('.marker_mother div').each(function(index, item) {

so that the elements that you are making draggable in the each function are the divs inside the .marker_mother element.

If this works then you can add a '.marker' or '.'marker-draggable' class to these divs so that your selection can be more explicit (with the code above, all divs inside the '.marker_mother' will become draggable). This may not be necessary if you are only appending draggable elements to the '.marker_mother' element.

Answer 2

The issue is that you looping through all elements with the class marker_mother instead of the children. But in this case you don't need the $.each() loop here.

Just tweak your selector and draggable can handle the rest:

// Assigns top&left positions of dragged div to variables
  // Code to store coords in db will be added later

  var coordinates = function(element) {
    var top = element.position().top;
    var left = element.position().left;
  }

  // Loops through divs and makes each draggable


  $('.marker_mother div').draggable({
    start: function() {
      coordinates($(this));
    },
    stop: function() {
      coordinates($(this));
    }
  });

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Example