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I limit myself only to solving the problem based on the interpretation of the code provided, and I eliminate the rest of the code, due to errors due to undefined variables (BASE_URL, last_name, middle_name ...) not provided in the question.
inconsistent / errors:
in formFields.results // According to the code provided, the results attribute does not exist (in formFields) and it is also inconsistent with its capture devtools, where last_name does not exist literally. So I was forced to simulate them (formFields_DataApi).
:value="index" // since with v-model you try to capture fullname then this should be the desired value in your iteration. Changed:
:value="result.fullname" // or result.someAttribute searched
You can run the solution and check the reactivity. I hope it will be useful
<head>
<title>VueJs Introduction</title>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.3/vue.min.js">
</script>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css" crossorigin="anonymous">
<link rel="stylesheet" href="styles.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>
</head>
<body>
<div id="app" style="text-align:center;">
<h1>{{ message }}</h1>
<p></p>
<!-- <select class="details-input form-control select2" id="kt_select_fullname" name="fullname" v-model="formFields.fullname">
<option label="Label"></option>
<option v-for="(result,index) in formFields.results" :key="index" :value="index">{{result.first_name}} {{result.middle_name}} {{result.last_name}}
</option>
</select>
-->
<select class="details-input form-control select2" id="kt_select_fullname" name="fullname" v-model="formFields.fullname">
<option label="Label"></option>
<option v-for="(result,index) in formFields_DataApi" :key="index" :value="result.fullname">
{{result.fullname}} {{result.gender}} {{result.someData}}
</option>
</select>
<pre> {{this.formFields}}</pre>
</div>
<script type="text/javascript">
var vue_det = new Vue({
el: '#app',
data: {
message: 'Only fixed question',
create: false,
edit: false,
formFields: {
id: '',
fullname: ''
},
// ONLY SIMULATION DATA
formFields_DataApi: [{
id: 1,
fullname: 'name1',
gender: 'M',
someData: 'someData'
},
{
id: 2,
fullname: 'name2',
gender: 'F',
someData: 'someData'
},
{
id: 3,
fullname: 'name3',
gender: 'M',
someData: 'someData'
},
]
},
});
</script>
<!-- Optional JavaScript -->
<!-- jQuery first, then Popper.js, then Bootstrap JS -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.slim.min.js" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js" crossorigin="anonymous"></script>
<!--<script src="script.js"></script>-->
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