AngularJS - 在 ng-repeat 中使用 indexOf 来显示/隐藏值答案

【问题标题】：AngularJS - Using indexOf inside ng-repeat to show/hide valuesAngularJS - 在 ng-repeat 中使用 indexOf 来显示/隐藏值
【发布时间】：2014-12-10 08:20:03
【问题描述】：

我有一个包含一堆数据的JSON 文件：

我的数据.JSON：

{
"Addresses": {
    "AddressList": [
        {
            "HouseNumber": 201,
            "Street": "Victoria Lane",
            "Postcode": "SW1 8ES"
        },
        {
            "HouseNumber": 10,
            "Street": "Allen Close",
            "Postcode": "NG2 3TD"
        },
        {
            "HouseNumber": 57,
            "Street": "Thomas Street",
            "Postcode": "DR12 6TE"
        },
        {
            "HouseNumber": 57,
            "Street": "Old Lister Street",
            "Postcode": "OL4 5TH"
        },
        {
            "HouseNumber": 45,
            "Street": "Milk Round Street",
            "Postcode": "MK6 4HG"
        },
        {
            "HouseNumber": 102,
            "Street": "Jersey Quarter Avenue",
            "Postcode": "DR12 6TE"
        },
        {
            "HouseNumber": 845,
            "Street": "MR HAPPY STREET",
            "Postcode": "MR3 0FJ"
        }
    ]
}

如果通过 indexOf 找到来自 Street 的返回值的匹配项，我会尝试显示 div

HTML：

<div ng-repeat="address in Addresses.AddressList">
    {{ address.HouseNumber }}, {{ address.Street}}, {{ address.Postcode }}
    <div ng-show="address.Street.toLowerCase().indexOf('MR HAPPY STREET') == 0">
        MR HAPPY STREET WAS FOUND
    </div>
    <div ng-show="address.Street.toLowerCase().indexOf('Milk Round Street') == 0">
        Milk Round Street WAS FOUND
    </div>
</div>

这似乎不起作用。你可以通过ng-show 执行这样的indexOf 吗？

【问题讨论】：

标签： angularjs angularjs-scope angularjs-ng-repeat ng-show ng-hide

【解决方案1】：

使用这个

<div ng-repeat="address in Addresses.AddressList">
    {{ address.HouseNumber }}, {{ address.Street}}, {{ address.Postcode }}
    <div ng-show="showByJs(address,'MR HAPPY STREET')">
        MR HAPPY STREET WAS FOUND
    </div>
    <div ng-show="showByJs(address,'Milk Round Street')">
        Milk Round Street WAS FOUND
    </div>
</div>

在控制器中写入

    $scope.showByJs=function(address, indexofWord){
    if (address.Street.toLowerCase().indexOf(indexofWord) == 0)
    {
       return true;
    }else
     {
       return false
}
    }

【讨论】：

【解决方案2】：

您需要检查 "MR HAPPY STREET" 和 "Milk Round Street" 的小写字母，因为您正在尝试与 address.Street 的小写字母进行比较。

<div ng-repeat="address in Addresses.AddressList">
    {{ address.HouseNumber }}, {{ address.Street}}, {{ address.Postcode }}
    <div ng-show="address.Street.toLowerCase().indexOf(('MR HAPPY STREET').toLowerCase()) == 0">
        MR HAPPY STREET WAS FOUND
    </div>
    <div ng-show="address.Street.toLowerCase().indexOf(('Milk Round Street').toLowerCase()) == 0">
        Milk Round Street WAS FOUND
    </div>
</div>

【讨论】：

【解决方案3】：

您的问题是您比较了两个不相同的字符串：使用toLowerCase() 函数后，您的字符串Milk Round Street 看起来像milk round street。所以indexOf() 将返回-1。这就是为什么您需要比较 2 个小写字符串，例如：

<div ng-show="address.Street.toLowerCase().indexOf('mr happy street') == 0">

或：

<div ng-show="address.Street.toLowerCase().indexOf(('MR HAPPY STREET').toLowerCase()) == 0">

【讨论】：