如何在下面的示例中删除数据库行？

Question

我有一个取消按钮，用户可以在其中取消文件上传，它会显示取消消息。现在我还想发生的是，当用户单击“取消”按钮时，它将在数据库中查找已取消的文件名并删除数据库行。问题是它根本没有删除数据库行。我怎样才能做到这一点。目前我正在使用 jpuery.ajax 方法，您可以在下面的代码中看到。

下面是表格代码：

var $fileImage = $("<form action='imageupload.php' method='post' enctype='multipart/form-data' target='upload_target' onsubmit='return imageClickHandler(this);' class='imageuploadform' >" + 

 "Image File: <input name='fileImage' type='file' class='fileImage' /></label><br/><br/><label class='imagelbl'>" + 

 "<input type='submit' name='submitImageBtn' class='sbtnimage' value='Upload' /></label>" + 

 "</p><p class='imagef1_cancel' align='center'><label>" + 

 "<input type='button' name='imageCancel' class='imageCancel' cancel_image_file_name='" + imagefilename + "' value='Cancel' /></label></form>"); 

下面是取消按钮功能：

    $('.imagef1_cancel').eq(window.lastUploadImageIndex).find(".imageCancel").on("click", function(event) {

        var cancel_image_file_name = $(this).attr('cancel_image_file_name');

    jQuery.ajax("cancelimage.php?imagefilename=" + cancel_image_file_name)

    return stopImageUpload(2, cancel_image_file_name);

});

最后是 jquery.ajax 导航到的 cancelimage.php 脚本，据说可以删除包含文件名的数据库行：

 <?php

...

    //I have connected to database

    $cancel_image_file_name = $_GET["imagefilename"];

            $imagecancelsql = "DELETE FROM Image 
            WHERE ImageFile = 'ImageFiles/". mysql_real_escape_string($cancel_image_file_name)."'";

        mysql_query($imagecancelsql);

        mysql_close();


    ?>

更新：

以下是我回显删除查询时当前显示的内容：

注意：未定义的索引：第 19 行 /web/stud/xxx/.../cancelimage.php 中的图像文件名 从图像中删除 ImageFile = 'ImageFiles/'

以下是删除函数的代码，当按下删除按钮时，它将导航到 deleteimage.php 脚本并删除数据库行：

function stopImageUpload(success, imagefilename){

         $('.listImage').eq(window.lastUploadImageIndex).append('<div>' + htmlEncode(imagefilename) + '<button type="button" class="deletefileimage" image_file_name="' + imagefilename + '">Remove</button><br/><hr/></div>'); 

$('.listImage').eq(window.lastUploadImageIndex).find(".deletefileimage").on("click", function(event) {
    var image_file_name = $(this).attr('image_file_name');

    jQuery.ajax("deleteimage.php?imagefilename=" + image_file_name)

    $(this).parent().remove();
});

      return true;   
}

下面是deleteimage.php脚本：

<?php

//connected to DB

  $image_file_name = $_GET["imagefilename"];

        $imagedeletesql = "DELETE FROM Image 
        WHERE ImageFile = 'ImageFiles/". mysql_real_escape_string($image_file_name)."'";

    mysql_query($imagedeletesql);

    mysql_close();


?>

下面是取消按钮功能的更新：

function startImageUpload(imageuploadform, imagefilename){
            $('.imagef1_cancel').eq(window.lastUploadImageIndex).find(".imageCancel").on("click", function(event) {

var cancel_image_file_name_ = $(this).attr('css');
var cancel_image_file_name = '';
var style_array = cancel_image_file_name_.split(" ");
for(i=0;i<style_array.length;i++){
    if(style_array[i].substr(0,2) == "__"){
     cancel_image_file_name = style_array[i].slice(2,style_array[i].length-2);
}

}

    jQuery.ajax("cancelimage.php?imagefilename=" + cancel_image_file_name)

    return stopImageUpload(2, cancel_image_file_name);

});       
      return true;
}

我将按钮输入标记更改为取消按钮：

<input type='button' name='imageCancel' class='imageCancel __"+ imagefilename + "' value='Cancel' />

Answer 1

试试这些改变：

在表格上：

<input type='button' name='imageCancel' class='imageCancel __"+ imagefilename + "' value='Cancel' /></label></form>

关于取消按钮功能：

var cancel_image_file_name_ = $(this).attr('class');
var cancel_image_file_name = '';
var style_array = cancel_image_file_name_.split(" ");
for(i=0;i<style_array.length;i++){
    if(style_array[i].substr(0,2) == "__"){
     cancel_image_file_name = style_array[i].slice(2,style_array[i].length);
}

}