HTML How to auto select a check box?

问题

I have the following HTML code:

<table border = 0 cellpadding=5 >

<tr>
<td><input type="checkbox" name="all_sizes" value="All">All<br></td>
<td><input type="checkbox" name="10mm" value="10mm">10mm<br></td>
<td><input type="checkbox" name="20mm" value="20mm">20mm<br></td>
<td><input type="checkbox" name="30mm" value="30mm">30mm<br></td>
<td><input type="checkbox" name="40mm" value="40mm">40mm<br></td>
</tr>
</table>

How would we go about selecting the first check box by default?

回答1:

Change this:

<td><input type="checkbox" name="all_sizes" value="All">All<br></td>

to this (add the keyword 'checked'):

<td><input type="checkbox" name="all_sizes" value="All" checked>All<br></td>

回答2:

Assuming that you've fetched your data from mysql using mysqli_query()

<td><input type="checkbox" name="all_sizes" value="All" <?php if($data['col_name'] == 'val') { echo 'checked'; }?>>Value</td>

来源：https://stackoverflow.com/questions/13427966/html-how-to-auto-select-a-check-box