我使用的是asp文件上傳者對此我上傳按鈕上的圖像點擊。每當我正在上傳超過4 MB的圖像崩潰。如果我在配置定義大小的maxRequestLength 然後,如果我超過了文件大小它再次crashes.Is可以限制用戶,並顯示一個免責聲明郵件,如果一個巨大的文件上傳。我的意圖是讓用戶知道該文件是巨大的。在使用asp文件上傳4 MB Uplaod形象?
aspx頁面
<tr>
<td align="center" class="title" colspan="2">
Image Upload
</td>
</tr>
<tr>
<td align="center" colspan="2">
<asp:Label ID="lblImageDisclaimer" runat="server" Text="Please upload an image file less than 3MB in size"
Font-Bold="true" ForeColor="Highlight"></asp:Label>
</td>
</tr>
<tr>
<td align="center" colspan="2">
<asp:DropDownList ID="ddlImageType" runat="server" AutoPostBack="false" OnSelectedIndexChanged="ddlImageType_SelectedIndexChanged">
</asp:DropDownList>
</td>
</tr>
<tr>
<td align="center" colspan="2" id="tdUpload" runat="server">
<asp:Label ID="lblImage1" runat="server" Text="Upload images : " Font-Bold="true"></asp:Label>
<asp:FileUpload ID="fileUploader" runat="server" /><asp:Button ID="btnUpload" CssClass="button"
runat="server" Text="Upload" OnClick="btnUpload_Click" OnClientClick="javascript:return validateFile();" />
<asp:Label ID="lblMessage" runat="server" Text="" CssClass="errorText"></asp:Label>
</td>
</tr>
<tr>
<td id="Td2" runat="server" align="center" colspan="1">
<asp:Label ID="Label1" runat="server" Text="SCREENSHOT 1" Font-Bold="true"></asp:Label>
</td>
<td id="Td3" runat="server" align="center" colspan="1">
<asp:Label ID="Label2" runat="server" Text="SCREENSHOT 2" Font-Bold="true"></asp:Label>
</td>
</tr>
<tr>
<td id="imgHolder" runat="server" align="center" colspan="1">
<div style="border: SOLID 1px BLACK; width: 575px; height: 250px; overflow: auto;">
<%--<asp:Image ID="imgPreview" runat="server" ImageUrl="~/FIRE/ImageHandler.ashx?id=1&imageNo=2" />--%>
<asp:Image ID="imgPreview" runat="server" />
</div>
</td>
<td id="imgHolder2" runat="server" align="center" colspan="1">
<div style="border: SOLID 1px BLACK; width: 575px; height: 250px; overflow: auto;">
<%--<asp:Image ID="imgPreview" runat="server" ImageUrl="~/FIRE/ImageHandler.ashx?id=1&imageNo=2" />--%>
<asp:Image ID="imgPreview2" runat="server" />
</div>
</td>
</tr>
<tr>
<td id="tdDelete1" align="left" style="width: 100%; padding-left: 15px;" colspan="1">
<asp:Button ID="btnDelete1" runat="server" Text="Delete" CssClass="button" OnClick="btnDelete_Click"
ToolTip="Click to Delete" OnClientClick="javascript:return confirm('Are you sure you want to delete this image?');" />
</td>
<td id="tdDelete2" align="left" style="width: 100%" colspan="1">
<asp:Button ID="btnDelete2" runat="server" Text="Delete" CssClass="button" OnClick="btnDelete_Click"
ToolTip="Click to Delete" OnClientClick="javascript:return confirm('Are you sure you want to delete this image?');" />
</td>
</tr>
的.cs頁面事件。 protected void btnUpload_Click(object sender,EventArgs e) { try {0} {hfCurrentId.Value = 如果(fileUploader.HasFile) { 如果(fileUploader.PostedFile.ContentType.Contains( 「圖像」)& & fileUploader.PostedFile.ContentLength < = 3145728) {
if (ddlImageType.SelectedValue == "1")
{
Session["FileBytes"] = fileUploader.FileBytes;
hfImage1Byte.Value = Convert.ToBase64String(fileUploader.FileBytes);
imgPreview.ImageUrl = "~/Handlers/ImageHandler.ashx?workItemId=" + workItemId
+ "&imageTypeId=" + ddlImageType.SelectedValue;
}
else
{
Session["FileBytes2"] = fileUploader.FileBytes;
hfImage2Byte.Value = Convert.ToBase64String(fileUploader.FileBytes);
imgPreview2.ImageUrl = "~/Handlers/ImageHandler.ashx?workItemId=" + workItemId
+ "&imageTypeId=" + ddlImageType.SelectedValue;
}
}
else
{
lblMessage.Text = Constants.ImageFileError;
}
}
else
{
lblMessage.Text = Constants.FileError;
}
//lblHeader.Text = hfCurrentId.Value;
//upPanel1.Update();
}
catch (System.Exception ex)
{
//DisplayError(ex);
Session["ExceptionDetails"] = ex;
Response.Redirect(Constants.FIREErrorDetails);
}
}
我在這裏限制了由3145728 大小和處理它在客戶端大小
function validateFile() {
var strFileName = document.getElementById('<%=fileUploader.ClientID %>').value;
var strExtName = strFileName.substring(strFileName.lastIndexOf('.')).toLowerCase();
var objFSO = new ActiveXObject("Scripting.FileSystemObject");
var e = objFSO.getFile(strFileName);
var fileSize = e.size;
//file size limit for 3mb
if (fileSize > 3145728) {
alert("Maximum size of uploaded file should be less than 3 MB.");
return false;
}
else
return true;
}
有沒有其他的方式,以避免
var objFSO = new ActiveXObject("Scripting.FileSystemObject");
我不能使用的ActiveXObject按照某些客戶問題
我可以使用AjaxFileUploader嗎? –
如果您專門針對HTML5瀏覽器,那麼是的,您可以在使用「HTML5 File API」上傳文件之前獲取文件大小,但是如果您有任何用戶使用基於HTML4的瀏覽器,則會從窗口中刪除。如果您閱讀ASP.NET AJAX AjaxFileUploader的文檔,它會說它需要HTML5來獲取進度反饋;否則會顯示一個微調。所以它真的歸結爲HTML5或不; HTML5提供了許多可能性,但要注意並非所有IE版本都支持所有的HTML5功能;請查看[我可以使用](http://caniuse.com/)網站。 –