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Easiest way to alternate row colors in PHP/HTML?

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無奈伤痛
無奈伤痛 2020-12-01 03:41

Here\'s a PHP example of mine. Can anyone find a shorter/easier way to do this?


    


        

                      

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19条回答
  • 梦如初夏
    2020-12-01 04:11

    You can encapsulate the logic as follows:

    <?php

class ListCycler {
    private $cols, $offs, $len;

    // expects two or more string parameters
    public function __construct() {
        $this->offs = -1;
        $this->len = func_num_args();
        $this->cols = func_get_args();

        foreach($this->cols as &$c)
            $c = trim(strval($c));
    }

    // the object auto-increments every time it is read
    public function __toString() {
        $this->offs = ($this->offs+1) % $this->len;
        return $this->cols[ $this->offs ];
    }
}
?>
<html>
<head>
  <style>
    ul#posts li.odd { background-color:red; }
    ul#posts li.even { background-color:white; }
  </style>
</head>
<body>
  <div>
    <h3>Posts:</h3>
    <ul id="posts"><?php
        $rc = new ListCycler('odd','even');
        foreach($posts as $p)
            echo "<li class='$rc'>$p</li>";
    ?></ul>
  </div>
</body>
</html>
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  • 醉梦人生
    2020-12-01 04:14 
    <?php $alt = true; foreach ($posts as $post): $alt = !$alt; ?>
<div<?php echo $alt ? ' class="odd"' : ''; ?>>
    <!-- Content --> 
</div>  
<?php endforeach ?>

    Would be the simplest and clearest way to do it.

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  • 小蘑菇
    2020-12-01 04:14

    On a side noe, to alternate between two values a and b, a nice way of doing it in a loop is this:

    x = a;
while ( true ) {
    x = a + b - x;
}

    You can also do this without addition and subtraction:

    x = a ^ b ^ x;

    where ^ is the XOR operation.

    If you just want to alternate between 0 and 1, you can do this:

    x = 0;
while ( true ) {
    x = !x;
}

    You could of course use x as an index of colors, CSS style classes and so on.

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  • 时光说笑
    2020-12-01 04:17

    Fundamentally - no. That's about as easy as it gets. You might rewrite it a bit shorter/cleaner, but the idea will be the same. This is how I would write it:

    $c = true; // Let's not forget to initialize our variables, shall we?
foreach($posts as $post)
    echo '<div'.(($c = !$c)?' class="odd"':'').">$post</div>";
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  • 有刺的猬
    2020-12-01 04:18 
    function row_color($cnt,$even,$odd) { 
echo ($cnt%2) ? "<tr bgcolor=\"$odd\">" : "<tr bgcolor=\"$even\">"; 
}

    How to use:

    $cnt=0;
while ($row = mysql_fetch_array ($result)) {
row_color($cnt++,"e0e0e0","FFFFFF");
}
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  • 梦如初夏
    2020-12-01 04:19

    Been using something like this:

    <?php
function cycle(&$arr) {
    $arr[] = array_shift($arr);
    return end($arr); 
}

$oddEven = array('odd', 'even');
echo cycle($oddEven)."\n";
echo cycle($oddEven)."\n";
echo cycle($oddEven)."\n";
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