target=“_blank” in h:commandlink not opening page in new tab of browser

问题

My h:commandLink is opening/previewing the pdf document on same page/window when h:commandlink used with target="_blank". I want it to be opened in new tab of the browser

where can be the error?

Preview.xhtml code:

<h:commandLink  id="DocUpoadPreview" action="#{documentController.previewUploadedFile}" value="Preview" target="_blank" >

             </h:commandLink>

In previewuploadedFile() action encription/decryption and some other process with pdf is required that is why necessary to use and that is why not using h:outputlink here. After the action process i want to redirect to another page(previewUploadedDoc.xhtml) which uses primefaces p:media tag to preview the document.

public String previewUploadedFile() throws Exception {


  //decryption process and adding water mark here//
FacesContext.getCurrentInstance().getExternalContext()
        .redirect("previewUploadedDoc.xhtml");}

回答1:

Try it:

<h:commandLink  id="DocUpoadPreview" action="#{documentController.previewUploadedFile}" value="Preview" target="_new" />

回答2:

target="_new" is not valid value of target. It defines _new as a name of new page.

This is the valids values: https://www.w3schools.com/tags/att_a_target.asp

来源：https://stackoverflow.com/questions/14066973/target-blank-in-hcommandlink-not-opening-page-in-new-tab-of-browser