【发布时间】：2021-08-30 08:52:04
【问题描述】：
我试图仅在字段为空白时限制计算。我有许多其他字段同时计算，我想将计算限制为仅未填写的字段。
我对JS不是很了解，所以希望能在这里得到帮助……谢谢大家的回答，我在下面留下更多信息。
基本上一切正常。但是，当 bodyfat 字段为空时，将执行 BMR 和 TDEE Katch McArdle 和 Cunningham 公式的计算。
我要做的是仅在 Bodyfat 字段包含值时计算 McArdle 和 Cunningham 公式字段。
calculate = function()
{
var weight = document.getElementById('weight').value;
var height = document.getElementById('height').value;
var age = document.getElementById('age').value;
var bodyfat = document.getElementById('bodyfat').value / 100;
var select_lvl = document.querySelector('#a_level option:checked').value;
//Sex Selection Hide-Show Div//
var sex = document.querySelector('input[name="radios"]:checked').value;
document.getElementById('bmr-sexuomo').hidden = sex !== 'Male';
document.getElementById('bmr-sexdonna').hidden = sex !== 'Female';
document.getElementById('MifflinMale').hidden = sex !== 'Male';
document.getElementById('MifflinFemale').hidden = sex !== 'Female';
var bmr_mifflin_man = (10*weight) + (6.25*height) - (5*age) + 5;
document.getElementById('bmr_mifflin_man').value = bmr_mifflin_man.toLocaleString('it-IT', {maximumFractionDigits: 0}) + " Kcal";
var tdee_mifflin_man = (bmr_mifflin_man*select_lvl);
document.getElementById('tdee_mifflin_man').value = tdee_mifflin_man.toLocaleString('it-IT', {maximumFractionDigits: 0}) + " Kcal";
var bmr_mifflin_woman = (10*weight) + (6.25*height) - (5*age) - 161;
document.getElementById('bmr_mifflin_woman').value = bmr_mifflin_woman.toLocaleString('it-IT', {maximumFractionDigits: 0}) + " Kcal";
var tdee_mifflin_woman = (bmr_mifflin_woman*select_lvl);
document.getElementById('tdee_mifflin_woman').value = tdee_mifflin_woman.toLocaleString('it-IT', {maximumFractionDigits: 0}) + " Kcal";
//Result BMR Katch Mc Ardle Formula
var bmr_katch = (370 + ( 21.6 * ( weight * ( 1 - bodyfat ))));
document.getElementById('bmr_katch').value = bmr_katch.toLocaleString('it-IT', {maximumFractionDigits: 0}) + " Kcal";
//Result TDEE Katch Mc Ardle Formula
var tdee_katch = (bmr_katch*select_lvl);
document.getElementById('tdee_katch').value = bmr_katch.toLocaleString('it-IT', {maximumFractionDigits: 0}) + " Kcal";
//Result BMR Cunningham Formula
var bmr_cunningham = (500 + ( 22 * ( weight * ( 1 - bodyfat ))));
document.getElementById('bmr_cunningham').value = bmr_cunningham.toLocaleString('it-IT', {maximumFractionDigits: 0}) + " Kcal";
//Result TDEE Cunningham Formula
var tdee_cunningham = (bmr_cunningham*select_lvl);
document.getElementById('tdee_cunningham').value = bmr_cunningham.toLocaleString('it-IT', {maximumFractionDigits: 0}) + " Kcal";
//This is Activity Level Radio Selection//
var leggeros = document.getElementById('leggeros').value * 1.2;
var attivos = document.getElementById('attivos').value * 1.375;
var allenatos = document.getElementById('allenatos').value * 1.55;
var Mattivos = document.getElementById('Mattivos').value * 1.75;
var Eattivos = document.getElementById('Eattivos').value * 1.9;
}
//Reset Function
function resetFields() {
document.getElementById("bmrcalc").reset();
document.getElementById('bmr_katch').value = ''
document.getElementById('bmr_mifflin_man').value = ''
var ele = document.getElementsByName("radiosa");
for(var i=0;i<ele.length;i++)
ele[i].checked = false;
}
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标签： javascript html jquery conditional-statements calculator