需要有关 JS 循环的帮助

发布于 2024-08-26 05:11:00 字数 1210 浏览 4 评论 0原文

我有这样的函数，它添加了一个 droppables 网格：

function AddClassroomDrops(grid, weeks, days, times) {
    for(week = 1; week <= weeks; week++) {
        for (day = 1; day <= days; day++) {
            for (time = 1; time <= times; time++ ) {
                Droppables.add('container_grid'+ grid + '_week' + week + '_day' + day + '_time' + time, {
                    accept: 'pair',
                    hoverclass : 'hovered_receiver',
                    onDrop: function(pair, receiver) {
                        new Ajax.Request(
                          '/pairs/'+pair.id+'/update_on_drop', {
                            method : 'put',
                            parameters : {
                              classroom : grid,
                              week : week,
                              day : day,
                              time : time,
                              container : receiver.id
                            }
                          }
                        );
                      }
                });
            }
        }
     }
}

问题是 Ajax.Request 的参数（周，日，时间）始终等于周 + 1，次 + 1，天 + 1。但它们必须根据循环。哦，是的 - Droppables 来自 script.aculo.us 框架。

原文

I have such function, that adds a grid of droppables:

function AddClassroomDrops(grid, weeks, days, times) {
    for(week = 1; week <= weeks; week++) {
        for (day = 1; day <= days; day++) {
            for (time = 1; time <= times; time++ ) {
                Droppables.add('container_grid'+ grid + '_week' + week + '_day' + day + '_time' + time, {
                    accept: 'pair',
                    hoverclass : 'hovered_receiver',
                    onDrop: function(pair, receiver) {
                        new Ajax.Request(
                          '/pairs/'+pair.id+'/update_on_drop', {
                            method : 'put',
                            parameters : {
                              classroom : grid,
                              week : week,
                              day : day,
                              time : time,
                              container : receiver.id
                            }
                          }
                        );
                      }
                });
            }
        }
     }
}

The problem is that params of Ajax.Request (week, day, time) are always equal to weeks + 1, times + 1, days + 1. But they must vary according to the cycle. Oh, yes - Droppables is from script.aculo.us framework.

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戒ㄋ 2024-09-02 05:11:00

问题出在你对闭包的理解上。封闭函数中的局部变量周、日等的值将是 AddClassroomDrops 执行完成时的最后一个值。避免这种情况的典型方法是返回一个函数并将局部变量传递给另一个函数。例如：

function enclosing()
{
   for(var i = 0; i < 10; i++)
   {
       var f = function(j) { return function closureFunc() { // use j here }; }(i);
       // here you can do Droppables.add(f);
   }
}

The problem is with your understanding of closures. The value of week, day, etc. which are local variables in the enclosing function will be the last value at the time of AddClassroomDrops' completion of execution. The typical way to avoid this is returning a function and passing the local variable to yet another function. For example:

function enclosing()
{
   for(var i = 0; i < 10; i++)
   {
       var f = function(j) { return function closureFunc() { // use j here }; }(i);
       // here you can do Droppables.add(f);
   }
}

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平生欢 2024-09-02 05:11:00

这在萨满舞蹈之后起作用：

function AddClassroomDrops(grid, weeks, days, times) {
    for(week = 1; week <= weeks; week++) {
        for (day = 1; day <= days; day++) {
            for (time = 1; time <= times; time++ ) {
                var drop = function(week, day, time) {
                    Droppables.add('container_grid'+ grid + '_week' + week + '_day' + day + '_time' + time, {
                        accept: 'pair',
                        hoverclass : 'hovered_receiver',
                        onDrop: function(pair, receiver) {
                            new Ajax.Request(
                              '/pairs/'+pair.id+'/update_on_drop', {
                                method : 'put',
                                parameters : {
                                  classroom : grid,
                                  week : week,
                                  day : day,
                                  time : time,
                                  container : receiver.id
                                }
                              }
                            );
                          }
                    });
                 }
              drop(week, day, time);
            }
        }
    }
}

This works after shaman dances:

function AddClassroomDrops(grid, weeks, days, times) {
    for(week = 1; week <= weeks; week++) {
        for (day = 1; day <= days; day++) {
            for (time = 1; time <= times; time++ ) {
                var drop = function(week, day, time) {
                    Droppables.add('container_grid'+ grid + '_week' + week + '_day' + day + '_time' + time, {
                        accept: 'pair',
                        hoverclass : 'hovered_receiver',
                        onDrop: function(pair, receiver) {
                            new Ajax.Request(
                              '/pairs/'+pair.id+'/update_on_drop', {
                                method : 'put',
                                parameters : {
                                  classroom : grid,
                                  week : week,
                                  day : day,
                                  time : time,
                                  container : receiver.id
                                }
                              }
                            );
                          }
                    });
                 }
              drop(week, day, time);
            }
        }
    }
}

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