How to detect which Bootstrap version is used from JavaScript?

Question

I\'ve been looking at the CSS & JavaScript from Bootstrap 3. Nothing is modularized under a common alias. For the JavaScript, it is injected into jQuery\'s prototype...<

Answer 1

I share my Javascript Module :

/**
 * Created by LJT.
 */
myBootstrapUtils = function () {

    /**
     * Search bootstrap.min.js or bootstrap.js in DOM
     * @return {*}
     */
    function getBootStrapJsUrl() {
        var bootstrapUrl;
        $('script').each(function () {
            var externalJsSrc = $(this).attr('src');
            if (typeof externalJsSrc !== 'undefined') {
                if (externalJsSrc.toLowerCase().lastIndexOf('bootstrap.min.js') !== -1 || externalJsSrc.toLowerCase().lastIndexOf('bootstrap.js') !== -1) {
                    bootstrapUrl = externalJsSrc;
                    return false;
                }
            }
        });
        return bootstrapUrl;
    }

    function hasBootStrapJs() {
        return getBootStrapJsUrl() !== undefined;
    }


    /**
     * This function grab the bootstrap's version in Js File
     * @param data Data file representation
     * @return {*}
     */
    function analyseBootstrapJsFile(data) {
        var bootstrapVersion;
        var matches = data.match(/v[.\d]+[.\d]/);
        if (matches === null) {
            bootstrapVersion = 'unknown';
        } else {
            //Security Array.isArray(matches) === true ?
            bootstrapVersion = matches[0];
        }
        //console.log(bootstrapVersion);
        return bootstrapVersion;
    }


    function getBootStrapJsVersionSyncMode() {
        var version,
            bootstrapUrl = getBootStrapJsUrl();
        if (bootstrapUrl !== undefined) {
            jQuery.ajax({
                url: bootstrapUrl,
                success: function (data) {
                    version = analyseBootstrapJsFile(data);
                },
                async: false
            });
        }
        return version;
    }

    function getBootStrapJsVersionAsyncMode(defered) {
        var bootstrapUrl = getBootStrapJsUrl();
        if (bootstrapUrl !== undefined) {
            $.get(bootstrapUrl)
                .then(function (data) {
                    version = analyseBootstrapJsFile(data);
                    defered.resolve(version);
                })
                .fail(function () {
                    defered.fail();
                });
        } else {
            defered.fail();
        }
    }

    /**
     * Example for async mode usage
     */
    function exampleAsyncMode() {
        var dfd = $.Deferred();
        dfd.done(function (version) {
            console.log('My bootstrap version is : ' + version);
        });
        dfd.fail(function (version) {
            console.log('Error while request bootstrap version ...');
        });
        getBootStrapJsVersionAsyncMode(dfd);
    }

    /**
     * Easy way to get bootstrap plugin version
     * @see http://getbootstrap.com/javascript/#js-version-nums
     * @return {*}
     */
    function getBoostrapModalVersion() {
        return $.fn.modal.Constructor.VERSION;
    }

    return {
        hasBootStrapJs: hasBootStrapJs,
        getBootStrapJsVersionSyncMode: getBootStrapJsVersionSyncMode,
        getBootStrapJsVersionAsyncMode: getBootStrapJsVersionAsyncMode
    }
}();

console.log(myBootstrapUtils.hasBootStrapJs());
console.log(myBootstrapUtils.getBootStrapJsVersionSyncMode());
//myBootstrapUtils.exampleAsyncMode();