AngularJs - 将一个 ng-model 绑定到具有两个输入的指令 [英] AngularJs - bind one ng-model to directive with two inputs

问题描述

如何创建一个 range 指令，该指令绑定到一个 ng-model 并使用 filterinput 字段代码>(已经制作).基本上我有一个方向从模型到输入工作，但另一方面从输入到模型没有.如何实现这一目标?

我有这个 Html:

还有一个模型:

var任意模型=10/22"；

旁注；我创建了一个过滤器来拆分这两个值:
{{ feature.Value |拆分:\'/\':0}}

还有这个指令:

.directive('tuRange', function($compile) {返回 {限制:'A'，要求:'ngModel'，范围: {特征:="，tudisabled: '=',模型:'=ngModel'//已编辑},模板:'<input type="text" '+'ng-value="{{ model | split:\'/\':0}}"/>'+//编辑为 'model''-<输入类型="文本" '+'ng-value="{{ model | split:\'/\':1}}"/>',//编辑为 'model'链接:函数(范围、元素、属性、ngModel){}};})

解决方案

正确的方法 (IMO) 是创建自定义控件，如此处.

作为练习，我在这个 fiddle 中实现了它:http://jsfiddle.net/6cn7y/

指令的代码是(你可能需要修改一些细节):

app.directive("range", function() {变量 ID=0;函数constructRangeString(从，到){变量结果；if( !from && !to ) {结果 = 空；}否则如果(来自){结果 = from + "/" + (to || "");}否则如果(到){结果=/"+到；}返回结果；}返回 {要求:ngModel"，限制:E"，替换:真的，范围: {姓名: "@"},模板:'<div ng-form="{{ subFormName }}">'+'<input type="text" ng-model="from" class="range-from"/>'+'<input type="text" ng-model="to" class="range-to"/>'+'</div>',链接:功能(范围，元素，属性，ngModel){var re =/([0-9]+)\/([0-9]+)/;如果(范围.名称){scope.subFormName = scope.name;}别的 {scope.subFormName = "_range" + ID;身份证++；}ngModel.$render = function() {var 结果，从，到；结果 = re.exec(ngModel.$viewValue);如果(结果){from = parseInt(result[1]);to = parseInt(result[2]);}scope.from = from;scope.to = 到；};scope.$watch("from", function(newval) {var 结果=constructRangeString(newval, scope.to);ngModel.$setViewValue(result);});scope.$watch("to", function(newval) {var 结果=constructRangeString(scope.from, newval);ngModel.$setViewValue(result);});}};});

它的用法是:

<小时>

我怀疑过滤器会让你在任何地方使用它，因为它们不进行双向绑定.

<小时>

EDIT:即使这解决了问题，我还是建议采用稍微不同的方法.我会将 range 指令的模型定义为一个对象:

<代码>{从: ...，到:   ...}

这意味着示例中 ctrl.theRange 变量中的输出将是一个与上述类似的对象.如果您真的想要字符串格式 "from/to"，请在 ngModel 管道中添加解析器/格式化程序，即 constructRangeString() 函数.使用解析器/格式化程序，ctrl.theRange 变量获得所需的字符串格式，同时保持代码更加模块化(constructRangeString() 函数在指令外部)和参数化程度更高(模型采用易于处理和转换的格式).

还有一个概念证明:http://jsfiddle.net/W99rX/

How to create a range directive which binds to one ng-model and outputs two input fields using a filter (already made). Essentially I've got one direction from model to input working, but the other side from input to model not. How to achieve this?

I've got this Html:

<div tu-range ng-model="arbitraymodel" />

And a model:

var arbitrarymodel = "10/22";

Side note; I created a filter to split those two values:
{{ feature.Value | split:\'/\':0}}

And this directive:

.directive('tuRange', function($compile) {
    return { 
        restrict: 'A',
        require: 'ngModel',
        scope: {
            feature: '=',
            tudisabled: '=',
            model: '=ngModel' // edited
        },
        template: '<input type="text" '+
               'ng-value="{{ model | split:\'/\':0}}" />'+ // edited to 'model'
             '-<input type="text" '+
               'ng-value="{{ model | split:\'/\':1}}" />', // edited to 'model'
        link: function(scope, element, attributes, ngModel) {

        }
    };
})

解决方案

The correct way (IMO) is to create a custom control as described here.

As an exercise, I implemented it in this fiddle: http://jsfiddle.net/6cn7y/

The code of the directive is (you may need to adapt some details):

app.directive("range", function() {
    var ID=0;

    function constructRangeString(from, to) {
        var result;
        if( !from && !to ) {
            result = null;
        }
        else if( from ) {
            result = from + "/" + (to || "");
        }
        else if( to ) {
            result = "/" + to;
        }
        return result;
    }

    return {
        require: "ngModel",
        restrict: "E",
        replace: true,
        scope: {
            name: "@"
        },
        template:
            '<div ng-form="{{ subFormName }}">' +
                '<input type="text" ng-model="from" class="range-from" />' +
                '<input type="text" ng-model="to" class="range-to" />' +
            '</div>',
        link: function(scope,elem,attrs,ngModel) {
            var re = /([0-9]+)\/([0-9]+)/;

            if( scope.name ) {
                scope.subFormName = scope.name;
            }
            else {
                scope.subFormName = "_range" + ID;
                ID++;
            }

            ngModel.$render = function() {
                var result, from, to;
                result = re.exec(ngModel.$viewValue);
                if( result ) {
                    from = parseInt(result[1]);
                    to = parseInt(result[2]);
                }
                scope.from = from;
                scope.to = to;
            };

            scope.$watch("from", function(newval) {
                var result = constructRangeString(newval, scope.to);
                ngModel.$setViewValue(result);
            });
            scope.$watch("to", function(newval) {
                var result = constructRangeString(scope.from, newval);
                ngModel.$setViewValue(result);
            });
        }
    };
});

And its usage would be:

<range ng-model="ctrl.theRange" name="myRange" required="true"></range>

---

I doubt the filters will get you anywhere with this, as they do not do 2-way binding.

---

EDIT: Even though this solves the problem, I would suggest a slightly different approach. I would define the model of the range directive as an object:

{
    from: ...,
    to:   ...
}

This means that the output in the ctrl.theRange variable in the example would be an object like that of the above. If you really want the string format "from/to", add a parser/formatter in the ngModel pipelines, i.e. the constructRangeString() function. Using the parser/formatter, the ctrl.theRange variable gets the desired string format, while keeping the code more modularized (the constructRangeString() function is external to the directive) and more parameterized (the model is in a format that can easilly be processed and transformed).

And a proof of concept: http://jsfiddle.net/W99rX/

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