AJAX and PHP

Chapter 1All exercises from this book assume that you've installed your machine as shown inAppendix A. If you set up your environment differently you may need to implementvarious changes, such as using different folder names, and so on.Time for Action—Quickstart AJAX1. In Appendix A, you're instructed to set up a web server, and create a web-accessiblefolder called ajax to host all your code for this book. Under the ajax folder, create anew folder called quickstart.2. In the quickstart folder, create a file called index.html, and add the followingcode to it:AJAX with PHP: QuickstartServer wants to know your name:3. Create a new file called quickstart.js, and add the following code:// stores the reference to the XMLHttpRequest objectvar xmlHttp = createXmlHttpRequestObject();// retrieves the XMLHttpRequest objectfunction createXmlHttpRequestObject(){// will store the reference to the XMLHttpRequest objectvar xmlHttp;// if running Internet Explorerif(window.ActiveXObject){try{xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");}catch (e){xmlHttp = false;}}// if running Mozilla or other browserselse{try{xmlHttp = new XMLHttpRequest();}catch (e){xmlHttp = false;}}// return the created object or display an error messageif (!xmlHttp)21