Introduction to html5 forms, select drop-down, and textarea multi-line text

There are many

attributes under the drop-down

##name In fact, if there is a name, then there is a value, because the button is submitted in the format of name=value. If you do not write the value, what is submitted will be the

string# of the option.

## is actually similar to the

list

of input, both require option and value can be omitted, but assignment is generally used for database storage and Call. The database is more efficient for numeric index

##size No need to pull down, it seems Taobao sellers select the same product category list...

optgroup This is not an attribute, it is just a node with multiple layers of options. There are many tags used to divide nodes in this way. For example, hgroup is used to organize titles, and

optgroup is used to organize data classification. Of course, this is only for performance, and the actual classification is still in the database.

三三Group

, this is the combined force of optgroup and label.

multiple Multiple selection After it is true, you can press ctrl to select multiple lines

, and the necessary condition is still within the <form> double box. </p> <p><span style="font-size: 16pt"></span>Because it is not within the form double box, the button cannot submit the name and value. Of course, sometimes it will fail, close it and try again. Open the page or refresh it with ctrl+F5. </p> <p style="margin-left: 36pt"><span style="font-size: 16pt"> </span></p> <p></p>##rows cols wrap is a textarea-specific setting<p><img src="https://img.php.cn/upload/article/000/001/506/29eb9dd654e8db0464759bf438c1fa6e-9.png" alt=""> </p> <p> </p><p>The above is the detailed content of Introduction to html5 forms, select drop-down, and textarea multi-line text. For more information, please follow other related articles on the PHP Chinese website!</p></div><div class="nphpQianMsg"><div class="clear"></div></div><div class="nphpQianSheng"><span>Statement：</span><div>The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. 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