Question

我正在尝试制作一个控件，我们可以输入带有标签和分数的多个玩家。

但是当我们点击我的AddPlayer按钮时，我创建了一个播放器，然后我需要将表单控件值重置为默认值。

我尝试了很多东西，但没有任何作用......它永远不会改变视图值。

以下是代码：

addPlayer(form: ControlGroup) {
    var player = new Player();
    player.tag = form.value.tag;
    player.name = form.value.name;
    player.score = form.value.score;

    // nothing work
    form.value = null;
    form.value.tag = null;
    form.value.tag = '';

    this.playerService.addPlayer(player.tag, player.name, player.score);
    this.newplayer.next(player);
}

这是html

<form (submit)="addPlayer(playerForm)" [ng-form-model]="playerForm">
    <div class="form-group" [class.has-error]="!playerForm.find('tag').valid && playerForm.find('tag').touched">
        <div class="col-md-3 text-right">
            <label for="tag">Tag: </label>
        </div>

        <input type="text" id="tag" #tag="form" [ng-form-control]="playerForm.controls['tag']"  placeholder="Tag"/>

        <span *ng-if="tag.control.hasError('required') && !tag.control.pristine">Tag is required</span>
    </div>

    <div class="form-group" [class.has-error]="!playerForm.find('name').valid && playerForm.find('name').touched">
        <div class="col-md-3 text-right">
            <label for="name">Player Name: </label>
        </div>

        <input type="text" id="name" #name="form" [ng-form-control]="playerForm.controls['name']" placeholder="Player Name" />

        <span *ng-if="name.control.hasError('required') && !name.control.pristine">Player Name is required</span>
    </div>

    <div class="form-group" [class.has-error]="!playerForm.find('score').valid && playerForm.find('score').touched">
        <div class="col-md-3 text-right">
            <label for="score">Score: </label>
        </div>

        <input type="number" id="score" #score="form" [ng-form-control]="playerForm.controls['score']" value="0" min="0" max="200" />

        <span *ng-if="score.control.hasError('required') && !score.control.pristine">Score is required</span>
    </div>

    <button type="submit" class="btn btn-primary">
        Add Player
    </button>
</form>

那么如何重置控件的值？

Answer 1

要重置表单，最简单的方法是重建表单生成器。单击添加播放器按钮

this.playerForm = this.builder.group({
        'name': [...],
        'tag': [...],
        'score': [...]
    });

Answer 2

for(let c in form.controls) {
    form.controls[c].updateValue('');
};

Answer 3

根据angular 2 docs，看起来updateValue有一些params，比如self和emitEvent似乎处理验证重置。你试过了吗？

如何重置控制值？

3 个答案: