07d333cc79
git-svn-id: http://svn.openlayers.org/tags/openlayers/release-2.4-rc4@3178 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
323 lines
9.2 KiB
JavaScript
323 lines
9.2 KiB
JavaScript
/* Copyright (c) 2006 MetaCarta, Inc., published under the BSD license.
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* See http://svn.openlayers.org/trunk/openlayers/release-license.txt
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* for the full text of the license. */
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OpenLayers.ProxyHost = "";
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//OpenLayers.ProxyHost = "examples/proxy.cgi?url=";
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/**
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* Ajax reader for OpenLayers
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*
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*@uri url to do remote XML http get
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*@param 'get' format params (x=y&a=b...)
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*@who object to handle callbacks for this request
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*@complete the function to be called on success
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*@failure the function to be called on failure
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*
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* example usage from a caller:
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*
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* caps: function(request) {
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* -blah-
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* },
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*
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* OpenLayers.loadURL(url,params,this,caps);
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*
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* Notice the above example does not provide an error handler; a default empty
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* handler is provided which merely logs the error if a failure handler is not
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* supplied
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*
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*/
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/**
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* @param {} request
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*/
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OpenLayers.nullHandler = function(request) {
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alert("Unhandled request return " + request.statusText);
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};
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/** Background load a document
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*
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* @param {String} uri URI of source doc
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* @param {String} params Params on get (doesnt seem to work)
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* @param {Object} caller object which gets callbacks
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* @param {Function} onComplete callback for success
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* @param {Function} onFailure callback for failure
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*
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* Both callbacks optional (though silly)
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*/
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OpenLayers.loadURL = function(uri, params, caller,
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onComplete, onFailure) {
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if (OpenLayers.ProxyHost && uri.startsWith("http")) {
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uri = OpenLayers.ProxyHost + escape(uri);
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}
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var success = (onComplete) ? onComplete.bind(caller)
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: OpenLayers.nullHandler;
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var failure = (onFailure) ? onFailure.bind(caller)
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: OpenLayers.nullHandler;
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// from prototype.js
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new OpenLayers.Ajax.Request(uri,
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{ method: 'get',
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parameters: params,
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onComplete: success,
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onFailure: failure
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}
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);
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};
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/** Parse XML into a doc structure
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* @param {String} text
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*
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* @returns Parsed Ajax Response ??
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* @type ?
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*/
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OpenLayers.parseXMLString = function(text) {
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//MS sucks, if the server is bad it dies
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var index = text.indexOf('<');
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if (index > 0) {
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text = text.substring(index);
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}
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var ajaxResponse = OpenLayers.Util.Try(
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function() {
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var xmldom = new ActiveXObject('Microsoft.XMLDOM');
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xmldom.loadXML(text);
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return xmldom;
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},
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function() {
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return new DOMParser().parseFromString(text, 'text/xml');
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},
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function() {
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var req = new XMLHttpRequest();
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req.open("GET", "data:" + "text/xml" +
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";charset=utf-8," + encodeURIComponent(text), false);
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if (req.overrideMimeType) {
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req.overrideMimeType("text/xml");
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}
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req.send(null);
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return req.responseXML;
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}
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);
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return ajaxResponse;
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};
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OpenLayers.Ajax = {
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emptyFunction: function () {},
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getTransport: function() {
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return OpenLayers.Util.Try(
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function() {return new ActiveXObject('Msxml2.XMLHTTP')},
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function() {return new ActiveXObject('Microsoft.XMLHTTP')},
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function() {return new XMLHttpRequest()}
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) || false;
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},
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activeRequestCount: 0
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};
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OpenLayers.Ajax.Responders = {
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responders: [],
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register: function(responderToAdd) {
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for (var i = 0; i < this.responders.length; i++)
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if (responderToAdd == this.responders[i])
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return;
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this.responders.push(responderToAdd);
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},
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dispatch: function(callback, request, transport, json) {
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for (var i = 0; i < this.responders.length; i++) {
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responder = this.responders[i];
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if (responder[callback] && typeof responder[callback] == 'function') {
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try {
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responder[callback].apply(responder, [request, transport, json]);
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} catch (e) {}
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}
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}
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}
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};
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OpenLayers.Ajax.Responders.register({
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onCreate: function() {
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OpenLayers.Ajax.activeRequestCount++;
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},
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onComplete: function() {
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OpenLayers.Ajax.activeRequestCount--;
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}
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});
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OpenLayers.Ajax.Base = function() {};
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OpenLayers.Ajax.Base.prototype = {
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setOptions: function(options) {
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this.options = {
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method: 'post',
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asynchronous: true,
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parameters: ''
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}
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OpenLayers.Util.extend(this.options, options || {});
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},
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responseIsSuccess: function() {
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return this.transport.status == undefined
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|| this.transport.status == 0
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|| (this.transport.status >= 200 && this.transport.status < 300);
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},
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responseIsFailure: function() {
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return !this.responseIsSuccess();
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}
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}
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OpenLayers.Ajax.Request = OpenLayers.Class.create();
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OpenLayers.Ajax.Request.Events =
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['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];
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OpenLayers.Ajax.Request.prototype = OpenLayers.Class.inherit( OpenLayers.Ajax.Base, {
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initialize: function(url, options) {
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this.transport = OpenLayers.Ajax.getTransport();
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this.setOptions(options);
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this.request(url);
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},
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request: function(url) {
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var parameters = this.options.parameters || '';
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if (parameters.length > 0) parameters += '&_=';
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try {
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this.url = url;
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if (this.options.method == 'get' && parameters.length > 0)
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this.url += (this.url.match(/\?/) ? '&' : '?') + parameters;
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OpenLayers.Ajax.Responders.dispatch('onCreate', this, this.transport);
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this.transport.open(this.options.method, this.url,
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this.options.asynchronous);
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if (this.options.asynchronous) {
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this.transport.onreadystatechange = this.onStateChange.bind(this);
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setTimeout((function() {this.respondToReadyState(1)}).bind(this), 10);
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}
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this.setRequestHeaders();
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var body = this.options.postBody ? this.options.postBody : parameters;
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this.transport.send(this.options.method == 'post' ? body : null);
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} catch (e) {
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this.dispatchException(e);
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}
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},
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setRequestHeaders: function() {
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var requestHeaders =
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['X-Requested-With', 'XMLHttpRequest',
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'X-Prototype-Version', 'OpenLayers'];
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if (this.options.method == 'post' && !this.options.postBody) {
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requestHeaders.push('Content-type',
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'application/x-www-form-urlencoded');
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/* Force "Connection: close" for Mozilla browsers to work around
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* a bug where XMLHttpReqeuest sends an incorrect Content-length
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* header. See Mozilla Bugzilla #246651.
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*/
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if (this.transport.overrideMimeType)
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requestHeaders.push('Connection', 'close');
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}
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if (this.options.requestHeaders)
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requestHeaders.push.apply(requestHeaders, this.options.requestHeaders);
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for (var i = 0; i < requestHeaders.length; i += 2)
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this.transport.setRequestHeader(requestHeaders[i], requestHeaders[i+1]);
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},
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onStateChange: function() {
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var readyState = this.transport.readyState;
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if (readyState != 1)
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this.respondToReadyState(this.transport.readyState);
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},
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header: function(name) {
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try {
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return this.transport.getResponseHeader(name);
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} catch (e) {}
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},
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evalJSON: function() {
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try {
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return eval(this.header('X-JSON'));
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} catch (e) {}
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},
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evalResponse: function() {
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try {
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return eval(this.transport.responseText);
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} catch (e) {
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this.dispatchException(e);
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}
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},
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respondToReadyState: function(readyState) {
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var event = OpenLayers.Ajax.Request.Events[readyState];
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var transport = this.transport, json = this.evalJSON();
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if (event == 'Complete') {
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try {
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(this.options['on' + this.transport.status]
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|| this.options['on' + (this.responseIsSuccess() ? 'Success' : 'Failure')]
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|| OpenLayers.Ajax.emptyFunction)(transport, json);
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} catch (e) {
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this.dispatchException(e);
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}
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if ((this.header('Content-type') || '').match(/^text\/javascript/i))
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this.evalResponse();
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}
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try {
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(this.options['on' + event] || OpenLayers.Ajax.emptyFunction)(transport, json);
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OpenLayers.Ajax.Responders.dispatch('on' + event, this, transport, json);
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} catch (e) {
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this.dispatchException(e);
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}
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/* Avoid memory leak in MSIE: clean up the oncomplete event handler */
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if (event == 'Complete')
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this.transport.onreadystatechange = OpenLayers.Ajax.emptyFunction;
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},
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dispatchException: function(exception) {
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(this.options.onException || OpenLayers.Ajax.emptyFunction)(this, exception);
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OpenLayers.Ajax.Responders.dispatch('onException', this, exception);
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}
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});
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OpenLayers.Ajax.getElementsByTagNameNS = function(parentnode, nsuri, nsprefix, tagname) {
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return parentnode.getElementsByTagNameNS ?
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parentnode.getElementsByTagNameNS(nsuri, tagname)
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: parentnode.getElementsByTagName(nsprefix + ':' + tagname);
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}
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/**
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* Wrapper function around XMLSerializer, which doesn't exist/work in
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* IE/Safari. We need to come up with a way to serialize in those browser:
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* for now, these browsers will just fail.
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* #535, #536
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*
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* @param {XMLNode} xmldom xml dom to serialize
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*/
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OpenLayers.Ajax.serializeXMLToString = function(xmldom) {
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var serializer = new XMLSerializer();
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data = serializer.serializeToString(xmldom);
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return data;
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}
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