EditTest.jsx

EditPrintList = React.createClass({
  mixins: [ReactMeteorData],
  getMeteorData() {
    let data            = {},
        printListHandle = Meteor.subscribe('print-lists', [FlowRouter.getParam('listId')], () => {
          let printList = PrintLists.findOne({ _id: FlowRouter.getParam('listId') });
          this.setState({
            selectedLabel: printList.label
          });
        }),
        labelsHandle    = Meteor.subscribe('labels'),
        templatesHandle = Meteor.subscribe('templates-for-label', this.state.selectedLabel);

    data.isLoading = !printListHandle.ready() || !labelsHandle.ready();
    data.printList = PrintLists.findOne({ _id: FlowRouter.getParam('listId') });
    data.labels    = Labels.find({}).fetch();
    data.templates = Templates.find({ label: this.state.selectedLabel }).fetch();
    return data;
  },
  getInitialState() {
    return {
      selectedLabel: null
    };
  },
  componentDidMount() {
    Modules.client.editPrintList({ form: '#editPrintList' });
  },
  handleSubmit(event) {
    event.preventDefault();
  },
  labelSelected(event) {
    let labelId = event.target.value;
    this.setState({
      selectedLabel: labelId
    });
  },
  renderLabelList() {
    return this.data.labels.map((label) => {
      return <option key={label._id} value={label._id}>{label.name}</option>;
    });
  },
  renderTemplateList() {
    return this.data.templates.map((template) => {
      return <option key={template._id} value={template._id}>{template.name}</option>;
    });
  },
  render() {
    let renderForm = () => {
      if (this.data.isLoading) {
        return <Loading />;
      } else {
        return (
          <div>
            <div className="form-group">
              <label className="col-sm-2 control-label" htmlFor="name">Name</label>
              <div className="col-sm-8">
                <input type="text" className="form-control" name="name" id="name"
                       defaultValue={this.data.printList.name}/>
              </div>
            </div>
            <div className="form-group">
              <label className="col-sm-2 control-label" htmlFor="label">Label</label>
              <div className="col-sm-8">
                <select className="form-control" name="label" id="label" onChange={this.labelSelected}
                        defaultValue={this.data.printList.label}>
                  {this.renderLabelList()}
                </select>
              </div>
              <div className="col-sm-2">
                <button className="btn btn-block btn-planglow-pink" type="button">Choose Label</button>
              </div>
            </div>
            <div className="form-group">
              <label className="col-sm-2 control-label" htmlFor="template">Default Template</label>
              <div className="col-sm-8">
                <select className="form-control" name="template" id="template"
                        defaultValue={this.data.printList.template}>
                  {this.renderTemplateList()}
                </select>
              </div>
              <div className="col-sm-2">
                <button className="btn btn-block btn-planglow-pink" type="button">Choose Template</button>
              </div>
            </div>
            <div className="form-group">
              <div className="col-sm-8 col-sm-offset-2">
                <div className="checkbox">
                  <label>
                    <input id="override" name="override" type="checkbox"/>
                    Override existing template choices
                  </label>
                </div>
              </div>
            </div>
            <div className="form-group">
              <div className="col-sm-offset-2 col-sm-8">
                <input type="submit" className="btn btn-primary" value="Save"/>
              </div>
            </div>
          </div>
        )
      }
    };

    return (
      <div>
        <div className="row">
          <div className="col-lg-12">
            <h1 className="page-header">
              Edit Print List
            </h1>
          </div>
        </div>
        <form id="editPrintList" className="form-horizontal" onSubmit={this.handleSubmit}>
          {renderForm()}
        </form>
      </div>
    );
  }
});

Realised that the jQuery Validation needed to be able to find the

immediately, hence the new renderForm() function.