source: Dev/branches/rest-dojo-ui/client/dojox/rails.js @ 257

dojo.provide("dojox.rails");
dojo.require("dojo.NodeList-traverse");

dojox.rails.live = function(selector, evtName, fn){
        if (dojo.isIE && evtName.match(/^(on)?submit$/i)){
                dojox.rails.live(selector, "click", function(evt){
                        var target = evt.target, tag = target.tagName.toLowerCase();
                        if ((tag == "input" || tag == "button") && dojo.attr(target, "type").toLowerCase() == "submit"){
                                 var form = dojo.query(target).closest("form");
                                 if (form.length){
                                        var h = dojo.connect(form[0], "submit", function(evt){
                                                dojo.disconnect(h);
                                                fn.call(evt.target, evt);
                                        });
                                }
                        }
                });
        }else{
                dojo.connect(dojo.body(), evtName, function(evt){
                        var nl = dojo.query(evt.target).closest(selector);
                        if (nl.length){
                                fn.call(nl[0], evt);
                        }
                });
        }
};

dojo.ready((function(d, dr, dg){
        return function() {
                var q = d.query, live = dr.live,
                                csrfToken = q("meta[name=csrf-token]").attr("content"),
                    csrfParam = q("meta[name=csrf-param]").attr("content");

                var createFormForLink = function(url, method){
                        var form = '<form style="display:none" method="post" action="'+ url +'">' +
                                '<input type="hidden" name="_method" value="'+ method +'" />' +
                                '<input type="hidden" name="'+ csrfParam +'" value="'+ csrfToken +'" />' +
                                '</form>';
                        return dojo.place(form, dojo.body());
                };

                var disable = function(elements){
                        d.forEach(elements, function(node){
                                if (!d.attr(node, "disabled")){
                                        var attr = node.tagName.toLowerCase() == "input" ? "value" : "innerHTML";
                                        var message = d.attr(node, "data-disable-with");
                                        var originalValue = d.attr(node, attr);
                                        d.attr(node, "disabled", true);
                                        d.attr(node, "data-original-value", originalValue);
                                        d.attr(node, attr, message);
                                }
                        });
                };

                var typeMap = {
                        "text":                  "text",
                        "json":                  "application/json",
                        "json-comment-optional": "text",
                        "json-comment-filtered": "text",
                        "javascript":            "application/javascript",
                        "xml":                   "text/xml"
                };

                var handleRemote = function(evt){
                        var el = evt.target, tag = el.tagName.toLowerCase();
                        var content = tag.toLowerCase() == "form" ? d.formToObject(el) : {},
                                        type   =  d.attr(el, "data-type") || "javascript",
                                        method = (d.attr(el, "method")    || d.attr(el, "data-method") || "get").toLowerCase(),
                                        url    =  d.attr(el, "action")    || d.attr(el, "href");

                        if (tag != "form" && method != "get"){
                                        el = createFormForLink(url, method);
                                        method = "POST";
                        }
                        evt.preventDefault();


                        // ajax:loading, ajax:loaded, and ajax:interactive are not supported
                        d.publish("ajax:before", [el]);
                        var deferred = d.xhr(method, {
                                url:      url,
                                headers:  { "Accept": typeMap[type] },
                                content:  content,
                                handleAs: type,
                                load:             function(response, ioArgs) {d.publish("ajax:success",  [el, response, ioArgs]);},
                                error:    function(response, ioArgs) {d.publish("ajax:failure",  [el, response, ioArgs]);},
                                handle:   function(response, ioArgs) {d.publish("ajax:complete", [el, response, ioArgs]);}
                        });
                        d.publish("ajax:after", [el]);
                };

                var handleEnable        = function(el){
                        q("*[data-disable-with][disabled]", el).forEach(function(node){
                                var attr = node.tagName.toLowerCase() == "input" ? "value" : "innerHTML";
                                var value = d.attr(node, "data-original-value");
                                d.attr(node, "disabled", false);
                                d.attr(node, "data-original-value", null);
                                d.attr(node, attr, value);
                        });
                };

                var handleDataMethod = function(evt){
                        var el = evt.target, form = createFormForLink(el.href, dojo.attr(el, "data-method"));
                        evt.preventDefault();
                        form.submit();
                };

                var handleFormSubmit = function(evt){
                        var el = evt.target, elements = q("*[data-disable-with]", el);
                        if (elements.length){ disable(elements); }
                        if (d.attr(el, "data-remote")){
                                evt.preventDefault();
                                handleRemote(evt);
                        }
                };

                var handleConfirm = function(evt){
                        var proceed = dg.confirm(d.attr(evt.target, "data-confirm"));
                        if (!proceed){
                                evt.preventDefault();
                        }else if (d.attr(evt.target, "data-remote")){
                                handleRemote(evt);
                        }
                };

                // Register data-{action} elements.      Order is important since the return values
                // from previously called functions in the connect chain influence whether
                // or not the next function in the chain is called.

                // Register data-confirm elements
                live("*[data-confirm]", "click", handleConfirm);

                // data-disable-with only applies to forms
                d.subscribe("ajax:complete", handleEnable);

                // Register data-remote elements
                live("a[data-remote]:not([data-confirm])", "click", handleRemote);
                live("a[data-method]:not([data-remote])", "click", handleDataMethod);

                // Handle form submits
                live("form", "submit", handleFormSubmit);
        };
})(dojo, dojox.rails, dojo.global));