我已经创建了一个下拉指令，我试图在将参数传递给指令时分配方法，我将从控制器调用这些方法。但是在第一次加载时，我没有在控制器中获得分配方法，但是当我在第二次加载时分配它（即在下拉更改事件中）并且它工作正常。
首次加载后，如何在调用控制器中获取首次加载指令的方法。
这是指令：
"use strict";
myApp.directive("selectDirective", [function () {
return {
restrict: "E",
template: '<select class="form-control input-sm dropdown" data-ng-model="model.args.selectedItem" data-ng-options="item[model.args.displayField] for item in model.args.source" data-ng-change="model.itemChange(model.args.selectedItem)"><option value="">Select Any Item</option></select>',
scope: {
},
bindToController: { args: "=" },
controller: function () {
var self = this;
var initializeControl = function () {
if (self.args == undefined) {
self.args = {};
}
if (self.args.method == undefined) {
self.args.method = {};
}
if (self.args.isDisabled == undefined) {
self.args.isDisabled = false;
}
if (self.args.displayField == undefined) {
self.args.displayField = '';
//alert('Display Field is blank for dropdown control.')
}
if (self.args.valueField == undefined) {
self.args.valueField = '';
//alert('Value Field is blank for dropdown control.')
}
if (self.args.source == undefined) {
self.args.source = {};
}
if (self.args.hide == undefined) {
self.args.hide = false;
}
}
//here i'm assigning the methods in passing parameter
var assignMethod = function () {
self.args.method =
{
setEnable: function (args) {
self.args.isDisabled = !args;
},
setVisible: function (args) {
self.args.hide = !args;
},
getText: function () {
return self.args.selectedText;
},
getValue: function () {
return self.args.selectedValue;
},
setItem: function (item) {
debugger;
if (item != undefined) {
var index = self.args.source.indexOf(item);
self.args.selectecText = item[self.args.displayField];
self.args.selectecValue = item[self.args.valueField];
self.args.selectedItem = item;
self.args.selectedIndex = index;
}
}
}
}
self.itemChange = function (item) {
debugger;
if (item != undefined) {
var index = self.args.source.indexOf(item);
self.args.selectecText = item[self.args.displayField];
self.args.selectecValue = item[self.args.valueField];
self.args.selectedItem = item;
self.args.selectedIndex = index;
}
}
initializeControl();
assignMethod();
},
controllerAs: 'model'
}
}]);
这是调用控制器代码：
"use strict";
myApp.controller("homeController", [function () {
var self = this;
var initializeControl = function () {
var myList = [{ id: 1, name: 'List1', value: 'List1' },
{ id: 2, name: 'List2', value: 'List2' }];
self.argsParam = {
displayField: 'name',
valueField: "value",
source: myList,
selectecText: '',
selectecValue: ''
};
self.clickMe = function () {
debugger;
var item = { id: 2, name: 'List2', value: 'List2' };
self.argsParam.method.setItem(item);
}
};
initializeControl();
}]);
查看我使用指令的位置：
<div class="cold-md-12" ng-controller="homeController as model">
<h1>Home Page</h1>
<select-directive args="model.argsParam"></select-directive>
<input type="button" value="Click" ng-click="model.clickMe()" />
</div>
场景：如果在下拉更改事件的指令中第二次调用分配的方法，那么我可以在传递参数时获取这些方法。
IE
self.itemChange = function (item) {
debugger;
if (item != undefined) {
var index = self.args.source.indexOf(item);
self.args.selectecText = item[self.args.displayField];
self.args.selectecValue = item[self.args.valueField];
self.args.selectedItem = item;
self.args.selectedIndex = index;
// here i'm assigning these method on change event then it's working fine after changing the value otherwise no success
assignMethod();
}
}
那么，我怎样才能在第一次加载指令时获得传递参数中分配的方法？