如何验证空格/空格?[角2] [英] How to validate white spaces/empty spaces? [Angular 2]

问题描述

我想避免在我的 angular 2 形式中出现空格/空格?是否可以?这怎么办?

I would like to avoid white spaces/empty spaces in my angular 2 form? Is it possible? How can this be done?

推荐答案

也许这篇文章可以帮到你 http://blog.angular-university.io/introduction-to-angular-2-forms-template-driven-vs-model-driven/

Maybe this article can help you http://blog.angular-university.io/introduction-to-angular-2-forms-template-driven-vs-model-driven/

在这种方法中，您必须使用 FormControl，然后观察值的变化，然后将掩码应用于该值.一个例子应该是:

In this approach, you have to use FormControl then watch for value changes and then apply your mask to the value. An example should be:

...
form: FormGroup;
...


ngOnInit(){
    this.form.valueChanges
            .map((value) => {
                // Here you can manipulate your value
                value.firstName = value.firstName.trim();
                return value;
            })
            .filter((value) => this.form.valid)
            .subscribe((value) => {
               console.log("Model Driven Form valid value: vm = ",JSON.stringify(value));
            });

}

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