我的表单 HTML 中的必填字段不起作用

Question

我创建了一个带有必填字段的in HTML，然后创建了一个带有ng-click=add()的Submit按钮。

代码如下:

输入名称:

<div class="mb-3">
<label class="form-label">Enter surname:</label>
<input type="text" class="form-control" placeholder="Person surname" ng-model= "newPerson.surname" required>
</div>

<div class="mb-3">
<label class="form-label">Enter age:</label>
<input type="text" class="form-control" placeholder="Person age" ng-model= "newPerson.age" required>
</div>
<div class="mb-3">
<label class="form-label">Enter occupation:</label>
<input type="text" class="form-control" placeholder="Person occupation" ng-model= "newPerson.occupation" required>
</div>

<button type="submit" class="btn btn-primary" ng-click="add()">Add</button>

</form>

当按下按钮时，它添加了人，然后它告诉我字段是必需的，但在我的列表中，人已经存在，将有未定义的值。

我已经在文档的顶部声明了。

感谢

Answer 1

您也可以使用验证方法来验证提交时的输入，而不是必需的。示例

public validateForm() {
if(newPerson.surname === null || 
newPerson.surname === undefined || newPerson.surname === " ")
{
error.surname = "Surname is required";
}
if(newPerson.age === null || 
newPerson.age === undefined || newPerson.age === " ")
{
error.age = "Age is required";
}
if(newPerson.occupation === null || 
newPerson.occupation === undefined || newPerson.occupation === " ")
{
error.occupation = "Occupation is required";
}

if(newPerson.surname !== null || 
newPerson.surname !== undefined || newPerson.surname !== " " ||
newPerson.age !== null || 
newPerson.age !== undefined || newPerson.age !== " " ||
newPerson.occupation !== null || 
newPerson.occupation !== undefined || newPerson.occupation !== "
)
{
this.add();
}
}

<div class="mb-3">
<label class="form-label">Enter surname:</label>
<input type="text" class="form-control" placeholder="Person surname" ng-model= "newPerson.surname" required>
</div>
<span *ngIf="error.surname"> {{error.surname}}</span>
<div class="mb-3">
<label class="form-label">Enter age:</label>
<input type="text" class="form-control" placeholder="Person age" ng-model= "newPerson.age" required>
</div>
<span *ngIf="error.age"> {{error.age}}</span>
<div class="mb-3">
<label class="form-label">Enter occupation:</label>
<input type="text" class="form-control" placeholder="Person occupation" ng-model= "newPerson.occupation" required>
</div>
<span *ngIf="error.occupation"> {{error.occupation}}</span>
<button type="submit" class="btn btn-primary" ng-click="validateForm()">Add</button>

</form>