browserio.js

初学者

/*
	Copyright (c) 2004-2006, The Dojo Foundation
	All Rights Reserved.

	Licensed under the Academic Free License version 2.1 or above OR the
	modified BSD license. For more information on Dojo licensing, see:

		http://dojotoolkit.org/community/licensing.shtml
*/



dojo.provide("dojo.io.BrowserIO");
dojo.require("dojo.io.common");
dojo.require("dojo.lang.array");
dojo.require("dojo.lang.func");
dojo.require("dojo.string.extras");
dojo.require("dojo.dom");
dojo.require("dojo.undo.browser");
if (!dj_undef("window")) {
	dojo.io.checkChildrenForFile = function (node) {
		var hasFile = false;
		var inputs = node.getElementsByTagName("input");
		dojo.lang.forEach(inputs, function (input) {
			if (hasFile) {
				return;
			}
			if (input.getAttribute("type") == "file") {
				hasFile = true;
			}
		});
		return hasFile;
	};
	dojo.io.formHasFile = function (formNode) {
		return dojo.io.checkChildrenForFile(formNode);
	};
	dojo.io.updateNode = function (node, urlOrArgs) {
		node = dojo.byId(node);
		var args = urlOrArgs;
		if (dojo.lang.isString(urlOrArgs)) {
			args = {url:urlOrArgs};
		}
		args.mimetype = "text/html";
		args.load = function (t, d, e) {
			while (node.firstChild) {
				dojo.dom.destroyNode(node.firstChild);
			}
			node.innerHTML = d;
		};
		dojo.io.bind(args);
	};
	dojo.io.formFilter = function (node) {
		var type = (node.type || "").toLowerCase();
		return !node.disabled && node.name && !dojo.lang.inArray(["file", "submit", "image", "reset", "button"], type);
	};
	dojo.io.encodeForm = function (formNode, encoding, formFilter) {
		if ((!formNode) || (!formNode.tagName) || (!formNode.tagName.toLowerCase() == "form")) {
			dojo.raise("Attempted to encode a non-form element.");
		}
		if (!formFilter) {
			formFilter = dojo.io.formFilter;
		}
		var enc = /utf/i.test(encoding || "") ? encodeURIComponent : dojo.string.encodeAscii;
		var values = [];
		for (var i = 0; i < formNode.elements.length; i++) {
			var elm = formNode.elements[i];
			if (!elm || elm.tagName.toLowerCase() == "fieldset" || !formFilter(elm)) {
				continue;
			}
			var name = enc(elm.name);
			var type = elm.type.toLowerCase();
			if (type == "select-multiple") {
				for (var j = 0; j < elm.options.length; j++) {
					if (elm.options[j].selected) {
						values.push(name + "=" + enc(elm.options[j].value));
					}
				}
			} else {
				if (dojo.lang.inArray(["radio", "checkbox"], type)) {
					if (elm.checked) {
						values.push(name + "=" + enc(elm.value));
					}
				} else {
					values.push(name + "=" + enc(elm.value));
				}
			}
		}
		var inputs = formNode.getElementsByTagName("input");
		for (var i = 0; i < inputs.length; i++) {
			var input = inputs[i];
			if (input.type.toLowerCase() == "image" && input.form == formNode && formFilter(input)) {
				var name = enc(input.name);
				values.push(name + "=" + enc(input.value));
				values.push(name + ".x=0");
				values.push(name + ".y=0");
			}
		}
		return values.join("&") + "&";
	};
	dojo.io.FormBind = function (args) {
		this.bindArgs = {};
		if (args && args.formNode) {
			this.init(args);
		} else {
			if (args) {
				this.init({formNode:args});
			}
		}
	};
	dojo.lang.extend(dojo.io.FormBind, {form:null, bindArgs:null, clickedButton:null, init:function (args) {
		var form = dojo.byId(args.formNode);
		if (!form || !form.tagName || form.tagName.toLowerCase() != "form") {
			throw new Error("FormBind: Couldn't apply, invalid form");
		} else {
			if (this.form == form) {
				return;
			} else {
				if (this.form) {
					throw new Error("FormBind: Already applied to a form");
				}
			}
		}
		dojo.lang.mixin(this.bindArgs, args);
		this.form = form;
		this.connect(form, "onsubmit", "submit");
		for (var i = 0; i < form.elements.length; i++) {
			var node = form.elements[i];
			if (node && node.type && dojo.lang.inArray(["submit", "button"], node.type.toLowerCase())) {
				this.connect(node, "onclick", "click");
			}
		}
		var inputs = form.getElementsByTagName("input");
		for (var i = 0; i < inputs.length; i++) {
			var input = inputs[i];
			if (input.type.toLowerCase() == "image" && input.form == form) {
				this.connect(input, "onclick", "click");
			}
		}
	}, onSubmit:function (form) {
		return true;
	}, submit:function (e) {
		e.preventDefault();
		if (this.onSubmit(this.form)) {
			dojo.io.bind(dojo.lang.mixin(this.bindArgs, {formFilter:dojo.lang.hitch(this, "formFilter")}));
		}
	}, click:function (e) {
		var node = e.currentTarget;
		if (node.disabled) {
			return;
		}
		this.clickedButton = node;
	}, formFilter:function (node) {
		var type = (node.type || "").toLowerCase();
		var accept = false;
		if (node.disabled || !node.name) {
			accept = false;
		} else {
			if (dojo.lang.inArray(["submit", "button", "image"], type)) {
				if (!this.clickedButton) {
					this.clickedButton = node;
				}
				accept = node == this.clickedButton;
			} else {
				accept = !dojo.lang.inArray(["file", "submit", "reset", "button"], type);
			}
		}
		return accept;
	}, connect:function (srcObj, srcFcn, targetFcn) {
		if (dojo.evalObjPath("dojo.event.connect")) {
			dojo.event.connect(srcObj, srcFcn, this, targetFcn);
		} else {
			var fcn = dojo.lang.hitch(this, targetFcn);
			srcObj[srcFcn] = function (e) {
				if (!e) {
					e = window.event;
				}
				if (!e.currentTarget) {
					e.currentTarget = e.srcElement;
				}
				if (!e.preventDefault) {
					e.preventDefault = function () {
						window.event.returnValue = false;
					};
				}
				fcn(e);
			};
		}
	}});
	dojo.io.XMLHTTPTransport = new function () {
		var _this = this;
		var _cache = {};
		this.useCache = false;
		this.preventCache = false;
		function getCacheKey(url, query, method) {
			return url + "|" + query + "|" + method.toLowerCase();
		}
		function addToCache(url, query, method, http) {
			_cache[getCacheKey(url, query, method)] = http;
		}
		function getFromCache(url, query, method) {
			return _cache[getCacheKey(url, query, method)];
		}
		this.clearCache = function () {
			_cache = {};
		};
		function doLoad(kwArgs, http, url, query, useCache) {
			if (((http.status >= 200) && (http.status < 300)) || (http.status == 304) || (http.status == 1223) || (location.protocol == "file:" && (http.status == 0 || http.status == undefined)) || (location.protocol == "chrome:" && (http.status == 0 || http.status == undefined))) {
				var ret;
				if (kwArgs.method.toLowerCase() == "head") {
					var headers = http.getAllResponseHeaders();
					ret = {};
					ret.toString = function () {
						return headers;
					};
					var values = headers.split(/[\r\n]+/g);
					for (var i = 0; i < values.length; i++) {
						var pair = values[i].match(/^([^:]+)\s*:\s*(.+)$/i);
						if (pair) {
							ret[pair[1]] = pair[2];
						}
					}
				} else {
					if (kwArgs.mimetype == "text/javascript") {
						try {
							ret = dj_eval(http.responseText);
						}
						catch (e) {
							dojo.debug(e);
							dojo.debug(http.responseText);
							ret = null;
						}
					} else {
						if (kwArgs.mimetype.substr(0, 9) == "text/json" || kwArgs.mimetype.substr(0, 16) == "application/json") {
							try {
								ret = dj_eval("(" + kwArgs.jsonFilter(http.responseText) + ")");
							}
							catch (e) {
								dojo.debug(e);
								dojo.debug(http.responseText);
								ret = false;
							}
						} else {
							if ((kwArgs.mimetype == "application/xml") || (kwArgs.mimetype == "text/xml")) {
								ret = http.responseXML;
								if (!ret || typeof ret == "string" || !http.getResponseHeader("Content-Type")) {
									ret = dojo.dom.createDocumentFromText(http.responseText);
								}
							} else {