input hidden
<input id="" type="hidden" value="">if the page is opened so count and put it to the value of hidden input
<form>
<div>
<label for="title">Post title:</label>
<input type="text" id="title" name="title" value="My excellent blog post">
</div>
<div>
<label for="content">Post content:</label>
<textarea id="content" name="content" cols="60" rows="5">
This is the content of my excellent blog post. I hope you enjoy it!
</textarea>
</div>
<div>
<button type="submit">Update post</button>
</div>
<input type="hidden" id="postId" name="postId" value="34657">
</form>Copyright © 2021 Codeinu
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