如何动态删除localStorage中的单个项目

时间:2013-09-09 09:32:36

标签: jquery listview checkbox local-storage

我尝试使用jquery从localStorage中删除单个项目。在这里,我将listivew中的每个项目添加复选框以删除已选中的复选框,这些项目必须从localStorage中删除,但它无法正常工作。

更新代码

$(document).ready( function() {
    $("#section_list").on('click', 'a', function() {
                var item = $(this).find('h2').text();
                var desc = $(this).find('p').text();
                var html = '<p></br><p class="description">' + desc + '</p>';
                $('.addToFavoritesDiv').click(function() {
                    var url = $(location).attr('href');
                    if (!supportLocalStorage())
                    {
                        item = 'No support';
                    }
                    else
                    {
                        try
                            {
                                localStorage.setItem('autosave' + url, item + html);

                            }
                        catch (e)
                            {
                                if (e == QUOTA_EXCEEDED_ERR)
                                {
                                    alert('Quota Exceeded');
                                }
                            }   
                    }
                });
    });

    $('#fav').click(function() {
        fromStorage();
        $("#favoritesList").listview('refresh');
    }); 

    $(document).on('click', '#edit', function() {
        fromGetStorage();
    });
});

function supportLocalStorage()
{       
    return typeof(Storage) !== 'undefined';
}

function fromStorage()
{
    $("#favoritesList").empty();
    $("#favoritesList").listview('refresh');
    for (var i = 0; i < localStorage.length; i++) {
        var url = localStorage.key(i);
            var item = localStorage.getItem(url);
            $("#favoritesList").append('<li id="add"><a href="' + url + '" style="text-decoration:none;color:black">' + item  + '</a></li>').attr('url', url);
    }
    $("#favoritesList").listview('refresh');
}

function fromGetStorage() 
    {   
     $("#favoritesList").empty();  
     $("#favoritesList").append('<input type="checkbox" name="all" id="select" />Select all</br>');
     $("#fav .ui-listview-filter").remove();
        for (var i = 0; i < localStorage.length; i++) {
        var url = localStorage.key(i);
         var item = localStorage.getItem(url);
          $("#favoritesList").append('<li id="add"><div><input type="checkbox" name="check" id="check">&nbsp;<a href="' + url + '" style="text-decoration:none;color:black">' + item + '</a></div></li>').attr('url', url);
        $("#favoritesList").listview('refresh');
 }

$("#select").click(function(event){
    event.stopPropagation();
});
    $('#select').change(function() {
    if($("#select").is(':checked')) {
        $("#add #check").prop("checked", true);
        $('#empty').on('click', function() {
            localStorage.clear();
        $("#favoritesList").listview('refresh');
        });
    }
    else {
        $("#add #check").prop("checked", false);
    }
 });


$("#add #check").click(function(event){
    event.stopPropagation();
});

    $("#add #check").change(function() {
        var chkLength = $('input[name="check"]:checkbox').length;
        var chkdLength = $('input[name="check"]:checkbox:checked').length;
        if (chkLength == chkdLength)
        {
            $('#select').prop('checked', true);
            $('#empty').on('click', function() {
                localStorage.clear();
                $("#favoritesList").listview('refresh');
            });
        }
        else 
        {
            $('#select').prop('checked', false);
        }
        $("#delete").on('click', function() {
                var checked = $('#add #check:checkbox:checked');
                    var url = localStorage.key(checked);
                    localStorage.removeItem(url);
                    $("#favoritesList").listview('refresh');
            $("#favoritesList").listview('refresh');
        });

});

} 

先谢谢。

2 个答案:

答案 0 :(得分:30)

您使用布尔值作为键吗?它不会起作用。

应该是:

localStorage.removeItem('keyName');

delete window.localStorage["keyName"]

答案 1 :(得分:2)

如果您正在考虑数字键,这里似乎有用。

var elems = -1;
var deleteElem;

然后循环遍历本地存储以查找您要查找的任何元素(在本例中为第一个):

$.each( localStorage, function( key,value ){
    elems++;
    // define which element to delete
    if(elems == 0){ deleteElem = key }
});

现在您已获得所需的密钥,只需将其删除:

localStorage.removeItem(deleteElem);