How To Set A Default Value Based On User's Previous Value
I want to have a default value based on what the user put before. For example, if in an input I put '5' I want to see that the value of that input is 5 when I refresh the page, but
Solution 1:
Use local storage:
localStorage = window.localStorage;
localStorage.setItem('inputDefault', '5');
let inputDefault = localStorage.getItem('inputDefault');
Here's a more practical example I quickly whipped up:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Local Storage Example</title>
<script type="text/javascript">
function setLocalStorageValue()
{
let myNumberInputField = document.getElementById('myNumberInput');
let myNewValue = myNumberInputField.value;
let localStorage = window.localStorage;
localStorage.setItem('defaultValue', myNewValue);
}
function getLocalStoredValue()
{
let localStorage = window.localStorage;
let defaultValue = localStorage.getItem('defaultValue');
let myNumberInputField = document.getElementById('myNumberInput');
myNumberInputField.value = defaultValue;
}
</script>
</head>
<body onload="getLocalStoredValue()">
<label>My Number Input
<input type="number" id="myNumberInput" value="0" onchange="setLocalStorageValue()">
</label>
</body>
</html>
Does this answer your question? Note how I am writing back to local storage on the onchange event of the input in question, and I read from local storage when the body of the html loads.
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