如何在Scriptlet中传递Javascript变量

Question

i desperately need some suggestion on how a javascript variable make available in Scriptlet. i know that javascript runs on client side where scriptlet code runs on the server. But i think there is some way to make the javascript variable available in scriptlet. below is my code.

Javascript fun

function showDirStructure(repoId, repoName){


        <% 
        String sr = repoId;
        if(sr!=null){
        JSONObject obj = getDirStructure.createJsonObject(request.getParameter("repoId")); 

         %>

The above javascript function (showDirStructure) takes two parameter. i need to use those parameter on Scriplet tag to call createJsonObject (server side method).

Answer 1

Scriptlet is executed before any data about webpage get sent from server to client. Whatever you want to do you need to send postback to server (with forms or ajax call). I usually use jQuery so my answer will use it but feel free to modify it to use native JS code. First, I would create a page on server called createJsonObject, call it from client with $.ajax (type: "POST")and passed my two arguments as object {repoId: repoId, repoName: repoName}. On server I would place my JSP on that page, read argumants upon page load, execute function and return object with data to client. In .done() I would do something with that data (display them in form, save them in JS variables...). Hope this helps.

Answer 2

javascript variable available in scriptlet

NO.

Inside javascript ,you cannot call jsp ,The code with in the scriplets executes on serverside

You need to either make a request to server(HTML forms/AJAX) for new content or Maintain Json object in client side itself while page loading and use it later.

Answer 3

如果您打算解析JSON字符串，则也可以在客户端上进行解析。您可以使用jQuery.parseJSON（ http://api.jquery.com/jQuery.parseJSON/ ）或eval（不是eval虽然推荐）

Answer 4

您可以在第一次加载页面时向同一资源（JSP页面）发送请求，因此scriptlet可以使用javascript变量。