Use pure CSS to implement filter menu function

In this article, we will use pure CSS to achieve the same effect as Taobao's baby filter menu. Although the example is not as powerful as Taobao, the principle is similar. If you put some effort, you can also achieve the same effect as Taobao. Hope it helps everyone.

Content filtering is a common function on the Web, especially on e-commerce websites. It allows users to filter content and only display content that meets their requirements. A screenshot can better illustrate this function, such as Taobao:

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As shown in the picture above, the user wants to buy a dress. In the entire product list, there are too many products displayed. Customers don't know how to choose the dress they want. A category is provided at the top. Customers select the options they need, and the products that do not meet the conditions will be filtered out. In the picture above, I chose an "elegant" skirt. Of course, you can choose more conditions. I won’t say much more here.

Having said that, in the past, JavaScript (or jquery-based plug-in) was needed to achieve such an effect. For example, CodyHouse’s content filtering example. But for a student who doesn't understand JavaScript (not understanding is not a reason), it is indeed difficult to implement a similar function (sometimes I have personal experience and feel like crying without tears, who said I didn't study hard at the beginning).

Fortunately, puppets can now be implemented without JavaScript. In other words, it is not difficult to implement a content filter with simpler functions using pure CSS. This is what I want to share with you today.

Let’s look at an example first

Let’s look at a simple example first. When the page loads, women’s clothing, men’s clothing and children’s clothing will appear together. When you do the following During operation, there are unexpected effects:

When you click the "Women's Clothing" button, "Men's Clothing" and "Children's Clothing" will be filtered out

When you click the "Men's Clothing" button," Both "women's clothing" and "children's clothing" will be filtered out

When you click the "children's clothing" button, both "women's clothing" and "men's clothing" will be filtered out

Of course, the function of this case is not as good as Taobao It's so NB, but Haodai also implements a function similar to content filtering.

Implementation Principle
The principle of implementing this function is actually not too complicated, but everyone has not paid attention to it. I can summarize it in two aspects:

Powerful selector
To achieve this function, it mainly relies on the universal sibling selection in the powerful CSS selector Selector (E~F) and pseudo-class selector: checked. When a radio button is selected, the content of other categories is hidden:

input[type="radio"]{
    &[id="men"]:checked {
        ~ .women,
        ~ .children{
            ....
        }
    }
}

To control the corresponding .women and .children elements through the above style, you must ensure that the elements are consistent with the input element It’s the brotherly element. This is also the second key point to be discussed below.

Good, matching structure
Using only CSS to make this function requires a rigorous structure, because the disorder of the structure will directly affect the required effect. This is also its shortcoming. One of them is to use the radio button "radio" to match the label. In order to have a nice appearance, if you do not want to display , you need to control the selected "radio" through the for attribute of the label. Therefore, the id value of the input must match the for value of the label. In addition, the name values ​​of all inputs are the same, telling the browser that they belong to a group. For example:

<input type="radio" id="men" name="clothing" />
<label for="men">男装</label>
<input type="radio" id="women" name="clothing"/>
<label for="women">女装</label>
<input type="radio" id="children" name="clothing"/>
<label for="children">童装</label>
<input type="radio" id="reset" name="clothing"/>
<label for="reset">重置</label>

Implementation steps
After understanding the implementation principle, it will be much simpler to complete the effect of the example at the beginning of the article.

HTML

The HTML structure is actually very simple. You only need to pay attention to the matching of input and label and the content element to be filtered and its sibling element. For example, in this example, there are three main categories of content elements: men's clothing.men, women's clothing.women and children's clothing.children.

<p class="container">
    <!-- 必须保证input和label匹配 -->
    <input type="radio" id="men" name="clothing " />
    <label for="men">男装</label>
    <input type="radio" id="women" name="clothing "/>
    <label for="women">女装</label>
    <input type="radio" id="children" name="clothing "/>
    <label for="children">童装</label>
    <input type="radio" id="reset" name="clothing "/>
    <label for="reset">重置</label>
    <!-- 要被过滤的内容元素需要与input元素是兄弟元素 -->
    <p class="tile men">
        <img src="/static/imghwm/default1.png"  data-src="" alt="  class="lazy"   alt="">
    </p>
    <p class="tile women">
        <img src="/static/imghwm/default1.png"  data-src="" alt="  class="lazy"   alt="">
    </p>
    <p class="tile children">
        <img src="/static/imghwm/default1.png"  data-src="" alt="  class="lazy"   alt="">
    </p>
    <!-- 此处省略N个.men、.women和.children元素 -->
</p>

SCSS

It’s much simpler if you understand the principle. Let’s first look at the overall code:

body{
  margin:0;
  text-align:center;
  font-family: Verdana;
  background:#f5f5f5;
}
h1 {
  text-align:center;
}
.container {
  width:90%;
  margin:0 auto;
}
input[type="radio"] {
  display:none;
}
label {
  width:23%;
  float:left;
  text-align:center;
  background:#ffffff;
  box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
  color:#222222;
  padding:0.5%;
  margin:0.5%;
  margin-bottom:30px;
  cursor:pointer;
}
input[type="radio"]{
  &[id="men"]:checked {
    * label {
      background:#6666ff;
    }
    ~ .women,
    ~ .children {
      width:0;
      height:0;
      padding:0;
      margin:0;
      opacity:0;
    }
  }
  &[id="women"]:checked {
    * label {
      background:#ff4466;
    }
    ~ .men,
    ~ .children {
      width:0;
      height:0;
      padding:0;
      margin:0;
      opacity:0;
    }
  }
  &[id="children"]:checked {
    * label {
      background:#66dd99;
    }
    ~ .men, 
    ~ .women {
      width:0;
      height:0;
      padding:0;
      margin:0;
      opacity:0;
    }
  }
}
.tile {
  width:23%;
  float:left;
  transition:all 1s;
  margin:0.5%;
  padding:0.5%;
  background:#6666ff;
  img {
      width: 100%;
    }
}

Simple Analyze this style code.

In order to make the page look better, first hide the :

input[type="radio"] {
  display:none;
}

We use the for attribute of the label to control whether the radio is selected. Beautify the label style:

label {
    width:23%;
    float:left;
    text-align:center;
    background:#ffffff;
    box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
    color:#222222;
    padding:0.5%;
    margin:0.5%;
    margin-bottom:30px;
    cursor:pointer;
}

The next style code is also the most critical part. When the input is selected, the label style:

input[type="radio"]{
  &[id="men"]:checked {
      label {
      background:#6666ff;
    }
  }
  ...
}

Above The code represents when selected: checked, its adjacent label changes the background color.

According to the previous principle introduction, we can know that when we choose "Men's Clothing", then "Women's Clothing" and "Children's Clothing" need to be hidden. Here they are hidden through false images, that is, input[type= "radio"][id="men"] is selected, and its similar sibling elements .women and .children are hidden:

input[type="radio"]{
  &[id="men"]:checked {
    ...
    ~ .women,
    ~ .children {
      width:0;
      height:0;
      padding:0;
      margin:0;
      opacity:0;
    }
  }
}

其他两个选项也是类似的，就不在做过多的阐述。

美化的样式，这里就不说了，大家都懂的。

通过这个过程下来，你就能看到前面DEMO展示的效果了。
总结

本文主要介绍了如何依赖于CSS的属性选择器、通用相邻兄弟选择器和伪类选择器来实现一个简单的Use pure CSS to implement filter menu function的功能。在整个实例当中，要把握的是严谨的HTML结构，因为相邻兄弟选择器对于结构的依赖程度非常的强。也就是说结构修改之后，你的选择器和样式都要做一定的修改。
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