Mobx - 如何跟踪动态表单输入的深层变化?

时间:2017-04-20 09:56:02

标签: typescript mobx mobx-react

我在表格上需要它。 我的表单在数据提交中是这样的:

const initial = {
    name "",
    surname: "",
    adresses: new Array()  <- this give me  warning when array empty *
}

我的地址是对象数组,其中我有一些标准属性,我可以使用extendObservable添加新的属性 地址类型{state:&#39;&#39;,town:&#39;&#39; }

extendObservable(this.props.data['adresses'][i], { [keyName]: '' });

我的问题是,使用extendObservable向地址添加新属性我没有看到(观察)live的任何变化,但是如果在执行extendObservable之后,我更新了state的值,我可以看到新添加的属性。为什么我没有看到新属性我将其添加到地址?

我的商店是这个(打字稿):

const initial = {
   namel: "",
    surname: "",
    addresses: new Array()
}

export class formStore {
    constructor() {
        this.formData = initial
    }
    @observable formData: {
        [index: string]: any,
        name: string,
        surname: string,
        addresses: any[]
    };
    @action updatePropertyForm(key: string, value: any) {
        this.formData[key] = value;
    }

    @action updatePropertyAddresses(key: string, value: string, i: number) {
        this.formData.addresses[i][key] = value;
    }

    @action initializeFormData(data: any) {
        this.formData = data;
    }

     @action addEmptyAddress() {
        const emptyAddress = {
            state: "",
            townl: "",
        }
        this.formData['addresses'].push(emptyAddress);
    }

    @action addPropertyToAddresses(_keyName: string) {
        const length = this.formData['addresses'].length;
        for (var i = 0; i < length; i++) {
            let keyName = _keyName
            keyName = keyName.replace(/\s/g, '')
            keyName = toLowerChar(keyName);
            extendObservable(this.formData['addresses'][i], { [keyName]: '' });
        }
    }    

    @action removePropetyFromAddresses(_keyName: string) {
        const length = this.formData['addresses'].length;
            for (var i = 0; i < length; i++) {
                let keyName = _keyName
                delete this.formData['addresses'][i][keyName];
            }
    }
}

通过调用添加或删除我必须更新其他属性之一,所以我可以看到我添加的新属性。 当我放置新房产时如何观察它?

1 个答案:

答案 0 :(得分:2)

正如文档中所述can only observe objects properties which exist during observer init

如果你想观察一个动态键控对象(作为你的地址对象),你必须使用asMap修饰符(或者像我在我的例子中那样直接使用mobx.map)

像这样:

// add a first addresse
store.addresses.push(mobx.observable.map({town: "Stormwind", street: "Dwarf lane"}));

// add a props to the first addresse
store.addresses[0].set("number", 2);

这是一个有效的例子。

https://jsbin.com/lasudor/2/edit?js,console