如何在画布中的Fabric JS图像中添加文本框弹出窗口（Jquery工具提示或类似文件）？ [英] How to add a text box popup (Jquery tooltip or similar) to a Fabric JS image within a canvas?

问题描述

我正在开发一个Fabric JS项目来映射一个楼层及其房间的位置。

在每个房间位置我添加了一个图标。我希望每次鼠标悬停在图标上方时弹出一个文本框（例如jquery工具提示）。

文本框应显示房间信息（电话号码\ person \ size \等。）
我找到了这个谷歌群组帖子，但没有一个人真的描述了除了分享这个链接

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

推荐答案

第1步：设置你的观察者

Step 1: Set up your watchers

第2步：加载对话框

步骤3：找出页面上边界矩形的位置并移动对话框。

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};
}

这应该足以让你入门。如果其中任何一个没有意义，请告诉我。

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

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