[英]How to dynamically change content with php ajax and mysql
I have created a page that populates a sidebar with links(categories) using a database table. 我创建了一个页面,该页面使用数据库表使用链接(类别)填充侧栏。 The table contains names(names of the categories) and their ids.
该表包含名称(类别名称)及其ID。
e.g
| **id** |**name**|
| 1 | Men |
| 2 | Women |
I need to do the following things: 我需要做以下事情:
A div tag, that displays product images below the h1 tag, also changes. 在h1标签下方显示产品图片的div标签也会更改。 I have created a table to hold product data.
我创建了一个表来保存产品数据。 It contains the following data fields:
它包含以下数据字段:
**id**(id for the product)-INT[PRIMARY KEY] **category_id**(category id)-INT[FOREIGN KEY] **name**(product name)-VARCHAR **image**(image file name eg "blu_dress.png" ) eg | **id** |**categoty_id**| **name** | **image** | | 1 | 2 |black blouse |bla_blouse.png| | 2 | 2 | blue dress | blu_dress.png| | 3 | 1 | brown shirt | bro_shirt.png| | 4 | 2 | blue blouse |blu_blouse.png|
PHP CODE TO POPULATE SIDEBAR PHP代码可增加边栏
<?php
$dynamicList = "";
$sql = mysql_query("SELECT * FROM categories ORDER BY id ASC");
$productCount = mysql_num_rows($sql); // count the output amount
if ($productCount > 0)
{
while($row = mysql_fetch_array($sql)){
$id = $row["id"];
$category_name = $row["name"];
$sql2 = mysql_query("SELECT * FROM categories WHERE id='".$id."'");
$dynamicList .= '
<li id="categegoryLink">
<a href="category.php?ID="'$category_name.'"" onclick="">
'.$category_name.'
</a>
</li>
';
}
}
else
{
$dynamicList = "We have no categories listed in our store yet";
}
mysql_close();
?>
AJAX CODE AJAX代码
<script>
function loadXMLDoc()
{
var xmlhttp;
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
document.getElementById("title").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("GET","category.php",true);
xmlhttp.send();
}
</script>
category.php category.php
<?php echo $category_id?>
FURTHER INFO I can't post images since I don't have the reputation but I have an image that explains what I need further, if you need it. 更多信息因为我没有声誉,所以我无法发布图片,但是如果您需要,我有一张可以进一步说明我需要的图片。
I'll recommend using jQuery
and for database use PDO
instead of using mysql
. 我建议使用
jQuery
,对于数据库,请使用PDO
而不是mysql
。 The populated sidebar data is displayed as a list. 填充的侧边栏数据显示为列表。
$options = array(PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION);
$db = new PDO('mysql:host=localhost;dbname=data','root', 'passwd', $options);
$sql = $db->query("SELECT * FROM categories ORDER BY id ASC"); // you can also use prepared statement.
// displaying categories
<ul id="category">
<?php foreach ($sql as $category) : ?>
<li data-id="<?php echo $category['category_id']; ?>"><?php echo $category['name']; ?></li>
<?php endforeach; ?>
</ul>
<div id="results"></div>
And in your jQuery
check for the clicked list item 然后在您的
jQuery
检查单击的列表项
$("#category li").click(function() {
var id = $(this).data('id');
$.post('get.php',{category_id:id},function(data){
$('#results').html(data);
});
});
the code for the get.php
file get.php
文件的代码
<?php
$options = array(PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION);
$db = new PDO('mysql:host=localhost;dbname=data','root', 'passwd', $options);
$sql = $db->query("SELECT * FROM categories ORDER BY id ASC"); // you can also use prepared statement.
if(isset($_POST['category_id'])){
$id = $_POST['id'];
$category = $db-query("SELECT * FROM categories WHERE id = $id");
}
?>
<h1><?php echo $category['name']; ?></h1>
<!--display the results of the query here-->
Here when the user clicks any of the list items jQuery
will get the value of the data-id
attribute 0f which is the id of the category, post this value to get.php
file and select data from the database based on id of the category. 在这里,当用户单击任何列表项时,
jQuery
将获得data-id
属性0f的值(即类别的ID),将该值发布到get.php
文件,然后根据类别的ID从数据库中选择数据。 And return results form the database. 并从数据库返回结果。 The returned data is appended to the div with id
results
. 返回的数据将附加到具有id
results
的div上。
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