I have this script
<script>
function calculaDiferenca(data_inicio, data_fim) {
var date1 = new Date(data_inicio);
var date2 = new Date(data_fim);
var timeDiff = Math.abs(date2.getTime() - date1.getTime());
var diffDays = Math.ceil(timeDiff / (1000 * 3600 * 24));
alert(diffDays + ' dias');
}
(function() {
var calcBtn = document.getElementById('calcular');
calcBtn.addEventListener('click', function(){
var data_inicio = document.getElementById('data_inicio').value;
var data_fim = document.getElementById('data_fim').value;
calculaDiferenca(data_inicio, data_fim);
});
})();
</script>
Can I change instead of clicking the button to calculate being when date1 and date2 are filled do the calculation?
var calcBtn = document.getElementById('calcular');
The answer from @Khalil is good. I just want to add something to make the process sequential.
Make the date2 field disabled. As:
<input type="date" id="data_fim" disabled/>
Then make it dependent on date1.
let first = document.getElementById('data_inicio');
let last = document.getElementById('data_fim');
first.addEventListener('change', (e) => {
last.disabled = false
calculaDiferenca(e.target.value, last.value)
})
last.addEventListener('change', (e) => {
calculaDiferenca(first.value, e.target.value)
})
You can listen for change event on the input fields and invoke the calculation function.
let first = document.getElementById('data_inicio');
let last = document.getElementById('data_fim');
first.addEventListener('change', (e) => {
calculaDiferenca(e.target.value, last.value)
})
last.addEventListener('change', (e) => {
calculaDiferenca(first.value, e.target.value)
})
And here is a working snippet:
function calculaDiferenca(ev) {
var date1 = new Date(ini.value);
var date2 = new Date(fim.value);
var timeDiff = Math.abs(date2.getTime() - date1.getTime());
var diffDays = Math.ceil(timeDiff/(1000*3600*24));
dif.textContent=diffDays+' dia'+(diffDays===1?'':'s');
}
const [ini,fim,dif] = "data_inicio,data_fim,dif".split(",").map(t=>document.getElementById(t));
[ini,fim].forEach(e=>e.addEventListener("input",calculaDiferenca));
<input type="date" id="data_inicio" placeholder="inicio">
<input type="date" id="data_fim" placeholder="fim"><br>
<p>Diferenca: <span id="dif"></span></p>