Question

我尝试获取具有最大NumVotes值的“值”字符串。之后，我想做简单的断言（我知道该怎么做），但是我在获取此“值”时遇到了问题。我对此没有想法和知识。

<script>
    var templates = [
        @foreach ($templates->pluck('id', 'html')->toArray() as $k => $v)
            '{{ $v }}',
        @endforeach
        ];
    $(document).ready(function(){
        $('#templates').on('change', function (e) {
            var valueSelected = this.value;
            console.log(templates[valueSelected]);
        });
    });
</script>

<div class="input-select">
    {!! Form::select('templates', $templates->pluck('html', 'id')->toArray(), null, ['class' => 'form-control', 'id' => 'templates', 'placeholder' => 'Select a template']) !!}
</div>

当前输出：

public class DomParserDemo {

    public static void main(String[] args) {

        try {

            DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder dbBuilder = dbFactory.newDocumentBuilder();
            InputSource is = new InputSource(new StringReader("<poll name=\"language_dependence\" title=\"Language Dependence\" totalvotes=\"170\"><results><result level=\"1\" value=\"No necessary in-game text\" numvotes=\"168\"/><result level=\"2\" value=\"Some necessary text - easily memorized or small crib sheet\" numvotes=\"0\"/><result level=\"3\" value=\"Moderate in-game text - needs crib sheet or paste ups\" numvotes=\"0\"/><result level=\"4\" value=\"Extensive use of text - massive conversion needed to be playable\" numvotes=\"0\"/><result level=\"5\" value=\"Unplayable in another language\" numvotes=\"2\"/></results></poll>"));
            Document doc = dbBuilder.parse(is);
            doc.getDocumentElement().normalize();
            System.out.println("Root element :" + doc.getDocumentElement().getNodeName());
            NodeList nodeList = doc.getElementsByTagName("result");

            for (int i = 0; i < nodeList.getLength(); i++) {
                Element element = (Element) nodeList.item(i);

                System.out.println("Level = "+ element.getAttribute("level")+", "+
                        "Value = "+element.getAttribute("value")+", "+
                        "NumVotes = "+element.getAttribute("numvotes"));
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

Answer 1

您已经在迭代所有元素。仅通过使用变量跟踪到目前为止的最大值并将其与每个值进行比较，即可通过元素属性之一找到最大值。您的for循环已被修改：

String targetValue = "";
int maxNumVotes = 0;
for (int i = 0; i < nodeList.getLength(); i++) {
    Element element = (Element) nodeList.item(i);
    int numVotes = Integer.parseInt(element.getAttribute("numvotes"));
    if (numVotes > maxNumVotes) {
        maxNumVotes = numVotes;
        targetValue = element.getAttribute("value");
    }
}
System.out.println("Value: " + targetValue + " NumVotes: " + maxNumVotes);

但是，如果要按投票数对元素进行排序，请将元素添加到列表中，并使用比较器按投票数或任何其他字段进行排序。

如何从for循环中获取指定的属性？

1 个答案: