Updating the text of the initial option in ngOptions within AngularJS

My select menu is set up to repeat the options using ng-options, and there is a default <option> included in the menu:

<select ng-model="selected" ng-options="d.id as d.value for d in data">
  <option value="">Choose an option</option>
</select>

Issue: I am trying to change the text inside the default option based on another property in the $scope. However, my attempts to do so have not been successful. Here is what I tried:

<select ng-model="selected" ng-options="d.id as d.value for d in data">
  <option value="" ng-if="!optional">Choose an option</option>
  <option value="" ng-if="optional">Choose an option (optional)</option>
</select>

It seems that only one default <option> element is displayed. I also attempted to use ng-show but encountered the same issue:

<select ng-model="selected" ng-options="d.id as d.value for d in data">
  <option value="">Choose an option <span ng-show="optional">(optional)</span></option>
</select>

Although it is possible to use <option ng-repeat> within the select menu, the data for the options is fetched from an AJAX call which leads to incorrect updating when the data first arrives. Therefore, I am sticking with <select ng-options>.

Feel free to check out this JSFiddle illustrating the problem.

Any suggestions on how to resolve this issue would be greatly appreciated!

Answer №1

When attempting your first method, it didn't succeed due to the guidelines from AngularJS documentation on the select directive, which specify that only a single hard-coded <option> element can be nested within the <select> element.

Regarding your second approach, it was unsuccessful because an <option> element can solely accommodate plain text content (possibly with escaped characters such as &eacute;), rather than any tag like the <span> you attempted to use.

To resolve this issue, simply implement interpolation:

<select ng-model="selected" ng-options="d.id as d.value for d in data">
    <option value="">Choose an option {{optional ? '(optional)' : ''}}</option>
</select>

Answer №2

Did you attempt to set the text using template markup?

<select ng-model="selected" ng-options="d.id as d.value for d in data">
  <option value="">{{defaultOptionText}}</option>
</select>

View it in action at this jsfiddle: http://jsfiddle.net/udu9byka/2/

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