swfupload上传文件数量限制之setStats()

使用swfupload仿赶集的图片上传

 

SWFUpload是一个基于flash与javascript的客户端文件上传组件。

handlers.js文件
完成文件入列队（fileQueued） → 完成选择文件（fileDialogComplete） → 开始上传文件（uploadStart） → 上传处理（uploadProgress） → 上传成功（uploadSuccess） → 上传完成（uploadComplete）  → 列队完成（queueComplete）
如上所示，单选文件顺序执行以上回调函数，需要注意的是选择多个文件，fileQueued、queueComplete只会执行一次，而fileDialogComplet...→ uploadComplete每个文件都执行一次。

 

参考官方例子完成基本功能后，仿赶集采用iframe的方式

为了实现缩略图预览 以及删除 和上传图片个数的限制

显示缩略图，生成删除缩略图的按钮，

thumbImages为父页面显示缩略图的div 

src_s为生成的缩略图地址

src_b为原图地址

serverData是图片上传处理页面返回的数据 成功则以    success|缩略图地址|原图地址   这样的格式返回

 

function uploadSuccess(file, serverData) {
    try {
        var result = serverData.split('|');

        if(result[0] != 'success') {
            var progress = new FileProgress(file, this.customSettings.progressTarget);
            progress.setError();
            progress.setStatus(serverData);
            progress.toggleCancel(false);
        } else {
            var progress = new FileProgress(file, this.customSettings.progressTarget);
            progress.setComplete();
            progress.setStatus("上传完成");
            progress.toggleCancel(false);
            var img_url_s = result[1];
            var img_url_b = result[2];
            addImage(img_url_s,img_url_b);
        }

    } catch (ex) {
        this.debug(ex);
    }
}

function uploadSuccess(file, serverData) {

	try {

		var result = serverData.split('|');

		

		if(result[0] != 'success') {

			var progress = new FileProgress(file, this.customSettings.progressTarget);

			progress.setError();

			progress.setStatus(serverData);

			progress.toggleCancel(false);

		} else {

			var progress = new FileProgress(file, this.customSettings.progressTarget);

			progress.setComplete();

			progress.setStatus("上传完成");

			progress.toggleCancel(false);

			var img_url_s = result[1];

			var img_url_b = result[2];

			addImage(img_url_s,img_url_b);

		}



	} catch (ex) {

		this.debug(ex);

	}

}

 

 

function addImage(src_s,src_b) {
    var newDiv = parent.document.createElement("div");
    newDiv.style.margin = "5px";
    newDiv.style.height = "60px";
    newDiv.style.width = "80px";
    newDiv.style.border = "1px solid #7F9DB9";
    newDiv.style.cssFloat = "left";
    newDiv.style.styleFloat = "left";
    newDiv.style.position = "relative";

    var newA = parent.document.createElement("a");
    newA.className = "delete";
    newA.title = "删除";
    newA.href = "javascript::";
    newA.onclick = function(){delDiv(newDiv);};

    var newInput_s = parent.document.createElement("input");
    newInput_s.type = "hidden";
    newInput_s.value = src_s;
    newInput_s.name = "image_s[]";

    newA.appendChild(newInput_s);

    var newInput_b = parent.document.createElement("input");
    newInput_b.type = "hidden";
    newInput_b.value = src_b;
    newInput_b.name = "image_b[]";

    newA.appendChild(newInput_b);

    var newImgDiv = parent.document.createElement("div");

    var newImg = parent.document.createElement("img");
    newImg.style.height = "60px";
    newImg.style.width = "80px";

    newImgDiv.appendChild(newImg);

    newDiv.appendChild(newImgDiv);
    newDiv.appendChild(newA);
    parent.document.getElementById("thumbImages").appendChild(newDiv);

    if (newImg.filters) {
        try {
            newImg.filters.item("DXImageTransform.Microsoft.Alpha").opacity = 0;
        } catch (e) {
            // If it is not set initially, the browser will throw an error.  This will set it if it is not set yet.
            newImg.style.filter = 'progid:DXImageTransform.Microsoft.Alpha(opacity=' + 0 + ')';
        }
    } else {
        newImg.style.opacity = 0;
    }

    newImg.onload = function () {
        fadeIn(newImg, 0);
    };
    newImg.src = src_s;
}

function fadeIn(element, opacity) {
    var reduceOpacityBy = 5;
    var rate = 30;  // 15 fps


    if (opacity < 100) {
        opacity += reduceOpacityBy;
        if (opacity > 100) {
            opacity = 100;
        }

        if (element.filters) {
            try {
                element.filters.item("DXImageTransform.Microsoft.Alpha").opacity = opacity;
            } catch (e) {
                // If it is not set initially, the browser will throw an error.  This will set it if it is not set yet.
                element.style.filter = 'progid:DXImageTransform.Microsoft.Alpha(opacity=' + opacity + ')';
            }
        } else {
            element.style.opacity = opacity / 100;
        }
    }

    if (opacity < 100) {
        setTimeout(function () {
            fadeIn(element, opacity);
        }, rate);
    }
}

function addImage(src_s,src_b) {

	var newDiv = parent.document.createElement("div");

	newDiv.style.margin = "5px";

	newDiv.style.height = "60px";

	newDiv.style.width = "80px";

	newDiv.style.border = "1px solid #7F9DB9";

	newDiv.style.cssFloat = "left";

	newDiv.style.styleFloat = "left";

	newDiv.style.position = "relative";

	

	var newA = parent.document.createElement("a");

	newA.className = "delete";

	newA.title = "删除";

	newA.href = "javascript::";

	newA.onclick = function(){delDiv(newDiv);};



	var newInput_s = parent.document.createElement("input");

	newInput_s.type = "hidden";

	newInput_s.value = src_s;

	newInput_s.name = "image_s[]";



	newA.appendChild(newInput_s);



	var newInput_b = parent.document.createElement("input");

	newInput_b.type = "hidden";

	newInput_b.value = src_b;

	newInput_b.name = "image_b[]";



	newA.appendChild(newInput_b);

	

	var newImgDiv = parent.document.createElement("div");



	var newImg = parent.document.createElement("img");

	newImg.style.height = "60px";

	newImg.style.width = "80px";



	newImgDiv.appendChild(newImg);



	newDiv.appendChild(newImgDiv);

	newDiv.appendChild(newA);

	parent.document.getElementById("thumbImages").appendChild(newDiv);



	if (newImg.filters) {

		try {

			newImg.filters.item("DXImageTransform.Microsoft.Alpha").opacity = 0;

		} catch (e) {

			// If it is not set initially, the browser will throw an error.  This will set it if it is not set yet.

			newImg.style.filter = 'progid:DXImageTransform.Microsoft.Alpha(opacity=' + 0 + ')';

		}

	} else {

		newImg.style.opacity = 0;

	}



	newImg.onload = function () {

		fadeIn(newImg, 0);

	};

	newImg.src = src_s;

}



function fadeIn(element, opacity) {

	var reduceOpacityBy = 5;

	var rate = 30;	// 15 fps





	if (opacity < 100) {

		opacity += reduceOpacityBy;

		if (opacity > 100) {

			opacity = 100;

		}



		if (element.filters) {

			try {

				element.filters.item("DXImageTransform.Microsoft.Alpha").opacity = opacity;

			} catch (e) {

				// If it is not set initially, the browser will throw an error.  This will set it if it is not set yet.

				element.style.filter = 'progid:DXImageTransform.Microsoft.Alpha(opacity=' + opacity + ')';

			}

		} else {

			element.style.opacity = opacity / 100;

		}

	}



	if (opacity < 100) {

		setTimeout(function () {

			fadeIn(element, opacity);

		}, rate);

	}

}

 

关于剩余可上传文件个数的处理

 

function queueComplete(numFilesUploaded) {
    this.setButtonDisabled(false);
    var stats = this.getStats();
    var status = document.getElementById("divStatus");
    status.innerHTML = "已上传 " + stats.successful_uploads + " 个文件,还可以上传"+ parseInt(this.settings['file_upload_limit']-stats.successful_uploads) +"个文件";
}

function delDiv(mydiv) {
    mydiv.parentNode.removeChild(mydiv);
    //swfu参见iframe页面中的 swfu = new SWFUpload(settings);
    var stats = swfu.getStats();
    stats.successful_uploads--;
    swfu.setStats(stats);
    var status = document.getElementById("divStatus");
    status.innerHTML = "已上传 " + stats.successful_uploads + " 个文件,还可以上传"+ parseInt(swfu.settings['file_upload_limit']-stats.successful_uploads) +"个文件";
}

function queueComplete(numFilesUploaded) {

	this.setButtonDisabled(false);

	var stats = this.getStats();

	var status = document.getElementById("divStatus");

	status.innerHTML = "已上传 " + stats.successful_uploads + " 个文件,还可以上传"+ parseInt(this.settings['file_upload_limit']-stats.successful_uploads) +"个文件";

}



function delDiv(mydiv) {

	mydiv.parentNode.removeChild(mydiv);

	//swfu参见iframe页面中的 swfu = new SWFUpload(settings);

	var stats = swfu.getStats();

	stats.successful_uploads--;

	swfu.setStats(stats);

	var status = document.getElementById("divStatus");

	status.innerHTML = "已上传 " + stats.successful_uploads + " 个文件,还可以上传"+ parseInt(swfu.settings['file_upload_limit']-stats.successful_uploads) +"个文件";

}

可能是由于使用iframe的关系

 

delDiv函数里的swfu不能用this代替

 

整体效果如下图：

 

 

当上传完图片后，再次修改信息时，需要取已经上传了多少个图片，结合到swfupload里

通过php从后台取到已上传的图片路径，通过smarty给到一个js数组里

 

var img_arr = new Array();
{if isset($img_arr)}
{section name='img_arr' loop=$img_arr}
img_arr[{$smarty.section.img_arr.index}] = new Array('{$img_arr[img_arr].images_s}','{$img_arr[img_arr].images_b}');
{/section}
{/if}

var img_arr = new Array();

{if isset($img_arr)}

{section name='img_arr' loop=$img_arr}

img_arr[{$smarty.section.img_arr.index}] = new Array('{$img_arr[img_arr].images_s}','{$img_arr[img_arr].images_b}');

{/section}

{/if}

查询swfupload文档得到如下资料

 

 

flashReady()

 

该事件函数是内部事件，因此不能被重写。当SWFupload实例化，加载的FLASH完成所有初始化操作时触发此事件。

提醒：对应设置中的自定义事件swfupload_loaded_handler

于是通过swfupload的settings里设置 swfupload_loaded_handler

 

swfupload_loaded_handler : loaded,

swfupload_loaded_handler : loaded,

再在handlers.js定义loaded函数

 

 

function loaded() {
    if(img_arr.length != 0) {
        for( val in img_arr ) {
            addImageFromDb(img_arr[val][0],img_arr[val][1],this);
        }
    }
}

function loaded() {

	if(img_arr.length != 0) {

		for( val in img_arr ) {

			addImageFromDb(img_arr[val][0],img_arr[val][1],this);

		}

	}

}

 

 

调用addImageFromDb函数 修改已上传的图片数量 并且生成已上传的图片的缩略图

 

//初始化已经上传过的图片
function addImageFromDb(src_s,src_b,swfu) {

    var stats = swfu.getStats();
    stats.successful_uploads++;
    swfu.setStats(stats);
    var status = document.getElementById("divStatus");
    status.innerHTML = "已上传<font color='green'>" + stats.successful_uploads + "</font>张,还可以上传<font color='red'>"+ parseInt(swfu.settings['file_upload_limit']-stats.successful_uploads) +"</font>张";

    addImage(src_s,src_b);
}

//初始化已经上传过的图片

function addImageFromDb(src_s,src_b,swfu) {

	

	var stats = swfu.getStats();

	stats.successful_uploads++;

	swfu.setStats(stats);

	var status = document.getElementById("divStatus");

	status.innerHTML = "已上传<font color='green'>" + stats.successful_uploads + "</font>张,还可以上传<font color='red'>"+ parseInt(swfu.settings['file_upload_limit']-stats.successful_uploads) +"</font>张";



	addImage(src_s,src_b);

}

 

 

参考文档：http://leeon.me/upload/other/swfupload.html

                    http://hi.baidu.com/e_polo/blog/item/232745182e3dbbb84aedbcf7.html

                    http://addcn.blogbus.com/logs/157496180.html