使用ajax在codeigniter中上载带有图像的表单

我是codeigniter的新手，正在尝试上载带有

文件
字段的
表单。我成功地将没有
文件的表单数据插入数据库。但当我尝试使用文件字段时，它显示以下错误

`<p>You did not select a file to upload.</p>`

form_actions.php

我认为必须在较新的浏览器上使用
FormData（）
类才能使其正常工作。看到这个答案了吗

或者使用与此类似的第三方插件，您可以使用以下代码

 $(document).ready(function() { 
        // bind 'myForm' and provide a simple callback function 
        $('#add_author_form).ajaxForm(function() { 
            alert("Thank you for your comment!"); 
        }); 
    }); 

我希望这对您有所帮助
我使用
上载库在
codeigniter
中执行了以下上载图像的功能

通过使用此功能，我可以添加单个/多个文件

function add_image ( $path, $field ) //upload and the file field name
{
    $config = array (
        'upload_path' => $path,
        'allowed_types' => 'gif|jpg|jpeg|png',
        'max_size' => '1024',
        'max_width' => '1024',
        'max_height' => '1024',
        'encrypt_name' => TRUE
    );
    $this->load->library ( 'upload', $config ); //load codeigniter libraries
    $name_array = array ();
    $count = count ( $_FILES[ $field ][ 'size' ] );
    if ( count ( $_FILES[ $field ] ) == count ( $_FILES[ $field ], COUNT_RECURSIVE ) ) //if only one image is present
    {
        if ( !$this->upload->do_upload ( $field ) )
        {
            return FALSE;
        }
        $data = $this->upload->data ();
        return $data[ 'file_name' ]; //return the uploaded file name
    }
    else //if multiple images selected
    {
        foreach ( $_FILES as $key => $value )
        {
            for ( $s = 0; $s < $count; $s++ )
            {
                $_FILES[ 'userfile' ][ 'name' ] = $value[ 'name' ][ $s ];
                $_FILES[ 'userfile' ][ 'type' ] = $value[ 'type' ][ $s ];
                $_FILES[ 'userfile' ][ 'tmp_name' ] = $value[ 'tmp_name' ][ $s ];
                $_FILES[ 'userfile' ][ 'error' ] = $value[ 'error' ][ $s ];
                $_FILES[ 'userfile' ][ 'size' ] = $value[ 'size' ][ $s ];
                if ( $this->upload->do_upload () )
                {
                    $data = $this->upload->data ();
                    $name_array[ ] = $data[ 'file_name' ];
                }
                else
                {
                    return FALSE;
                }
            }
            return $name_array;//return the names of images uploaded
        }
    }
}

函数add_image（$path，$field）//上传和文件字段名
{
$config=array(
“上传路径”=>$path，
“允许的_类型”=>“gif | jpg | jpeg | png”，
“最大大小”=>“1024”，
“最大宽度”=>“1024”，
“最大高度”=>“1024”，
“encrypt_name”=>TRUE
);
$this->load->library（'upload'，$config）；//加载codeigniter库
$name_array=array（）；
$count=count（$_文件[$field]['size']）；
if（count（$\u FILES[$field]）==count（$\u FILES[$field]，count\u RECURSIVE））//如果只存在一个图像
{
如果（！$this->upload->do_upload（$field））
{
返回FALSE；
}
$data=$this->upload->data（）；
return$data['file_name']；//返回上传的文件名
}
else//如果选择了多个图像
{
foreach（$\文件为$key=>$value）
{
对于（$s=0；$s<$count；$s++）
{
$\u文件['userfile']['name']=$value['name'][$s]；
$\u文件['userfile']['type']=$value['type'][$s]；
$\u FILES['userfile']['tmp\u name']=$value['tmp\u name'][$s]；
$\u文件['userfile']['error']=$value['error'][$s]；
$\u文件['userfile']['size']=$value['size'][$s]；
如果（$this->upload->do_upload（））
{
$data=$this->upload->data（）；
$name_数组[]=$data['file_name']；
}
其他的
{
返回FALSE；
}
}
return$name_array；//返回上传图像的名称
}
}
}

public function add_author ()
{
    $this -> load -> helper ( 'form' );
    $config = array (
        'upload_path' => './images/author/',
        'allowed_types' => 'gif|jpg|jpeg|png',
        'max_size' => '2000',
        'max_width' => '2000',
        'max_height' => '2000',
        'encrypt_name' => true,
    );

    $this -> load -> library ( 'upload', $config );

    if ( ! $this -> upload -> do_upload ( 'author_image' ) )
    {
        echo $error = $this -> upload -> display_errors ();
    }
    else
    {
        echo $data = $this -> upload -> data ();
    }
}

 $(document).ready(function() { 
        // bind 'myForm' and provide a simple callback function 
        $('#add_author_form).ajaxForm(function() { 
            alert("Thank you for your comment!"); 
        }); 
    }); 

function add_image ( $path, $field ) //upload and the file field name
{
    $config = array (
        'upload_path' => $path,
        'allowed_types' => 'gif|jpg|jpeg|png',
        'max_size' => '1024',
        'max_width' => '1024',
        'max_height' => '1024',
        'encrypt_name' => TRUE
    );
    $this->load->library ( 'upload', $config ); //load codeigniter libraries
    $name_array = array ();
    $count = count ( $_FILES[ $field ][ 'size' ] );
    if ( count ( $_FILES[ $field ] ) == count ( $_FILES[ $field ], COUNT_RECURSIVE ) ) //if only one image is present
    {
        if ( !$this->upload->do_upload ( $field ) )
        {
            return FALSE;
        }
        $data = $this->upload->data ();
        return $data[ 'file_name' ]; //return the uploaded file name
    }
    else //if multiple images selected
    {
        foreach ( $_FILES as $key => $value )
        {
            for ( $s = 0; $s < $count; $s++ )
            {
                $_FILES[ 'userfile' ][ 'name' ] = $value[ 'name' ][ $s ];
                $_FILES[ 'userfile' ][ 'type' ] = $value[ 'type' ][ $s ];
                $_FILES[ 'userfile' ][ 'tmp_name' ] = $value[ 'tmp_name' ][ $s ];
                $_FILES[ 'userfile' ][ 'error' ] = $value[ 'error' ][ $s ];
                $_FILES[ 'userfile' ][ 'size' ] = $value[ 'size' ][ $s ];
                if ( $this->upload->do_upload () )
                {
                    $data = $this->upload->data ();
                    $name_array[ ] = $data[ 'file_name' ];
                }
                else
                {
                    return FALSE;
                }
            }
            return $name_array;//return the names of images uploaded
        }
    }
}