iwtProject/xmlhttpRequest.html at main · CaptainLevi25/iwtProject · GitHub

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>AJAX Introduction</title>
    <link rel="stylesheet" href="home.css" />
  </head>
  <body>
    <div class="sidebar">
      <a class="content intro" href="/home.html"> Introduction</a>
      <a
        class="content XMLHTTPRequestObject"
        href="/xmlhttpRequest.html"
        style="background-color: rgb(56, 132, 56);"
        >XML HTTP Request Object</a
      >
      <a class="content XMLHTTPRequestObject" href="/AjaxServerResponse.html">AJAX Server Response</a>
      <a class="content" href="/AjaxXML.html">AJAX XML</a>
      <a class="content" href="/AjaxDatabase.html">AJAX Database</a>
    </div>

    <div class="maincontent">
      <h1 style="padding: 10px">AJAX Request Object</h1>
      <div class="buttons">
        <a href="/home.html" class="button previous" style="cursor: pointer;">Previous</a>
        <a href="/AjaxServerResponse.html" style="cursor: pointer;" class="button next">Next</a>
      </div>
      <hr />

      <div class="second-intro">
        <h1>The XMLHttpRequest Object</h1>

        <h4>All modern browsers support the XMLHttpRequest object.</h4>

        <h4>
          The XMLHttpRequest object can be used to exchange data with a server
          behind the scenes. This means that it is possible to update parts of a
          web page, without reloading the whole page.
        </h4>
      </div>

      <hr />
      <div class="second-create">
        <h2>Create an XMLHttpRequest Object</h2>
        <div class="code-container">
          <h3>syntax for creating xmlhttpRequest object</h3>
          <pre style="background-color: black; padding: 10px">
 variable = new XMLHttpRequest(); </pre
          >
        </div>
      </div>

      <hr />
      <div class="accesscrossdomain">
        <h1>Access Across Domain</h1>
        <p>
          For security reasons, modern browsers do not allow access across
          domains.
        </p>

        <p>
          This means that both the web page and the XML file it tries to load,
          must be located on the same server.
        </p>

        <p>
          The examples on W3Schools all open XML files located on the W3Schools
          domain.
        </p>

        <p>
          If you want to use the example above on one of your own web pages, the
          XML files you load must be located on your own server.
        </p>
      </div>

      <hr>

      <div class="requestObjectMethod">
        <h2>XMLHttpRequest Object Methods</h2>
        <table style="width: 100%;">
            <tr>
                <th>Method</th>
                <th>Description</th>
            </tr>

            <tr>
                <td>new XMLHttpRequest()</td>
               <td> Creates a new XMLHttpRequest object </td>
            </tr>
            <tr>
                <td>abort()</td>
               <td>Cancels the current request </td>
            </tr>
            <tr>
                <td>getAllResponseHeaders()</td>
               <td> Returns header information </td>
            </tr>
            <tr>
                <td>getResponseHeader()</td>
               <td> Returns specific header information </td>
            </tr>
            <tr>
                <td>open(method,url,async,user,psw)</td>
               <td> 	Specifies the request</td>
            </tr>
            <tr>
                <td>send()</td>
               <td>  	Sends the request to the server <br>
                Used for GET requests</td>
            </tr>
            <tr>
                <td>send(string)</td>
               <td>Sends the request to the server.<br>
                Used for POST requests</td>
            </tr>
        </table>
      </div>

      <hr>
      <div class="requestObjectMethod">
        <h2>XMLHttpRequest Object Methods</h2>
        <table style="width: 100%;">
            <tr>
                <th>Property</th>
                <th>Description</th>
            </tr>

            <tr>
                <td>readyState</td>
               <td> 	Holds the status of the XMLHttpRequest.<br>
                0: request not initialized<br>
                1: server connection established<br>
                2: request received<br>
                3: processing request<br>
                4: request finished and response is ready </td>
            </tr>
            <tr>
                <td>onreadystatechange</td>
               <td>Defines a function to be called when the readyState property changes </td>
            </tr>
            <tr>
                <td>responseText</td>
               <td> Returns the response data as a string </td>
            </tr>
            <tr>
                <td>responseXML</td>
               <td> Returns the response data as XML data </td>
            </tr>
            <tr>
                <td>status</td>
               <td>  Returns the status-number of a request <br>
                200: "OK" <br>
                403: "Forbidden" <br>
                404: "Not Found" <br>
                For a complete list go to the Http Messages Reference</td>
            </tr>
            <tr>
                <td>statusText</td>
               <td>   	Returns the status-text (e.g. "OK" or "Not Found")
                </td>
            </tr>

        </table>
      </div>

      <div class="buttons">
        <a href="/home.html" class="button previous" style="cursor: pointer;">Previous</a>
        <a href="/AjaxServerResponse.html" class="button next" style="cursor: pointer;">Next</a>
      </div>

    </div>
  </body>
</html>