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jquery cooperates with .NET to realize click-to-specify binding data and can download it with one click
jquery cooperates with .NET to realize click-to-specify binding data and can download it with one click
Dec 08, 2016 pm 02:14 PM
You need to click on the bound data to download the specified attachments and download them in batches (the bound data is not datagrid, background splicing binding).
The rendering is as follows:
The general idea:
1.jquery gets the id of the selected bound data, assigns this id to an array, and finally assigns the value of this array to the hidden object created on the page Variable
2. Get the value of the hidden variable in the background, loop it through the array, get the download address of the bound value, and finally package and download it
Firstly, the div in the html is bound according to the background
<div id="downloadInfo" runat="server"></div>
Secondly It is the option to download attachments. It is implemented using jquery and assigns the value to the hidden variable in the page. The code is as follows:
// 下載附件的選擇
$attach = $("#download-list");
var arr = []
$attach.on('click', '.no', function () {
$(this).toggleClass('checked');//設(shè)置和移除，選中與不選中
if ($(this).hasClass('checked')) {
var guid = $(this).children("#hidAttachGuid").val();
arr.push(guid);//將guid添加到arr數(shù)組中
}
else
{//取消選中時
var guid = $(this).children("#hidAttachGuid").val();
var n = arr.indexOf(guid);
if (n != -1)
arr.splice(n, 1);//將指定不選中的guid移除arr數(shù)組
}
$("[id$='arrayGuid']").val(arr);
});
Because it is spliced ??in the background, the button is also spliced ??in the background, and the background button calls js
<button type='button' class='one-download' onclick='download()'>一鍵下載</button>
function download() {
$("#btnDownload").click();
}
js triggers hidden button event
<span style="display: none">
<asp:Button ID="btnDownload" OnClick="btnDownload_Click" Text="確定" runat="server" />
<input type="text" id="arrayGuid" runat="server" />
</span>
Backend one-click package download code:
protected void btnDownload_Click(object sender, EventArgs e)
{
//ZipFileByCode();
string attachGuid = arrayGuid.Value;
string[] sArray = attachGuid.Split(',');
List<string> list = new List<string>();
foreach (string i in sArray)
{
//這里是循環(huán)得到指定需要下載的所有id
}
Download(list, ""+lblCourseName.Text+"相關(guān)附件材料.rar");
}
public void ZipFileByCode()
{
MemoryStream ms = new MemoryStream();
byte[] buffer = null;
using (ZipFile file = ZipFile.Create(ms))
{
file.BeginUpdate();
file.NameTransform = new MyNameTransfom();//通過這個名稱格式化器，可以將里面的文件名進(jìn)行一些處理。默認(rèn)情況下，會自動根據(jù)文件的路徑在zip中創(chuàng)建有關(guān)的文件夾。
file.Add(Server.MapPath("/Content/images/img01.jpg"));
file.CommitUpdate();
buffer = new byte[ms.Length];
ms.Position = 0;
ms.Read(buffer, 0, buffer.Length);
}
Response.AddHeader("content-disposition", "attachment;filename=test.zip");
Response.BinaryWrite(buffer);
Response.Flush();
Response.End();
}
Same layer code as pageload
private void Download(IEnumerable<string> files, string zipFileName)
{
//根據(jù)所選文件打包下載
MemoryStream ms = new MemoryStream();
byte[] buffer = null;
using (ZipFile file = ZipFile.Create(ms))
{
file.BeginUpdate();
file.NameTransform = new MyNameTransfom();//通過這個名稱格式化器，可以將里面的文件名進(jìn)行一些處理。默認(rèn)情況下，會自動根據(jù)文件的路徑在zip中創(chuàng)建有關(guān)的文件夾。
foreach (var item in files)
{
file.Add(item);
}
//file.Add(Server.MapPath("../../BigFileUpLoadStorage/1.png"));
file.CommitUpdate();
buffer = new byte[ms.Length];
ms.Position = 0;
ms.Read(buffer, 0, buffer.Length);
}
Response.AddHeader("content-disposition", "attachment;filename=" + zipFileName);
Response.BinaryWrite(buffer);
Response.Flush();
Response.End();
}
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