Accessing ASP.net web services using JavaScript client

I have a client-server application that was developed by someone else, with the client side using JavaScript. I now need to create a new web service in ASP.net, but I'm unsure about how to call web methods. This situation is similar to what's described in this Stack Overflow thread, which unfortunately doesn't provide a clear answer for my specific needs. (It simply suggests using WCF, but I'm unfamiliar with how to implement it) (Note that my client app is completely separate from the server, imagine it being written in Eclipse) I am seeking guidance on how to call the default HelloWorld method of an ASP.net web service from a simple HTML code that includes JavaScript.

Thank you, Ela

javascriptasp.net.netweb-services

Answer №1

Check out the following resources for a comprehensive guide on calling web services using JavaScript/Asp.net Ajax or jQuery.

Here is some sample code:

if (window.XMLHttpRequest) {
    // for IE7+, Firefox, Chrome, Opera, Safari
    this.xmlhttp = new XMLHttpRequest();
}
else {
    // for IE6, IE5
    try {
        this.xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
    } catch (e1) {
        try {
            // older version of Msxml
            this.xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
        } catch (e2) {
            this.xmlhttp = null;
        }
    }
}
xmlhttp.onreadystatechange = function() {
    /// <summary>
    /// Display server time when success
    /// </summary>
    if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
        // success Status
        alert(xmlhttp.responseText);
    }
}
this.xmlhttp.open("POST", "AjaxServer.asmx/WebMethodName", true);
this.xmlhttp.send();

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