我正在尝试创建一个使用jQueryUI自动完成小部件的自定义指令。我希望这是尽可能的声明。这是所需的标记：
<div>
<autocomplete ng-model="employeeId" url="/api/EmployeeFinder" label="{{firstName}} {{surname}}" value="id" />
</div>
因此，在上面的示例中，我希望指令对指定的url执行AJAX调用，并在返回数据时，显示从文本框中的结果中的表达式计算的值并设置id属性为employeeId。这是我对该指令的尝试。
app.directive('autocomplete', function ($http) {
return {
restrict: 'E',
replace: true,
template: '<input type="text" />',
require: 'ngModel',
link: function (scope, elem, attrs, ctrl) {
elem.autocomplete({
source: function (request, response) {
$http({
url: attrs.url,
method: 'GET',
params: { term: request.term }
})
.then(function (data) {
response($.map(data, function (item) {
var result = {};
result.label = item[attrs.label];
result.value = item[attrs.value];
return result;
}))
});
},
select: function (event, ui) {
ctrl.$setViewValue(elem.val(ui.item.label));
return false;
}
});
}
}
});
所以，我有两个问题 - 如何评估label属性中的表达式以及如何将value属性中的属性设置为我的作用域上的ngModel。
答案 0 :(得分：4)
这是我的更新指令
(function () {
'use strict';
angular
.module('app')
.directive('myAutocomplete', myAutocomplete);
myAutocomplete.$inject = ['$http', '$interpolate', '$parse'];
function myAutocomplete($http, $interpolate, $parse) {
// Usage:
// For a simple array of items
// <input type="text" class="form-control" my-autocomplete url="/some/url" ng-model="criteria.employeeNumber" />
// For a simple array of items, with option to allow custom entries
// <input type="text" class="form-control" my-autocomplete url="/some/url" allow-custom-entry="true" ng-model="criteria.employeeNumber" />
// For an array of objects, the label attribute accepts an expression. NgModel is set to the selected object.
// <input type="text" class="form-control" my-autocomplete url="/some/url" label="{{lastName}}, {{firstName}} ({{username}})" ng-model="criteria.employeeNumber" />
// Setting the value attribute will set the value of NgModel to be the property of the selected object.
// <input type="text" class="form-control" my-autocomplete url="/some/url" label="{{lastName}}, {{firstName}} ({{username}})" value="id" ng-model="criteria.employeeNumber" />
var directive = {
restrict: 'A',
require: 'ngModel',
compile: compile
};
return directive;
function compile(elem, attrs) {
var modelAccessor = $parse(attrs.ngModel),
labelExpression = attrs.label;
return function (scope, element, attrs) {
var
mappedItems = null,
allowCustomEntry = attrs.allowCustomEntry || false;
element.autocomplete({
source: function (request, response) {
$http({
url: attrs.url,
method: 'GET',
params: { term: request.term }
})
.success(function (data) {
mappedItems = $.map(data, function (item) {
var result = {};
if (typeof item === 'string') {
result.label = item;
result.value = item;
return result;
}
result.label = $interpolate(labelExpression)(item);
if (attrs.value) {
result.value = item[attrs.value];
}
else {
result.value = item;
}
return result;
});
return response(mappedItems);
});
},
select: function (event, ui) {
scope.$apply(function (scope) {
modelAccessor.assign(scope, ui.item.value);
});
if (attrs.onSelect) {
scope.$apply(attrs.onSelect);
}
element.val(ui.item.label);
event.preventDefault();
},
change: function () {
var
currentValue = element.val(),
matchingItem = null;
if (allowCustomEntry) {
return;
}
if (mappedItems) {
for (var i = 0; i < mappedItems.length; i++) {
if (mappedItems[i].label === currentValue) {
matchingItem = mappedItems[i].label;
break;
}
}
}
if (!matchingItem) {
scope.$apply(function (scope) {
modelAccessor.assign(scope, null);
});
}
}
});
};
}
}
})();
答案 1 :(得分：2)
很抱歉将其唤醒......这是一个很好的解决方案，但它不支持ng-repeat ......
我正在调试它，但我对Angular还没有足够的经验：）
修改 发现了问题。 elem.autocomplete指向elem参数被发送到编译函数。 IT需要指向返回链接函数中的元素参数。这是由于克隆了ng-repeat完成的元素。这是更正后的代码：
app.directive('autocomplete', function ($http, $interpolate, $parse) {
return {
restrict: 'E',
replace: true,
template: '<input type="text" />',
require: 'ngModel',
compile: function (elem, attrs) {
var modelAccessor = $parse(attrs.ngModel),
labelExpression = attrs.label;
return function (scope, element, attrs, controller) {
var
mappedItems = null,
allowCustomEntry = attrs.allowCustomEntry || false;
element.autocomplete({
source: function (request, response) {
$http({
url: attrs.url,
method: 'GET',
params: { term: request.term }
})
.success(function (data) {
mappedItems = $.map(data, function (item) {
var result = {};
if (typeof item === "string") {
result.label = item;
result.value = item;
return result;
}
result.label = $interpolate(labelExpression)(item);
if (attrs.value) {
result.value = item[attrs.value];
}
else {
result.value = item;
}
return result;
});
return response(mappedItems);
});
},
select: function (event, ui) {
scope.$apply(function (scope) {
modelAccessor.assign(scope, ui.item.value);
});
elem.val(ui.item.label);
event.preventDefault();
},
change: function (event, ui) {
var
currentValue = elem.val(),
matchingItem = null;
if (allowCustomEntry) {
return;
}
for (var i = 0; i < mappedItems.length; i++) {
if (mappedItems[i].label === currentValue) {
matchingItem = mappedItems[i].label;
break;
}
}
if (!matchingItem) {
scope.$apply(function (scope) {
modelAccessor.assign(scope, null);
});
}
}
});
}
}
}
});