Angularjs 如何知道select的ngModel何时引用ngOptions中的未知选项
我有两个基于公共数据集“选项”的级联下拉列表。第一个选定值过滤第二个选择中可用的选项Angularjs 如何知道select的ngModel何时引用ngOptions中的未知选项,angularjs,Angularjs,我有两个基于公共数据集“选项”的级联下拉列表。第一个选定值过滤第二个选择中可用的选项 <label for="select1" class="control-label">Select1</label> <select name="select1" ng-model="select1" ng-options="option.select1 as option.select1 for option in options | unique: 'select1' | or
<label for="select1" class="control-label">Select1</label>
<select name="select1" ng-model="select1" ng-options="option.select1 as option.select1 for option in options | unique: 'select1' | orderBy: 'select1'">
</select>
<label for="select2" class="control-label">Select2</label>
<select name="select2" ng-model="select2" ng-options="option.select2 as option.select2 for option in options | filter: {select1: select1} | unique: 'select2' | orderBy: 'select2'">
</select>
谢谢你的时间
编辑:
我可能过度简化了我的问题:通常有5个级联选择相互绑定。选择(n+2)取决于选择(n+1)和选择(n)。Select(n)不知道选择取决于他,例如Select(n+1,n+2,…)。表单是基于超级用户创建的表单视图模型(类似于)动态生成的
因此,在我的用例中,如果能从select2的角度判断该值是否无效,可能会更容易一些。在第一个下拉列表中使用ng change:
<label for="select1" class="control-label">Select1</label>
<select name="select1" ng-model="select1" ng-options="option.select1 as option.select1 for option in options | unique: 'select1' | orderBy: 'select1'" ng-change="select1Changed()">
</select>
<label for="select2" class="control-label">Select2</label>
<select name="select2" ng-model="select2" ng-options="option.select2 as option.select2 for option in options | filter: {select1: select1} | unique: 'select2' | orderBy: 'select2'">
</select>
希望这有帮助。我终于创建了一个验证指令,监视DOM、模型和选项集合的更改。当集合被修改时,我检查在视图中是否已经选择了“?”,并考虑如果它确实是未知的值。 它对于我的用例来说已经足够通用了,但是仍然缺少处理诸如“跟踪者”或适合所有用例的多个选择之类的事情。不管怎么说,我想这可能会对某人有所帮助:
.directive('known', ['$parse', function($parse) {
var NG_OPTIONS_REGEXP = /^\s*([\s\S]+?)(?:\s+as\s+([\s\S]+?))?(?:\s+group\s+by\s+([\s\S]+?))?\s+for\s+(?:([\$\w][\$\w]*)|(?:\(\s*([\$\w][\$\w]*)\s*,\s*([\$\w][\$\w]*)\s*\)))\s+in\s+([\s\S]+?)(?:\s+track\s+by\s+([\s\S]+?))?$/;
return {
restrict: 'AC',
require: ['select', '?ngModel'],
link: function ($scope, $element, $attrs, ctrls) {
var optionsExp = $attrs.ngOptions,
modelCtrl = ctrls[1];
if (match = optionsExp.match(NG_OPTIONS_REGEXP)) {
var valueName = match[4] || match[6],
keyName = match[5],
valueFn = $parse(match[2] ? match[1] : valueName),
valuesFn = $parse(match[7]);
$scope.$watchCollection(valuesFn, function() {
modelCtrl.$setValidity('unknown', !($element.val() == "?" && modelCtrl.$viewValue));
});
modelCtrl.$parsers.unshift(function(value) {
// value set from view can only be a known one
modelCtrl.$setValidity('unknown', true);
return value;
});
modelCtrl.$formatters.unshift(function(value) {
var values = valuesFn($scope) || [];
var valid = false;
for (var i = 0; i < values.length; i++) {
var local = {};
local[valueName] = values[i];
if (value === valueFn(local)) {
valid = true;
break;
}
}
modelCtrl.$setValidity('unknown', valid);
return value;
});
}
}
};
}]);
指令('known',['$parse',函数($parse){
(s)s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+s+]+?)?$/;
返回{
限制:“AC”,
require:['select','ngModel'],
链接:函数($scope、$element、$attrs、ctrls){
var optionexp=$attrs.ngOptions,
modelCtrl=ctrls[1];
if(match=optionexp.match(NG_OPTIONS_REGEXP)){
var valueName=match[4]| | match[6],
keyName=匹配[5],
valueFn=$parse(匹配[2]?匹配[1]:valueName),
valuesFn=$parse(匹配[7]);
$scope.$watchCollection(valuesFn,function(){
modelCtrl.$setValidity('unknown',!($element.val()==“?”&&modelCtrl.$viewValue));
});
modelCtrl.$parsers.unshift(函数(值){
//视图中的值集只能是已知值
modelCtrl.$setValidity('unknown',true);
返回值;
});
modelCtrl.$formatters.unshift(函数(值){
风险值=价值fn($scope)| |[];
var-valid=false;
对于(变量i=0;i你的权利,它应该可以完成这项工作。我尝试了一下,但如果我能从select2的角度来判断值是否不好,比如“当我的选项改变时,我会检查我的值是否好”,这对我来说会更好。我编辑我的问题,试图解释原因。
$scope.select1Changed = function () {
// logic of known/unknown based on $scope.select1
}
.directive('known', ['$parse', function($parse) {
var NG_OPTIONS_REGEXP = /^\s*([\s\S]+?)(?:\s+as\s+([\s\S]+?))?(?:\s+group\s+by\s+([\s\S]+?))?\s+for\s+(?:([\$\w][\$\w]*)|(?:\(\s*([\$\w][\$\w]*)\s*,\s*([\$\w][\$\w]*)\s*\)))\s+in\s+([\s\S]+?)(?:\s+track\s+by\s+([\s\S]+?))?$/;
return {
restrict: 'AC',
require: ['select', '?ngModel'],
link: function ($scope, $element, $attrs, ctrls) {
var optionsExp = $attrs.ngOptions,
modelCtrl = ctrls[1];
if (match = optionsExp.match(NG_OPTIONS_REGEXP)) {
var valueName = match[4] || match[6],
keyName = match[5],
valueFn = $parse(match[2] ? match[1] : valueName),
valuesFn = $parse(match[7]);
$scope.$watchCollection(valuesFn, function() {
modelCtrl.$setValidity('unknown', !($element.val() == "?" && modelCtrl.$viewValue));
});
modelCtrl.$parsers.unshift(function(value) {
// value set from view can only be a known one
modelCtrl.$setValidity('unknown', true);
return value;
});
modelCtrl.$formatters.unshift(function(value) {
var values = valuesFn($scope) || [];
var valid = false;
for (var i = 0; i < values.length; i++) {
var local = {};
local[valueName] = values[i];
if (value === valueFn(local)) {
valid = true;
break;
}
}
modelCtrl.$setValidity('unknown', valid);
return value;
});
}
}
};
}]);