CODEWITHSUNDEEP
php
Erik Fischer
Erik Fischer

Reputation: 1481

Adding attributes to HTML tags with PHP

What I'm trying to do is change

<input name="username">

to something like

<input name="username" class="empty">

if the form is empty.

Here's the PHP I've got for it in a separate file:

$username = $_POST['username'];

if(empty($username)) {
  // add HTML attribute to tag
}

How would I do this?

Upvotes: 0

Views: 1221

Answers (4)

kaizenCoder
kaizenCoder

Reputation: 2229

<?php
if(isset($_POST['save_btn'])) {
 $class = 'class="empty"';
}
?>

<form method="post" action="#">
    <input name="username" <?php if (!empty( $class )){echo $class ;} ?> >
    <input type="submit" name="save_btn" value="save">
</form>

Upvotes: 1

Charaf JRA
Charaf JRA

Reputation: 8334

Here is the solution that i suggest: After submiting the form ,in action.php you will check if username is empty,if it's empty , you will redirect to index.php page with a variable in the url that indicates if field is empty or not(you can also use sessions).

index.php page : 

    <?php 

        if (isset($_GET['empty'] )){$empty="class='empty'";}
        else {
              $empty="";
             }

     ?>

    <form method="post" action="action.php">
    <input name="username" <?php echo $empty; ?> />
    <input type="submit" name="submit" value="save" />
    </form>

Your action.php page:

    <?php
     $username = $_POST['username'];

     if(empty($username)) {
        header('location:index.php?empty=1');
     }
    ?>

Upvotes: 1

Harm Wellink
Harm Wellink

Reputation: 226

Is this in a form that sends to itself? Then try to use the PHP directly in the HTML like this

<input name="username" class=" <?=(empty($_POST['username'])?"empty":"";?> " />

by using a shortened if-statement the script checks for an empty username field and then outputs the string "empty" in the classes attribute.

Offtopic: use trim() to check if the field is really empty, and remove whitespace.

Upvotes: 0

AbsoluteƵER&#216;
AbsoluteƵER&#216;

Reputation: 7880

You can use echo if the form doesn't already exist.

<?php

$username = $_POST['username'];

if(empty($username)) {
  // add HTML attribute to tag
  echo "<input name=\"username\" class=\"empty\">";
} else {
  echo "<input name=\"username\">";
}

?>

Upvotes: 0

Related Questions