Angular 7表单验证和显示错误消息
请在Stackblitz中查看我的简单表单
Please look my simple form in Stackblitz
https://stackblitz.com/edit/angular-et9uww
如果我选择一个复选框，则我的表单将包含2个复选框，它将填充一个文本框.在我的方案中，我有2个复选框和2个文本框以及1个提交"按钮.
My form contains 2 checkboxes if I select one of the checkboxes it will populate one textbox. In my scenario, I have 2 checkboxes and 2 text boxes and one submit button.
注意-就我而言，我有n个复选框和子问题
NOTE- in my case i have n number of checkbox and child questions
验证包括-> 2个文本框是必需的
Validation includes -> 2 textbox are mandatory
如果用户提交表单时未输入文本框，则会显示错误消息.
If the user submits the form without entering textbox it will show the error message.
- 选中复选框1，文本框将出现，没有任何错误消息
2.然后提交表格将显示错误.那样就好.
2.then submit the form it will show the error. that is fine.
- 选中复选框2，再次出现新文本框，并显示错误消息，而无需单击提交按钮.
但是我希望仅当用户再次按下提交按钮时才显示第二条错误消息.
But I WANT that second error message display only if the user hit submit button again.
谢谢
不确定我是否明白您的意思，但是请尝试以下操作:
Not sure if I got your point, but try this:
在您的组件中添加一些变量SubmitCount:数字；然后，每当您单击提交"按钮时，只需增加此计数器即可；最后添加到第二个文本框的ngIf中，"submitCount> 1&&"这应该是吗?
add some variable submitCount: number to your component; then everytime you click the submit button, just increase this counter; and finally add to the ngIf of your 2nd textbox 'submitCount > 1 &&' and this should be it?