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敲除ValidationMessage绑定未显示消息

knockout-validation knockout.js javascript

0

Ian · 技术社区 · 7 年前

我想用 knockout.validation 在表单的多个部分上。大部分都很好,可以使用内置的消息附加器,但我有一个特定的字段,需要自己手动将消息添加到DOM中。

但是,我在让它工作时遇到了一个真正的问题,因为如果字段没有更改,我就无法显示文本。我已经模拟了一个非常小的示例,以尽可能接近更大的形式进行说明。

我看到的行为:

点击 submit 正确运行验证(在输入周围添加红色边框),但它不会像应该显示的那样显示错误消息。
在密码框中键入一些内容,然后清空它,然后点击提交可以正确显示错误消息和红色边框。

由于我正在尝试引入一个必填字段,我不能保证该字段曾经被修改过,所以我需要确保第一个案例有效。有人能看出我做错了什么吗?

ko.validation.init({
  registerExtenders: true,
  messagesOnModified: true,
  insertMessages: true,
  decorateInputElement: true,
  decorateElementOnModified: false,
  errorElementClass: "is-invalid",
  messageTemplate: "inline_error"
}, true);

const viewModel = {};
viewModel.submitted = ko.observable(false);
viewModel.clicked = () => { viewModel.submitted(true); };
const onlyIf = ko.computed(() => viewModel.submitted());

viewModel.user = {
  password: ko.observable().extend({
    required: {
      message: `password is required.`,
      onlyIf,
    }
  })
};

ko.applyBindings(viewModel);

.is-invalid {
  border: thick solid red;
}

.text-danger {
   color: red;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.4.2/knockout-min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout-validation/2.0.3/knockout.validation.min.js"></script>

<div id="domTest">
  <button type="button" data-bind="click: clicked">Submit</button>

  <input type="password" class="form-control" id="password" placeholder="Password" data-bind="validationOptions:{ insertMessages: false }, textInput: user.password">
  <div class="text-danger error-message" data-bind="validationMessage: user.password" />
</div>

1 回复 | 直到 7 年前

1

Jose Luis 7 年前

在本期Github中, validationMessage does not run on initial binding stevegreatrex说你需要改变 messagesOnModified 若为false:

messagesOnModified: false

从这个问题的答案来看 Knockout Validation onlyif object no function and pattern validation (steve greatrex)您需要更改 onlyIf 计算:

viewModel.onlyIf = ko.computed(() => viewModel.submitted());

然后更改属性 仅适用于 在里面 viewModel.user 指向计算的 viewModel.onlyIf :

viewModel.user = {
  password: ko.observable().extend({
    required: {
      message: `password is required.`,
      onlyIf: viewModel.onlyIf(),
    }
  })
};

希望这有帮助。

ko.validation.init({
  registerExtenders: true,
  //messagesOnModified: true,
  messagesOnModified: false,	
  insertMessages: true,
  decorateInputElement: true,
  decorateElementOnModified: false,
  errorElementClass: "is-invalid",
  messageTemplate: "inline_error"
}, true);

const viewModel = {};
viewModel.submitted = ko.observable(false);
viewModel.clicked = () => { viewModel.submitted(true); };
viewModel.onlyIf = ko.computed(() => viewModel.submitted());

viewModel.user = {
  password: ko.observable().extend({
    required: {
      message: `password is required.`,
      onlyIf: viewModel.onlyIf(),
    }
  })
};

ko.applyBindings(viewModel);

.is-invalid {
  border: thick solid red;
}

.text-danger {
   color: red;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout/3.4.2/knockout-min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/knockout-validation/2.0.3/knockout.validation.min.js"></script>

<div id="domTest">
  <button type="button" data-bind="click: clicked">Submit</button>

  <input type="password" class="form-control" id="password" placeholder="Password" data-bind="validationOptions:{ insertMessages: false }, textInput: user.password">
  <div class="text-danger error-message" data-bind="validationMessage: user.password" />
</div>