根據分類名稱過濾div時，如何選擇最初顯示的div元素？

Question

我已經根據它們的類名過濾了一組div。

當我選擇一個過濾器按鈕時，這很好用，但是最初它們都會顯示出來。

我只想顯示“ 2017”類。

這是代碼：

* filter elements*/


filterSelection("all")
function filterSelection(c) {
  var x, i;
  x = document.getElementsByClassName("filterDiv");
  if (c == "all") c = "";
  // Add the "show" class (display:block) to the filtered elements, and remove the "show" class from the elements that are not selected
  for (i = 0; i < x.length; i++) {
    w3RemoveClass(x[i], "show");
    if (x[i].className.indexOf(c) > -1) w3AddClass(x[i], "show");
  }
}

// Show filtered elements
function w3AddClass(element, name) {
  var i, arr1, arr2;
  arr1 = element.className.split(" ");
  arr2 = name.split(" ");
  for (i = 0; i < arr2.length; i++) {
    if (arr1.indexOf(arr2[i]) == -1) {
      element.className += " " + arr2[i];
    }
  }
}

// Hide elements that are not selected
function w3RemoveClass(element, name) {
  var i, arr1, arr2;
  arr1 = element.className.split(" ");
  arr2 = name.split(" ");
  for (i = 0; i < arr2.length; i++) {
    while (arr1.indexOf(arr2[i]) > -1) {
      arr1.splice(arr1.indexOf(arr2[i]), 1);
    }
  }
  element.className = arr1.join(" ");
}

// Add active class to the current control button (highlight it)
var btnContainer = document.getElementById("myBtnContainer");
var btns = btnContainer.getElementsByClassName("btn");
for (var i = 0; i < btns.length; i++) {
  btns[i].addEventListener("click", function() {
    var current = document.getElementsByClassName("active");
    current[0].className = current[0].className.replace(" active", "");
    this.className += " active";
  });
}


.container {
    overflow: hidden;
}

.myBtnContainer{
  margin-top: 30px;
}

.filterDiv {

    display: none; /* Hidden by default */
}

/* The "show" class is added to the filtered elements */
.show {
    display: block;
}

/* Style the buttons */
.btn {
  border: none;
  outline: none;
  padding: 12px 16px;
  background-color: white;
  display: inline;
  width: 20%;
  color: #1d1d1b;
}

.btn:focus,
.btn:hover{
  background-color: white;
  opacity: 0.4;
    color: #1d1d1b;
}


<div id="myBtnContainer">
  <button class="btn" onclick="filterSelection('2013')"> 2013</button><button class="btn" onclick="filterSelection('2014')"> 2014</button><button class="btn" onclick="filterSelection('2015')"> 2015</button><button class="btn" onclick="filterSelection('2016')"> 2016</button><button class="btn active" onclick="filterSelection('2017')"> 2017</button>
</div>


<div class="container">

<div class="wine-row filterDiv 2013">
<img class="wine-bottle" src="http://chateau.flywheelsites.com/wp-content/uploads/2018/08/CUV-SASHA_2014.png" />
</div>


<div class="wine-row filterDiv 2014">
<img class="wine-bottle" src="http://chateau.flywheelsites.com/wp-content/uploads/2018/08/CUV-SASHA_2014.png" />
</div>

<div class="wine-row filterDiv 2015">
<img class="wine-bottle" src="http://chateau.flywheelsites.com/wp-content/uploads/2018/08/CUV-SASHA_2014.png" />
</div>

<div class="wine-row filterDiv 2016">
<img class="wine-bottle" src="http://chateau.flywheelsites.com/wp-content/uploads/2018/08/CUV-SASHA_2014.png" />
</div>

<div class="wine-row filterDiv 2017">
<img class="wine-bottle" src="http://chateau.flywheelsites.com/wp-content/uploads/2018/08/CUV-SASHA_2014.png" />
</div>

</div>

所有年份都在列表中顯示首字母縮寫，直到我從導航中選擇年份后才對項目進行過濾，我希望從一開始就對它們進行過濾，僅顯示2017年元素。

Answer 1

從您的HTML文件中，我看到您已經為類命名，並且添加了足以對其進行過濾的filterDiv 2017。 您還可以為每個div創建一個ID，以便可以通過更改ID來更改首選的Div。