Question

<div class="outerBox">
    <img src="pics/folder1/img1.jpg" alt="small image" class="unmarkedImg">
    <div class="innerBox">
        <img src="pics/folder1/img1.jpg" alt="big image">
        <input type="checkbox"><span>Image</span>
    </div> <!-- innerBox -->
</div> <!-- outerBox -->

我有一个问题需要改变javascript

<img src="pics/folder1/img1.jpg" alt="small image" class="unmarkedImg">

带有复选框<input type="checkbox">的

类。选中该复选框后，img类将从“unmarkedImg”更改为“markedImg”，当您勾选复选框时，更改将反转。

    <div class="outerBox">
    <img src="pics/folder1/img1.jpg" alt="small image" class="unmarkedImg">
    <div class="innerBox">
        <img src="pics/folder1/img1.jpg" alt="big image">
        <input type="checkbox"><span>Image</span>
    </div> <!-- innerBox -->
</div> <!-- outerBox -->

    <div class="outerBox">
    <img src="pics/folder1/img2.jpg" alt="small image" class="unmarkedImg">
    <div class="innerBox">
        <img src="pics/folder1/img2.jpg" alt="big image">
        <input type="checkbox"><span>Image</span>
    </div> <!-- innerBox -->
</div> <!-- outerBox -->

    <div class="outerBox">
    <img src="pics/folder1/img3.jpg" alt="small image" class="unmarkedImg">
    <div class="innerBox">
        <img src="pics/folder1/img3.jpg" alt="big image">
        <input type="checkbox"><span>Image</span>
    </div> <!-- innerBox -->
</div> <!-- outerBox -->

    <div class="outerBox">
    <img src="pics/folder1/img4.jpg" alt="small image" class="unmarkedImg">
    <div class="innerBox">
        <img src="pics/folder1/img4.jpg" alt="big image">
        <input type="checkbox"><span>Image</span>
    </div> <!-- innerBox -->
</div> <!-- outerBox -->

如果我可以打扰另一个问题。我如何更改你提供的javascript，然后更多的人做同样的事情。如果您选中其中一个框，则该复选框的图像将从“unmarkedImg”更改为“markedImg”，然后反转。我只是给主题他们自己的“id”（因为ElementByClassName("class").onclick/onchange不起作用）还是有更容易或更有活力的方式这样做？

Answer 1

jsFiddle here.

我已经概述了一种简单的方法（我假设你只是想在这里使用纯JavaScript），下面有解释：

<强> HTML：

<img id="theImage" src="pics/flowers/f0.jpg" alt="Liten bild" class="unmarkedImg">
<input onclick="toggleImgClass()" id="example" type="checkbox">

<强>使用Javascript：

function toggleImgClass(){
  var example = document.getElementById('example');
  // Set a variable for the checkbox element with the ID 'example' 
  if (example.checked){ // If the checkbox is checked
    document.getElementById("theImage").className = "markedImg"; 
    // Other classes are removed from the image and replaced with markedImg
  }else{ // Else if the checkbox isn't checked
    document.getElementById("theImage").className = "unmarkedImg";
    // Other classes are removed from the image and replaced with unmarkedImg
  }
}

编辑：在回复您更新的问题时，@ smerny对自适应功能的回答的替代方法可能如下所示。

首先，check this new jsFiddle。

<强> HTML：

<div class="outerBox">
  <img src="http://www.microugly.com/images/tutorials/inkscape-small-icon/icon-zoom-pixelated.png" alt="Liten bild" name="images" class="unmarkedImg"/>
  <div class="innerBox">
    <input type="checkbox" onclick="toggleImgClass()" class="example"/>     
    <span>Prästkrage</span>
  </div> 
</div>

<强>使用Javascript：

function toggleImgClass() {
    var example = document.getElementsByClassName('example');
    // Set a variable for all checkbox elements with the class name 'example'
    for(i=0; i<example.length; i++) { // For each element with the class name 'example'
      if (example[i].checked){ // If this one is checked
        document.getElementsByName("images")[i].className = "markedImg";
        // Set its corresponding image to have the markedImg class.
      }else{
        document.getElementsByName("images")[i].className = "unmarkedImg";
        // Set its corresponding image to have the unmarkedImg class.
      }
    }
}

请注意，使用内联JavaScript（例如<input onclick="toggleImgClass()">）不是最佳做法，但在这种情况下，我只是想向您展示一个简单的基本示例JavaScript工作，所以希望你可以自己开始改进它。

Answer 2

这是一种在不向元素添加javascript的情况下编写它的方法： http://jsfiddle.net/Jb7yM/

document.getElementById("MyCheckbox").onclick=function() {
    if(this.checked) {
        document.getElementById("MyImage").className = "markedImg";
    } else {
        document.getElementById("MyImage").className = "unMarkedImg";   
    }
}

编辑：如果您希望能够制作多张图片，可以执行以下操作： http://jsfiddle.net/Jb7yM/2/

var checkboxes = document.getElementsByClassName("MyCheckbox");
for (var i = 0; i < checkboxes.length; i++) {
    checkboxes[i].onclick = function () {
        var imgNode = this.parentNode.firstChild;
        while (imgNode.tagName != "DIV") { //change to IMG in your case
            imgNode = imgNode.nextSibling
        }
        if (this.checked) {
            imgNode.className = "markedImg";
        } else {
            imgNode.className = "unMarkedImg";
        }
    }
}

并将您的图像/复选框分组包装成如下：

<div class="imgGroup">
    <div class="unMarkedImg">img</div><!-- div for example, you'd have an image -->
    <br />
    <input type="checkbox" class="MyCheckbox" />
</div>

编辑2：我看到你在你的问题中添加了你的html，这将与你当前的html一起工作，而不必在你的元素中添加onclicks（通常是我总是尽量避免的练习），所有你需要做的是将“MyCheckbox”类添加到您的复选框（或者将类的名称更改为更适合您的类型）： http://jsfiddle.net/c8DPz/

var checkboxes = document.getElementsByClassName("MyCheckbox");
for (var i = 0; i < checkboxes.length; i++) {
    checkboxes[i].onclick = function () {
        var imgNode = this.parentNode.parentNode.firstChild;
        while(imgNode.tagName != "IMG") { 
            imgNode = imgNode.nextSibling
        }
        if (this.checked) {
            imgNode.className = "markedImg";
        } else {
            imgNode.className = "unMarkedImg";
        }
    }
}

用复选框更改img类

2 个答案: