反应：将值属性分配给组件的状态后，无法选择下拉菜单选项

Question

I have a React component that renders a dropdown menu.The component's state is updated when it receives props from its parent. I've set the 'value' attribute of the <'select> element to the state so that it re-renders when new props are received. This successfully re-renders the value in the dropdown menu when props are received but disables it from selecting a different option.

<select
      type="text"
      name="dogOwnerType"
      id="dogOwnerType"
      className="form-control"
      data-bv-field="dogOwnerType"
      value={this.state.dogOwnerType.ownerType}
    >
      <option value="">Choose Owner Type</option>
      <option value="DogLover">DogLover</option>
      <option value="DogOwner">DogOwner</option>
    </select>

Answer 1

To be able to change the value; you should add an onChange handler, which sets the new value to the state.

    // define function which sets new value to state
    updateOwnerType = event => {
        this.setState({
            dogOwnerType: { 
                ...this.state.dogOwnerType, 
                ownerType: event.target.value,
           })
    }

    {/* add your onChange handler to select element */}
    <select
          type="text"
          name="dogOwnerType"
          id="dogOwnerType"
          className="form-control"
          data-bv-field="dogOwnerType"
          onChange={this.updateOwnerType}
          value={this.state.dogOwnerType.ownerType}
        >