角度|反应形式：无法从单选按钮获取值

Question

我无法以反应形式从单选按钮获得价值。它总是空字符串。我该如何解决？以下是该代码：

<form (ngSubmit)="onSubmit(segment_abc)" [formGroup]="segment_abc">
<div class="container">
    <div class="row product-chooser">
        <div class="col-md-4 col-sm-6 selected product-chooser-item" id="div1" tabindex="-1">
            <div class="pricingTable">

                            <i class="fa fa-rupee"> 400</i><span class="gst"> + GST</span>
                            <input type="radio" formControlName="segment123" [value]=1>
                            <!-- <a href="#" class="pricingTable-signup">Subscribe Now</a> -->
                        </div>
                    </div>
                </div>
            </div>
        </div>
        <div class="col-md-4 col-sm-6  product-chooser-item" id="div2" tabindex="-1">
            <div class="pricingTable">


                    <div class="bottom">
                        <div class="txt_400">
                            <i class="fa fa-rupee"> 1000</i><span class="gst"> + GST</span>
                            <input type="radio" formControlName="segment123" [value]=2>
                            <!-- <a href="#" class="pricingTable-signup">Subscribe Now</a> -->
                        </div>
                    </div>
                </div>
            </div>
        </div>
        <div class="col-md-4 col-sm-6  product-chooser-item" id="div3" tabindex="-1">
            <div class="pricingTable pricingTablepremium">

                            <input type="radio" formControlName="segment123" [value]=3 (click)="openValue()">
                            <!-- <a href="#" class="pricingTable-signup">Subscribe Now</a> -->
                        </div>
                    </div>
                </div>
            </div>
        </div>

    </div>

    </div>
    <!-- <button type="submit" class="btn btn_form" (click)="open(content,'email')">Submit</button> -->
    <button type="submit" class="btn btn_form" >Submit</button>
</div>

在表单控件中获取值时没有输出