【发布时间】：2015-01-13 00:06:32
【问题描述】：
我在我的 Angular 项目中使用 bootstrap typeahead。我的要求是当用户没有输入任何文本时，通过按下键打开预先输入下拉菜单。我已使用this link 成功添加了此功能。这是我的demo。
现在向下键打开下拉菜单，因此它失去了遍历下拉菜单的默认行为（向下移动到下一个选项）。
index.html
<!DOCTYPE html>
<html ng-app="plunker">
<head>
<link href="//netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css" rel="stylesheet" />
<link href="style.css" rel="stylesheet" />
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="//ajax.googleapis.com/ajax/libs/angularjs/1.2.2/angular.js"></script>
<script src="ui-bootstrap-tpls-0.10.0.js"></script>
<script src="script.js"></script>
</head>
<body>
<div class="container-fluid" ng-controller="TypeaheadCtrl">
<input type="text" ng-keydown="show($event)" ng-trim="false" ng-model="selected" empty-typeahead typeahead="state for state in states | filter:$viewValue:stateComparator" class="form-control" />
<pre ng-show="opened">Model: {{selected | json}}</pre>
</div>
</body>
</html>
script.js
(function () {
var secretEmptyKey = '[$empty$]'
angular.module('plunker', ['ui.bootstrap'])
.directive('emptyTypeahead', function () {
return {
require: 'ngModel',
link: function (scope, element, attrs, modelCtrl) {
// this parser run before typeahead's parser
modelCtrl.$parsers.unshift(function (inputValue) {
var value = (inputValue ? inputValue : secretEmptyKey); // replace empty string with secretEmptyKey to bypass typeahead-min-length check
modelCtrl.$viewValue = value; // this $viewValue must match the inputValue pass to typehead directive
return value;
});
// this parser run after typeahead's parser
modelCtrl.$parsers.push(function (inputValue) {
return inputValue === secretEmptyKey ? '' : inputValue; // set the secretEmptyKey back to empty string
});
}
}
})
.controller('TypeaheadCtrl', function($scope, $http, $timeout) {
$scope.selected = undefined;
$scope.states = ['Alabama', 'Alaska', 'Arizona', 'Arkansas', 'California', 'Colorado', 'Connecticut', 'Delaware', 'Florida', 'Georgia', 'Hawaii', 'Idaho', 'Illinois', 'Indiana', 'Iowa', 'Kansas', 'Kentucky', 'Louisiana', 'Maine', 'Maryland', 'Massachusetts', 'Michigan', 'Minnesota', 'Mississippi', 'Missouri', 'Montana', 'Nebraska', 'Nevada', 'New Hampshire', 'New Jersey', 'New Mexico', 'New York', 'North Dakota', 'North Carolina', 'Ohio', 'Oklahoma', 'Oregon', 'Pennsylvania', 'Rhode Island', 'South Carolina', 'South Dakota', 'Tennessee', 'Texas', 'Utah', 'Vermont', 'Virginia', 'Washington', 'West Virginia', 'Wisconsin', 'Wyoming'];
$scope.stateComparator = function (state, viewValue) {
return viewValue === secretEmptyKey || (''+state).toLowerCase().indexOf((''+viewValue).toLowerCase()) > -1;
};
$scope.show = function (e) {
var keyCode = e.keyCode || e.which;
if (keyCode == 40) { //If it's the down key
$timeout(function () {
$(e.target).triggerHandler('input');
});
}
};
});
}());
有没有什么办法可以在第一次点击时打开下拉菜单，如果再次点击则移动到下一个选项？
【问题讨论】：
-
我建议改用github.com/twitter/typeahead.js，它有一个可以从javascript调用的开放函数
标签： javascript jquery css angularjs angular-ui-bootstrap