我有这个指令,可以是必需的。它可以以两种方式使用(据我所知)
class scenario
{
public:
int id;
std::vector<std::vector<int> > demandes;
scenario() {}
void setid(int i) { id=i; }
void setdemande( std::vector<int> v) { demandes.push_back(v); }
int getid() const { return id; }
};
Scenario.resize(nb_scenario);
for (int i = 0; i < nb_scenario; ++i)
{
Scenario[i].setid(i);
}
int s;
for(int i=0; i<nb_periode ; i++) {
fichier >> s ;
for(int j=0;j<nb_produit;j++){
fichier >> s ;
for(int k=0;k<nb_scenario;k++){
fichier >> s;
Scenario[k].demandes[j][i]= s; //Error here
}
}
}
或
<my-foo required></my-foo>
所以,因为require
and ngRequire
are basically the same thing你会认为该指令可以做到这一点
HTML:
<my-foo ng-required="data.value > 10"></my-foo>
JS:
<my-foo ng-require="data.isRequired"></my-foo>
嗯,不,这不起作用,...
.directive('myFoo', function () {
return {
restrict: 'E',
scope: {
required: '='
}
...
是scope.require
。您实际上必须将范围定义更改为
undefined
所以问题是处理这两种情况的首选方法是什么,以便将值存储在scope: {
required: '=ngRequired'
}
中?我应该从链接功能中定义两者还是使用attrs?
答案 0 :(得分:5)
您可以选择基本上两种方法:
ng-model
如果您查看ng-required
指令源代码,您会发现它只处理ng-model
controller:
restrict: 'A',
require: '?ngModel',
link: function(scope, elm, attr, ctrl) {
if (!ctrl) return;
attr.required = true; // force truthy in case we are on non input element
ctrl.$validators.required = function(modelValue, viewValue) {
return !attr.required || !ctrl.$isEmpty(viewValue);
};
attr.$observe('required', function() {
ctrl.$validate();
});
}
因此,如果您的自定义指令支持ng-model
,您已经支持ng-required
,即:
angular.module('test', [])
.directive('myInput', function(){
return {
restrict: 'E',
require: 'ngModel',
scope: true,
template: '<div><button ng-click="changeValue()">Change Value from: {{currentValue}}</button></div>',
link: function (scope, element, attrs, ngModelCtrl) {
ngModelCtrl.$parsers.push(function(val){
if(!val){
return null;
}
return parseFloat(val, 10) * 100;
});
ngModelCtrl.$render = function() {
scope.currentValue = ngModelCtrl.$viewValue || 'No value';
};
scope.changeValue = function read(){
var newValue = Math.random();
if(newValue > 0.5){
ngModelCtrl.$setViewValue(newValue + "");
} else {
ngModelCtrl.$setViewValue(null);
}
ngModelCtrl.$render();
};
}
};
});
ng-required
:
angular.module('test', [])
.directive('myFormElement', function() {
return {
restrict: 'E',
scope: {
model: '=',
required: '='
},
template: '<div>Enter number: <input type="number" ng-model="data.number" ng-required="required"></div>'
};
});
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div ng-app="test" ng-init="data={value:'Initial', required: false}">
<form>
Is required: <input type="checkbox" ng-model="data.required">
<my-form-element required="data.required" model="data"></my-form-element>
</form>
</div>