How to solve the problem that the selected value does not change after changing the calculated attribute in Vue. The specific operations are as follows

Below I will share with you an article that solves the problem that the selected value does not change after vue changes the calculated attribute. It has a good reference value and I hope it will be helpful to everyone.

Let’s start with the code:

//...  
  {{item.value}}  {{selected}} 
   

The above code uses vue’s v-for instruction to bind data to generate options, but today we are learning to write When I suddenly discovered a problem, I bound the calculated attribute da to the v-for instruction, and then replaced the source data options. As a result, the calculated attribute da was correct, but the selected attribute did not change. That is to say, the text of the drop-down box on the page has not changed when it is not expanded, as shown below:

Here you can see that the option of the drop-down box has been updated, but the selected attribute It is not updated synchronously because it caches the last selected value.

I don’t know if the design here is reasonable, because I rarely use it this way.

But if there are problems, they must be solved. Addselected=''to the calculated attribute in computed, and reset the selected attribute every time the dependency is updated.

The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.

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