SLWebBridge/Source/Bridge/bridge.js

SLWebBridge = {
    __GLOBAL_FUNC_INDEX__: 0,
    
    _openURL: function(url){
        //create an iframe to send the request
        var i = document.createElement('iframe');
        i.style.display = 'none';
        i.src = url;
        document.body.appendChild(i);
        
        if (i && i.parentNode) {
            //destory the iframe
            i.parentNode.removeChild(i);
        }
    },
    
    invokeClientMethod: function(module, name, parameters, callback) {
        var url = 'slwebbridge://' + module + '/' + name + '?p=' + encodeURIComponent(JSON.stringify(parameters || {}));
        if (callback) {
            var name;
            if (typeof callback == "function") {
                name = SLWebBridge.createGlobalFuncForCallback(callback);
            } else {
                name = callback;
            }
            
            url = url + '&cb=' + name;
        }
        console.log('[API]' + url);
        var r = SLWebBridge._openURL(url);
        return r ? r.result : null;
    },
    
    createGlobalFuncForCallback: function(callback){
        if (callback) {
            var name = '__GLOBAL_CALLBACK__' + (SLWebBridge.__GLOBAL_FUNC_INDEX__++);
            window[name] = function(){
                var args = arguments;
                var func = (typeof callback == "function") ? callback : window[callback];
                //we need to use setimeout here to avoid ui thread being frezzen
                setTimeout(function(){ func.apply(null, args); }, 0);
            };
            return name;
        }
        return null;
    },
    
    invokeWebMethod: function(callback, returnValue) {
        SLWebBridge.invokeCallbackWithArgs(callback, [returnValue]);
    },
    
    invokeCallbackWithArgs: function(callback, args) {
        if (callback) {
            var func = null;
            var tmp;
            if (typeof callback == "function") {
                func = callback;
            }
            else if((tmp = window[callback]) && typeof tmp == 'function') {
                func = tmp;
            }
            if (func) {
                setTimeout(function(){ func.apply(null, args); }, 0);
            }
        }
    }
}