Question

添加了在单击按钮时添加放大镜（.img-magnifier-glass）的功能。现在，我想通过单击“取消”按钮来移除玻璃。我对如何编写与“放大”功能一起使用的功能感到困惑。

我试图创建一个添加一个类的函数，该类在“ .img-magnifier-glass”上为“ display：none”。

a <- meuse[meuse$lime == "0" & meuse$landuse == "Ah",]
dim(a)
# [1] 31 12

function magnify(imgID, zoom)
{
    var img, glass, w, h, bw;
    img = document.getElementById(imgID);
    /*create magnifier glass:*/
    glass = document.createElement("DIV");
    glass.setAttribute("class", "img-magnifier-glass");
    /*insert magnifier glass:*/
    img.parentElement.insertBefore(glass, img);
    /*set background properties for the magnifier glass:*/
    glass.style.backgroundImage = "url('" + img.src + "')";
    glass.style.backgroundRepeat = "no-repeat";
    glass.style.backgroundSize = (img.width * zoom) + "px " + (img.height * zoom) + "px";
    bw = 3;
    w = glass.offsetWidth / 2;
    h = glass.offsetHeight / 2;

    /*execute a function when someone moves the magnifier glass over the image:*/
    glass.addEventListener("mousemove", moveMagnifier);
    img.addEventListener("mousemove", moveMagnifier);
    /*and also for touch screens:*/
    glass.addEventListener("touchmove", moveMagnifier);
    img.addEventListener("touchmove", moveMagnifier);
    function moveMagnifier(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);
        x = pos.x;
        y = pos.y;
        /*prevent the magnifier glass from being positioned outside the image:*/
        if (x > img.width - (w / zoom)) { x = img.width - (w / zoom); }
        if (x < w / zoom) { x = w / zoom; }
        if (y > img.height - (h / zoom)) { y = img.height - (h / zoom); }
        if (y < h / zoom) { y = h / zoom; }
        /*set the position of the magnifier glass:*/
        glass.style.left = (x - w) + "px";
        glass.style.top = (y - h) + "px";
        /*display what the magnifier glass "sees":*/
        glass.style.backgroundPosition = "-" + ((x * zoom) - w + bw) + "px -" + ((y * zoom) - h + bw) + "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};
    }
}


function onClick()
{
    magnify("img1", 1.5);
    magnify("img2", 1.5);
    magnify("img4", 1.5);
}

Answer 1

您需要找到添加的元素并将其删除。由于缩放脚本为他们提供了img-magnifier-glass的所有类名称，因此您可以执行以下操作：

function zoomOut() {
   var zooms = document.querySelectorAll(".img-magnifier-glass");
   for(var x=0;x<zooms.length;x++) {
      zooms[x].parentNode.removeChild(zooms[x]);
   }
}

Answer 2

我已经这样做了！感谢您的缩小功能。

这是我的外部 JScript

function magnify(imgID, zoom) {
    var img, glass, w, h, bw;
    img = document.getElementById(imgID);
  
    /* Create magnifier glass: */
    glass = document.createElement("DIV");
    glass.setAttribute("class", "img-magnifier-glass");
  
    /* Insert magnifier glass: */
    //img.parentElement.hidden(glass, img);
    img.parentElement.insertBefore(glass, img);
  
    /* Set background properties for the magnifier glass: */
    glass.style.backgroundImage = "url('" + img.src + "')";
    glass.style.backgroundRepeat = "no-repeat";
    glass.style.backgroundSize = (img.width * zoom) + "px " + (img.height * zoom) + "px";
    bw = 3;
    w = glass.offsetWidth / 2;
    h = glass.offsetHeight / 2;
  
    /* Execute a function when someone moves the magnifier glass over the image: */
    glass.addEventListener("mousemove", moveMagnifier);
    img.addEventListener("mousemove", moveMagnifier);
  
    /*and also for touch screens:*/
    glass.addEventListener("touchmove", moveMagnifier);
    img.addEventListener("touchmove", moveMagnifier);
    function moveMagnifier(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);
      x = pos.x;
      y = pos.y;
      /* Prevent the magnifier glass from being positioned outside the image: */
      if (x > img.width - (w / zoom)) {x = img.width - (w / zoom);}
      if (x < w / zoom) {x = w / zoom;}
      if (y > img.height - (h / zoom)) {y = img.height - (h / zoom);}
      if (y < h / zoom) {y = h / zoom;}
      /* Set the position of the magnifier glass: */
      glass.style.left = (x - w) + "px";
      glass.style.top = (y - h) + "px";
      /* Display what the magnifier glass "sees": */
      glass.style.backgroundPosition = "-" + ((x * zoom) - w + bw) + "px -" + ((y * zoom) - h + bw) + "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};
    }
  }
  function zoomOut() {
    var zooms = document.querySelectorAll(".img-magnifier-glass");
    for(var x=0;x<zooms.length;x++) {
       zooms[x].parentNode.removeChild(zooms[x]);
    }
 }

我使用了 W3Schools [https://www.w3schools.com/howto/howto_js_image_magnifier_glass.asp][1] 中的步骤

在我的 Html 文件中，我使用了一个开关来显示多个图像：

function showmob(mob)
{
    document.getElementById("mymob").className = "img_show";

    switch (mob) {
     case "mob1":
    
        document.getElementById("mymob").src="iphone12.jpg";
        zoomOut();
        magnify("mymob", 3);
        break;
    
     case "mob2":
    
        document.getElementById("mymob").src="samsung.jpg";
        zoomOut();
        magnify("mymob", 3);
        break;
     case "mob3":
    
        document.getElementById("mymob").src="p40.jpg";
        zoomOut();
        magnify("mymob", 3);
        break;
     case "mob4":
    
        document.getElementById("mymob").src="xiaomiRedmi.jpg";
        zoomOut();
        magnify("mymob", 3);
        break;
    }
}

还有 HTML

<tr>
    <td>iphone 12   </td>
    <td>128 GB  </td>
    <td>TrueDepth   </td>
    <td>LiDAR</td>
    <td>IOS 14  </td>
    <td>1.229,00 €    </td>
    <td><button class="iconbtn" onclick="showmob('mob1')"><i class="fa fa-eye" ></i></button></td>
</tr>
<tr>
    <td>samsung galaxy s20  </td>
    <td>128 GB  </td>
    <td>40MP</td>
    <td>108MP(f1.8/PDAF) + 48MP(f3.5) + 12MP(f2.2)  </td>
    <td>ANDROID 11  </td>
    <td>1.399,00 €    </td>
    <td><button class="iconbtn" onclick="showmob('mob2')"><i class="fa fa-eye" ></i></button></td>
</tr>

<tr>
    <td>huawei P40  </td>
    <td>256 GB  </td>
    <td>32 MP   </td>
    <td>50 + 40 + 12 + 3D Tof M </td>
    <td>ANDROID 11  </td>
    <td>899,00  </td>
    <td><button class="iconbtn" onclick="showmob('mob3')"><i class="fa fa-eye" ></i></button></td>
    
</tr>

再次感谢。我试图分发我的解决方案

从图像上取下放大镜

2 个答案: