One failing declareGadget should not breaks the next calls.

dist/renderjs-0.3.3.min.js

+!function(a){"use strict";var b=a.prototype,c=b.parseFromString;try{if((new a).parseFromString("","text/html"))return}catch(d){}b.parseFromString=function(a,b){var d,e,f,g;return/^\s*text\/html\s*(?:;|$)/i.test(b)?(e=document.implementation.createHTMLDocument(""),f=e.documentElement,f.innerHTML=a,g=f.firstElementChild,1===f.childElementCount&&"html"===g.localName.toLowerCase()&&e.replaceChild(g,f),d=e):d=c.apply(this,arguments),d}}(DOMParser),function(a,b,c,d,e,f){"use strict";function g(){return this instanceof g?void 0:new g}function h(){return this instanceof h?(g.call(this),void 0):new h}function i(b,d){var e;return d.element===f&&(d.element=a.createElement("div")),(new c.Queue).push(function(){return o.declareGadgetKlass(b)}).push(function(a){var b,f=a.template_element.body.childNodes;for(m=a,e=new a,e.element=d.element,b=0;b<f.length;b+=1)e.element.appendChild(f[b].cloneNode(!0));return c.all([e.getRequiredJSList(),e.getRequiredCSSList()])}).push(function(a){var b,d=[];for(b=0;b<a[0].length;b+=1)d.push(o.declareJS(a[0][b]));for(b=0;b<a[1].length;b+=1)d.push(o.declareCSS(a[1][b]));return c.all(d)}).push(function(){return e})}function j(){return this instanceof j?(g.call(this),void 0):new j}function k(b,d){var g,h,i,k=c.defer();if(d.element===f)throw new Error("DOM element is required to create Iframe Gadget "+b);for(i=d.element.parentNode;null!==i&&i!==a;)i=i.parentNode;if(null===i)throw new Error("The parent element is not attached to the DOM for "+b);return g=new j,h=a.createElement("iframe"),h.setAttribute("src",b),g.path=b,g.element=d.element,d.element.appendChild(h),g.chan=e.build({window:h.contentWindow,origin:"*",scope:"renderJS"}),g.chan.bind("declareMethod",function(a,b){return g[b]=function(){var a=arguments;return new c.Promise(function(c,d){g.chan.call({method:"methodCall",params:[b,Array.prototype.slice.call(a,0)],success:function(a){c(a)},error:function(a){d(a)}})})},"OK"}),g.chan.bind("ready",function(){return k.resolve(g),"OK"}),g.chan.bind("failed",function(a,b){return k.reject(b),"OK"}),c.any([k.promise,c.timeout(5e3)])}function l(){var d,i,j,k,l,s=b.location.href,t=0,u=!1;if(p.hasOwnProperty(s))throw new Error("bootstrap should not be called twice");n=new c.Promise(function(n,v){function w(){var b,e,g=o.parseGadgetHTMLDocument(a);for(e in g)g.hasOwnProperty(e)&&(d.prototype[e]=g[e]);for(d.template_element=a.createElement("div"),i.element=a.body,b=0;b<i.element.childNodes.length;b+=1)d.template_element.appendChild(i.element.childNodes[b].cloneNode(!0));c.all([i.getRequiredJSList(),i.getRequiredCSSList()]).then(function(a){function b(){return i}var e,g,h=a[0],j=a[1];for(e=0;e<h.length;e+=1)q[h[e]]=null;for(e=0;e<j.length;e+=1)r[j[e]]=null;for(m=f,g=new c.Queue,g.push(b),e=0;e<d.ready_list.length;e+=1)g.push(d.ready_list[e]),g.push(b);return g.push(n,function(a){throw v(a),a}),g}).fail(function(a){v(a)})}b.self===b.top?(d=function(){g.call(this)},d.declareMethod=g.declareMethod,d.ready_list=[],d.ready=g.ready,d.prototype=new g,d.prototype.constructor=d,d.prototype.path=s,p[s]=d,i=new p[s]):(j=e.build({window:b.parent,origin:"*",scope:"renderJS"}),d=h,i=new h,j.bind("methodCall",function(a,b){i[b[0]].apply(i,b[1]).then(function(b){a.complete(b)}).fail(function(b){a.error(b.toString())}),a.delayReturn(!0)}),k=function(){0===t&&u===!0&&j.notify({method:"ready"})},l=function(a){t+=1,j.call({method:"declareMethod",params:a,success:function(){t-=1,k()},error:function(){t-=1}})},l("getInterfaceList"),l("getRequiredCSSList"),l("getRequiredJSList"),l("getPath"),l("getTitle"),d.declareMethod=function(a,b){var c=g.declareMethod.apply(this,[a,b]);return l(a),c}),m=d,a.addEventListener("DOMContentLoaded",w,!1)}),b.self!==b.top&&n.then(function(){u=!0,k()}).fail(function(a){throw j.notify({method:"failed",params:a.toString()}),a})}var m,n,o,p={},q={},r={};g.prototype.title="",g.prototype.interface_list=[],g.prototype.path="",g.prototype.html="",g.prototype.required_css_list=[],g.prototype.required_js_list=[],g.ready_list=[],g.ready=function(a){return this.ready_list.push(a),this},g.declareMethod=function(a,b){return this.prototype[a]=function(){var a=this,d=arguments;return(new c.Queue).push(function(){return b.apply(a,d)})},this},g.declareMethod("getInterfaceList",function(){return this.interface_list}).declareMethod("getRequiredCSSList",function(){return this.required_css_list}).declareMethod("getRequiredJSList",function(){return this.required_js_list}).declareMethod("getPath",function(){return this.path}).declareMethod("getTitle",function(){return this.title}).declareMethod("getElement",function(){if(this.element===f)throw new Error("No element defined");return this.element}),h.ready_list=[],h.ready=g.ready,h.prototype=new g,h.prototype.constructor=h,j.ready_list=[],j.ready=g.ready,j.prototype=new g,j.prototype.constructor=j,g.prototype.declareGadget=function(a,b){var d,e=n;return b===f&&(b={}),b.sandbox===f&&(b.sandbox="public"),d=(new c.Queue).push(function(){return e}).push(f,function(){}).push(function(){var c;if("public"===b.sandbox)c=i;else{if("iframe"!==b.sandbox)throw new Error("Unsupported sandbox options '"+b.sandbox+"'");c=k}return c(a,b)}).push(function(a){function b(){return a}var c;for(m=f,c=0;c<a.constructor.ready_list.length;c+=1)d.push(a.constructor.ready_list[c]),d.push(b);return a}).push(f,function(a){throw m=f,a}),n=d},o=function(a){var c;if(a===b?c=m:a instanceof g&&(c=a),c===f)throw new Error("Unknown selector '"+a+"'");return c},o.declareJS=function(b){var d;return d=q.hasOwnProperty(b)?c.resolve():new c.Promise(function(c,d){var e;e=a.createElement("script"),e.type="text/javascript",e.src=b,e.onload=function(){q[b]=null,c()},e.onerror=function(a){d(a)},a.head.appendChild(e)})},o.declareCSS=function(b){var d;return d=r.hasOwnProperty(b)?c.resolve():new c.Promise(function(c,d){var e;e=a.createElement("link"),e.rel="stylesheet",e.type="text/css",e.href=b,e.onload=function(){r[b]=null,c()},e.onerror=function(a){d(a)},a.head.appendChild(e)})},o.declareGadgetKlass=function(a){function b(){var b,c,e;if(!p.hasOwnProperty(a)){b=function(){g.call(this)},b.ready_list=[],b.declareMethod=g.declareMethod,b.ready=g.ready,b.prototype=new g,b.prototype.constructor=b,b.prototype.path=a,b.template_element=(new d).parseFromString(j.responseText,"text/html"),e=o.parseGadgetHTMLDocument(b.template_element);for(c in e)e.hasOwnProperty(c)&&(b.prototype[c]=e[c]);p[a]=b}return p[a]}function e(c,d){function e(){var a;try{0===j.readyState?d(j):4===j.readyState&&(j.status<200||j.status>=300||!/^text\/html[;]?/.test(j.getResponseHeader("Content-Type")||"")?d(j):(a=b(),c(a)))}catch(e){d(e)}}j=new XMLHttpRequest,j.open("GET",a),j.onreadystatechange=e,j.setRequestHeader("Accept","text/html"),j.withCredentials=!0,j.send()}function h(){j!==f&&j.readyState!==j.DONE&&j.abort()}var i,j;return i=p.hasOwnProperty(a)?c.resolve(p[a]):new c.Promise(e,h)},o.clearGadgetKlassList=function(){p={},q={},r={}},o.parseGadgetHTMLDocument=function(a){var b,c,d={title:"",interface_list:[],required_css_list:[],required_js_list:[]};if(9!==a.nodeType)throw new Error("The first parameter should be an HTMLDocument");for(d.title=a.title,b=0;b<a.head.children.length;b+=1)c=a.head.children[b],null!==c.href&&("stylesheet"===c.rel?d.required_css_list.push(c.getAttribute("href")):"text/javascript"===c.type?d.required_js_list.push(c.getAttribute("src")):"http://www.renderjs.org/rel/interface"===c.rel&&d.interface_list.push(c.getAttribute("href")));return d},b.rJS=b.renderJS=o,b.RenderJSGadget=g,b.RenderJSEmbeddedGadget=h,b.RenderJSIframeGadget=j,l()}(document,window,RSVP,DOMParser,Channel);
\ No newline at end of file

dist/renderjs-latest.js

-/*! RenderJs v0.3.2 */
+/*! RenderJs */
 
 /*
  * DOMParser HTML extension
@@ -311,6 +311,10 @@
       .push(function () {
         return previous_loading_gadget_promise;
       })
+      .push(undefined, function () {
+        // Forget previous declareGadget error
+        return;
+      })
       .push(function () {
         var method;
         if (options.sandbox === "public") {

package.json

 {
   "name": "renderjs",
-  "version": "0.3.2",
+  "version": "0.3.3",
   "description": "RenderJs provides HTML5 gadgets",
   "main": "dist/renderjs-latest.js",
   "directories": {

renderjs.js

-/*! RenderJs v0.3.2 */
+/*! RenderJs */
 
 /*
  * DOMParser HTML extension
@@ -311,6 +311,10 @@
       .push(function () {
         return previous_loading_gadget_promise;
       })
+      .push(undefined, function () {
+        // Forget previous declareGadget error
+        return;
+      })
       .push(function () {
         var method;
         if (options.sandbox === "public") {

test/renderjs_test.js

@@ -1667,6 +1667,42 @@
       });
   });
 
+  test('One failing gadget does not prevent the others to load', function () {
+    // Check that dependencies are loaded once if 2 gadgets are created
+    var gadget = new RenderJSGadget(),
+      html_url = 'https://example.org/files/qunittest/test12345.html',
+      html_url2 = 'https://example.org/files/qunittest/test12346.html',
+      mock;
+
+    this.server.respondWith("GET", html_url, [404, {
+      "Content-Type": "text/html"
+    }, "error"]);
+    this.server.respondWith("GET", html_url2, [200, {
+      "Content-Type": "text/html"
+    }, "raw html"]);
+
+    mock = sinon.mock(renderJS, "parseGadgetHTMLDocument");
+    mock.expects("parseGadgetHTMLDocument").once().returns({});
+
+    stop();
+    gadget.declareGadget(html_url)
+      .then(function () {
+        ok(false);
+      })
+      .fail(function () {
+        return gadget.declareGadget(html_url2);
+      })
+      .then(function () {
+        ok(true);
+      })
+      .always(function () {
+        // Check that only one request has been done.
+        start();
+        mock.verify();
+        mock.restore();
+      });
+  });
+
   test('Wait for ready callback before returning', function () {
 
     // Subclass RenderJSGadget to not pollute its namespace