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37 lines
1.3 KiB
37 lines
1.3 KiB
let button = document.getElementById('btn');
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button.addEventListener('click', () => {
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const height = parseInt(document.getElementById('height').value);
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const weight = parseInt(document.getElementById('weight').value);
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const result = document.getElementById('output');
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let height_status=false, weight_status=false;
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if(height === '' || isNaN(height) || (height <= 0)){
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document.getElementById('height_error').innerHTML = 'Please provide a valid height';
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}else{
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document.getElementById('height_error').innerHTML = '';
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height_status=true;
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}
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if(weight === '' || isNaN(weight) || (weight <= 0)){
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document.getElementById('weight_error').innerHTML = 'Please provide a valid weight';
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}else{
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document.getElementById('weight_error').innerHTML = '';
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weight_status=true;
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}
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if(height_status && weight_status){
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const bmi = (weight / ((height*height)/10000)).toFixed(2);
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if(bmi < 18.6){
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result.innerHTML = 'Under weight : ' + bmi;
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}else if(bmi >= 18.6 && bmi < 24.9){
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result.innerHTML = 'Normal : ' + bmi;
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}else{
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result.innerHTML = 'Over weight : ' + bmi;
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}
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}else{
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alert('The form has errors');
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result.innerHTML = '';
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}
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}); |