A Brief Analysis of the Problem of Value Transfer Between JSP Pages

This paper analyzes the problem of value transfer between JSP pages with examples. Share it for your reference, as follows:

The simplest of them is < a > The href in the tag has passed the value,

Write in a. jsp:

<a href="b.jsp?name1= Value "></a>

Then receive in b. jsp:

<%
   String name2 = new String(request.getParameter("name1").getBytes("ISO-8859-1"),"GBK");
   request.setAttribute("name3",name2);
%>
<input id="id1" value="${name3}"/>

This method is relatively simple, but I also found a problem, for example, can not load dynamically, it is when the page is loaded, the value is also attached, for example,

I have one here < select > Label, which is dynamically cascaded with 1 provinces and cities, then I want to take it at this time < select > The values inside can no longer be passed by href, because I chose < select > The value in it is after the page is loaded, which is what individuals do.

<script>
  var href = "b.jsp?sd=";
  var getV = function(){
    var add = $("#ad").val();
    href = href + add;
  }
  var h1 = function(){
   　　 window.location = href;
 　　 }
</script>
<select id="ad" onChange="getV()"></select>
<a id="h" href="#" onClick="hl()" ></a>

I hope this article is helpful to everyone's JSP programming.