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Check this demo below:

new Vue({
	el: '#app',
  data: {
  	flag: true
  },
  puted: {
  	style() {
      let styleA  = {
          borderBottom: '1px solid red',
          borderRight: '1px solid red'
       };
       
      let styleB = {
        	border: '1px solid green',
          borderRight: '1px solid red'
      }

      return this.flag ? styleA : styleB
     
    }
  },
  methods: {
  	changeStyle() {
    	this.flag = !this.flag;
    }
  }
})
.box {
  width: 100px;
  height: 100px;
}
<html>
  <header>
    <script src="/[email protected]/dist/vue.js"></script>
  </header>
  <body>
    <div id="app">
      <div class="box" :style="style"></div>
      <button @click="changeStyle">changeStyle</button>
    </div>
  </body>
</html>

Check this demo below:

new Vue({
	el: '#app',
  data: {
  	flag: true
  },
  puted: {
  	style() {
      let styleA  = {
          borderBottom: '1px solid red',
          borderRight: '1px solid red'
       };
       
      let styleB = {
        	border: '1px solid green',
          borderRight: '1px solid red'
      }

      return this.flag ? styleA : styleB
     
    }
  },
  methods: {
  	changeStyle() {
    	this.flag = !this.flag;
    }
  }
})
.box {
  width: 100px;
  height: 100px;
}
<html>
  <header>
    <script src="https://cdn.jsdelivr/npm/[email protected]/dist/vue.js"></script>
  </header>
  <body>
    <div id="app">
      <div class="box" :style="style"></div>
      <button @click="changeStyle">changeStyle</button>
    </div>
  </body>
</html>

In this demo, click changeStyle button to toggle two different styles.

Here is step:

  • First, styleA is applied with red borderBottom and red borderRight

  • Click changeStyle button, styleB is applied, green border and red borderRight are expected but only the green border is shown.

  • Click changeStyle button again, as we can see, only red borderBottom is shown, like red borderRight just disappear.

  • Click again, you will never see the red borderRight

Is something wrong with paring virtual node and rendering in VUE?

  • javascript
  • css
  • vue.js
  • virtual-dom
Share Improve this question asked Sep 28, 2018 at 3:59 Clocher ZhongClocher Zhong 2,4561 gold badge19 silver badges37 bronze badges
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3 Answers 3

Reset to default 4

I don't really know exactly why this happens.

As you said, there's probably something wrong with the virtual DOM.

In my experience, when something is wrong with the DOM rendering in Vue, using key would solve the problem. In your case, it did. https://jsfiddle/jacobgoh101/Ld5e8azs/

Just add key to the div with dynamic style

<div class="box" :style="style" :key="style"></div>

key just needs to be any unique value that differentiates the 2 styles

It is a bug, but this issue was considered a wontfix. This is due to the fact that border is a shorthand property.

Edit: Jacob beat me by a few secs, but yes, as was stated in the gh issue, the workaround is use key as a hash to force the render.

Alternative but uglier 'hack' would be to differentiate the borderRight style, so borderRight: '1px solid red' in styleA, and borderRight: '1px solid red ' (notice the whitespace at the end) in styleB.

It makes vue 'think' that borderRight has changed, and 'forces' it to apply the style (and 'skips' an optimisation step where it skips applying a style that vue thinks is already applied).

https://jsfiddle/px5qoaed/

本文标签： javascriptborder style not rendering correctly when toggle style in VUEStack Overflow

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