jQuery函数不具有逻辑行为 [英] jquery functions not behaving logically

问题描述

怪异的功能行为.我正在使用父函数，这是相关部分:

Weird function behavior. I'm working in a parent function, here is the relevant portion:

   $("select#" + prefix + "1_" + num).val(smart_cat_data['cat_lvl2_id']);
     Foundation.libs.forms.refresh_custom_select($("select#" + prefix + "1_" + num), true);
     console.log("initial value and change DONE");
     $.when(populateDep.call($("select#" + prefix + "1_" + num)),
     console.log("loading dependent select DONE"),
     console.log("setting " + prefix + "2_" + num + " TO: " + smart_cat_data['cat_lvl3_id'])
     ).then(function(x){
     $("#" + prefix + "2_" + num + " > option").each(function() {
         console.log(this.text + ' ' + this.value);
     });

     $("select#" + prefix + "2_" + num).val(smart_cat_data['cat_lvl3_id']);
     Foundation.libs.forms.refresh_custom_select($("select#" + prefix + "2_" + num), true);
     console.log($("select#" + prefix + "2_" + num).val());
     });

哪个调用:

function populateDep(){
console.log('populateDep');
     id_in_str = $(this).attr('id');
console.log('PROCESSING:' + id_in_str);
     var ctrl = id_in_str.slice(0,3); // the second param is POSITION not LENGTH!
     var this_select = parseInt(id_in_str.slice(3,4), 10); // the second param is POSITION not LENGTH!
     var row = id_in_str.slice(5);

    $.getJSON("/cat_dropdowns",{parent_id: $(this).val(), required: '1', ajax: 'true'}, function(j){
      var options = '';
      for (var i = 0; i < j.length; i++) {
        options += '<option value="' + j[i].value + '">' + j[i].text + '</option>';
      }

    var next_select = ++this_select;
      $("select#" + ctrl + next_select + "_" + row).html(options);

                     $("#" + ctrl + next_select + "_" + row + " > option").each(function() {
                         console.log('populateDep: ' + this.text + ' ' + this.value);
                     });
      Foundation.libs.forms.refresh_custom_select($('#' + ctrl + next_select + "_"  + row), true);
      Foundation.libs.forms.assemble();
console.log('this should be after the selects but before the end');
    });
console.log('populateDep DONE');
}

但是由于某种原因，populateDep中的console.logs在声称已完成之后正在打印.而且这使我选择的选项混乱了，并且不允许我像我所需要的那样自动选择.这是新手吗?我想念什么吗?我包括了萤火虫的图像，因为我认为那是最简单的.

But for some reason, console.logs from populateDep are printing AFTER it claims to be finished. And it's messing with the options of my select and not allowing me to auto-select like I need to. Is this a newbie thing? Am I missing something? I'm including an image of firebug, because I thought that would be easiest.

更新的populateDep:

Updated populateDep:

function populateDep(){
console.log('populateDep');
     id_in_str = $(this).attr('id');
console.log('PROCESSING:' + id_in_str);
     var ctrl = id_in_str.slice(0,3); // the second param is POSITION not LENGTH!
     var this_select = parseInt(id_in_str.slice(3,4), 10); // the second param is POSITION not LENGTH!
     var row = id_in_str.slice(5);

    $.when($.getJSON("/cat_dropdowns",{parent_id: $(this).val(), required: '1', ajax: 'true'}, function(j){
      var options = '';
      for (var i = 0; i < j.length; i++) {
        options += '<option value="' + j[i].value + '">' + j[i].text + '</option>';
      }

    })).then(function(options){
    console.log('starting then');
    var next_select = ++this_select;
      $("select#" + ctrl + next_select + "_" + row).html(options);

     $("#" + ctrl + next_select + "_" + row + " > option").each(function() {
         console.log('populateDep: ' + this.text + ' ' + this.value);
     });
      Foundation.libs.forms.refresh_custom_select($('#' + ctrl + next_select + "_"  + row), true);
      Foundation.libs.forms.assemble();
      console.log('this should be after the selects but before the end');

    });
console.log('populateDep DONE');
}

现在，似乎根本没有填充选择.请注意，$.getJSON已经有一个回调，所以我对正在发生的事情很困惑.

Now, it appears not to be populating the select at all. Please note that $.getJSON has a callback already so I'm pretty confused as to what is going on.

推荐答案

如我在评论中所述，您的方法存在很多问题.

There a quite a few problems in your approach as I explained in the comments.

尝试

$("select#" + prefix + "1_" + num).val(smart_cat_data['cat_lvl2_id']);
Foundation.libs.forms.refresh_custom_select($("select#" + prefix + "1_" + num), true);
console.log("initial value and change DONE");

populateDep.call($("select#" + prefix + "1_" + num)).done(function (x) {
    $("#" + prefix + "2_" + num + " > option").each(function () {
        console.log(this.text + ' ' + this.value);
    });

    $("select#" + prefix + "2_" + num).val(smart_cat_data['cat_lvl3_id']);
    Foundation.libs.forms.refresh_custom_select($("select#" + prefix + "2_" + num), true);
    console.log($("select#" + prefix + "2_" + num).val());
});

function populateDep() {
    console.log('populateDep');
    id_in_str = $(this).attr('id');
    console.log('PROCESSING:' + id_in_str);
    var ctrl = id_in_str.slice(0, 3); // the second param is POSITION not LENGTH!
    var this_select = parseInt(id_in_str.slice(3, 4), 10); // the second param is POSITION not LENGTH!
    var row = id_in_str.slice(5);

    return $.getJSON("/cat_dropdowns", {
        parent_id: $(this).val(),
        required: '1',
        ajax: 'true'
    }, function (j) {
        var options = '';
        for (var i = 0; i < j.length; i++) {
            options += '<option value="' + j[i].value + '">' + j[i].text + '</option>';
        }

        var next_select = ++this_select;
        $("select#" + ctrl + next_select + "_" + row).html(options);

        $("#" + ctrl + next_select + "_" + row + " > option").each(function () {
            console.log('populateDep: ' + this.text + ' ' + this.value);
        });
        Foundation.libs.forms.refresh_custom_select($('#' + ctrl + next_select + "_" + row), true);
        Foundation.libs.forms.assemble();
        console.log('this should be after the selects but before the end');
    });
}

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