javascript - Angularjs 表单验证仅在表单字段发生更改时才有效

Question

我正在尝试使用 angularjs 实现表单验证。当用户开始在表单字段中进行更改时，验证工作正常。但它不会显示任何错误消息如果单击提交而不输入任何内容。这是代码

<form name="myform" ng-submit="register(user)" >
        <div class="list ">
            <label class="item item-input item-stacked-label">
                <span class="input-label">Name</span>
                <input type="text" placeholder="John Watson" ng-model="user.name" name="user_name" required>
                <span style="color:red;" ng-show="myform.user_name.$dirty&&myform.user_name.$error.required">Name required</span>
            </label>
            <label class="item item-input item-stacked-label">
                <span class="input-label">Mobile Number</span>
                <input type="tel" ng-minlength="10"  maxlength="10" ng-model="user.mobileno"  placeholder="77777777" name="user_mobileno"  required>
                <span style="color:red;" ng-show="myform.user_mobileno.$dirty&&myform.user_mobileno.$error.minlength">Please provide a valid mobileNo</span>
            </label>
            <label class="item item-input item-stacked-label">
                <span class="input-label">Service Provider</span><br><br>
                <select class="clearfix" style="width:100%; height:30px;" ng-model="user.svp_name" name="user_svp_name" required>
                    <option value="">Select one </option>
                    <option value="xxxx">xxxx</option>
                    <option value="xxxx">xxx</option>

                </select><br><br>
                <span style="color:red;" ng-show="myform.user_svp_name.$dirty&&myform.user_svp_name.$error.required">Select your service provider</span>
            </label>
            <label class="item item-input item-stacked-label">
                <span class="input-label">Email Id</span>
                <input type="email" ng-model="user.email" placeholder="john@example.com" name="user_email" required>
                <span style="color:red;" ng-show="myform.user_email.$dirty&&myform.user_email.$error.email">Please Provide a valid emailId</span>
            </label>

        </div>
        <div style="padding:0 10px;">
            <input type="submit"   class="button button-balanced button-block buttonradius" value="Register" />
        </div><br /><br />
        </form>

我已经提到了这些问题 ( AngularJS validation on submit only ), ( Form validation popup window message works only if change is made in Angularjs ) , 但没有帮助我

更新 最后我找到了一个解决方案，但它没有像我预期的那样工作。这些是更改

<span style="color:red;" ng-show="submitted&&myform.user_name.$error.required">Name required</span>
<input type="submit" ng-click="submitted=true" class="button button-balanced button-block buttonradius" value="Register" />

但仅适用于name 和serviceprovider 字段(如果在未输入任何内容的情况下单击提交则显示错误消息)，不适用于其他两个字段(mobileno、email)。

Answer 1

<span style="color:red;" ng-show="myform.user_name.$dirty&&myform.user_name.$error.required">Name required</span>

myform.user_name.$dirty 就是为什么它只显示在提交表单之前是否编辑了该字段。 $dirty 在表单字段更改之前不会被设置。

我通常做的是在我的范围上放置一个 failed bool 值，如果表单无效，则在提交后我设置 $scope.failed = true;。所以如果你走那条路，你会改变你的 ng-shows 到:

<span style="color:red;" ng-show="failed && myform.user_name.$error.required">Name required</span>

Controller :

$scope.register = function(user) {
  if ($scope.myForm.$invalid) {
    // Form is invalid
    $scope.failed = true;
    return;
  }
  delete $scope.failed;


  // Other submission logic
};