Question

我是javascript的新手，这可能非常简单。我试图创建代码，当我点击图像时，相同的图像将以模态启动。这适用于可以查看图像完整大小的投资组合。我的javascript控制台没有错误，但是当我点击图像时没有任何反应。

的javascript：

var modal = document.getElementById("myModal");
var srcImg = document.getElementsByClassName("showFull");
var modalImg = document.getElementById("img01");
var captionText = document.getElementById("caption");
srcImg.onclick = function () {
    modal.style.display = "block";
    modalImg.src = this.src;
    modalImg.alt = this.alt;
    captionText.innerHTML = this.alt;
}

  var exit = document.getElementsByClassName("close")[0];

  exit.onclick = function () {
    modal.style.display = "none";
  };

HTML：

<div class="mySlides fade">
                <img class="slide showFull" src="images/mikesHarder.jpg alt="caption 123" style="width:100%" />
</div>

<div class="mySlides fade">
                <img class="slide showFull" src="images/Going-Green.jpg" alt="caption 123" style="width:100%" />
</div>

<div id="myModal" class="modal">

                      <!-- The Close Button -->
                      <span class="close">&times;</span>

                      <!-- Modal Content -->
                      <img id="img01" class="modal-content"/>
                      <div id="caption"></div>
</div>

的CSS：

.showFull {
    border-radius: 5px;
    cursor: pointer;
    transition: 0.3s;
}

.showFull:hover {opacity: 0.9;}

.modal {
    display: none;
    position: fixed; 
    z-index: 1; 
    padding-top: 100px; 
    left: 0;
    top: 0;
    width: 100%; 
    height: 100%; 
    overflow: auto; 
    background-color: rgb(0,0,0);
    background-color: rgba(0,0,0,0.8);
}

.modal-content {
    margin: auto;
    display: block;
    width: 80%;
    max-width: 480px;
}

.modal-content { 
    animation-name: zoom;
    animation-duration: 0.6s;
}

@keyframes zoom {
    from {transform:scale(0)} 
    to {transform:scale(1)}
}

.close {
    position: absolute;
    top: 15px;
    right: 35px;
    color: #f1f1f1;
    font-size: 40px;
    font-weight: bold;
    transition: 0.3s;
}

.close:hover,
.close:focus {
    color: #bbb;
    text-decoration: none;
    cursor: pointer;
}

@media only screen and (max-width: 700px){
    .modal-content {
        width: 100%;
    }
}

Answer 1

我认为1个问题是srcImg是一个html元素的数组，而不是单个元素，所以当你写srcImg.onclick时它不起作用，因为你只能使用onclick来表示代表DOM的对象一个HTML元素。

Answer 2

    function imgClick(){
        var target = event.target;
        if(target.tagName !== "IMG"){ return }
        target.src
        modal.style.display = "block";
        modalImg.src = target.src;
        modalImg.alt = target.alt;
        captionText.innerHTML = target.alt;
    }

<div onclick="imgClick()">
    <img src="./11.png" alt="111" >
</div>

srcImg是一个数组，onclick应该像这个元素一样使用.onclick = function（）{...}

[变量] .onclick = function（）没有执行，控制台

2 个答案: