使用ajax创建一个选项select from db

Question

我试图在点击按钮时创建一个额外的表单文本字段，这很好，我唯一的问题是选择选项是空白的，当我检查元素时，我看到NAN被添加到它。下面是动态表单元素容器

的设计

<div class="col-sm-6" id="prescription-container">
<div class="row">
<div class="col-md-6">
<div class="form-group">
<label for="drug" class="form-label">Medicine </label>
<select name="drug[]" class="form-control search-select">
<?php echo $drug_drop_down; ?>
</select>
</div>
</div>
<div class="col-sm-6">
<div class="form-group">
<label>Comment</label>
<div class="phone-icon">
<input type="text" class="form-control" name="diagnosis">
</div>
</div>
</div>
</div>
</div>
<div class="col-sm-6">
&nbsp;
</div>
<div class="col-sm-6">
<a href="#" id="add_prescription" class="btn btn-warning"><i class="fa fa-plus"></i>Add
prescription</a>
</div>
</div>

这就是我如何为添加处方按钮实现onclick侦听器

<script>
$("#add_prescription").click(function(e) {
e.preventDefault();
var result="<option value=''>Select Drug<option>";
$.ajax({
type: 'GET',
url: 'drugs',
success: function(data) {
if (data.length > 0) {
$.each(data, function(i, item) {
result += "<option value='" + data.id + "'>"+data.name+"<option>";
})
} else{
result += "<option value='" + data.id + "'>"+data.name+"<option>";
}
$('#prescription-container').append(" <div class='row'> <div class='col-md-6'>" +
"<div class='form-group'>" +
"<label for='drug' class='form-label'>Medicine </label><select name='drug[]'' class='form-control'>" +
+ result +
"</select>" +
"</div>" +
"</div>" +
"<div class='col-sm-6'>" +
"<div class='form-group'>" +
"<label>Comment</label>" +
"<div class='phone-icon'>" +
"<input type='text' class='form-control' name='diagnosis'>" +
"</div>" +
"</div>" +
"</div>" +
"</div>")
}
})
})
</script>

最后这是控制器发回的数据

function () {
$drugs = Medicine::get();
return response()->json( $drugs);
}

现在我的问题是，当我警报(数据)我得到[对象对象]，[对象对象]。这让我修改控制器如下

function () {
$drugs = Medicine::get();
$drug_drop_down = "<option>Select drug</option>";
foreach($drugs as $drug){
$drug_drop_down .="<option value='".$drug->id."'>$drug->name</option>";
}
return response()->json( $drug_drop_down);
}

和onclick监听器

<script>
$("#add_prescription").click(function(e) {
e.preventDefault();
$.ajax({
type: 'GET',
url: 'drugs',
success: function(data) {
$('#prescription-container').append(" <div class='row'> <div class='col-md-6'>" +
"<div class='form-group'>" +
"<label for='drug' class='form-label'>Medicine </label><select name='drug[]'' class='form-control'>" +
+ data +
"</select>" +
"</div>" +
"</div>" +
"<div class='col-sm-6'>" +
"<div class='form-group'>" +
"<label>Comment</label>" +
"<div class='phone-icon'>" +
"<input type='text' class='form-control' name='diagnosis'>" +
"</div>" +
"</div>" +
"</div>" +
"</div>")
}
})
})
</script>

现在，如果我alert(data)，我得到<option>Select drug</option><option value='1'>Quinine</option><option value='2'>Malariaquine</option>，但选择仍然在没有选项的情况下被添加，下面出现在添加的字段

的inspect元素上

<div class="row"> 
<div class="col-md-6">
<div class="form-group">
<label for="drug" class="form-label">Medicine </label>
<select name="drug[]" '="" class="form-control">NaN</select>
</div>
</div>
</div>

我在这里做错了什么?

Answer 1

经过一番搜索才意识到第二种方法应该起作用，除了这个+ + data + "</select>" +意味着我使用+作为一个加法运算符，而不是一个连接器，将其更改为+ data + "</select>" +解决了我的问题。我仍然不明白第一种方法的问题是什么