如何在下面的代码中为表单元素制作关联标签?
render() {
return (
<section className="col">
<div className="input-group">
<input type="text"
id="search-input"
ref="searchInput"
className="form-control"
placeholder="Filter location..."
onChange={this.handleChange} />
<span className="input-group-addon">Filter</span>
</div>
</section>
)
}