Question

我对灯箱有疑问，请参阅my jsFiddle。单击其中一个图像可打开更大版本的绘画作为页面叠加。

如何使用 ESC 键关闭此页面叠加层？

如何使用箭头键移动到下一张图像？

我需要什么样的jQuery插件/ javascript来实现这一目标？

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Answer 1

我在 https://stackoverflow.com/a/67169851/8210884 的回答中提供了纯 Javascript 灯箱或图像弹出模式的完整实现。

上面链接中提到的这个答案允许处理使用 ESC 键隐藏灯箱的问题，以及使用左和右浏览灯箱中的图像 箭头键。

以下是该答案中的代码片段，它们将帮助我们解决这两个问题。

使用 ESC 键隐藏灯箱：

  if(event.keyCode==27){ // If ESC key is pressed
    if(document.getElementById("lightbox-container").classList.contains("showcontainer")){ // LIGHTBOX ON
      document.getElementById("lightbox-container").classList.remove("showcontainer");
    }
  }

使用左右箭头键在 Lightbox 中浏览网页上的所有图像：

else if(event.keyCode==37) { // Left arrow key
    if(document.getElementById("lightbox-container").classList.contains("showcontainer")){ // LIGHTBOX ON
      // first get the URL of image displayed in the LIGHT BOX
      var currimgsrc = document.getElementById("lightbox-cont-img").getAttribute("src");

      // now match the sequence number in the array 
      var serialofarray = 0;
      for(k=0;k<allimgurlarray.length;k++){
        if(currimgsrc == allimgurlarray[k][2]){
          serialofarray = allimgurlarray[k][0];
        }
      }

      // with LEFT arrow, we are supposed to reduce the sequence and then use its ATTR SRC to LIGHT BOX
      if(serialofarray<=0){
        serialofarray = allimgurlarray.length - 1;
      }
      else {
        serialofarray = serialofarray - 1;
      }
      console.log("Left Arrow : "+serialofarray);
      document.getElementById("lightbox-cont-img").setAttribute("src", allimgurlarray[serialofarray][2]);

    }
  }
  else if(event.keyCode==39) { // Right Arrow Key
    if(document.getElementById("lightbox-container").classList.contains("showcontainer")){
      // first get the URL of image displayed in the LIGHT BOX
      var currimgsrc = document.getElementById("lightbox-cont-img").getAttribute("src");

      // now match the sequence number in the array 
      var serialofarray = 0;
      for(l=0;l<allimgurlarray.length;l++){
        if(currimgsrc == allimgurlarray[l][2]){
          serialofarray = allimgurlarray[l][0];
        }
      }

      // with RIGHT arrow, we are supposed to increase the sequence and then use its ATTR SRC to LIGHT BOX
      if(serialofarray>=allimgurlarray.length-1){
        serialofarray = 0;
      }
      else {
        serialofarray = serialofarray + 1;
      }
      console.log("Right Arrow : "+serialofarray);
      document.getElementById("lightbox-cont-img").setAttribute("src", allimgurlarray[serialofarray][2]);
    }
  }

这些与按键事件相关的条件情况在document.onkeydown = function(event)中得到解决。

下面的这段代码对于禁用 IMG 标签上按键事件的默认行为以及在网页上堆叠所有图像非常重要允许使用向左和向右箭头键在灯箱中导航的数组。

// Select all A tags with IMG child nodes
var atagswithimgtag = document.querySelectorAll("a[href]");

// then prevent the default behaviour of A tags by preventing of opening new page by HREF
// as well as collect all the HREF of A tags with images to enable RIGHT and LEFT arrow key
var allimgurlarray = [];
for(i=0;i<atagswithimgtag.length;i++){
  var childAIMGtag = atagswithimgtag[i].childNodes;
  if (childAIMGtag[0].nodeType != Node.TEXT_NODE) // or if (el[i].nodeType != 3)
  {
    // this seems too be a A tag with IMG tag as Childnode

    // first we need to prevent the default behaviour of opening the IMG in New Tab
    atagswithimgtag[i].addEventListener("click", function(event){
      event.preventDefault();
    });

    // second is when we need to fill image URL aray with A HREF
    var listofnodes = atagswithimgtag[i];
    allimgurlarray[i] = [];
    allimgurlarray[i][0] = i;
    allimgurlarray[i][1] = " Image URL is ";//listofnodes.getAttributeNode("title").value;
    allimgurlarray[i][2] = listofnodes.getAttributeNode("href").value;
  }
  console.log(childAIMGtag[0].innerHTML);
}

如何使用esc键关闭灯箱页面叠加

1 个答案: