How to render the value of v-for based on the condition(v-if) provided in vue.js - vue.js

Question

I'm trying to implement the condition provided in the code. My last attempt was like in the one in the code.
<ul class = "details" v-for = "(value, propertyName) in items[this.index]" :key = "value.id">
<li v-if="{{propertyName}} == 'IndustryIdentifiers'">Data not available</li>
<li v-else>{{value}}</li>
</ul>
How can the following be implemented:
v-if="{{propertyName}} == 'IndustryIdentifiers'"

Answer 1

The {{ }} syntax is used to wrap a JavaScript expression that should be output as text. It isn't necessary to use the braces to access data in other contexts. In the case of a v-if the attribute value is already an expression and there's no need to include any special characters to pull in data values.
So it'd be just v-if="propertyName === 'IndustryIdentifiers'":
<ul class="details" v-for="(value, propertyName) in items[this.index]" :key = "value.id">
<li v-if="propertyName === 'IndustryIdentifiers'">Data not available</li>
<li v-else>{{ value }}</li>
</ul>
Here I'm assuming that item[this.index] is an object rather than an array, which is implied by the way you've written your loop.
You could also write it like this:
<ul class="details" v-for="(value, propertyName) in items[this.index]" :key = "value.id">
<li>{{ propertyName === 'IndustryIdentifiers' ? 'Data not available' : value }}</li>
</ul>
You should also be able to remove the this. from the index unless it's also declared locally.
I also wonder whether you're intentionally creating a separate list for each value, with each list only containing a single item. Difficult to know exactly what you're trying to achieve but I would guess that you want the loop inside the <ul> rather than on the <ul>. If you only have a single <li> (as in my second example) then you could move the v-for onto the <li>. If you want to stick to having two <li> elements with v-if/v-else then you'll need to wrap them in a <template> tag to hold the v-for.