Struggling to implement Ajax functionality with JSF on a Tomcat 7.0 server

Question

Struggling to implement Ajax functionality with JSF on a Tomcat 7.0 server

I am new to Ajax and struggling to get a simple example to work...

Here is the javascript code:

var xmlRequest;
function refreshContent() 
{
    if (window.XMLHttpRequest) 
    {
        xmlRequest = new XMLHttpRequest();
    } 
    else 
    {
        xmlRequest = new ActiveXObject("Microsoft.XMLHTTP");
    }

    xmlRequest.onreadystatechange = function() 
    {
        if (xmlRequest.readyState == 4) 
        {
            document.getElementById("tester").innerHTML = xmlRequest.responseText;
        }
    };

    xmlRequest.open("GET", "sample.xhtml", true);
    xmlRequest.send();
}

Now, take a look at the sample xhtml page:

<div id="test">
    SAMPLE CONTENT
</div>
<button type="button" onclick="refreshContent()">Change Text</button>

The JavaScript file has been called.

I have been testing it and it seems like the "xmlRequest.onreadystatechange" is always null and doesn't trigger the function.

Could there be an issue elsewhere, perhaps on the Tomcat server?

javascript ajax jsf

Answer 1

Answer №1

The particular element has been identified with an id of test

<div id="test">

However, you are currently trying to locate it using tester

document.getElementById("tester")

Please correct this issue.

On another note, when delving into the realm of ajax, it is advisable to consider utilizing a reliable framework instead of developing one from scratch. A highly recommended option is jQuery for handling ajax tasks. The implementation is straightforward:

<script src="http://code.jquery.com/jquery-latest.min.js"></script>
<script>
    $(document).ready(function() {
        $('#change').click(function() {
            $.get('test.xhtml', function(responseText) {
                $('#test').text(responseText);
            });
        });
    });
</script>

<body>
    <div id="test">TEST TEXT</div>
    <button id="change">Change content</button>
</body>

Furthermore, when incorporating ajax within a component-based MVC framework like JSF, maintaining synchronization between client and server-side state can be quite complex. It is advised not to develop this from scratch as well. Consider either upgrading to JSF 2.0 which includes built-in ajax functionality

<h:form>
    <h:commandButton value="Change content" action="#{bean.change}">
        <f:ajax execute="@form" render=":test" />
    </h:commandButton>
</h:form>
<h:panelGroup id="test" layout="block">#{bean.text}</h:panelGroup>

using this approach

public void change() {
    this.text = "new text";
}

Alternatively, if you are still using JSF 1.x, consider implementing an ajax-based component library such as RichFaces, IceFaces, PrimeFaces, and so on.

Answer 2

The particular element has been identified with an id of test

<div id="test">

However, you are currently trying to locate it using tester

document.getElementById("tester")

Please correct this issue.

On another note, when delving into the realm of ajax, it is advisable to consider utilizing a reliable framework instead of developing one from scratch. A highly recommended option is jQuery for handling ajax tasks. The implementation is straightforward:

<script src="http://code.jquery.com/jquery-latest.min.js"></script>
<script>
    $(document).ready(function() {
        $('#change').click(function() {
            $.get('test.xhtml', function(responseText) {
                $('#test').text(responseText);
            });
        });
    });
</script>

<body>
    <div id="test">TEST TEXT</div>
    <button id="change">Change content</button>
</body>

Furthermore, when incorporating ajax within a component-based MVC framework like JSF, maintaining synchronization between client and server-side state can be quite complex. It is advised not to develop this from scratch as well. Consider either upgrading to JSF 2.0 which includes built-in ajax functionality

<h:form>
    <h:commandButton value="Change content" action="#{bean.change}">
        <f:ajax execute="@form" render=":test" />
    </h:commandButton>
</h:form>
<h:panelGroup id="test" layout="block">#{bean.text}</h:panelGroup>

using this approach

public void change() {
    this.text = "new text";
}

Alternatively, if you are still using JSF 1.x, consider implementing an ajax-based component library such as RichFaces, IceFaces, PrimeFaces, and so on.

Struggling to implement Ajax functionality with JSF on a Tomcat 7.0 server

Answer №1

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