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

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