<form className="slds-form--inline slds-grid slds-nowrap slds-grid--pull-padded">
    <div className="slds-form-element slds-size--5-of-6">
        <label className="slds-form-element__label" htmlFor="plugin-url-input">From URL</label>
        <div className="slds-form-element__control">
            <input className="slds-input" id="plugin-url-input" ref="pluginUrl" type="text" name="plugin-url"
                   placeholder="http://my-page.com/myPlugin.js"
                   defaultValue="plugins/TestWidgetPlugin.js"
            />
        </div>
    </div>
    <div className="slds-form-element  slds-size--1-of-6">
        <button className="slds-button slds-button--brand" onClick={() => props.loadPlugin(this.refs.pluginUrl.value)}
             tabIndex="0">
            Load Plugin
        </button>
    </div>
</form>