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buildNumber method (opera)

Browser support:
Returns the build number of the browser in Opera.
If you need the version number instead of the build number, use the version method. For further information about the current browser, see the page for the navigator object.


object.buildNumber (["inconspicuous"]);
You can find the related objects in the Supported by objects section below.


Optional. Use this string literal in Opera 6 to get the correct build number. Has no effect from Opera 7.

Return value:

String. The build number.

Example HTML code 1:

This example shows how to get build and version numbers in Opera:
    <script type="text/javascript">
        function GetBuildAndVersionNumber () {
            if (window.opera) {
                var message = "buildNumber : " + window.opera.buildNumber ();
                message += "\nversion : " + window.opera.version ();
                alert (message);
            else {
                alert ("The current browser is not Opera!");
    <button onclick="GetBuildAndVersionNumber ();">Get the build and version numbers in Opera!</button>
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Example HTML code 2:

This example displays various information about the browser and the operating system of the user:
    <script type="text/javascript">
        function AddRowToInfo (description, value) {
            if (value !== undefined) {
                var infoTable = document.getElementById ("info");
                var row = infoTable.insertRow (-1);
                var cell = row.insertCell (-1);
                cell.innerHTML = description;
       = "10px";
                cell = row.insertCell (-1);
                cell.innerHTML = value;
       = "10px";

        function GetVisitorInfo () {
            AddRowToInfo ("Name of the browser (appName)", window.navigator.appName);
            AddRowToInfo ("Name of the browser vendor (vendor)", window.navigator.vendor);
            AddRowToInfo ("Code name of the browser (appCodeName)", window.navigator.appCodeName);
            AddRowToInfo ("Engine of the browser (product)", window.navigator.product);
            AddRowToInfo ("Build number of the browser engine (productSub)", window.navigator.productSub);
            if (window.opera) {
                AddRowToInfo ("Build number of the browser (buildNumber)", window.opera.buildNumber ());
                AddRowToInfo ("Version number of the browser (version)", window.opera.version ());
            AddRowToInfo ("Version and platform of the browser (appVersion)", window.navigator.appVersion);
            AddRowToInfo ("Version of the browser given by the vendor (vendorSub)", window.navigator.vendorSub);
            AddRowToInfo ("Minor version of the browser (appMinorVersion)", window.navigator.appMinorVersion);
            AddRowToInfo ("Build identifier of the browser (buildID)", window.navigator.buildID);
            AddRowToInfo ("User-agent request header (userAgent)", window.navigator.userAgent);
            AddRowToInfo ("Language of the browser (language)", window.navigator.language);
            AddRowToInfo ("Cookies are enabled (cookieEnabled)", window.navigator.cookieEnabled);

            AddRowToInfo ("Operating system (platform)", window.navigator.platform);
            if (window.navigator.language === undefined) {  // in Opera, the language, browserLanguage and userLanguage properties are equivalent
                AddRowToInfo ("Language of the operating system's user interface (browserLanguage)", window.navigator.browserLanguage);
                AddRowToInfo ("Regional and Language settings of the operating system (userLanguage)", window.navigator.userLanguage);
            AddRowToInfo ("Language of the installed operating system (systemLanguage)", window.navigator.systemLanguage);
            AddRowToInfo ("Class of CPU (cpuClass)", window.navigator.cpuClass);
            AddRowToInfo ("Information about the OS and CPU (oscpu)", window.navigator.oscpu);
            AddRowToInfo ("System is online (onLine)", window.navigator.onLine);
<body onload="GetVisitorInfo ();">
    <table id="info" cellpadding="0px" cellspacing="0px" border="1px" style="empty-cells:show;">
            <col style="background-color: #e0a0b0;" />
            <col />
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Supported by objects:

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