如何在Vue.js中调整大小时立即获取元素宽度和高度

Question

如何在Vue.js中调整大小时立即获取元素宽度和高度？ 这是我的代码笔插图 请帮我改变它，直到工作，谢谢！

Codepen

let app = new Vue({ 
 
    el: '#app', 
 
    data: { 
 
    boxs: [{ 
 
     width: 100, 
 
     height: 100 
 
     }, 
 
     { 
 
     width: 100, 
 
     height: 100 
 
     } 
 
    ] 
 
    } 
 

 
});

#app { 
 
    display: flex; 
 
    justify-content: center; 
 
    align-items: center; 
 
    flex-wrap: wrap; 
 
} 
 

 
.resize { 
 
    display: flex; 
 
    justify-content: center; 
 
    align-items: center; 
 
    margin: 5px; 
 
    width: 100px; 
 
    height: 100px; 
 
    overflow: hidden; 
 
    resize: both; 
 
    background-color: #C3E2CE; 
 
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.4.4/vue.js"></script> 
 
<div id="app"> 
 
    <div v-for="box,key in boxs" class="resize"> 
 
    {{ box.width }} x {{ box.height }} 
 
    </div> 
 
</div>

Answer 1

原谅我，但我仍然在学习的Vue为好。我建议你做更多的模块化方法，并提取框，然后循环多少你想要的。请注意，这不是最佳做法，因为w/h框应该来自从根元素加载的道具和数据。

const box = Vue.component("box", { 
 
    template: '<div class="resize">{{ boxWidth }} x {{ boxHeight}}</div>', 
 
    data() { 
 
    return { 
 
     boxWidth: 100, 
 
     boxHeight: 100, 
 
    }; 
 
    }, 
 
    mounted: function() { 
 
    this.$el.addEventListener("mouseup", this.move); 
 
    }, 
 
    methods: { 
 
    move(e) { 
 
     if (e.target == this.$el) { 
 
     this.boxWidth = parseInt(this.$el.style.width); 
 
     this.boxHeight = parseInt(this.$el.style.height); 
 
     } 
 
    } 
 
    } 
 
}); 
 

 
let app = new Vue({ 
 
    el: "#app", 
 
    components: { box: box }, 
 
});

#app { 
 
    display: flex; 
 
    justify-content: center; 
 
    align-items: center; 
 
    flex-wrap: wrap; 
 
} 
 

 
.resize { 
 
    display: flex; 
 
    justify-content: center; 
 
    align-items: center; 
 
    margin: 5px; 
 
    width: 100px; 
 
    height: 100px; 
 
    overflow: hidden; 
 
    resize: both; 
 
    background-color: #C3E2CE; 
 
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.2/vue.js"></script> 
 
<div id="app"> 
 
    <div v-for="b in [0,1]"> 
 
     <box></box> 
 
    </div> 
 
</div>

Answer 2

要获得响应的实际大小调整动作即时反馈，你可能想使用MutationObserver尝试。您可以将它附加到组件的ref点，并在那里侦听突变。

您可以在mounted函数中附加MutationObserver。请务必在destroyed函数中进行任何清理。

const Resizable = { 
 
    template: "<div ref='main' @resize='onResize' class='resize'>{{dims.width}} | {{dims.height}}</div>", 
 
    data() { 
 
    return { 
 
     dims: { 
 
     width: null, 
 
     height: null 
 
     } 
 
    }; 
 
    }, 
 
    mounted() { 
 
    const { 
 
     width, 
 
     height 
 
    } = this.$refs.main.getBoundingClientRect(); 
 

 
    this.dims.width = width; 
 
    this.dims.height = height; 
 

 
    const mutationHandler = mutationList => { 
 
     for (let mutation of mutationList) { 
 
     if (mutation.type === "attributes") { 
 
      const { 
 
      width, 
 
      height 
 
      } = mutation.target.getBoundingClientRect(); 
 

 
      this.dims.width = width; 
 
      this.dims.height = height; 
 
     } 
 
     } 
 
    }; 
 
    const mo = new MutationObserver(mutationHandler); 
 

 
    mo.observe(this.$refs.main, { 
 
     attributes: true, 
 
     childList: true, 
 
     subtree: true 
 
    }); 
 

 
    }, 
 
    methods: { 
 
    onResize() { 
 
     console.log("Resized"); 
 
    } 
 
    } 
 
}; 
 

 
const app = new Vue({ 
 
    el: "#app", 
 
    components: { 
 
    "resizable": Resizable 
 
    }, 
 
    data() { 
 
    return { 
 
     items: [ 
 
     "foo", 
 
     "bar", 
 
     "fizz" 
 
     ] 
 
    } 
 
    } 
 
});

body { 
 
    background-color: #414141; 
 
} 
 

 
.container { 
 
    display: flex; 
 
    align-items: center; 
 
    justify-content: center; 
 
} 
 

 
.resize { 
 
    resize: both; 
 
    margin: 5px; 
 
    width: 100px; 
 
    height: 100px; 
 
    color: black; 
 
    overflow: scroll; 
 
    background-color: white; 
 
    text-align: center; 
 
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.4.4/vue.js"></script> 
 

 
<div id="app"> 
 
    <div class="container"> 
 
    <resizable v-for="item in items" :key="item" class="resize"></resizable> 
 
    </div> 
 
</div>