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  <pre class="prettyprint lang-js"><span id='Ext-data-writer-Json'>/**
</span> * @class Ext.data.writer.Json

This class is used to write {@link Ext.data.Model} data to the server in a JSON format.
The {@link #allowSingle} configuration can be set to false to force the records to always be
encoded in an array, even if there is only a single record being sent.

 * @markdown
 */
Ext.define('Ext.data.writer.Json', {
    extend: 'Ext.data.writer.Writer',
    alternateClassName: 'Ext.data.JsonWriter',
    alias: 'writer.json',
    
<span id='Ext-data-writer-Json-cfg-root'>    /**
</span>     * @cfg {String} root The key under which the records in this Writer will be placed. Defaults to &lt;tt&gt;undefined&lt;/tt&gt;.
     * Example generated request, using root: 'records':
&lt;pre&gt;&lt;code&gt;
{'records': [{name: 'my record'}, {name: 'another record'}]}
&lt;/code&gt;&lt;/pre&gt;
     */
    root: undefined,
    
<span id='Ext-data-writer-Json-cfg-encode'>    /**
</span>     * @cfg {Boolean} encode True to use Ext.encode() on the data before sending. Defaults to &lt;tt&gt;false&lt;/tt&gt;.
     * The encode option should only be set to true when a {@link #root} is defined, because the values will be
     * sent as part of the request parameters as opposed to a raw post. The root will be the name of the parameter
     * sent to the server.
     */
    encode: false,
    
<span id='Ext-data-writer-Json-cfg-allowSingle'>    /**
</span>     * @cfg {Boolean} allowSingle False to ensure that records are always wrapped in an array, even if there is only
     * one record being sent. When there is more than one record, they will always be encoded into an array.
     * Defaults to &lt;tt&gt;true&lt;/tt&gt;. Example:
     * &lt;pre&gt;&lt;code&gt;
// with allowSingle: true
&quot;root&quot;: {
    &quot;first&quot;: &quot;Mark&quot;,
    &quot;last&quot;: &quot;Corrigan&quot;
}

// with allowSingle: false
&quot;root&quot;: [{
    &quot;first&quot;: &quot;Mark&quot;,
    &quot;last&quot;: &quot;Corrigan&quot;
}]
     * &lt;/code&gt;&lt;/pre&gt;
     */
    allowSingle: true,
    
    //inherit docs
    writeRecords: function(request, data) {
        var root = this.root;
        
        if (this.allowSingle &amp;&amp; data.length == 1) {
            // convert to single object format
            data = data[0];
        }
        
        if (this.encode) {
            if (root) {
                // sending as a param, need to encode
                request.params[root] = Ext.encode(data);
            } else {
                //&lt;debug&gt;
                Ext.Error.raise('Must specify a root when using encode');
                //&lt;/debug&gt;
            }
        } else {
            // send as jsonData
            request.jsonData = request.jsonData || {};
            if (root) {
                request.jsonData[root] = data;
            } else {
                request.jsonData = data;
            }
        }
        return request;
    }
});
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