验证消息未出现

Question

将 ko 验证扩展程序添加到动态对象时，调用 showAllMessages() 时不会显示错误消息。相应控件下方也没有添加 span 标记，这将显示错误消息。

我还喜欢在对象添加到可观察数组后立即在控件下方显示错误消息。

请找到fiddle
http://plnkr.co/edit/PUgxqrarDeaabDxUwgLO?p=preview

JavaScript

var schedule = function() {


var self = this;
  self.name = ko.observable();
  self.startDate = ko.observable();
  self.endDate = ko.observable();

  // Add validation
  self.name.extend({required: {message: 'Name Required'}});
  self.startDate.extend({required: {message: 'Start Date Required'}});
  self.endDate.extend({required: {message: 'End Date Required'}});
}

var viewmodel = {
  model: {
    lookups: {
      grandSlams: ["Australian Open", "French Open", "Wimbledon", "US Open"]
    },
    schedules: ko.observableArray(),
    status: ko.observable()
  },
  actions: {
    addSchedule: function() {
      console.log('Add Called');
      viewmodel.model.schedules.push(new schedule());
      viewmodel.model.status('Edited');
      console.log(viewmodel.model.schedules().length);
    },
    saveSchedule: function(){
      console.log('Save Called');
      var errors = ko.validation.group(viewmodel.model.schedules, { deep: true });
      if (errors().length > 0) {
          console.log(errors());
          errors.showAllMessages();
          hasError = true;
      }
      viewmodel.model.status('Saved!!!');
    }
  }
};

$(function() {
  ko.validation.init({
            insertMessages: true,
            messagesOnModified: true,
            grouping: {
                deep: true,        //by default grouping is shallow
                observable: true    //and using observables
            }
        });
  ko.applyBindings(viewmodel);
});

HTML

<!DOCTYPE html>
<html>

  <head>
    <script data-require="jquery@*" data-semver="2.1.4" src="http://code.jquery.com/jquery-2.1.4.min.js"></script>
    <script data-require="knockout@2.2.1" data-semver="2.2.1" src="//cdnjs.cloudflare.com/ajax/libs/knockout/2.2.1/knockout-min.js"></script>
    <script data-require="knockout-validation@*" data-semver="1.0.2" src="//cdnjs.cloudflare.com/ajax/libs/knockout-validation/1.0.2/knockout.validation.js"></script>
    <link rel="stylesheet" href="style.css" />
    <script src="script.js"></script>
  </head>

  <body>
    <h1>Knockout Validation!</h1>
    <button data-bind="click: actions.addSchedule">Add Schedule</button>
    <button data-bind="click: actions.saveSchedule">Save Schedule</button>
    <h3>Schedules</h3>
    <table>
      <thead>
        <tr>
          <th>Grand Slams</th>
          <th>Start</th>
          <th>End</th>
        </tr>
      </thead>
      <tbody data-bind="foreach:model.schedules">
        <tr>
          <td style="width:250px">
            <select data-bind="options: $root.model.lookups.grandSlams, optionsCaption:'Select...'"></select>
          </td>
          <td style="width:250px">
            <input type="text" data-bind="value: startDate" />
          </td>
          <td style="width:250px">
            <input type="text" data-bind="value: endDate" />
          </td>
        </tr>
      </tbody>
    </table>
    <h3 data-bind="text: model.status"></h3>
  </body>

</html>

Answer 1

Updated example

您缺少 select 元素上的值绑定。应该是

<select data-bind="value: name, options: $root.model.lookups.grandSlams, optionsCaption:'Select...'"></select>

更新视图模型，如果你想在 addSchedule 上验证（你现在可以从保存中删除 this.actions.showErrors()，我留下它以防万一）

var viewmodel = {
  model: {
    lookups: {
      grandSlams: ["Australian Open", "French Open", "Wimbledon", "US Open"]
    },
    schedules: ko.observableArray(),
    status: ko.observable()
  },
  actions: {
    addSchedule: function() {
      console.log('Add Called');
      viewmodel.model.schedules.push(new schedule());
      viewmodel.model.status('Edited');
      this.actions.showErrors();
      console.log(viewmodel.model.schedules().length);
    },
    showErrors: function() {
      var errors = ko.validation.group(viewmodel.model.schedules, { deep: true });
      if (errors().length > 0) {
          console.log(errors());
          errors.showAllMessages();
          hasError = true;
      }
    },
    saveSchedule: function(){
      console.log('Save Called');
      var errors = ko.validation.group(viewmodel.model.schedules, { deep: true });
      this.actions.showErrors();
      viewmodel.model.status('Saved!!!');
    }
  }
};

验证消息未出现

Validation message not appearing

javascript

knockout.js

knockout-validation