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Commit f4af16a

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practice code added
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‎Practice/AjaxDemo.zip‎

2.59 MB
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<!DOCTYPE html>
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<html>
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<style>
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table,
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th,
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td {
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border: 1px solid black;
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border-collapse: collapse;
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}
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th,
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td {
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padding: 5px;
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}
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</style>
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<body>
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<h2>The XMLHttpRequest Object</h2>
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<button type="button" onclick="loadDoc()">Get my CD collection</button>
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<br><br>
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<table id="demo"></table>
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<script>
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function loadDoc() {
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const xhttp = new XMLHttpRequest();
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xhttp.onload = function () {
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myFunction(this);
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}
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xhttp.open("GET", "cd_catalog.xml");
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xhttp.send();
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}
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function myFunction(xml) {
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const xmlDoc = xml.responseXML;
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const x = xmlDoc.getElementsByTagName("CD");
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console.log(x);
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let table = "<tr><th>Artist</th><th>Title</th></tr>";
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for (let i = 0; i < x.length; i++) {
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table += "<tr><td>" +
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x[i].getElementsByTagName("ARTIST")[0].childNodes[0].nodeValue +
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"</td><td>" +
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x[i].getElementsByTagName("TITLE")[0].childNodes[0].nodeValue +
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"</td></tr>";
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}
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document.getElementById("demo").innerHTML = table;
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}
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</script>
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</body>
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</html>

‎Practice/AjaxDemo/Ajax-XML.html‎

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<!DOCTYPE html>
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<html>
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<body>
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<div id='showCD'></div><br>
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<input type="button" onclick="previous()" value="<<">
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<input type="button" onclick="next()" value=">>">
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<script>
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var i = 0;
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var x;
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displayCD(i);
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function displayCD(i) {
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var xmlhttp = new XMLHttpRequest();
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xmlhttp.onreadystatechange = function() {
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if (this.readyState == 4 && this.status == 200) {
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myFunction(this, i);
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}
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};
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xmlhttp.open("GET", "cd_catalog.xml", true);
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xmlhttp.send();
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}
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function myFunction(xml, i) {
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var xmlDoc = xml.responseXML;
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x = xmlDoc.getElementsByTagName("CD");
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document.getElementById("showCD").innerHTML =
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"Artist: " +
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x[i].getElementsByTagName("ARTIST")[0].childNodes[0].nodeValue +
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"<br>Title: " +
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x[i].getElementsByTagName("TITLE")[0].childNodes[0].nodeValue +
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"<br>Year: " +
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x[i].getElementsByTagName("YEAR")[0].childNodes[0].nodeValue;
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}
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function next() {
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if (i < x.length-1) {
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i++;
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displayCD(i);
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} }
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function previous() {
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if (i > 0) {
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i--;
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displayCD(i);
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} }
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</script>
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</body>
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</html>
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<!DOCTYPE html>
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<html>
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<body>
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<h2>JavaScript Callbacks</h2>
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<p id="demo"></p>
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<script>
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function myDisplayer(some) {
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document.getElementById("demo").innerHTML = some;
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}
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function getFile(myCallback) {
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let req = new XMLHttpRequest();
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req.open('GET', "mycar.html");
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req.onload = function() {
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if (req.status == 200) {
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myCallback(this.responseText);
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} else {
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myCallback("Error: " + req.status);
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}
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}
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req.send();
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}
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getFile(myDisplayer);
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</script>
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</body>
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</html>
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<!DOCTYPE html>
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<html>
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<body>
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<h2>JavaScript setInterval()</h2>
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<p>Using setInterval() to display the time every second (1000 milliseconds).</p>
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<h1 id="demo"></h1>
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<script>
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setInterval(myFunction, 1000);
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function myFunction() {
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let d = new Date();
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document.getElementById("demo").innerHTML=
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d.getHours() + ":" +
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d.getMinutes() + ":" +
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d.getSeconds();
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}
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</script>
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</body>
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</html>
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import java.io.IOException;
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import java.io.PrintWriter;
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import java.sql.Connection;
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import java.sql.DriverManager;
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import java.sql.PreparedStatement;
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import java.sql.ResultSet;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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public class EmployeeServlet extends HttpServlet {
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protected void doGet(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException
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{
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response.setContentType("text/html;charset=UTF-8");
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PrintWriter out = response.getWriter();
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String ss=request.getParameter("q");
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String url = "jdbc:mysql://localhost:3306/ajaxdemo";
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String user = "root";
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String password = "ssn@123";
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try{
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//2. Load JDBC Driver and register the driver
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Class.forName("com.mysql.cj.jdbc.Driver").newInstance();
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System.out.println("Hey I am after forname method");
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//3. Open a Connection
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Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/ajaxdemo?allowPublicKeyRetrieval=true&useSSL=false",user,password);
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//Connection conn = DriverManager.getConnection(url,user,password);
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System.out.println("con--->"+con);
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PreparedStatement ps=con.prepareStatement("select * from ajaxemployee where name=?");
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System.out.println("Hey I am after prepared statement");
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ps.setString(1,ss);
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ResultSet rs=ps.executeQuery();
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if(rs.next()){
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out.println("name is already existing");
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}
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else
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out.println("name doesnot already exist");
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}
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catch(Exception e)
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{
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e.printStackTrace();
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}
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}
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}
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‎Practice/AjaxDemo/WEB-INF/web.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
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<servlet>
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<servlet-name>EmployeeServlet</servlet-name>
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<servlet-class>EmployeeServlet</servlet-class>
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</servlet>
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<servlet-mapping>
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<servlet-name>EmployeeServlet</servlet-name>
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<url-pattern>/s</url-pattern>
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</servlet-mapping>
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<session-config>
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<session-timeout>
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30
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</session-timeout>
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</session-config>
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</web-app>

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