angular restriction to not allow spaces in text field

问题

I do not want a user to enter spaces in a text field. I don't want it on submit validation but rather - a space will not show up on the text field when they click it.

回答1:

<input ng-model="field" ng-trim="false" ng-change="field = field.split(' ').join('')" type="text">

Update: To improve code quality you can create custom directive instead. But don't forget that your directive should prevent input not only from keyboard, but also from pasting.

<input type="text" ng-trim="false" ng-model="myValue" restrict-field="myValue">

Here is important to add ng-trim="false" attribute to disable trimming of an input.

angular
  .module('app')
  .directive('restrictField', function () {
    return {
        restrict: 'AE',
        scope: {
            restrictField: '='
        },
        link: function (scope) {
          // this will match spaces, tabs, line feeds etc
          // you can change this regex as you want
          var regex = /\s/g;

          scope.$watch('restrictField', function (newValue, oldValue) {
              if (newValue != oldValue && regex.test(newValue)) {
                scope.restrictField = newValue.replace(regex, '');
              }
          });
        }
    };
  });

回答2:

The selected answer is arguably not very unobtrusive. And if you need to use it in multiple places, you'll end up with duplicated code.

I prefer to prevent the input of spaces using the following directive.

app.directive('disallowSpaces', function() {
  return {
    restrict: 'A',

    link: function($scope, $element) {
      $element.bind('input', function() {
        $(this).val($(this).val().replace(/ /g, ''));
      });
    }
  };
});

This directive can be invoked like this:

<input type="text" disallow-spaces>

回答3:

THe directive Jason wrote did not work for me. I had to change return false to: e.preventDefault() like so:

app.directive('disallowSpaces', function() {
    return {
        restrict: 'A',

        link: function($scope, $element) {
            $element.bind('keydown', function(e) {
                if (e.which === 32) {
                    e.preventDefault();
                }
            });
        }
    }
});

回答4:

This works to prevent entering any special chars including spaces:

app.directive('noSpecialChar', function() {
return {
    require: 'ngModel',
    restrict: 'A',
    link: function(scope, element, attrs, modelCtrl) {
        modelCtrl.$parsers.push(function(inputValue) {
            if (inputValue == null)
                return ''
            let cleanInputValue = inputValue.replace(/[^\w]|_/gi, '');
            if (cleanInputValue != inputValue) {
                modelCtrl.$setViewValue(cleanInputValue);
                modelCtrl.$render();
            }
            return cleanInputValue;
        });
    }
}
});

回答5:

If you want to achieve it without writing directive

ng-keydown="$event.keyCode != 32 ? $event:$event.preventDefault()"

来源：https://stackoverflow.com/questions/27322826/angular-restriction-to-not-allow-spaces-in-text-field

标签

angularjs

angularjs-directive