Exploring the world of Bootstrap Twitter 3.0 alongside the wonders of Knockout

Question

Exploring the world of Bootstrap Twitter 3.0 alongside the wonders of Knockout

When utilizing Twitter Bootstrap, the validation classes like has-error or has-warning must be added to the wrapping form-group element to style both the input and its label. However, Knockout-Validation directly adds the class to the input element itself.

<div class="form-group has-error">
    <label class="control-label">Input with error</label>
    <input type="text" class="form-control">
</div>

Is there a way to configure Knockout-Validation so that it applies the classes to the div instead of the input?

javascript css twitter-bootstrap knockout.js

Answer 1

Answer №1

While thebringking's answer provides some guidance, it doesn't cover all necessary steps. You'll also have to define the errorMessageClass and decorateInputElement parameters.

ko.validation.init({
  errorElementClass: 'has-error',
  errorMessageClass: 'help-block',
  decorateInputElement: true
});

var viewModel = ko.validatedObservable({
  name: ko.observable().extend({
    required: true
  }),
  email: ko.observable().extend({
    required: true,
    email: true
  }),
  submit: function() {

    if (!this.isValid()) {
      this.errors.showAllMessages();
    } else {
      alert('good job');
    }
  }
});

ko.applyBindings(viewModel);

<link href="http://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.0.2/css/bootstrap.min.css" rel="stylesheet" />


<div class="container">
  <form class="form-horizontal">
    <div class="form-group" data-bind="validationElement: name">
      <label class="control-label col-xs-2" for="name">Name</label>
      <div class="col-xs-10">
        <input id="name" class="form-control" type="text" data-bind="textInput: name" />
      </div>
    </div>
    <div class="form-group" data-bind="validationElement: email">
      <label class="control-label col-xs-2" for="email">Email</label>
      <div class="col-xs-10">
        <input id="email" class="form-control" type="text" data-bind="textInput: email" />
      </div>
    </div>
    <div class="form-group">
      <div class="col-xs-offset-2 col-xs-10">
        <button type="submit" class="btn btn-primary" data-bind="click: submit">Submit</button>
      </div>
    </div>
  </form>
</div>


<script src="http://cdnjs.cloudflare.com/ajax/libs/knockout/3.3.0/knockout-min.js"></script>
<script src="http://cdnjs.cloudflare.com/ajax/libs/knockout-validation/2.0.3/knockout.validation.min.js"></script>

Answer 2

While thebringking's answer provides some guidance, it doesn't cover all necessary steps. You'll also have to define the errorMessageClass and decorateInputElement parameters.

ko.validation.init({
  errorElementClass: 'has-error',
  errorMessageClass: 'help-block',
  decorateInputElement: true
});

var viewModel = ko.validatedObservable({
  name: ko.observable().extend({
    required: true
  }),
  email: ko.observable().extend({
    required: true,
    email: true
  }),
  submit: function() {

    if (!this.isValid()) {
      this.errors.showAllMessages();
    } else {
      alert('good job');
    }
  }
});

ko.applyBindings(viewModel);

<link href="http://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.0.2/css/bootstrap.min.css" rel="stylesheet" />


<div class="container">
  <form class="form-horizontal">
    <div class="form-group" data-bind="validationElement: name">
      <label class="control-label col-xs-2" for="name">Name</label>
      <div class="col-xs-10">
        <input id="name" class="form-control" type="text" data-bind="textInput: name" />
      </div>
    </div>
    <div class="form-group" data-bind="validationElement: email">
      <label class="control-label col-xs-2" for="email">Email</label>
      <div class="col-xs-10">
        <input id="email" class="form-control" type="text" data-bind="textInput: email" />
      </div>
    </div>
    <div class="form-group">
      <div class="col-xs-offset-2 col-xs-10">
        <button type="submit" class="btn btn-primary" data-bind="click: submit">Submit</button>
      </div>
    </div>
  </form>
</div>


<script src="http://cdnjs.cloudflare.com/ajax/libs/knockout/3.3.0/knockout-min.js"></script>
<script src="http://cdnjs.cloudflare.com/ajax/libs/knockout-validation/2.0.3/knockout.validation.min.js"></script>

Answer 3

Answer №2

One way to customize knockout validation core is by following this approach:

var initialize = ko.bindingHandlers['validationCore'].initialize;
ko.bindingHandlers['validationCore'].initialize = function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
    initialize(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext);
    var configuration = ko.validation.utils.getConfigOptions(element);
    // Check if decoration of element is requested
    if (configuration.decorateInputElement && ko.validation.utils.isValidatable(valueAccessor())) {
        var parentElement = $(element).parents(".form-group");
        if (parentElement.length) {
            ko.applyBindingsToNode(parentElement[0], { validationElement: valueAccessor() });
        }
    }
};

This modification ensures that the parent form-group will also have the same styling as the input.

Answer 4

One way to customize knockout validation core is by following this approach:

var initialize = ko.bindingHandlers['validationCore'].initialize;
ko.bindingHandlers['validationCore'].initialize = function (element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
    initialize(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext);
    var configuration = ko.validation.utils.getConfigOptions(element);
    // Check if decoration of element is requested
    if (configuration.decorateInputElement && ko.validation.utils.isValidatable(valueAccessor())) {
        var parentElement = $(element).parents(".form-group");
        if (parentElement.length) {
            ko.applyBindingsToNode(parentElement[0], { validationElement: valueAccessor() });
        }
    }
};

This modification ensures that the parent form-group will also have the same styling as the input.

Answer 5

Answer №3

One approach is to utilize the "validationElement" binding handler within the context of a bootstrap form division-

<div class="form-group" data-bind="validationElement: someObservable">
  <label class="control-label" for="inputSuccess">Input with success</label>
  <input type="text" class="form-control" id="inputSuccess">
</div>

It is important to configure the knockout validation plugin to use the bootstrap error class "has-error". This can be done by setting the configuration.

ko.validation.init({errorElementClass:'has-error'})

This method is commonly used in our tool.

Answer 6

One approach is to utilize the "validationElement" binding handler within the context of a bootstrap form division-

<div class="form-group" data-bind="validationElement: someObservable">
  <label class="control-label" for="inputSuccess">Input with success</label>
  <input type="text" class="form-control" id="inputSuccess">
</div>

It is important to configure the knockout validation plugin to use the bootstrap error class "has-error". This can be done by setting the configuration.

ko.validation.init({errorElementClass:'has-error'})

This method is commonly used in our tool.

Exploring the world of Bootstrap Twitter 3.0 alongside the wonders of Knockout

Answer №1

Answer №2

Answer №3

Similar questions

JavaScript JSON function failing to show

Uploading Files with Vuetify 2 v-file-input and AxiosIn this tutorial, we

How can I eliminate unnecessary gaps in a CSS slider design?

Why doesn't setting the SVG viewBox to "0 0 100 100" scale my path to 100%?

By utilizing jQuery, I am orchestrating the movement of a series of div elements within a container with the simple click of a button

I would like my division to split into two halves, each with a width of 50%, and be aligned next to each other using fxLayout

Using specific sections of JSON data to display in an alert message (Vanilla JavaScript)

Transform JavaScript code to integrate with a pre-existing WebSocket within a React.js application

Refreshing the webpage with new data using jQuery after an AJAX request is

how to implement a delay in closing a window using JavaScript

Aligning text vertically within an HTML <a> tag block

The Evolution of Bulma's Navigation Menu

Is there a workaround to prevent me from using overflow: scroll when I addEventListener("touchmove", preventBehavior, false)?

Web Dialogue Dimensions: Adjusting the MDC-Web Dialog Width

What could be the reason for this code not waiting for module imports?

How can I show the post JSON response that was retrieved in ReactJS on the same form component that was used to submit the value?

The MUI Slide Transition experiences a malfunction when using multiple Slide components simultaneously

Utilize Vuetify to showcase a vertical layout consisting of a header and a v-card, occupying the full height

Effortless AJAX Submission and MySQL Data Refresh

What is the best way to eliminate the curved border and inset box shadow from the Material UI TextField component in React?