我无法在父组(' .other-row')中获取div(' .option-other')以显示/隐藏相应的内容选择元素的选项(' .select-toggle')。现在,如果"其他"从问题集1或2中选择它将显示' .option-other' div的。我尝试使用.parent()和.closest()as described in this solution,但似乎无法找到在此用例中使用它的正确方法。
$(".select-toggle").change(function() {
var oth = false;
$(".select-toggle option:selected").each(function() {
if ($(this).val() == "other") oth = true;
});
if (oth) $('.option-other').show();
else $('.option-other').hide();
// tried this method as well but still doesnt work
// if (oth) $(this).closest('.other-row').children('.option-other').show();
// else $(this).closest('.other-row').children('.option-other').hide();
}).change();

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<!-- Question set 1 -->
<div class="wrapper other-row">
<div class="col">
<div class="form-group">
<label>What stuff do you eat?</label>
<select class="select-toggle" multiple>
<option>Pizza</option>
<option>Cake</option>
<option value="other">Other</option>
</select>
</div>
</div>
<div class="col">
<div class="form-group option-other">
<label>Other</label>
<input type="text" placeholder="what other stuff do you like" />
</div>
</div>
</div>
<!-- Question set 2 -->
<div class="wrapper other-row">
<div class="col">
<div class="form-group">
<label>What stuff do you drink?</label>
<select class="select-toggle" multiple>
<option>Water</option>
<option>Soda</option>
<option value="other">Other</option>
</select>
</div>
</div>
<div class="col">
<div class="form-group option-other">
<label>Other</label>
<input type="text" placeholder="what other stuff do you like" />
</div>
</div>
</div>
&#13;
答案 0 :(得分:1)
// you wrote:
// tried this method as well but still doesnt work
// if (oth) $(this).closest('.other-row').children('.option-other').show();
// else $(this).closest('.other-row').children('.option-other').hide();
您已离婚,但$.children
仅选择每个.other-row
的直接子女。由于.option-other
位于.col
内的.other-row
内,$.children
无法看到它。请改用$.find
。
// your original code:
var oth = false;
$(".select-toggle option:selected").each(function() {
if ($(this).val() == "other") oth = true;
});
这为整个页面设置了一个可见性值:如果在任何地方选择了至少一个“其他”选项,则显示 all 文本输入。 change
事件会针对实际发生变化的<select>
触发,因此请将注意力集中在那里:
var oth = false;
$(this).children("option:selected").each(function() {
if ($(this).val() == "other") oth = true;
});
if (oth) $(this).closest('.other-row').find('.option-other').show();
else $(this).closest('.other-row').find('.option-other').hide();
这样可行,但它可能更干净。显示或隐藏基于布尔值的元素是jQuery具有以下功能的常见要求:$.toggle
。您可以使用
if/else
行
$(this).closest('.other-row').find('.option-other').toggle(oth);
您的$.each
循环做了一件事:如果至少有一个选定的oth
值<option>
,则设置"other"
。您可以使用attribute selector:
var oth = ($(this).find('option:checked[value="other"]').length !== 0);
(我已将:selected
更改为:checked
,因为您已经过滤了option
元素和:selected
has a performance penalty。)
最终版本:
$(".select-toggle").change(function() {
var oth = ($(this).find('option:checked[value="other"]').length !== 0);
$(this).closest('.other-row').find('.option-other').toggle(oth);
}).change();
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<!-- Question set 1 -->
<div class="wrapper other-row">
<div class="col">
<div class="form-group">
<label>What stuff do you eat?</label>
<select class="select-toggle" multiple>
<option>Pizza</option>
<option>Cake</option>
<option value="other">Other</option>
</select>
</div>
</div>
<div class="col">
<div class="form-group option-other">
<label>Other</label>
<input type="text" placeholder="what other stuff do you like" />
</div>
</div>
</div>
<!-- Question set 2 -->
<div class="wrapper other-row">
<div class="col">
<div class="form-group">
<label>What stuff do you drink?</label>
<select class="select-toggle" multiple>
<option>Water</option>
<option>Soda</option>
<option value="other">Other</option>
</select>
</div>
</div>
<div class="col">
<div class="form-group option-other">
<label>Other</label>
<input type="text" placeholder="what other stuff do you like" />
</div>
</div>
</div>
Vanilla JS版:
document.querySelectorAll('.select-toggle').forEach(el => {
el.addEventListener('change', evt => {
const oth = evt.target.querySelector('option:checked[value="other"]');
evt.target
.closest('.other-row')
.querySelector('.option-other')
.style.display = (oth ? '' : 'none');
});
// trigger change event programmatically
const event = document.createEvent('HTMLEvents');
event.initEvent('change', true, false);
el.dispatchEvent(event);
});
答案 1 :(得分:0)
这是一个有点笨重的解决方案,但我做得相对较快。这是一种解决方法,因为必须知道选择了哪一个具有相同类别的选择器。
以下是使用您的代码的工作示例。
$(".select-toggle").change(function () {
var oth = false;
$(".select-toggle option:selected").each(function () {
if ($(this).val() == "otherFood") {
oth = true;
$('.option-other-food').show();
} else {
$('.option-other-food').hide();
};
if ($(this).val() == "otherDrink") {
oth = true;
$('.option-other-drink').show();
} else {
$('.option-other-drink').hide();
};
});
}).change();
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<!-- Question set 1 -->
<div class="wrapper other-row">
<div class="col">
<div class="form-group">
<label>What stuff do you eat?</label>
<select class="select-toggle" multiple>
<option>Pizza</option>
<option>Cake</option>
<option value="otherFood">Other</option>
</select>
</div>
</div>
<div class="col">
<div class="form-group option-other-food">
<label>Other</label>
<input type="text" placeholder="what other stuff do you like"/>
</div>
</div>
</div>
<!-- Question set 2 -->
<div class="wrapper other-row">
<div class="col">
<div class="form-group">
<label>What stuff do you drink?</label>
<select class="select-toggle" multiple>
<option>Water</option>
<option>Soda</option>
<option value="otherDrink">Other</option>
</select>
</div>
</div>
<div class="col">
<div class="form-group option-other-drink">
<label>Other</label>
<input type="text" placeholder="what other stuff do you like"/>
</div>
</div>
</div>
干杯!