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    <p>This could fit your needs even i'm not sure to understand fully your problematic here.</p> <p>The important point here seems to keep order on ajax method callbacks. You could do something like that:</p> <p>Create these methods:</p> <pre><code> _nextCall: function (deferreds, method) { if (deferreds.length) this._when(deferreds, method); else console.log(method + " SUCCESS"); }, _when: function (calls, method) { var $promise = $.when(this[calls[0]]()) $promise.then(function () { calls.splice(0, 1); this._nextCall(calls, method); }, function () { console.log(method + " FAILED on: " + calls[0]); }); }, </code></pre> <p>Use it like that e.g:</p> <pre><code>logIn: function logIn() { var calls = ["lockDevice", "getCardLogin", "releaseDevice"]; this._when(calls, arguments.callee.name); }, getPinOnly: function getPinOnly() { var calls = ["getPin"]; this._when(calls, arguments.callee.name); }, </code></pre> <p><a href="http://jsfiddle.net/7x5bw/" rel="nofollow">DEMO</a></p> <p>COMPLETE CODE:</p> <pre><code>var CardReader = { //////////////////// // Different possible messages to the Card Reader //////////////////// lockDevice: function () { return this.makeAjaxCall("GET", "/LockDevice", this.lockDeviceCallback); }, getCardLogin: function () { return this.makeAjaxCall("POST", "/getCardLogin", this.getCardLoginCallback); }, getPin: function () { return this.makeAjaxCall("POST", "/getPin", this.getPinCallback); }, releaseDevice: function () { return this.makeAjaxCall("POST", "/Release", this.releaseDeviceCallback); }, ////////////////// // Callbacks for each message to the Card Reader ////////////////// lockDeviceCallback: function (jqXHR, textStatus) { console.log("lockDeviceCallback"); if (textStatus !== "success") { return; } }, getCardLoginCallback: function (jqXHR, textStatus) { console.log("getCardLoginCallback"); if (textStatus !== "success") { return; } }, getPinCallback: function (jqXHR, textStatus) { console.log("getPinCallback"); if (textStatus !== "success") { return; } }, releaseDeviceCallback: function (jqXHR, textStatus) { console.log("releaseDeviceCallback"); if (textStatus !== "success") { return; } //End }, //////////////// // Other methods //////////////// init: function () { // UI BIndings $('#btn_login').on("click", $.proxy(this.logIn, this)); $('#btn_getPinCallback').on("click", $.proxy(this.getPinOnly, this)); }, _nextCall: function (deferreds, method) { if (deferreds.length) this._when(deferreds, method); else console.log(method + " SUCCESS"); }, _when: function (calls, method) { var $promise = $.when(this[calls[0]]()) $promise.then(function () { calls.splice(0, 1); this._nextCall(calls, method); }, function () { console.log(method + " FAILED on: " + calls[0]); }); }, logIn: function logIn() { var calls = ["lockDevice", "getCardLogin", "releaseDevice"]; this._when(calls, arguments.callee.name); }, getPinOnly: function getPinOnly() { var calls = ["getPin"]; this._when(calls, arguments.callee.name); }, makeAjaxCall: function (callType, resource, callbackMethod) { return $.ajax({ type: callType, url: "/echo/json", // + resource, cache: false, dataType: "json", contentType: "application/json", context: this, success: callbackMethod }); } }; CardReader.init(); </code></pre>
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