javascript,html,event-handling , If checkbox checked, instantly alert
If checkbox checked, instantly alert
Question:
Tag: javascript,html,event-handling
So, my goal is this: if the checkbox is checked by the user, do something (let's say just an alert). Here's my code, that is not working:
function validate() {
if (document.getElementById('LetterNeed').checked) {
alert("checked");
} else {
alert("You didn't check it! Let me check it for you.");
}
}
<input type="checkbox" name="LetterNeed" id="LetterNeed">Not important</span>
Thanks for your help!
Answer:
Call the validate function on change of the checkbox state.
<input type="checkbox" name="LetterNeed" id="LetterNeed" onchange="return validate()">Not important</span>
// ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
OR
document.getElementById('LetterNeed').addEventListener('change', validate);
DEMO
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