Angular dropdown with an option set to space value

My <select> element has an ng-model, and one of the options is a space. When the initial value is something other than a space, Angular selects the correct option. However, when the initial value is a space, Angular adds an empty option.

This behavior can be replicated with the following HTML:

<select ng-model="a" ng-trim="false">
  <option value=" ">Default</option>
</select>

<select ng-model="b">
  <option value="x">Default</option>
</select>

and using a controller like this:

$scope.a = " ";
$scope.b = "x";

The first select field will have a blank option, while the second will display "Default". The use of ng-trim does not resolve this issue, and since the values are fetched from a database, they cannot be easily modified.

This problem persists across versions of Angular including 1.4.8, 1.4.9 (the version in use), and 1.5.8. These versions are accessible at https://code.angularjs.org/.

A live demonstration of the issue is available in this fiddle: https://jsfiddle.net/d1cj3kzb/4/.

I am seeking a solution that will allow the <select> element to display the correct option even when ng-model is initialized to a space.

Answer №1

To improve your code, consider defining a variable with the default value you want to use. For example:

let spaceChar = " ";

Then, in your select element:

<select ng-model="a" ng-trim="false">
    <option value="{{spaceChar}}">Default</option>
</select>

Answer №2

Would you like to give this a shot?

Implement ng-trim in your selection:

<div ng-app="app" ng-controller="MyCtrl">
    <select ng-model="a" >
      <option value=" " ng-trim="true">Default</option>
    </select>

    <select ng-model="b">
      <option value="x">Default</option>
    </select>

Make sure to trim your variable before binding.

angular.module("app", [])
  .controller("MyCtrl",
    function ($scope) {
        $scope.a = (" ").trim();
        $scope.b = "x";
    }
);

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