使用Angular,如何在两个函数之间切换?

时间:2017-12-13 12:48:22

标签: javascript angular

我正在创建一个购物清单应用程序,每行都有食品名称。左列显示不需要的项目,右列显示所需的项目。目前,我可以通过单击每列来更改状态。但是,我想在这两个函数之间切换,以便通过单击像现在这样的列或只是行来切换状态。

HTML:

<ion-row id="test" (press)="delete(list)">
    <ion-col class="offFoods" [ngClass]="{'grey-out': list.state == 'on'}" (tap)="additem(list)">
        {{list.foodname}}
    </ion-col>
    <ion-col  class="onFoods" [ngClass]="{'grey-out': list.state == 'off'}" (tap)="unlist(list)">
        {{list.foodname}}
    </ion-col>
</ion-row>

这些功能的TS:

additem(list) {
    var listkey = this.listKey;
    var customlistData = {
      category: list.category,
      foodname: list.foodname,
      state: "on",
    };

    var user = firebase.auth().currentUser;
    var uid = user.uid;

    var foodid = list.$key;//Must click Banana

    if(this.plt.is('ios')) {
      this.taptic.selection();
      }
    if (this.plt.is('android')) {
        this.vibration.vibrate(75);
      }
    return firebase.database().ref('userlists' + '/' + listkey +  '/' + 'list' + '/' + foodid).set(customlistData);

}

unlist(list) {
    var listkey = this.listKey;
    var customlistData = {
      category: list.category,
      foodname: list.foodname,
      state: "off",
    };

    var user = firebase.auth().currentUser;
    var uid = user.uid;

    var foodid = list.$key;//Must click Banana

    if(this.plt.is('ios')) {
      this.taptic.selection();
      }
    if (this.plt.is('android')) {
        this.vibration.vibrate(75);
      }
    return firebase.database().ref('userlists' + '/' + listkey +  '/' + 'list' + '/' + foodid).set(customlistData);
}

2 个答案:

答案 0 :(得分:2)

由于列表作为参数传递,因此您可以引用当前状态并将其切换为:

additem(list) {
var listkey = this.listKey;
var customlistData = {
  category: list.category,
  foodname: list.foodname,
  state: (list.state=="off")?"on":"off,
};

...

}

甚至可以将此函数重命名为toggleItem(list),然后将其移动到父行div:

<ion-row id="test" (press)="delete(list)" (tap)="toggleItem(list)">
...
</ion-row>

答案 1 :(得分:0)

您可以创建第三个参数或布尔数组来指示列表中每个项目的状态。

然后使用一个通用函数来操纵使用哪个函数。

   changeFoodState(itemIndex: number)
   {
      if(state[itemIndex]){
         additem(list[itemIndex])
      }else {
         unlist(list[itemIndex])
      }
   }