我使用的是动态相关的Twitter-TypeAhead，其中，用户在html选择框中选择一个值后，将填充输入文本。当用户在输入文本下拉列表中选择一个选项并使用php或jquery在div中显示此值后，我想获取一个值。实际上，我想在div中显示的值来自产品表“ image”列。
为此，我创建了一个调用products的表，其结构如下：
id | productName | categoryFK | image
---------------------------------------------
01 | Nike Tenis | 1 | 001.jpg
02 | Adidas T-shirt | 2 | 002.jpg
03 | H. Shoes | 1 | 003.jpg
->台式产品包含一个调用的前键 categoryFK
并显示上面的值，我有一个索引页，其中包含一个用php代码填充的选择框和一个在用户在选择框内选择一个值时用TypeAhead plugin填充的输入文本：
<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta charset="utf-8">
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css">
<!-- jQuery library -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<!-- jQuery UI library -->
<link rel="stylesheet" href="https://ajax.googleapis.com/ajax/libs/jqueryui/1.12.1/themes/smoothness/jquery-ui.css">
<script src="https://ajax.googleapis.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-3-typeahead/4.0.2/bootstrap3-typeahead.min.js"></script>
</head>
<body>
<div class="container">
<br>
<h1>TWITTER DYNAMIC TYPEAHEAD</h1>
<br>
<div class="row">
<?php
// Include the database config file
include_once 'dbConfig.php';
// Fetch all the category data
$query = "SELECT * FROM categories ORDER BY category ASC";
$result = $db->query($query);
?>
<!-- category dropdown -->
<div class="col-md-4">
<select id="categoryFK" name="categoryFK" class="form-control">
<option value="">select category</option>
<?php
if($result->num_rows > 0){
while($row = $result->fetch_assoc()){
echo '<option value="'.$row['categoryID'].'">'.$row['category'].'</option>';
}
}else{
echo '<option value="">Category not available</option>';
}
?>
</select>
</div>
<div class="col-md-4">
<input type="text" name="products" id="products" class="form-control input-lg" autocomplete="off" placeholder="" />
</div>
<div class="col-md-4">
<div> I would like to display image value here after select a value into input text #products dropdownlist </div>
</div>
</div>
</div>
</body>
</html>
并且在将请求发送到php脚本（fetch.php）的Ajax脚本下面：
<script type="text/javascript">
var products;
$ ( function ()
{
$('#categoryFK').on('change', function(){
var queryID = $(this).val();
$.ajax({
url:"fetch.php",
method:"POST",
data: {
category: queryID
},
dataType:"json",
success:function(data)
{
$("#products").val ('');
products = data;
}
});
});
$('#products').typeahead({
source: function ( query, result )
{
result ( $.map(products, function (item)
{
return item;
}
));
}
});
});
</script>
最后是将响应发送到Ajax的php脚本fetch.php：
<?php
include 'dbConfig.php';
if ( isset ( $_POST [ 'category' ] ) ) {
$request = $db->real_escape_string($_POST["category"]);
$query = "
SELECT * FROM products WHERE categoryFK = ".$request."
";
$result = $db->query($query);
$data = array ();
if ( $result->num_rows > 0 )
{
while($row = $result->fetch_assoc ())
{
$data[]=$row["productName"];
}
echo json_encode($data);
}
}
?>
从输入文本＃products下拉列表中选择一个值后，如何改进TypeAhead脚本以在div内显示图像值？
您可以在像这样的jquery ajax进行更改时做到这一点
HTML和jquery示例
$(document).ready(function() {
$("#categoryFK").change(function() {
var src = $(this).val();
$("#result").html(src ? "<img src='path/to/your/image/" + src + ".jpg'>" : "");
});
});<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<select id="categoryFK" name="categoryFK" required>
<option name="cat-1" value="cat-1">cat-1</option>
<option name="cat-2" value="cat-2">cat-2</option>
</select>
<div id="result"></div>