按钮覆盖

Question

问题是我想为我们销售的每顿饭创建一个叠加层，我想通过 "Order" 按钮激活它，但问题是我似乎不知道如何定位每个特定按钮，以便为每个按钮提供不同的覆盖层
这是 html

    <div class="container">

        <div class="MenuItems">



            <img src="ribeye.jpg">
            <button onclick="on()">Order Now</button>
            <img src="Sirloin.jpg">
            <button onclick="on()">Order Now</button>
            <img src="Skirt.jpg">
            <button onclick="on()">Order Now</button>
            <img src="T-Bone.jpg">
            <button onclick="on()">Order Now</button>
            <img src="TomahawkSteak.jpg">
            <button onclick="on()">Order Now</button>
            <img src="Flank.jpg">
            <button onclick="on()">Order Now</button>
            <img src="Chuck.jpg">
            <button onclick="on()">Order Now</button>
            <img src="BBQChuck.jpg">
            <button onclick="on()">Order Now</button>
            <img src="ribeye.jpg">
            <button onclick="on()">Order Now</button>





        </div>

        <div class="left">
            <div class="SideMenu">
            <ul>
                <li><a href="Menu.html">Steak</a></li>
                <li><a href="Chicken.html">Chicken</a></li>
                <li><a href="Appietizers.html">Appietizers</a></li>
                <li><a href="beverages.html">Bevreges</a></li>
                <li><a href="Desserts.html">Desserts</a></li>
            </ul>

            </div>

        </div>
    </div>

这应该是叠加层之一，但我需要创建多个其他叠加层并能够将它们分配给我选择的任何按钮

    <div id="over">


        <img src="r.png">
        <Button class="AddBtn">-</Button>
        <Button class="SubtractBtn">+</Button>
        <Button class="CloseBtn" onclick="off()">X</Button>




    </div>
















    <script type="text/javascript" src="MenuJS.js"></script>

</body>

</html>

Javascript :

function on() {
    document.getElementById("over").style.display = "block";

  }

  function off() {
    document.getElementById("over").style.display = "none";
  }

这里是 CSS:

#overlay {
    position: fixed;
    display: none;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 2;
    cursor: pointer;
  }

  #over{
    position: fixed;
    display: none;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 3;
    cursor: pointer;
  }


  #over img {
    position: relative;
    left: 35%;
    top: 25%;
    border: 2px crimson;
    width: fit-content;
    border-style: inset;
    height: 280px;
    width: 280px;
  }

  .CloseBtn {

  background-color: crimson;
  font-size: larger;
  color: white;
  border: solid 1px crimson;
  left: 1500px;
  border-radius: 5px;
  position: relative;
  bottom: 220px;


  }

  .AddBtn {
    background-color: crimson;
    font-size: larger;
  color: white;
  border: solid 1px crimson;
  border-radius: 5px;
  position: relative;
  left: 750px;
  top: 200px;
  width: 30px;
}


  .SubtractBtn {
    background-color: crimson;
    font-size: larger;
  color: white;
  border: solid 1px crimson;
  border-radius: 5px;
  position: relative;
  left: 760px;
  top: 200px;
  width: 30px;
}

Answer 1

调用函数时可以将this作为参数传入，在函数中通过event.target访问被点击的元素

HTML:

<button onclick="on(this)">Order Now</button>

JS:

function on() {
  console.log(event.target)
}

对于您正在寻找的功能，您的方法将取决于您如何构建 HTML。

对于最基本的方法，您可以执行以下操作：

HTML:

    <button onclick="on(this)">Order Now</button>
    <div class="over">
        <img src="r.png">
        <p>overlay 1</p>
        <Button class="AddBtn">-</Button>
        <Button class="SubtractBtn">+</Button>
        <Button class="CloseBtn" onclick="off()">X</Button>
    </div>

    <button onclick="on(this)">Order Now</button>
    <div class="over">
        <img src="r.png">
        <p>overlay 2</p>
        <Button class="AddBtn">-</Button>
        <Button class="SubtractBtn">+</Button>
        <Button class="CloseBtn" onclick="off()">X</Button>
    </div>

    <button onclick="on(this)">Order Now</button>
    <div class="over">
        <img src="r.png">
        <p>overlay 3</p>
        <Button class="AddBtn">-</Button>
        <Button class="SubtractBtn">+</Button>
        <Button class="CloseBtn" onclick="off()">X</Button>
    </div>

JS:

function on() {
  event.target.nextElementSibling.style.display = 'block'
}

function off() {
  event.target.parentElement.style.display = 'none'
}

这是利用 nextElementSibling (because the next element after the button is the overlay) and parentElement（closeBtn 的容器，它是叠加层）

按钮覆盖

Buttons Overlays

html

javascript

css

overlay