How to add a text box popup (Jquery tooltip or similar) to a Fabric JS image within a canvas?

Question

I'm working on a Fabric JS project to map a floor with its rooms' locations.
At each room location I added an icon. I want to have a text box pop up (such as jquery tooltip) each time the mouse hover above the icon.
The text box should show room information (phone number \ person \ size \ etc.) I found this google group post, but no one really described the solution beside sharing this link

Answer 1

Step 1: Set up your watchers

Step 2: Load the dialog

Step 3: Figure out where the bounding rect is on the page and move the dialog.

canvas.observe('mouse:over', function (e) {
    console.log("Everyday I'm hovering");
    showImageTools(e.target);
});
canvas.observe('mouse:out', function (e) {
    $('#imageDialog').remove();
});
function showImageTools (e) {
    var url = 'dialog/imageDialog.htm';
    $.get(url, function(data) {
    // Don't add it twice
    if (!$('#imageDialog').length) {
        $(body).append(data);
    }
    moveImageTools();
});

function moveImageTools () {
    var w = $('#imageDialog').width();
    var h = $('#imageDialog').height();
    var e = canvas.getActiveObject();
    var coords = getObjPosition(e);
    // -1 because we want to be inside the selection body
    var top = coords.bottom - h - 1;
    var left = coords.right - w - 1;
    $('#imageDialog').show();
    $('#imageDialog').css({top: top, left: left});
}
function getObjPosition (e) {
    // Get dimensions of object
    var rect = e.getBoundingRect();
    // We have the bounding box for rect... Now to get the canvas position
    var offset = canvas.calcOffset();
    // Do the math - offset is from $(body)
    var bottom = offset._offset.top + rect.top + rect.height;
    var right = offset._offset.left + rect.left + rect.width;
    var left = offset._offset.left + rect.left;
    var top = offset._offset.top + rect.top;
    return {left: left, top: top, right: right, bottom: bottom};
}

That should be enough to get you started. Let me know if any of this doesn't make sense.

Answer 2

Add span element below the canvas

<span ref="toolTip" class="toolTip">ToolTip</span>

Add style for span element NB: Visibility is hidden by default

.toolTip{
  position: absolute;
  z-index: 1;
  background: rgb(119, 128, 0);
  height: 30px;
  width: 120px;
  padding: 8px;
  font-size: 13px;
  color: #fff;
  visibility: hidden;
}

Add mouse over and mouse out events

 this.$data.canvas.on('mouse:over', function (e) {
        // console.log(e.e.offsetX)
        if (e.target && e.target.feature === 'Seat') {
          self.$refs.toolTip.innerHTML =
            'Seat: ' + e.target.label + '  Row: ' + e.target.rowLabel
          self.$refs.toolTip.style.visibility = 'visible'
          self.$refs.toolTip.style.top = e.e.offsetY + 'px'
          self.$refs.toolTip.style.left = e.e.offsetX + 'px'
        }
      })
      this.$data.canvas.on('mouse:out', function (e) {
        self.$refs.toolTip.style.visibility = 'hidden'
      })