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Text input with URL validation. Sets the `url` validation error key if the content is not a valid URL.

Note: `input[url]` uses a regex to validate urls that is derived from the regex used in Chromium. If you need stricter validation, you can use `ng-pattern` or modify the built-in validators (see the Forms guide)

## Directive Info

- This directive executes at priority level 0.

## Usage

    <input type="url"
           ng-model="string"
           [name="string"]
           [required="string"]
           [ng-required="string"]
           [ng-minlength="number"]
           [ng-maxlength="number"]
           [pattern="string"]
           [ng-pattern="string"]
           [ng-change="string"]>

### Arguments

Param | Type | Details
--- | --- | ---
ngModel | string | Assignable angular expression to data-bind to.
name (optional) | string | Property name of the form under which the control is published.
required (optional) | string | Sets `required` validation error key if the value is not entered.
ngRequired (optional) | string | Adds `required` attribute and `required` validation constraint to the element when the ngRequired expression evaluates to true. Use `ngRequired` instead of `required` when you want to data-bind to the `required` attribute.
ngMinlength (optional) | number | Sets `minlength` validation error key if the value is shorter than minlength.
ngMaxlength (optional) | number | Sets `maxlength` validation error key if the value is longer than maxlength. Setting the attribute to a negative or non-numeric value, allows view values of any length.
pattern (optional) | string | Similar to `ngPattern` except that the attribute value is the actual string that contains the regular expression body that will be converted to a regular expression as in the ngPattern directive.
ngPattern (optional) | string | Sets `pattern` validation error key if the ngModel $viewValue does not match a RegExp found by evaluating the Angular expression given in the attribute value. If the expression evaluates to a RegExp object, then this is used directly. If the expression evaluates to a string, then it will be converted to a RegExp after wrapping it in `^` and `$` characters. For instance, `"abc"` will be converted to `new RegExp('^abc$')`. Note: Avoid using the `g` flag on the RegExp, as it will cause each successive search to start at the index of the last search's match, thus not taking the whole input value into account.
ngChange (optional) | string | Angular expression to be executed when input changes due to user interaction with the input element.

## Examples

    <script>
      angular.module('urlExample', [])
        .controller('ExampleController', ['$scope', function($scope) {
          $scope.url = {
            text: 'http://google.com'
          };
        }]);
    </script>
    <form name="myForm" ng-controller="ExampleController">
      <label>URL:
        <input type="url" name="input" ng-model="url.text" required>
      <label>
      <div role="alert">
        <span class="error" ng-show="myForm.input.$error.required">
          Required!</span>
        <span class="error" ng-show="myForm.input.$error.url">
          Not valid url!</span>
      </div>
      <tt>text = {{url.text}}</tt><br/>
      <tt>myForm.input.$valid = {{myForm.input.$valid}}</tt><br/>
      <tt>myForm.input.$error = {{myForm.input.$error}}</tt><br/>
      <tt>myForm.$valid = {{myForm.$valid}}</tt><br/>
      <tt>myForm.$error.required = {{!!myForm.$error.required}}</tt><br/>
      <tt>myForm.$error.url = {{!!myForm.$error.url}}</tt><br/>
     </form>

    var text = element(by.binding('url.text'));
    var valid = element(by.binding('myForm.input.$valid'));
    var input = element(by.model('url.text'));

    it('should initialize to model', function() {
      expect(text.getText()).toContain('http://google.com');
      expect(valid.getText()).toContain('true');
    });

    it('should be invalid if empty', function() {
      input.clear();
      input.sendKeys('');

      expect(text.getText()).toEqual('text =');
      expect(valid.getText()).toContain('false');
    });

    it('should be invalid if not url', function() {
      input.clear();
      input.sendKeys('box');

      expect(valid.getText()).toContain('false');
    });