如何将主题绑定到链接并注入表单

Question

This is what i want to achieve:

A link which has a subject in it. When clicking on the link, you are directed to a form which has already filled in the subject of the link.

<!-- here should the subject in, lets say: reference 1 --> 
<a href="form.html">Link with subject</a> 

The form:

<form action="">

<input name="subject" type="text" id="subject" /> <!-- the subject is already filled in from the link -->
<textarea name="message" id="" cols="30" rows="10"></textarea>
<input type="submit" value=Send" />

</form>

The link and form are NOT on the same page

Answer 1

Since it is tagged php why not use php for it?

<a href="form.html?subject=<?= urlencode('Your subject here') ?>">Link</a>

And in the form:

<form action="">
    <input name="subject" type="text" id="subject" value="<?= urldecode($_GET['subject']) ?>" />
</form>

Warning: This is not secure and you need to sanitize the subject variable first before showing it back to the user.