title: Clear textfield based onchanged (flutter)
body: <pre><code>TextField(
      inputFormatters: [
       new FilteringTextInputFormatter.allow(
       RegExp('[0-9]')),
      ],
      hintText: 'some text'
      title: '',
      editingController: controllers[31],
      value: somenumber,
      onChange: (value) {
        if (num.parse(value) &lt;= 3000 &amp;&amp;
          num.parse(value) &gt;= 30) {
          // save some data
        }else{
        controllers[31].clear(),
       },
     ),
  </code></pre>
  <p>so above is a textfield with onchange, right now the textfield does not clear if i put outside of the range, is it possible to clear the textfield based onchange?</p>