aurelia 视图中的过滤器阵列 [英] Filter array in aurelia view

问题描述

我正在使用 aurelia 并希望在视图中而不是在视图模型中过滤集合(数组).

我正在尝试使用以下语法:

<div class="col-sm-7 col-md-7 col-lg-7 ${errors.filter(function(err){return err.Key==='car.Model';}).length >0? 'alert alert-danger' :''}"><span repeat.for="error of errors"><span if.bind="error.Key==='car.Model'">${error.Message}</span></span>

我在浏览器控制台中收到以下错误:

Error: Parser Error: Missing expected ) at column 28 in [errors.filter(function(err){return err.Key==='car.Model';].

这在 angularJS 中是可能的，如下所示:

 
<span class="error" ng-repeat="error in errors | filter:{ Key: 'car.Model'}"><span class="error-message">{{错误信息}}</span></span>

在 aurelia 中是否也可能发生类似的事情?

我也很想知道如何在 aurelia 的 repeat.for 中过滤集合/数组(类似于 ng-repeat).我试图以类似的方式使用过滤器功能，但它也不起作用，我得到了类似的错误.

解决方案

有点尴尬.但是经过一些研究(我应该事先做:P)我得到了答案.

可以使用 ValueConverter 来完成，如下所示:http://jdanyow.github.io/aurelia-converters-样本/.

而且我觉得这很酷.

现在我的代码是这样的:

<div class="col-sm-7 col-md-7 col-lg-7 alert alert-danger" if.bind="errors | hasPropertyValue:'Key':'car.Model'><span repeat.for="error of errors | filterOnProperty:'Key':'car.Model'"><跨度>${error.Message}</span></span>

而且我在 TypeScript 中定义了几个 valueconverters (valueconverters.ts):

导出类 FilterOnPropertyValueConverter {toView(数组:{}[]，属性:字符串，exp:字符串){if (array === undefined || array === null || property === undefined || exp === undefined) {返回数组；}return array.filter((item) => item[property].toLowerCase().indexOf(exp.toLowerCase()) > -1);}}导出类 HasPropertyValueValueConverter {toView(数组:{}[]，属性:字符串，exp:字符串){if (array === undefined || array === null || property === undefined || exp === undefined) {返回假；}return array.filter((item) => item[property].toLowerCase().indexOf(exp.toLowerCase()) > -1).length >0;}}

我最终在我的视图中导入了这些:<import from="yourPath/valueconverters"></import>

I am using aurelia and want to filter a collection (array) in view rather than in view model.

I am trying the following syntax to do so:

<div class="col-sm-7  col-md-7 col-lg-7 ${errors.filter(function(err){return err.Key==='car.Model';}).length >0? 'alert alert-danger' :''}">
            <span repeat.for="error of errors">
                <span if.bind="error.Key==='car.Model'">
                    ${error.Message}
                </span>
            </span>
</div>

And I am getting following error in browser console:

Error: Parser Error: Missing expected ) at column 28 in [errors.filter(function(err){return err.Key==='car.Model';].

This is possible in angularJS as follows:

 <div class="small-7  medium-7 large-7 columns end">
        <span class="error" ng-repeat="error in errors  | filter:{ Key: 'car.Model'}">
            <span class="error-message">
                {{error.Message}}
            </span>
        </span>
    </div>

Is similar thing also possible in aurelia?

I would also love to know how a collection/array can be filtered in repeat.for in aurelia (similar to ng-repeat). I tried to use filter function in similar fashion but it too didn't work and I got similar error.

解决方案

It's a little embarrassing. But after a little research (which I should have done beforehand :P) I have got the answer.

It can be done using ValueConverter as shown here: http://jdanyow.github.io/aurelia-converters-sample/.

And I think it's quite cool.

Now my code looks like this:

<div class="col-sm-7  col-md-7 col-lg-7 alert alert-danger" if.bind="errors | hasPropertyValue:'Key':'car.Model'">
    <span repeat.for="error of errors | filterOnProperty:'Key':'car.Model'">
        <span>
           ${error.Message}
        </span>
    </span>
</div>

And I have defined couple of valueconverters in TypeScript (valueconverters.ts):

export class FilterOnPropertyValueConverter {
toView(array: {}[], property: string, exp: string) {

    if (array === undefined || array === null || property === undefined || exp === undefined) {
        return array;
    }
    return array.filter((item) => item[property].toLowerCase().indexOf(exp.toLowerCase()) > -1);
}
}

export class HasPropertyValueValueConverter {
toView(array: {}[], property: string, exp: string) {

    if (array === undefined || array === null || property === undefined || exp === undefined) {
        return false;
    }
    return array.filter((item) => item[property].toLowerCase().indexOf(exp.toLowerCase()) > -1).length > 0;
}
}

And I finally imported these in my view: <import from="yourPath/valueconverters"></import>

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