在调用函数后保持Javascript不变

时间:2015-10-16 16:11:26

标签: javascript global-variables constants dynamic-list

我正在尝试创建动态列表,因此当用户执行搜索时,它将重新填充列表。问题是我似乎无法创建一个不可变的常量来存储原始的div内容。每次调用函数时,此变量都会重新初始化。

有没有办法在不使用Cookie的情况下实现这一目标?任何帮助都是真诚的感谢。代码不完整,因为我无法通过这一步,但如果你认为我完全朝着错误的方向前进,请告诉我。

const originalList = document.getElementById('patientList')。getElementsByTagName('li'); frozen = Object.freeze(originalList);

  <script>
    const originalList = document.getElementById('patientList').getElementsByTagName('li');
    frozen = Object.freeze(originalList);
    var newList = '';
    var found = false;
    function filterPatients(){
        var searchQuery = document.getElementById('search');
        var query = searchQuery.value;
        var listContainer = document.getElementById('patientList');
        var patientList = listContainer.getElementsByTagName('li');
        for (var i = 0; i < originalList.length; i++){
            var link = patientList[i].getElementsByTagName('a');
            var link = link[0].text;
            /** remove whitespaces for easy comparison **/
            link = link.toLowerCase();
            query = query.toLowerCase();
            link = link.replace(/\s/g, "");
            query = query.replace(/\s/g, "");

            /** check every character in query **/
                if (link.length > query.length && link.substring(0,query.length) == query){
                    found = true;
                    newList += '<li>' + patientList[i].innerHTML + '</li>';
                }
        }
        if (found == true){
            listContainer.innerHTML = newList;
            newList = '';
        }
        else{
            listContainer.innerHTML = "<li>No patient by that name</li>";
        }
        console.log(frozen);

    }

</script>

1 个答案:

答案 0 :(得分:0)

const originalList = document.getElementById('patientList').getElementsByTagName('li').cloneNode(true);

使originalList成为元素的副本。目前,您将originalList和patientList设置为相同的元素列表,因此更改一个元素也将更改另一个元素。使用element.cloneNode(true)制作DOM元素的深层副本