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Millimeter → Inches Converter
Inches: —
Tip: 1 inch = 25.4 mm
(function(){
const mmInput = document.getElementById(‘mm’);
const resultBox = document.getElementById(‘result’);
function mmToInches(mm){
// exact conversion factor: 1 in = 25.4 mm
return mm / 25.4;
}
function formatNumber(n){
if (isNaN(n) || !isFinite(n)) return ‘—’;
// show up to 4 decimal places, remove trailing zeros
return parseFloat(n.toFixed(4)).toString();
}
function calculate(){
const mm = parseFloat(mmInput.value);
if (isNaN(mm)) {
resultBox.textContent = ‘Inches: —’;
return;
}
const inches = mmToInches(mm);
resultBox.textContent = ‘Inches: ‘ + formatNumber(inches) + ‘ in’;
}
// Auto calculate on input
document.getElementById(‘mmForm’).addEventListener(‘input’, calculate);
// Send GA event on focus (if gtag available) — non-blocking
mmInput.addEventListener(‘focus’, function(){
try {
if (typeof gtag === ‘function’) {
gtag(‘event’, ‘mm_input_focus’, {
‘event_category’: ‘engagement’,
‘event_label’: ‘mm-to-inches’,
‘value’: 1
});
} else if (typeof ga === ‘function’) {
// legacy analytics (if used)
ga(‘send’, ‘event’, ‘engagement’, ‘mm_input_focus’, ‘mm-to-inches’);
}
} catch (e) {
// fail silently, keep widget lightweight
console && console.log && console.log(‘GA event skipped’, e);
}
});
// initial calc (in case placeholder has value from WP)
calculate();
})();
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