1 <!DOCTYPE html><html><head><title>Sencha Documentation Project</title><link rel="stylesheet" href="../reset.css" type="text/css"><link rel="stylesheet" href="../prettify.css" type="text/css"><link rel="stylesheet" href="../prettify_sa.css" type="text/css"><script type="text/javascript" src="../prettify.js"></script></head><body onload="prettyPrint()"><pre class="prettyprint"><pre><span id='Ext-data.reader.Xml'>/**
2 </span> * @author Ed Spencer
3 * @class Ext.data.reader.Xml
4 * @extends Ext.data.reader.Reader
6 * <p>The XML Reader is used by a Proxy to read a server response that is sent back in XML format. This usually
7 * happens as a result of loading a Store - for example we might create something like this:</p>
9 <pre><code>
11 extend: 'Ext.data.Model',
12 fields: ['id', 'name', 'email']
15 var store = new Ext.data.Store({
26 </code></pre>
28 * <p>The example above creates a 'User' model. Models are explained in the {@link Ext.data.Model Model} docs if you're
29 * not already familiar with them.</p>
31 * <p>We created the simplest type of XML Reader possible by simply telling our {@link Ext.data.Store Store}'s
32 * {@link Ext.data.proxy.Proxy Proxy} that we want a XML Reader. The Store automatically passes the configured model to the
33 * Store, so it is as if we passed this instead:
35 <pre><code>
41 </code></pre>
43 * <p>The reader we set up is ready to read data from our server - at the moment it will accept a response like this:</p>
45 <pre><code>
46 &lt;?xml version="1.0" encoding="UTF-8"?&gt;
48 &lt;id&gt;1&lt;/id&gt;
49 &lt;name&gt;Ed Spencer&lt;/name&gt;
50 &lt;email&gt;ed@sencha.com&lt;/email&gt;
53 &lt;id&gt;2&lt;/id&gt;
54 &lt;name&gt;Abe Elias&lt;/name&gt;
55 &lt;email&gt;abe@sencha.com&lt;/email&gt;
57 </code></pre>
59 * <p>The XML Reader uses the configured {@link #record} option to pull out the data for each record - in this case we
60 * set record to 'user', so each &lt;user&gt; above will be converted into a User model.</p>
62 * <p><u>Reading other XML formats</u></p>
64 * <p>If you already have your XML format defined and it doesn't look quite like what we have above, you can usually
65 * pass XmlReader a couple of configuration options to make it parse your format. For example, we can use the
66 * {@link #root} configuration to parse data that comes back like this:</p>
68 <pre><code>
69 &lt;?xml version="1.0" encoding="UTF-8"?&gt;
72 &lt;id&gt;1&lt;/id&gt;
73 &lt;name&gt;Ed Spencer&lt;/name&gt;
74 &lt;email&gt;ed@sencha.com&lt;/email&gt;
77 &lt;id&gt;2&lt;/id&gt;
78 &lt;name&gt;Abe Elias&lt;/name&gt;
79 &lt;email&gt;abe@sencha.com&lt;/email&gt;
81 &lt;/users&gt;
82 </code></pre>
84 * <p>To parse this we just pass in a {@link #root} configuration that matches the 'users' above:</p>
86 <pre><code>
92 </code></pre>
94 * <p>Note that XmlReader doesn't care whether your {@link #root} and {@link #record} elements are nested deep inside
95 * a larger structure, so a response like this will still work:
97 <pre><code>
98 &lt;?xml version="1.0" encoding="UTF-8"?&gt;
99 &lt;deeply&gt;
100 &lt;nested&gt;
102 &lt;users&gt;
104 &lt;id&gt;1&lt;/id&gt;
105 &lt;name&gt;Ed Spencer&lt;/name&gt;
106 &lt;email&gt;ed@sencha.com&lt;/email&gt;
107 &lt;/user&gt;
109 &lt;id&gt;2&lt;/id&gt;
110 &lt;name&gt;Abe Elias&lt;/name&gt;
111 &lt;email&gt;abe@sencha.com&lt;/email&gt;
112 &lt;/user&gt;
113 &lt;/users&gt;
115 &lt;/nested&gt;
116 &lt;/deeply&gt;
117 </code></pre>
119 * <p><u>Response metadata</u></p>
121 * <p>The server can return additional data in its response, such as the {@link #totalProperty total number of records}
122 * and the {@link #successProperty success status of the response}. These are typically included in the XML response
123 * like this:</p>
125 <pre><code>
126 &lt;?xml version="1.0" encoding="UTF-8"?&gt;
127 &lt;total&gt;100&lt;/total&gt;
128 &lt;success&gt;true&lt;/success&gt;
129 &lt;users&gt;
131 &lt;id&gt;1&lt;/id&gt;
132 &lt;name&gt;Ed Spencer&lt;/name&gt;
133 &lt;email&gt;ed@sencha.com&lt;/email&gt;
134 &lt;/user&gt;
136 &lt;id&gt;2&lt;/id&gt;
137 &lt;name&gt;Abe Elias&lt;/name&gt;
138 &lt;email&gt;abe@sencha.com&lt;/email&gt;
139 &lt;/user&gt;
140 &lt;/users&gt;
141 </code></pre>
143 * <p>If these properties are present in the XML response they can be parsed out by the XmlReader and used by the
144 * Store that loaded it. We can set up the names of these properties by specifying a final pair of configuration
147 <pre><code>
151 totalProperty : 'total',
152 successProperty: 'success'
154 </code></pre>
156 * <p>These final options are not necessary to make the Reader work, but can be useful when the server needs to report
157 * an error or if it needs to indicate that there is a lot of data available of which only a subset is currently being
158 * returned.</p>
160 * <p><u>Response format</u></p>
162 * <p><b>Note:</b> in order for the browser to parse a returned XML document, the Content-Type header in the HTTP
163 * response must be set to "text/xml" or "application/xml". This is very important - the XmlReader will not
164 * work correctly otherwise.</p>
166 Ext.define('Ext.data.reader.Xml', {
167 extend: 'Ext.data.reader.Reader',
168 alternateClassName: 'Ext.data.XmlReader',
169 alias : 'reader.xml',
171 <span id='Ext-data.reader.Xml-property-'> /**
173 * Creates a function to return some particular key of data from a response. The totalProperty and
174 * successProperty are treated as special cases for type casting, everything else is just a simple selector.
175 * @param {String} key
179 <span id='Ext-data.reader.Xml-cfg-record'> /**
180 </span> * @cfg {String} record The DomQuery path to the repeated element which contains record information.
183 createAccessor: function() {
184 var selectValue = function(expr, root){
185 var node = Ext.DomQuery.selectNode(expr, root),
192 return function(expr) {
195 if (Ext.isEmpty(expr)) {
199 if (Ext.isFunction(expr)) {
203 return function(root) {
204 var node = Ext.DomQuery.selectNode(expr, root),
205 val = me.getNodeValue(node);
207 return Ext.isEmpty(val) ? null : val;
212 getNodeValue: function(node) {
214 if (node && node.firstChild) {
215 val = node.firstChild.nodeValue;
221 getResponseData: function(response) {
222 var xml = response.responseXML;
228 msg: 'XML data not found in the response'
236 <span id='Ext-data.reader.Xml-method-getData'> /**
237 </span> * Normalizes the data object
238 * @param {Object} data The raw data object
239 * @return {Object} Returns the documentElement property of the data object if present, or the same object if not
241 getData: function(data) {
242 return data.documentElement || data;
245 <span id='Ext-data.reader.Xml-method-getRoot'> /**
247 * Given an XML object, returns the Element that represents the root as configured by the Reader's meta data
248 * @param {Object} data The XML data object
249 * @return {Element} The root node element
251 getRoot: function(data) {
252 var nodeName = data.nodeName,
255 if (!root || (nodeName && nodeName == root)) {
257 } else if (Ext.DomQuery.isXml(data)) {
258 // This fix ensures we have XML data
259 // Related to TreeStore calling getRoot with the root node, which isn't XML
260 // Probably should be resolved in TreeStore at some point
261 return Ext.DomQuery.selectNode(root, data);
265 <span id='Ext-data.reader.Xml-method-extractData'> /**
267 * We're just preparing the data for the superclass by pulling out the record nodes we want
268 * @param {Element} root The XML root node
269 * @return {Array} The records
271 extractData: function(root) {
272 var recordName = this.record;
276 Ext.Error.raise('Record is a required parameter');
280 if (recordName != root.nodeName) {
281 root = Ext.DomQuery.select(recordName, root);
285 return this.callParent([root]);
288 <span id='Ext-data.reader.Xml-method-getAssociatedDataRoot'> /**
290 * See Ext.data.reader.Reader's getAssociatedDataRoot docs
291 * @param {Mixed} data The raw data object
292 * @param {String} associationName The name of the association to get data for (uses associationKey if present)
293 * @return {Mixed} The root
295 getAssociatedDataRoot: function(data, associationName) {
296 return Ext.DomQuery.select(associationName, data)[0];
299 <span id='Ext-data.reader.Xml-method-readRecords'> /**
300 </span> * Parses an XML document and returns a ResultSet containing the model instances
301 * @param {Object} doc Parsed XML document
302 * @return {Ext.data.ResultSet} The parsed result set
304 readRecords: function(doc) {
305 //it's possible that we get passed an array here by associations. Make sure we strip that out (see Ext.data.reader.Reader#readAssociated)
306 if (Ext.isArray(doc)) {
310 <span id='Ext-data.reader.Xml-property-xmlData'> /**
311 </span> * DEPRECATED - will be removed in Ext JS 5.0. This is just a copy of this.rawData - use that instead
316 return this.callParent([doc]);
319 </pre></pre></body></html>