如何根据另一个下拉值自动选择选项? [英] How to auto select option depending on another dropdowns value?
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问题描述
我有三个下拉菜单.我想要的是当我选择前两个下拉值时,这些信息与第三个下拉列表匹配并动态更新.如果我选择M"和红色"第三个下拉菜单将显示M/Red".
I have three dropdowns. What I want is when I select the first two dropdown values, those information match with the third dropdown and update dynamically. If I select "M" and "Red" the third dropdown would show the "M / Red".
$(document).ready(function () {
$('.variant').change(function(){
var size = $(this).children(":selected").val();
if (size != "" && size !== null)
{
var itm =size + " / " + size;
$('select[name="id"]option[value=' + itm + ']').attr('selected',true);
}
});
<form action="#" method="post">JSLint
<select class="variant">
<option value="S">S</option>
<option value="M">M</option>
<option value="L">L</option>
</select>
<select class="variant">
<option value="Grey">Grey</option>
<option value="Red">Red</option>
<option value="White">White</option>
</select>
<br>
<select id="data">
<option value="S / Grey">S / Grey</option>
<option value="M / Grey">M / Grey</option>
<option value="L / Grey">L / Grey</option>
<option value="S / Red">S / Red</option>
<option value="M / Red">M / Red</option>
<option value="L / Red">L / Red</option>
<option value="S / White">S / White</option>
<option value="M / White">M / White</option>
<option value="L / White">L / White</option>
</select>
</form>
推荐答案
您可以使用 .get()
和 .map()
从下拉列表和然后使用 :contains()
在 data
选择框中设置选定的值.
You can use .get()
and .map()
to get selected values from dropdown and then use :contains()
to set selected value in data
select-box.
演示代码:
$('.variant').change(function() {
var size = $(".variant").get().map(function(el) {
return el.value
}).join(" / "); //get value of slected options and then join
$("select#data > option:contains(" + size + ")").prop('selected', true); //set selected value
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script>
<form action="#" method="post">JSLint
<select class="variant">
<option value="S">S</option>
<option value="M">M</option>
<option value="L">L</option>
</select>
<select class="variant">
<option value="Grey">Grey</option>
<option value="Red">Red</option>
<option value="White">White</option>
</select>
<br>
<select id="data">
<option value="S / Grey">S / Grey</option>
<option value="M / Grey">M / Grey</option>
<option value="L / Grey">L / Grey</option>
<option value="S / Red">S / Red</option>
<option value="M / Red">M / Red</option>
<option value="L / Red">L / Red</option>
<option value="S / White">S / White</option>
<option value="M / White">M / White</option>
<option value="L / White">L / White</option>
</select>
</form>
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