javascript - 从javascript函数悬停图像弹出div
问题描述
所以我正在做一些事情,我试图使用此页面上的 JavaScript 函数创建一个弹出式缩放窗口 (div):https ://www.w3schools.com/howto/howto_js_image_zoom.asp
我尝试了几件事,并在这里查看了很多问题,但无法弄清楚。如果需要,我也可以在此处粘贴代码,或者对我正在尝试做的事情进行更多解释。任何建议将不胜感激!
解决方案
更新:
http://jsfiddle.net/gb0xcuwz/23/ 刚刚添加了一点css(这是不言自明的)
(我希望这是你想要的)
老答案:
(保留它以防有人想要它)
好的,所以你在评论中提供了这个:http: //jsfiddle.net/gb0xcuwz/5。
我根据命中和试用方法做了一些更改(它是一个短语?)并想出了这个:http: //jsfiddle.net/gb0xcuwz/16/
这里还有一个代码片段:
function imageZoom(imgID, resultID) {
var img, lens, result, cx, cy;
img = document.getElementById(imgID);
result = document.getElementById(resultID);
//create lens:
lens = document.createElement("img");
lens.setAttribute("class", "img-zoom-lens");
//insert lens:
img.parentElement.insertBefore(lens, img);
//calculate the ratio between result DIV and lens:
cx = 300 / lens.offsetWidth;
cy = 300 / lens.offsetHeight;
//set background properties for the result DIV:
lens.style.backgroundImage = "url('" + img.src + "')";
lens.style.backgroundSize = (img.width * cx) + "px " + (img.height * cy) + "px";
//execute a function when someone moves the cursor over the image, or the lens:
lens.addEventListener("mousemove", moveLens);
img.addEventListener("mousemove", moveLens);
//and also for touch screens:
lens.addEventListener("touchmove", moveLens);
img.addEventListener("touchmove", moveLens);
//img.addEventListener("mouseenter", result);
function moveLens(e) {
var pos, x, y;
//prevent any other actions that may occur when moving over the image:
e.preventDefault();
//get the cursor's x and y positions:
pos = getCursorPos(e);
//calculate the position of the lens:
x = pos.x - (lens.offsetWidth / 2);
y = pos.y - (lens.offsetHeight / 2);
//prevent the lens from being positioned outside the image:
if (x > img.width - lens.offsetWidth) {x = img.width - lens.offsetWidth;}
if (x < 0) {x = 0;}
if (y > img.height - lens.offsetHeight) {y = img.height - lens.offsetHeight;}
if (y < 0) {y = 0;}
//set the position of the lens:
lens.style.left = x + "px";
lens.style.top = y + "px";
//display what the lens "sees":
lens.style.backgroundPosition = "-" + (x * cx + lens.offsetWidth) + "px -" + (y * cy + lens.offsetHeight) + "px";
}
function getCursorPos(e) {
var a, x = 0, y = 0;
e = e || window.event;
//get the x and y positions of the image:
a = img.getBoundingClientRect();
//calculate the cursor's x and y coordinates, relative to the image:
x = e.pageX - a.left;
y = e.pageY - a.top;
//consider any page scrolling:
x = x - window.pageXOffset;
y = y - window.pageYOffset;
return {x : x, y : y};
}
}
document.addEventListener("DOMContentLoaded", function(){
imageZoom("myimage", "myresult");
})
* {box-sizing: border-box;}
.img-zoom-container {
position: relative;
}
.img-zoom-lens {
position: absolute;
border: 3px solid #A9A9A9;
width: 100px;
height: 100px;
}
<body>
<h1>Picture</h1>
<p>Mouse over the image:</p>
<div class="img-zoom-container">
<img id="myimage" src="https://i.imgur.com/50dDbmr.jpg" width="300" height="200">
</div>
</body>
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