Question

我正在尝试从jQuery切换到Vue.js，对此我有些犹豫。我在页面上有3个按钮。当我单击一个按钮时，我希望所有其他按钮将背景色更改为绿色，并将被单击的按钮更改为黑色。

使用jQuery只是两行代码，但是我不知道如何使用Vue.js完成它。 Vue.js似乎也没有this关键字。

此外，在这一点上，我想仅应用原始的CSS背景颜色属性，而不是应用类。

这是我的jQuery代码-非常简单

<div class="main-content-area">    
  <div class="btn">Click me!</div>
  <div class="btn">Click me!</div>
  <div class="btn">Click me!</div>    
</div>

const Example = new Vue({
  el: '.main-content-area',
  methods: {
    addEventListeners() {
      $(document).ready(function() {
        $(".btn").click(function() {
          $(".btn").css("background-color", "green"); // Make all buttons green
          $(this).css("background-color", "black"); // Make the clicked button black
        });
      });
    }
  },
  mounted: function() {
    this.addEventListeners();
  }
})

有了Vue.js，我到此为止...

<div class="main-content-area">    
  <div class="btn" @click="changeColor">Click me!</div>
  <div class="btn" @click="changeColor">Click me!</div>
  <div class="btn" @click="changeColor">Click me!</div>    
</div>

const Example = new Vue({
  el: '.main-content-area',
  methods: {
    changeColor() {
      //  Change color to green for all .btn elements
      //  and change  color for clicked .btn to black
    }
  })

Answer 1

使用按钮组件：

HTML：

<div class="main-content-area">

    <my-custom-button component-type="my-custom-button" ></my-custom-button>
    <my-custom-button component-type="my-custom-button"></my-custom-button>
    <my-custom-button component-type="my-custom-button"></my-custom-button>

</div>

JavaScript：

Vue.component("my-custom-button",{
        template : '<div class="btn" :style="buttonStyles" @click="activeThisButton" >Click me!</div>',

    data(){
        return {
        isActive : false,
      }
    },

    computed : {
        buttonStyles(){
        return {
            backgroundColor : this.isActive  ? 'green' : '',
        }
      }
    },

    methods : {
        activeThisButton(){
        // call inactiveAllButtons on parent to deselect all buttons
        this.$root.inactiveAllButtons();
        // active current button
        this.isActive = true;
      }
    }
})

const Example = new Vue
({

    el: '.main-content-area',

    methods : {
        // filter children and find buttons ( by component-type property )
        // and inactive all .
        inactiveAllButtons(){
        var buttons = this.$children.filter(function(child) {
            return child.$attrs['component-type'] === 'my-custom-button';
        });
        for(var i = 0 ; i < buttons.length ; i++ ){
          buttons[i].isActive = false;
        }
      }
    }

});

jsfiddle demo

Answer 2

这是一种更好的方法，无需使用不安全的$root和$children。

<template>
  <div class="hello">
    <button class="btn" @click="activeButton = 0" v-bind:style="{'background-color':buttonColor[0]}">Click me!</button>
    <button class="btn" @click="activeButton = 1" v-bind:style="{'background-color':buttonColor[1]}">Click me!</button>
    <button class="btn" @click="activeButton = 2" v-bind:style="{'background-color':buttonColor[2]}">Click me!</button>
  </div>
</template>

<script>
export default {
  name: "HelloWorld",
  data() {
    return {
      activeButton: 0
    };
  },
  computed: { 
    buttonColor: function() {
      let result = [];
      for (var i = 0; i< 3; i++){
        if (this.activeButton == i){
          result.push('black');
        } else {
          result.push('green');
        }
      }

      return result;
    }
  }
};
</script>

演示：https://codesandbox.io/s/8kz9y0rjj9

您也可以按照{Zoha的建议，将button包装在单独的组件中，但是鉴于您没有要求，我没有这样做。这样可以在组件中隐藏buttonColor实现。

还请注意，使用类是更可取且更简洁的方法：无需难看的buttonColor计算函数。

<template>
  <div class="hello">
    <button class="btn" @click="activeButton = 0" v-bind:class="{'greenBtn':true, 'blackBtn': activeButton == 0}">Click me!</button>
    <button class="btn" @click="activeButton = 1" v-bind:class="{'greenBtn':true, 'blackBtn': activeButton == 1}">Click me!</button>
    <button class="btn" @click="activeButton = 2" v-bind:class="{'greenBtn':true, 'blackBtn': activeButton == 2}">Click me!</button>
  </div>
</template>

<script>
export default {
  name: "HelloWorld",
  data() {
    return {
      activeButton: 0
    };
  },
  }
};
</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
 .greenBtn {
   background-color: green
 }

 .blackBtn {
   background-color: black
 }
</style>

Vue.js-更改除单击的元素以外的所有元素的颜色

2 个答案: