如何使用AJAX对选择选项进行PHP查询?
好的,我知道这已经得到了回答(使用Ajax或JavaScript选择下拉列表选项后,在同一页面上执行PHP脚本),但是对于以前从未使用过AJAX的人来说,答案并不是很有帮助。如果有人从下拉列表中选择一个选项,如何运行类似创建的查询?
<head> <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
</head>
<h3>Subject</h3>
<select name="allbooks" >
<option value="none" ></option>
<option value="allbooks" >All Books</option>
</select>
<?php
$query = "SELECT * FROM books" or die("Error in the consult.." . mysqli_error($connection));
$books = $connection->query($query);
?>
回答:
首先,您必须使用Javascript触发AJAX请求。但是,我将通过使用jQuery(一个Javascript库)指导您。
您的HTML:
<select name="allbooks" id="allbooks"> <option value="none" ></option>
<option value="allbooks" >All Books</option>
</select>
<div id="show">
<!-- ITEMS TO BE DISPLAYED HERE -->
</div>
之后,下载jQuery。
然后执行脚本:
<script src="jquery-1.9.1.min.js"></script> <!-- CHANGE THE JQUERY FILE DEPENDING ON THE VERSION YOU HAVE DOWNLOADED --><script type="text/javascript">
$(document).ready(function(){ /* PREPARE THE SCRIPT */
$("#allbooks").change(function(){ /* WHEN YOU CHANGE AND SELECT FROM THE SELECT FIELD */
var allbooks = $(this).val(); /* GET THE VALUE OF THE SELECTED DATA */
var dataString = "allbooks="+allbooks; /* STORE THAT TO A DATA STRING */
$.ajax({ /* THEN THE AJAX CALL */
type: "POST", /* TYPE OF METHOD TO USE TO PASS THE DATA */
url: "get-data.php", /* PAGE WHERE WE WILL PASS THE DATA */
data: dataString, /* THE DATA WE WILL BE PASSING */
success: function(result){ /* GET THE TO BE RETURNED DATA */
$("#show").html(result); /* THE RETURNED DATA WILL BE SHOWN IN THIS DIV */
}
});
});
});
</script>
然后让我们创建get-data.php
,它将接收通过AJAX发送的数据。
if(!empty($_POST["allbooks"])){ /* DO YOUR QUERY HERE AND GET THE OUTPUT YOU WANT */
echo $output; /* PRINT THE OUTPUT YOU WANT, IT WILL BE RETURNED TO THE ORIGINAL PAGE */
}
您可以查看此示例JSfiddle。
以上是 如何使用AJAX对选择选项进行PHP查询? 的全部内容, 来源链接: utcz.com/qa/398299.html