/Html/How to enable button after checked

How to enable button after checked

<input onclick="alert('thank you for agreeing to the terms and conditions')" type="submit" name="sendNewSms" class="inputButton" id="sendNewSms" value=" i agree to the terms and conditions " />

<input type="checkbox"  onchange="document.getElementById('sendNewSms').disabled = !this.checked;" />
<!--this will only work if u click the up arrow button on the right side-->

How to enable button after checked

<input type="submit" name="sendNewSms" class="inputButton" id="sendNewSms" value=" Send " />

<input type="checkbox"  onchange="document.getElementById('sendNewSms').disabled = !this.checked;" />

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