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在Angular中渲染和过滤长列表时性能降低

[英]Slow performance when rendering and filtering long list in Angular

I've been developing an angular application and have a fairly long list (1600+ rows). 我一直在开发一个角度应用程序,并且有一个相当长的列表(1600多行)。 When downloading the list, my application freezes and takes a really long time (+/- 10 seconds) to display the data. 下载列表时,我的应用程序冻结,并且花费很长时间(+/- 10秒)来显示数据。 I don't think this is right and have found some solutions on the internet. 我认为这不对,并已在互联网上找到了一些解决方案。 These tips however don't seem to affect the loading time. 但是,这些技巧似乎并不影响加载时间。

While loading I had a look at the dev-tools in Google Chrome, which gave me this strange result: 加载时,我查看了Google Chrome浏览器中的开发工具,这给了我一个奇怪的结果:

慢速加载角度

You can see that after loading the application freezes and takes more than 5 seconds to recover. 您会看到加载后应用程序冻结,并且需要5秒钟以上的时间才能恢复。

the function I call here is the following: 我在这里调用的函数如下:

function loadInschrijvingen(activiteit_id, module_id, periode_id, groep_id){
    inschrijvingService.getInschrijvingenById(activiteit_id, module_id, periode_id, groep_id).then(function(response){
        applyInschrijvingen(response);
    });
}

the corresponding service function: 相应的服务功能:

function getInschrijvingenById(activiteit_id, module_id, periode_id, groep_id){
    var request = $http({
    url: API_URL + 'inschrijvingen',
    method: 'GET',
    params: {activiteit_id: activiteit_id, module_id: module_id, periode_id: periode_id, groep_id: groep_id}
        });
   return (request.then(handleSuccess, handleError));
}

the url is just a normal DB query to fetch the rows. 网址只是获取行的常规数据库查询。 Also filtering is a mess. 过滤也是一团糟。 It takes 5 seconds to search the rows, while only filtering the last name. 搜索行需要5秒钟,而仅过滤姓氏。

<input type="text" placeholder="zoeken op achternaam" ng-model="inschrijving.achternaam" ng-model-options="{debounce: 500}">


<tr class="fold new" ng-repeat="inschrijving in inschrijvingen | filter: inschrijving  track by inschrijving.id">
    <td>@{{$index+1}}</td>
    <td><span ng-click="toggle('edit', inschrijving.id)"></span></td>
    <td><span ng-click="confirmMail(inschrijving.id)" title="Inschrijvingsmail herzenden"></span></td>
    <td><span ng-click="confirmReminder(inschrijving.id)" title="Betalingsherinnering verzenden"></span></td>
    <td><span ng-click="confirmDelete(inschrijving.id)"></span></td>
    <td>@{{inschrijving.voornaam}} @{{inschrijving.achternaam}}</td>
    <td><a href="mailto:@{{inschrijving.email}}">@{{inschrijving.email}}</a></td>
    <td>@{{inschrijving.geboortedatum | date:'dd/MM/yyyy'}}</td>
    <td><i class="fa" ng-class="{'fa-male': inschrijving.geslacht == 'man', 'fa-female': inschrijving.geslacht == 'vrouw'}"></i></td>
    <td>@{{inschrijving.straat}}, @{{inschrijving.postcode}} @{{inschrijving.gemeente}} </td>
    <td>@{{inschrijving.gsm}}</td>
    <td><input type="checkbox" ng-model="inschrijving.betaald" ng-true-value="1" ng-false-value="0" ng-checked="inschrijving.betaald == 1" ng-change="setState(inschrijving.id, 'postBetaald')"></td>
    <td>
    <select name="betalingswijze" id="betalingswijze" ng-model="inschrijving.betalingswijze" ng-change="setState(inschrijving.id, 'postBetalingswijze')">
        <option value="0" ng-selected="inschrijving.betalingswijze == 0">Geen</option>
        <option value="1" ng-selected="inschrijving.betalingswijze == 1">Cash</option>
        <option value="2" ng-selected="inschrijving.betalingswijze == 2">Overschrijving</option>
    </select>
    </td>
    <td><input class="bedrag" type="text" value="@{{inschrijving.bedrag}}" ng-model="inschrijving.bedrag" ng-change="setState(inschrijving.id, 'postBedrag')" ng-model-options='{ debounce: 1000 }'></td>
    <td><input type="checkbox" ng-model="inschrijving.fotos" ng-true-value="1" ng-false-value="0" ng-checked="inschrijving.fotos == 1" ng-change="setState(inschrijving.id, 'postFotos')"></td>
    <td>
    <select name="tshirtmaat" id="tshirtmaat" ng-model="inschrijving.tshirtmaat" ng-change="setState(inschrijving.id, 'postTshirtmaat')" >
        <option value="" ng-selected="inschrijving.tshirtmaat == ''"></option>
        <option value="92" ng-selected="inschrijving.tshirtmaat == 92">92</option>      
        <option value="L" ng-selected="inschrijving.tshirtmaat == 'L'">L</option>
    </select>
    </td>
    <td>@{{inschrijving.opmerkingen}}</td>
</tr>

I'm really stuck with this, so if anyone could help me out? 我真的很坚持,所以如果有人可以帮助我吗?

I would suggest breaking down your application part by part, until you find the culprit. 我建议您逐一分解您的应用程序,直到找到罪魁祸首。

  • My first thing to try would be to remove the filter completely and see how that affects the load times/freezing 我要尝试的第一件事是完全移除过滤器,看看它如何影响加载时间/冻结

  • Try removing any other requests on the page (eg the fonts you are loading etc) to rule out any external factors. 尝试删除页面上的任何其他请求(例如,正在加载的字体等)以排除任何外部因素。

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