我有以下数据集
array:4 [
"data" => array:2 [
2015 => array:2 [
"english" => array:1 [
"chips" => array:1 [
0 => "img1.png"
]
]
"french" => array:1 [
"mussles" => array:1 [
0 => "img1.png"
]
]
]
2016 => array:2 [
"indian" => array:1 [
"madras" => array:1 [
0 => "img1.png"
]
]
"italien" => array:1 [
"pasta" => array:1 [
0 => "img1.png"
]
]
]
]
]
为了正确显示正确的数据,请执行以下操作
<select id="year" class="form-control">
@foreach($fileData["data"] as $year => $countries)
<option value="{{ $year }}">{{ $year }}</option>
@endforeach
</select>
<select id="country" class="form-control hide">
@foreach($fileData["data"] as $year => $countries)
@foreach ($countries as $country => $dishes)
<option class="year-{{ $year }} hide" value="{{ $country }}">{{ $country }}</option>
@endforeach
@endforeach
</select>
<select id="dish" class="form-control hide">
@foreach($fileData["data"] as $year => $countries)
@foreach ($countries as $country => $dishes)
@foreach ($dishes as $dish => $images)
<option class="year-{{ $year }} country-{{ $country }} hide" value="{{ $dish }}">{{ $dish }}</option>
@endforeach
@endforeach
@endforeach
</select>
因此,第二个和第三个选择将被隐藏,直到选择前一个选择 在JavaScript中我做
var getSelectedYear = function() {
return $("#year option:selected").val();
}
var getSelectedCountry = function() {
return $("#country option:selected").val();
}
$('#year').change(function() {
$("#country option.year-" + getSelectedYear()).removeClass('hide');
$("#country").removeClass('hide');
})
$('#country').change(function() {
$("#dish option.year-" + getSelectedYear() + ".country-" + getSelectedCountry()).removeClass('hide');
$("#dish").removeClass('hide');
})
因此,如果我在第一个选择中选择2015,则第二个选择将显示英语和法语。如果我然后选择英语,第三个选择将显示筹码。
一切正常。我的问题是这个。如果我选择2015,英语和筹码,然后将英语改为法语,第三个选择选项现在显示筹码和麻烦而不仅仅是麻烦。所以按顺序完成它可以正常工作,但是一旦你改变了一些东西,我需要在动态填充它们之前重置以下选择选项。
有没有办法实现这个目标?
答案 0 :(得分:1)
如果在取消隐藏所需的选项之前隐藏所有其他选项呢?
$('#year').change(function() {
// hides all the options
$("#county option").addClass("hide");
$("#country option.year-" + getSelectedYear()).removeClass('hide');
$("#country").removeClass('hide');
// gets the value of the first available option and resets your dropdown to that
var first_val = $("#country option:not('.hide')").first().val();
$("#country").val(first_val);
// manually trigger the change so that it propagates to the following dropdown
$("#country").trigger("change");
})
$('#country').change(function() {
// hides all the options
$("#dish option").addClass("hide");
$("#dish option.year-" + getSelectedYear() + ".country-" + getSelectedCountry()).removeClass('hide');
$("#dish").removeClass('hide');
// gets the value of the first available option and resets your dropdown to that
var first_val = $("#dish option:not('.hide')").first().val();
$("#dish").val(first_val);
})
这会将“隐藏”类添加到所有可用选项中,然后仅取消隐藏您希望可用的特定选项。此外,它会选择第一个可用选项,因此您不会留下陈旧的下拉列表。