BAEL-6670: Reading a JSP variable from JavaScript (#14337)

2023-07-09 04:24:38 +01:00
parent 6fa3c122e3
commit ba1764fba1
6 changed files with 114 additions and 0 deletions
@@ -0,0 +1,31 @@
+package com.baeldung.boot.jsp.controller;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+
+@Controller
+@RequestMapping("/jsp-var")
+public class JSPVariableController {
+
+    @GetMapping("/by-jsp")
+    public String byJsp() {
+        return "/jsp-var/by-jsp";
+    }
+
+    @GetMapping("/by-el")
+    public String byEl() {
+        return "/jsp-var/by-el";
+    }
+
+    @GetMapping("/by-jstl")
+    public String byJstl() {
+        return "/jsp-var/by-jstl";
+    }
+
+    @GetMapping("/to-dom")
+    public String byDom() {
+        return "/jsp-var/to-dom";
+    }
+
+}
@@ -0,0 +1,18 @@
+<%@ page import="org.apache.commons.text.StringEscapeUtils" %>
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+<%
+    String jspMsg = StringEscapeUtils.escapeEcmaScript("Hello! This is Sam's page.");
+    request.setAttribute("jspMsg", jspMsg);
+%>
+<html>
+    <head>
+        <title>Conversion by JSP EL</title>
+        <script type="text/javascript">
+            var jsMsg = '${requestScope.jspMsg}';
+            console.info(jsMsg);
+        </script>
+    </head>
+    <body>
+       <div>Open the browser console to see the message.</div>
+    </body>
+</html>
@@ -0,0 +1,16 @@
+<%@ page import="org.apache.commons.text.StringEscapeUtils" %>
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+<%
+    String jspMsg = StringEscapeUtils.escapeEcmaScript("Hello! This is Sam's page.");
+%>
+<html>
+    <head>
+        <title>Conversion by JSP expression tag</title>
+            var jsMsg = '<%=jspMsg%>';
+            console.info(jsMsg);
+        </script>
+    </head>
+    <body>
+       <div>Open the browser console to see the message.</div>
+    </body>
+</html>
@@ -0,0 +1,19 @@
+<%@ page import="org.apache.commons.text.StringEscapeUtils" %>
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
+<%
+    String jspMsg = StringEscapeUtils.escapeEcmaScript("Hello! This is Sam's page.");
+    request.setAttribute("scopedMsg", jspMsg);
+%>
+<html>
+    <head>
+        <title>Conversion by JSTL</title>
+        <script type="text/javascript">
+            var jsMsg = '<c:out value="${scopedMsg}" escapeXml="false"/>';
+            console.info(jsMsg);
+        </script>
+    </head>
+    <body>
+       <div>Open the browser console to see the message.</div>
+    </body>
+</html>
@@ -0,0 +1,19 @@
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+<%
+    String jspTag = "<h1>Hello</h1>";
+%>
+<html>
+    <head>
+        <title>Convert to an HTML tag</title>
+        <script type="text/javascript">
+            function printTag() {
+                var tags = document.getElementById("fromJspTag").innerHTML;
+                console.info(tags);
+            }
+        </script>
+    </head>
+    <body onLoad="printTag()">
+       <div id="fromJspTag"><%=jspTag%></div>
+       <div>Open the browser console to see the tags.</div>
+    </body>
+</html>