What causes my AngularJS dropdown to have an extra blank space when adding options?

My task involves retrieving data from a webservice using AngularJS, with the data arriving in JSON format.

Below is an excerpt from my JavaScript file:

//getzonebyid
$http.get('/zone.asmx/zone', {
    params: {
        log: log,
        pm: pm,
        id: $scope.updateparam.Id
    }
})

.then(function (response) {
    {
        $scope.gzone = response.data.zone;
        console.log(response.data.zone);
    }
});

In addition, I have a dropdown list as follows:

<select ng-model="uzone" ng-change="locationupd(c)">
   <option ng-repeat="l in gzone" value="{{l.jzone}}">{{l.jzone}}</option>
</select>

I am facing an issue where there is an extra blank space at the top of my dropdown list. My goal is to have the first option display the initial value fetched from the database, but this extra space is causing a problem.

I've attempted to resolve this by assigning the value to

$scope.uzone = $scope.gzone[0].value;
, but unfortunately, it hasn't worked. I've been stuck on this for several days now.

The data retrieved is in JSON format:

{"zone":[{"jzone":"South"},{"jzone":"East"},{"jzone":"North"},{"jzone":"West"}]}

Answer №1

The reason for this issue may vary depending on how the select tag is written. Here are some examples to help you understand better:

(function(angular) {
  'use strict';
angular.module('staticSelect', [])
  .controller('ExampleController', ['$scope', function($scope) {
    $scope.data = {
     singleSelect: null,
     multipleSelect: [],
     option1: 'option-1'
    };

    $scope.forceUnknownOption = function() {
      $scope.data.singleSelect = 'nonsense';
    };
 }]);
})(window.angular);
<!doctype html>
<html lang="en">
<head>
  <meta charset="UTF-8>
  <title>Example</title>  

  <script src="//ajax.googleapis.com/ajax/libs/angularjs/1.5.8/angular.min.js></script>
</head>
<body ng-app="staticSelect">
  <div ng-controller="ExampleController">
  <form name="myForm">
    <label for="singleSelect> Single select: </label><br>
    <select name="singleSelect" ng-model="data.singleSelect">
      <option value="option-1>Option 1</option>
      <option value="option-2>Option 2</option>
    </select><br>

    <label for="singleSelect> Single select with "not selected" option and dynamic option values: </label><br>
    <select name="singleSelect" id="singleSelect" ng-model="data.singleSelect">
      <option value="">---Please select---</option> <!-- not selected / blank option -->
      <option value="{{data.option1}}">Option 1</option> <!-- interpolation -->
      <option value="option-2>Option 2</option>
    </select><br>
    <button ng-click="forceUnknownOption()">Force unknown option</button><br>
    <tt>singleSelect = {{data.singleSelect}}</tt>

    <hr>
    <label for="multipleSelect> Multiple select: </label><br>
    <select name="multipleSelect" id="multipleSelect" ng-model="data.multipleSelect" multiple>
      <option value="option-1>Option 1</option>
      <option value="option-2>Option 2</option&
      <option value="option-3>Option 3</option>
    </select><br>
    <tt>multipleSelect = {{data.multipleSelect}}</tt><br/>
  </form>
</div>
</body>
</html>

Answer №2

Your code is encountering an issue because you are utilizing ng-model without assigning a default value to it.

  <select ng-init="selected='South'" ng-model="selected " ng-options="c.jzone as c.jzone for c in result.zone"></select>

Check out the DEMO here

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