文件上传不起作用？

Question

这是我使用的代码，因此我可以上传图片而无需离开页面，我可以在上传后显示。

一切正常，直到$（'＃uploadImage'）。更改功能但文件没有上传。

    

    <script> 

function o()
{
      $('#ajax').show();
}


$(function(){

$('#drop a').click(function(){
    // Simulate a click on the file input button
    // to show the file browser dialog
    $(this).parent().find('input#uploadImage').click();
    o();

}); 

$('#uploadImage').change(function(e){
// do something after a file is selected
// maybe submit the file?

 e.target.form.submit();
      $('#myForm').ajaxForm(function(result) { 

                    $('#ajax').hide();
                    $('#view').html(result);
                }); 
});




});

<div id="upload1" style="float:left;margin-top:0px;margin-left:200px;">
<div id="drop">

                <div id="ajax" style="display:none" ><img src="ajax-loader.gif"></div>
                 <div id="view"></div>

            </div>
    </div>  

<div>
    <form id="myForm" method="post" action="upload.php" enctype="multipart/form-data">
        <div id="drop">
            <a>Browse</a>
            <input id="uploadImage" type="file" accept="image/jpeg" name="image" />
        </div>

    </form>

PHP代码

    <?php
    $valid_exts = array('jpeg', 'jpg', 'png', 'gif');
    $max_file_size = 1024 * 1024; #200kb
    $nw = $nh = 200; # image with # height

    if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    if ( isset($_FILES['image']) ) {
        if (! $_FILES['image']['error'] && $_FILES['image']['size'] < $max_file_size) {
            $ext = strtolower(pathinfo($_FILES['image']['name'], PATHINFO_EXTENSION));
            if (in_array($ext, $valid_exts)) {
                    $path = 'uploads/' . uniqid() . '.' . $ext;
                    $size = getimagesize($_FILES['image']['tmp_name']);

                    $w = (int) $size[0];
                    $h = (int) $size[1];

                    $data = file_get_contents($_FILES['image']['tmp_name']);
                    $vImg = imagecreatefromstring($data);
                    $dstImg = imagecreatetruecolor($nw, $nh);
                    imagecopyresampled($dstImg, $vImg, 0, 0, 0, 0, $nw, $nh, $w, $h);
                    imagejpeg($dstImg, $path);
                    imagedestroy($dstImg);
                    echo "<img src='$path' />";

                } else {
                    echo 'unknown problem!';
                } 
        } else {
            echo 'file is too small or large';
        }
    } else {
        echo 'file not set';
    }
} else {
    echo 'bad request!';
}

?>