AngularJs实现ng1.3+表单验证

前一篇文章详解说过，ng1.3+以后对于表单验证有了优化，它不再需要一个详细的表达式状态创建元素显示或隐藏。

例如：我们在ng1.3之前的版本都需要如下写法：

ng1.3之后新增了一个ngMessages指令，他被打包成一个模块发布，因此我们使用的时候只需要将这个依赖模块引入即可

怎么用？

现在我们学习一下，它的用法，Code如下：

Index@H_<a href="https://www.jb51.cc/tag/403/" target="_blank" class="keywords">403</a>_17@ <link href="~/Content/css/bootstrap.min.css" rel="stylesheet" /> <script src="~/Javascript/angular.js"></script> <script src="~/Javascript/angular-messages.js"></script> <pre><code><style type="text/css"> body { padding-top: 30px; } </style></code></pre> </head> <body> <div class="col-md-6"> <form role="form" name="myForm" class="form-horizontal" novalidate> <div class="form-group"> <div class="col-md-2"> <a href="https://www.jb51.cc/tag/yonghuming/" target="_blank" class="keywords">用户名</a> </div> <div class="col-md-10"> <input type="text" placeholder="ng-Messages测试" name="name" ng-model="username.name" ng-minlength=3 ng-maxlength=20 required /> <hr/> $error：{{myForm.name.$error}} <hr/> <div ng-messages="myForm.name.$error"> <div ng-message="<a href="https://www.jb51.cc/tag/required/" target="_blank" class="keywords">required</a>">必填项</div> <div ng-message="minlength">字符太短小于3</div> <div ng-message="maxlength">字符太长大于20</div> </div> </div> </div> </form> </div> </body> </html> <script type="text/javascript"> angular.module("myTest",['ngMessages']); </script> </pre> </div> <p><a href="https://www.jb51.cc/tag/xiaoguo/" target="_blank" class="keywords">效果</a>如下：</p> <p style="text-align: center"><p class="pic_center"><img id="theimg" onclick="window.open(this.src)" src="https://files.jb51.cc/file_images/article/201512/20151210104610209.gif?20151110104622" alt="" /></p></p> <p>可以看出，其实ng是通过$error来监视模型的变化，因为$error中包含了<a href="https://www.jb51.cc/tag/cuowu/" target="_blank" class="keywords">错误</a>的详细信息，同时，如果我们的应用场景中如果同时，有好几处<a href="https://www.jb51.cc/tag/cuowu/" target="_blank" class="keywords">错误</a>，那么，上面<a href="https://www.jb51.cc/tag/daima/" target="_blank" class="keywords">代码</a>按照ng-message的顺序只会<a href="https://www.jb51.cc/tag/xianshi/" target="_blank" class="keywords">显示</a>一条<a href="https://www.jb51.cc/tag/cuowu/" target="_blank" class="keywords">错误</a>信息，如果我们需要全部<a href="https://www.jb51.cc/tag/xianshi/" target="_blank" class="keywords">显示</a>出来只需要<a href="https://www.jb51.cc/tag/tianjia/" target="_blank" class="keywords">添加</a> ng-messages-multiple</p> <div class="jb51code"> <pre class="brush:xhtml;"> <input type="text" placeholder="测试" name="name" ng-model="username.name" ng-minlength=3 ng-maxlength=20 required /> <div ng-messages="myForm.name.$error" ng-messages-multiple> <div ng-message="<a href="https://www.jb51.cc/tag/required/" target="_blank" class="keywords">required</a>">必填项</div> <div ng-message="email"><a href="https://www.jb51.cc/tag/youjian/" target="_blank" class="keywords">邮件</a>格式不对</div> <div ng-message="minlength">字符太短小于3</div> <div ng-message="maxlength">字符太长大于20</div> </div> </pre> </div> <p><a href="https://www.jb51.cc/tag/xiaoguo/" target="_blank" class="keywords">效果</a>如下：</p> <p style="text-align: center"><p class="pic_center"><img id="theimg" onclick="window.open(this.src)" src="https://files.jb51.cc/file_images/article/201512/20151210104726420.gif?20151110104741" alt="" /></p></p> <p><span style="color: #800000"><h3>怎么复用？</h3></p> <p>我们的验证信息在一个项目中大多是通用性很高的（对于样式，描述等都有高度的统一性），因此我们这里也会考虑到复用，ng中同样提供了<a href="https://www.jb51.cc/tag/jiejuefang/" target="_blank" class="keywords">解决方</a>案</p> <p>就是将其作为模板，指定请求路径由ng<a href="https://www.jb51.cc/tag/zidongtianjia/" target="_blank" class="keywords">自动添加</a>。这里再介绍一个指令 ng-messages-include</p> <p>我们将上面的验证信息保存到一个独立的html静态<a href="https://www.jb51.cc/tag/yemian/" target="_blank" class="keywords">页面</a>中，然后使用ng-messages-include指定请求路径即可。</p> <p>Code:</p> <div class="jb51code"> <pre class="brush:xhtml;"> <div ng-messages="myForm.name.$error" ng-messages-multiple ng-messages-include ="@Url.Content("~/Content/template/error.html")"> </div> </pre> </div> <p>error.html</p> <div class="jb51code"> <pre class="brush:xhtml;"> <div ng-message="<a href="https://www.jb51.cc/tag/required/" target="_blank" class="keywords">required</a>">必填项</div> <div ng-message="email"><a href="https://www.jb51.cc/tag/youjian/" target="_blank" class="keywords">邮件</a>格式不对</div> <div ng-message="minlength">字符太短小于3</div> <div ng-message="maxlength">字符太长大于20</div> </pre> </div> <p><a href="https://www.jb51.cc/tag/xiaoguo/" target="_blank" class="keywords">效果</a>如下：</p> <p style="text-align: center"><p class="pic_center"><img id="theimg" onclick="window.open(this.src)" src="https://files.jb51.cc/file_images/article/201512/20151210104806127.png?20151110104817" alt="" /></p></p> <p>当然，模板可能在特殊的时期某些字段<a href="https://www.jb51.cc/tag/cuowu/" target="_blank" class="keywords">错误</a><a href="https://www.jb51.cc/tag/tishi/" target="_blank" class="keywords">提示</a>不能满足你的要求，你可以<a href="https://www.jb51.cc/tag/tianjia/" target="_blank" class="keywords">添加</a><a href="https://www.jb51.cc/tag/zidingyi/" target="_blank" class="keywords">自定义</a>的<a href="https://www.jb51.cc/tag/tishi/" target="_blank" class="keywords">提示</a>如下：</p> <div class="jb51code"> <pre class="brush:xhtml;"> <div class="error" ng-messages="signup_form.name.$error" ng-messages-include="templates/errors.html">  </div> </pre> </div> <p><a href="https://www.jb51.cc/tag/zidingyi/" target="_blank" class="keywords">自定义</a>验证(指令)涉及到的细节知识点很多，如果简单地为了用而用，可能写得出<a href="https://www.jb51.cc/tag/gongneng/" target="_blank" class="keywords">功能</a>，但是<a href="https://www.jb51.cc/tag/daima/" target="_blank" class="keywords">代码</a>丑陋，太菜了，还需要花个把月方能弄懂点皮毛，这部分暂告一段落，等彻底明白了，在大家<a href="https://www.jb51.cc/tag/fenxiang/" target="_blank" class="keywords">分享</a>，大家亦可以结合<a target="_blank" href="//www.jb51.cc/article/76160.htm">《理解AngularJs指令》</a>进行学习。</p><i class="glyphicon glyphicon-link"></i> 原文链接：https://www.f2er.com/js/51179.html</div> <div class="topcard-tags"><a href="https://www.f2er.com/tag/ng13/" class="tag_link" target="_blank">ng1.3+</a><a href="https://www.f2er.com/tag/biaodanyanzheng/" class="tag_link" 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