在我们的网站中,我们嵌入了PDF文件,并且希望确保当用户点击PDF内的链接时,它会在新标签页或窗口中打开。由于我们无法控制PDF文件本身,因此无法对链接进行任何更改。
是否有可能通过某种方式拦截请求,例如使用onbeforeunload,在新窗口中强制打开页面呢?
是否有可能通过某种方式拦截请求,例如使用onbeforeunload,在新窗口中强制打开页面呢?
根据Aaron Digulla的回答, 你不能在不修改PDF阅读器的情况下实现这一点。抱歉!
我认为你不能在不改变Acrobat Reader的情况下做到这一点...我建议使用一些不使用“单个文档”UI的其他PDF阅读器。[Foxit Reader]使用选项卡可以显示多个PDF文档。
public static MemoryStream OpenLinksInNewWindow(MemoryStream mySource)
{
PdfReader myReader = new PdfReader(mySource);
int intPageCount = myReader.NumberOfPages;
PdfDictionary myPageDictionary = default(PdfDictionary);
PdfArray myLinks = default(PdfArray);
//Loop through each page
for (int i = 1; i <= intPageCount; i++)
{
//Get the current page
myPageDictionary = myReader.GetPageN(i);
//Get all of the annotations for the current page
myLinks = myPageDictionary.GetAsArray(PdfName.ANNOTS);
//Make sure we have something
if ((myLinks == null) || (myLinks.Length == 0))
continue;
//Loop through each annotation
foreach (PdfObject myLink in myLinks.ArrayList)
{
//Convert the itext-specific object as a generic PDF object
PdfDictionary myLinkDictionary = (PdfDictionary)PdfReader.GetPdfObject(myLink);
//Make sure this annotation has a link
if (!myLinkDictionary.Get(PdfName.SUBTYPE).Equals(PdfName.LINK))
continue;
//Make sure this annotation has an ACTION
if (myLinkDictionary.Get(PdfName.A) == null)
continue;
//Get the ACTION for the current annotation
PdfDictionary myLinkAction = (PdfDictionary)myLinkDictionary.Get(PdfName.A);
//Test if it is a URI action
if (myLinkAction.Get(PdfName.S).Equals(PdfName.URI))
{
//Replace the link to run a javascript function instead
myLinkAction.Remove(PdfName.F);
myLinkAction.Remove(PdfName.WIN);
myLinkAction.Put(PdfName.S, PdfName.JAVASCRIPT);
myLinkAction.Put(PdfName.JS, new PdfString(String.Format("OpenLink('{0}');", myLinkAction.Get(PdfName.URI))));
}
}
}
//Next we create a new document add import each page from the reader above
MemoryStream myMemoryStream = new MemoryStream();
using (Document myDocument = new Document())
{
using (PdfCopy myWriter = new PdfCopy(myDocument, myMemoryStream))
{
myDocument.Open();
for (int i = 1; i <= myReader.NumberOfPages; i++)
{
myWriter.AddPage(myWriter.GetImportedPage(myReader, i));
}
// Insert JavaScript function to open link
string jsText = "function OpenLink(uri) { app.launchURL(uri, true); }";
PdfAction js = PdfAction.JavaScript(jsText, myWriter);
myWriter.AddJavaScript(js);
myDocument.Close();
}
}
return new MemoryStream(myMemoryStream.GetBuffer());
}
我从这篇答案中得到了大部分代码:https://dev59.com/PGsz5IYBdhLWcg3wDjto#8141831
这个链接JS to open pdf's in new window是否对您有用?我假设您至少可以在页面上添加JavaScript。您不必修改PDF本身以便在新窗口中打开它们,即使您可能无法修改URL本身,您也应该可以自由地在页面上以任何方式打开这些链接。或者我完全误解了您的问题? :)