java - A Simple AJAX with JSP example

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java - A Simple AJAX with JSP example

posted Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

java - A Simple AJAX with JSP example

I am trying to learn AJAX with JSP and I have written the following code. This does not seem to be working. Kindly help:

This is my configuration_page.jsp

    <html>
     <head>
     <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
     <title>JSP Page</title>
     <script type="text/javascript">

      function loadXMLDoc()
      {
        var xmlhttp;
        var config=document.getElementById('configselect').value;
        var url="get_configuration.jsp";
        if (window.XMLHttpRequest)
        {
            xmlhttp=new XMLHttpRequest();
        }
        else
        {
            xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
        }
        xmlhttp.onreadystatechange=function()
        {
            if (xmlhttp.readyState==4 && xmlhttp.status==200)
            {
                document.getElementById("myDiv").innerHTML=xmlhttp.responseText;
            }
        }

        xmlhttp.open("GET", url, true);
        xmlhttp.send();
}
</script>        

</head>

<body>
  <h2 align="center">Saved Configurations</h2>
   Choose a configuration to run: 
  <select name="configselect" width="10">
    <option selected value="select">select</option>
    <option value="Config1">config1</option>
    <option value="Config2">config2</option>
    <option value="Config3">config3</option>
  </select> 
  <button type="button" onclick='loadXMLDoc()'> Submit </button>
  <div id="myDiv">
    <h4>Get data here</h4>
  </div>
 </body>
</html>

This is my get_configuration.jsp which I am trying to access from the AJAX code above:

<html>
  <head>
      <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
      <title>JSP Page</title>

  </head>
  <body>

    <h4>Mee..</h4> 
  </body>
</html>

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1 Reply

深蓝 · Answer 1 · 2021-10-16T23:59:35+0000

I have used jQuery AJAX to make AJAX requests.

Check the following code:

<html>
<head>
    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js"></script>
    <script type="text/javascript">
        $(document).ready(function() {
            $('#call').click(function ()
            {
                $.ajax({
                    type: "post",
                    url: "testme", //this is my servlet
                    data: "input=" +$('#ip').val()+"&output="+$('#op').val(),
                    success: function(msg){      
                            $('#output').append(msg);
                    }
                });
            });

        });
    </script>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>JSP Page</title>
</head>
<body>
    input:<input id="ip" type="text" name="" value="" /><br></br>
    output:<input id="op" type="text" name="" value="" /><br></br>
    <input type="button" value="Call Servlet" name="Call Servlet" id="call"/>
    <div id="output"></div>
</body>

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java - A Simple AJAX with JSP example

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