如果选中，如何将选中的选项设置为 true

Question

.filter
   select(name="filter")
     each list in lists
      option(value='?list=' + list, selected=filter == list)= list

HTML 例子

<select name="filter">
  <option value='?list=A'> A </option>
  <option value='?list=B' selected> B </option>
</select>

selected = filter ==list 什么都不做。不确定哪里出了问题。如果它是 'A' 或 'B'

，则需要能够将选择的选项设置为 true

感谢帮助。

Answer 1

selected 属性只需要存在。它没有价值，设置它是多余的并且可能是错误的。

selected
If present, this Boolean attribute indicates that the option is initially selected. If the <option> element is the descendant of a <select> element whose multiple attribute is not set, only one single <option> of this <select> element may have the selected attribute.

https://developer.mozilla.org/en-US/docs/Web/HTML/Element/option

你需要做这样的事情

.filter
    - var lists = ['A','B','C'];
    select(name="filter")
        each list in lists
            if(list=='B')              // < based on condition
                option(selected)= list   // include "selected"
            else
                option()= list           // or not

如果选中，如何将选中的选项设置为 true

How to set the option selected to true if selected

javascript

node.js

pug