[英]How to calculate value from select fields?
我從此處舉了一個例子http://tympanus.net/codrops/2012/11/29/simple-effects-for-drop-down-lists/ , 演示4
一切正常,但是我無法弄清楚如何從選擇列表值中計算總和並在頁面末尾提取。 我試圖用這段代碼來做到這一點,但它不起作用
<section class="main clearfix">
<div class="fleft">
<select id="cd-dropdown" class="cd-select">
<option value="-1" selected>Choose a weather condition</option>
<option value="1" class="icon-sun">Sun</option>
<option value="2" class="icon-cloudy">Clouds</option>
<option value="3" class="icon-weather">Snow</option>
<option value="4" class="icon-rainy">Rain</option>
<option value="5" class="icon-windy">Windy</option>
</select>
</div>
<input type="text" id="sum">
</section>
$( function() {
$( '#cd-dropdown' ).dropdown( {
gutter : 5,
delay : 40,
rotated : 'left'
} );
});
</script>
<script type="text/javascript">
$("#cd-dropdown").change(function() {
var total = 0;
$.each($(".cd-select") ,function() {
total += parseInt($(this).val());
});
$("#sum").val(total)});
`
先感謝您 !
$(document).ready(function () {
$(".cd-select").change(function () {
total = 0;
$('.cd-select').each(function () {
if ($(this).val() != "-1") {
total = total + parseInt($(this).val(), 10);
}
});
$('#sum').val(total);
});
});
<div class="fleft">
<select id="cd-dropdown" class="cd-select">
<option value="-1" selected>Choose a weather condition</option>
<option value="1" class="icon-sun">Sun</option>
<option value="2" class="icon-cloudy">Clouds</option>
<option value="3" class="icon-weather">Snow</option>
<option value="4" class="icon-rainy">Rain</option>
<option value="5" class="icon-windy">Windy</option>
</select>
<select id="Select1" class="cd-select">
<option value="-1" selected>Choose a weather condition</option>
<option value="1" class="icon-sun">Sun</option>
<option value="2" class="icon-cloudy">Clouds</option>
<option value="3" class="icon-weather">Snow</option>
<option value="4" class="icon-rainy">Rain</option>
<option value="5" class="icon-windy">Windy</option>
</select>
<select id="Select2" class="cd-select">
<option value="-1" selected>Choose a weather condition</option>
<option value="1" class="icon-sun">Sun</option>
<option value="2" class="icon-cloudy">Clouds</option>
<option value="3" class="icon-weather">Snow</option>
<option value="4" class="icon-rainy">Rain</option>
<option value="5" class="icon-windy">Windy</option>
</select>
</div>
<input type="text" id="sum">
When any select with class 'cd-select' change the sum will be calculated and displayed on the text field
不會像您期望的那樣進行求和,因為每次觸發事件偵聽器時, total
變量都將重置為0
。 因此,如果將變量定義為全局變量,則代碼將起作用。
因此,您想要的是:
var total = 0;
$("#cd-dropdown").change(function() {
$.each($(".cd-select"), function() {
total += parseInt($(this).val());
});
$("#sum").val(total)
});
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