利用form的target属性屏蔽url跳转

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target:

规定在何处打开 action URL。

关键点:

让target指向隐藏的iframe

demo:

form.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title><script type="text/javascript">function doSave(){var param = "?method=add";testForm.action='handler.jsp' + param ;testForm.submit();}</script></head><body><form id="testForm" name="testForm" method="post" target="sub_frame">id:<input type="text" name="id"><input type="button" value="提交" onclick="doSave();"><iframe id="sub_frame" name="sub_frame" height="0" width="0" frameborder="0" marginheight="0" marginwidth="0" ></iframe></form><br/>id值:<input id="content" name="content" type="text"></body></html>

handler.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><%String method=request.getParameter("method");if("add".equals(method)){String id =request.getParameter("id");out.println("<script type='text/javascript'>");out.println("parent.document.getElementById('content').value='"+id+"';");out.println("</script>");}%>

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