参考博客: https://www.cnblogs.com/rohelm/p/4033513.html
常用的表单验证指令
1. 必填项验证
某个表单输入是否已填写，只要在输入字段元素上添加HTML5标记required即可：
<input type="text" required />
2. 最小长度
验证表单输入的文本长度是否大于某个最小值，在输入字段上使用指令ng-minleng= "{number}"：
<input type="text" ng-minlength="5" />
3. 最大长度
验证表单输入的文本长度是否小于或等于某个最大值，在输入字段上使用指令ng-maxlength="{number}"：
<input type="text" ng-maxlength="20" />
4. 模式匹配
使用ng-pattern="/PATTERN/"来确保输入能够匹配指定的正则表达式：
<input type="text" ng-pattern="/[a-zA-Z]/" />
5. 电子邮件
验证输入内容是否是电子邮件，只要像下面这样将input的类型设置为email即可：
<input type="email" name="email" ng-model="user.email" />
6. 数字
验证输入内容是否是数字，将input的类型设置为number：
<input type="number" name="age" ng-model="user.age" />
7. URL
验证输入内容是否是URL，将input的类型设置为 url：
<input type="url" name="homepage" ng-model="user.facebook_url" />
下面我们将这些表单验证放到具体的实现中来测试一下：
?<div class="col-md-6"> ???????<form role="form" class="form-horizontal"> ???????????<div class="form-group"> ???????????????<div class="col-md-4"> ???????????????????<label for="name">1.必填项</label> ???????????????</div> ???????????????<div class="col-md-8"> ???????????????????<input class="form-control" id="name" type="text" required ng-model=‘user.name‘ /> ???????????????</div> ???????????</div> ???????????<div class="form-group"> ???????????????<div class="col-md-4"> ???????????????????<label for="minlength">2.最小长度=5</label> ???????????????</div> ???????????????<div class="col-md-8"> ???????????????????<input type="text" id="minlength" ng-minlength="5" ng-model="user.minlength" class="form-control" /> ???????????????</div> ???????????</div> ???????????<div class="form-group"> ???????????????<div class="col-md-4"> ???????????????????<label for="minlength">3.最大长度=20</label> </div> ???????????????<div class="col-md-8"> ???????????????????<input type="text" ng-model="user.maxlength" ng-maxlength="20" class="form-control" /> ???????????????</div> ???????????</div> ???????????<div class="form-group"> ???????????????<div class="col-md-4"> ???????????????????<label for="minlength">4. 模式匹配</label> ??????????????</div> ???????????????<div class="col-md-8"> ????????????????<input type="text" id="minlength" ng-model="user.pattern" ng-pattern="/^[a-zA-Z]*\d$/" class="form-control" /> ???????????????</div> ???????????</div> ???????????<div class="form-group"> ???????????????<div class="col-md-4"> ???????????????????<label for="email">5. 电子邮件</label> </div> ???????????????<div class="col-md-8"> ???????????????????<input type="email" id="email" name="email" ng-model="user.email" class="form-control" /> ???????????????</div> ???????????</div> ???????????<div class="form-group"> ???????????????<div class="col-md-4"> ???????????????????<label for="age">6. 数字</label> </div> ???????????????<div class="col-md-8"> ???????????????????<input type="number" id="age" name="age" ng-model="user.age" class="form-control" /> ???????????????</div> ???????????</div> ???????????<div class="form-group"> ???????????????<div class="col-md-4"> ???????????????????<label for="url"> 7. URL</label> </div> ???????????????<div class="col-md-8"> ???????????????????<input type="url" id="url" name="homepage" ng-model="user.url" class="form-control" /> ???????????????</div> ???????????</div> ???????????<div class="form-group text-center"> ???????????????<input class="btn btn-primary btn-lg" type="submit" value="提交" /> ???????????</div> ???????</form> ??????????</div> ???<div class="col-md-12"> ???????1.必填项:{{user.name}}<br> ???????2.最小长度=5:{{user.minlength}}<br> ???????3.最大长度=20:{{user.maxlength}}<br> ???????4.模式匹配:{{user.pattern}}<br> ???????5.电子邮件:{{user.email}}<br> ???????6.数字:{{user.age}}<br> ???????7.URL:{{user.url}}<br> ???</div>在测试中我们发现，只有当表达式满足验证，才会实时进行双向绑定。同时我们也发现，效果图如下：
似乎并没有发生什么问题，但是如果我们将其移植到一个队HTML5验证不怎么好的浏览器再来测试一下【本例IE9】，问题来了，某些字段完全没得验证
表单验证<AngularJs>
原文地址：https://www.cnblogs.com/xumBlog/p/9940863.html