javascript - 如何在鼠标移动时从当前鼠标位置获取最近的 anchor

Question

    $('p').on('mousemove',function(event) {
      link = $(event.target).find('a');
      //to find the nearest link and store in the link variable
     console.log(link.html());//to print the link in console
     });

我尝试了这个，但我只能找到段落中的第一个链接但我想找到靠近我的鼠标位置的链接

Answer 1

您可以使用document.elementFromPoint(x, y);并创建某种 jQuery 插件

首先，要查看正在运行的代码，请检查 fiddle

下面代码的使用示例:

$("p").nearest("a", 10);

但是下面的代码只是检查具有所提供距离的元素周围的框。如果它没有返回任何元素，您可以进一步使用它，并选中元素周围距离为 20 像素的框，然后是 30 像素，依此类推。取决于您的需求。

$.fn.nearest = function(selector, radius) {
    var position = this.offset();

    if (!radius) radius = 10; // pixels

    var positions = [];
    var elements = [];

    // so, move up and left by the value of radius variable (lets say its 10)
    // start from the -10 -10 px corner of the element and move all the way to 
    // +10 +10 coordinats to the right bottom corner of the element
    var startX = position.left - radius;
    var startY = position.top - radius;
    var endX = position.left + this.outerWidth(true) + radius;
    var endY = position.top + this.outerHeight(true) + radius;

    var positions = [];

    // create horizontal lines
    // --------------
    //  your element
    // --------------
    for (var x = startX; x < endX; x++) {
        // creates upper line on the startY coordinate
        positions.push([x, startY]);
        // creates bottom line on the endY coordinate
        positions.push([x, endY]);
    }

    // create the vertical positions
    // |              |
    // | your element |
    // |              |
    for (var y = startY; y < endY; y++) {
        // creates the left line on the startX coordinate
        positions.push([startX, y]);
        // creates the right line on the endX coordinate
        positions.push([endX, y]);
    }

    // so now the positions array contains all the positions around your element with a radius that you provided
    for (var i = 0; i < positions.length; i++) {
        // just loop over the positions, and get every element
        var position = positions[i];
        var x = position[0];
        var y = position[1];

        var element = document.elementFromPoint(x, y);
        // if element matches with selector, save it for the returned array
        if ($(element).is(selector) && elements.indexOf(element) === -1) elements.push(element);
    }

    return $(elements);
}