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推荐:PHP+jQuery+Ajax多图片上传的实例

Jun 08, 2016 pm 05:21 PM
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我们在本文中用到一个Ajax表单提交插件:jqery.form.js,有高人修改了几行代码并改名为:jquery.wallform.js,直接拿来用。

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Ajax多图片上传效果界面

推荐:PHP+jQuery+Ajax多图片上传的实例

我们在页面上放置一个form表单,使用post提交到后台php处理程序upload.php,注意enctype属性设置要支持文件上传。#preview用来显示上传完毕后的图片。关于css样式设置本文不加说明,请参照下载包的源码。
 

 代码如下 复制代码

   
   

        添加图片
       
   


最大100KB,支持jpg,gif,png格式。


 

jQuery
本实例基于jQuery,因此必须在页面中载入jquery库以及jquery.wallform.js。
 

当点击按钮“添加图片”后,弹出选择文件对话框,选择要上传的图片后,触发change事件。然后表单#imageform调用jquery.wallform.js的ajaxForm()方法,将表单数据提交给后台PHP处理,并根据返回结果处理页面元素的展示。如果上传成功,图片会一张张排列显示在页面上。关于ajaxForm()的使用可以参照本站文章:Ajax表单提交插件jqery form。
 

 代码如下 复制代码
$(function(){
    $('#photoimg').die('click').live('change', function(){
        var status = $("#up_status");
        var btn = $("#up_btn");
        $("#imageform").ajaxForm({
            target: '#preview', 
            beforeSubmit:function(){
                status.show();
                btn.hide();
            }, 
            success:function(){
                status.hide();
                btn.show();
            }, 
            error:function(){
                status.hide();
                btn.show();
        } }).submit();
    });
});
PHP
upload.php处理图片上传,并将上传好的图片保存在uploads/目录,注意该目录要有写权限。首先需要检测是否为POST方式提交,然后判断图片格式、图片大小是否符合要求,然后使用move_uploaded_file()上传图片,并将图片重命名,格式为:time().rand(100,999)。
 代码如下 复制代码
 
$path = "uploads/";
 
$extArr = array("jpg", "png", "gif");
 
if(isset($_POST) and $_SERVER['REQUEST_METHOD'] == "POST"){
    $name = $_FILES['photoimg']['name'];
    $size = $_FILES['photoimg']['size'];
    
    if(empty($name)){
        echo '请选择要上传的图片';
        exit;
    }
    $ext = extend($name);
    if(!in_array($ext,$extArr)){
        echo '图片格式错误!';
        exit;
    }
    if($size>(100*1024)){
        echo '图片大小不能超过100KB';
        exit;
    }
    $image_name = time().rand(100,999).".".$ext;
    $tmp = $_FILES['photoimg']['tmp_name'];
    if(move_uploaded_file($tmp, $path.$image_name)){
        echo '推荐:PHP+jQuery+Ajax多图片上传的实例';
    }else{
        echo '上传出错了!';
    }
    exit;
}
 
//获取文件类型后缀
function extend($file_name){
    $extend = pathinfo($file_name);
    $extend = strtolower($extend["extension"]);
    return $extend;
}
当然,实际应用中,可以与数据库以及用户中心结合,将用户上传的图片保存在数据表中,具体应用大家可以自行研究。
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