PHP在表單上提交後如何保持按鈕正確檢查

我正在構建一個計算器，我差不多完成了。在我的表單上，我在頂部有一個2單選按鈕，用於S.A.E單位或公制單位。PHP在表單上提交後如何保持按鈕正確檢查

當我點擊計算一切運行在計算器工作，但我檢查的單選按鈕回到沒有選中。如果有人點擊指標並點擊提交，我如何在結果之後檢查公制單選按鈕，SAE也一樣？

這裏是我的全部代碼：

<?php 
if (isset($_POST['units'])) $units = $_POST['units']; 
if (isset($_POST['dia'])) $dia = $_POST['dia']; 
if (isset($_POST['wt'])) $wt = $_POST['wt']; 
if (isset($_POST['L'])) $L = $_POST['L']; 
if (isset($_POST['num'])) $num = $_POST['num']; 
if (isset($_POST['waste'])) $waste = $_POST['waste']; 
if (isset($_POST['surface'])) $surface = $_POST['surface']; 
$denom = ($units == "US" ? 12 : 100); 
$coverage = ($units == "US" ? 1000 : 92.9); 
//$measurements = ($units == "US" ? "in" : "cm"); 
$measurements == $units; 
if($units == 'US') 
$measurements = 'in'; 
else if($units == 'Metric') 
$measurements = 'cm'; 
else 
$measurements = 'in or cm'; 
$length == $units; 
if($units == 'US') 
$length = 'feet'; 
else if($units == 'Metric') 
$length = 'meters'; 
else 
$length = 'feet or meters'; 
$answer1 = pi() * ($dia/$denom) * $L * $num * ($waste + 1)/$coverage; 
$answer2 = pi() * (($dia + ($wt * 2))/$denom) * $L * $num * ($waste + 1)/$coverage; 
//$answer = ($answer1 + $answer2); 
$answer = ($answer); 
if($surface == TRUE) 
$answer = ($surface * ($waste + 1)/$coverage); 
else 
$answer = ($answer1 + $answer2); 

echo <<<_END 
<form method='post' action=''> 
<table border='0' width='500px' cellpadding='2' cellspacing='1' class="table"> 
<tr class="calcheading"><td><label><input type="radio" name="units" value="US" />S.A.E.  </label> 
<label><input type="radio" name="units" value="Metric" />Metric</label> </td></tr> 
<tr class="calcheading"><td colspan="2"><strong>ConBlock MIC Circular Surface  Area</strong></td></tr> 
<tr class="calcrow"><td>Surface Area ($length):</td><td align="center"><input type='text' name='surface' value="$surface"/></td></tr> 
<tr class="calcrow"><td>Diameter ($measurements):</td><td align="center"><input type='text' name='dia' value="$dia"/></td></tr> 
<tr class="calcrow2"><td>Wall Thickness ($measurements):</td><td align="center"><input type='text' name='wt' value="$wt"/></td></tr> 
<tr class="calcrow"><td>Section Length ($length):</td><td align="center"><input type='text' name='L' value="$L"/></td></tr> 
<tr class="calcrow"><td>Number of Sections:</td><td align="center"><input type='text' name='num' value="$num"/></td></tr> 
<tr class="calcrow"><td>Waste Variance % (Please add in decimal form):</td><td  align="center"><input type='text' name='waste' value="$waste"/></td></tr> 
<tr class="submit"><td colspan="2"><input type='submit' value='Calculate'/></td></tr> 
_END; 
?> 

<tr class="calcrow"> 
<td><i>Gallons Needed for Interior Coating:</td> 
<td align="center"><input type="text" value="<?php echo round($answer1, 2)?>"></td></i> 
</tr> 
<tr class="calcrow"> 
<td><i>Gallons Needed for Exteror Coating:</td> 
<td align="center"><input type="text" value="<?php echo round($answer2, 2)?>"></td></i> 
</tr> 
<tr class="calcrow"> 
<td><i>Total Gallons of ConBlock MIC needed:</td> 
<td align="center"><input type="text" value="<?php echo round($answer, 2)?>"></td></i> 
</tr> 
</table> 
</form>

我已經找遍了一個答案，但我想我不太清楚，甚至在這件事上搜索。要明白我的意思這裏是網址：

http://www.launchrun.com/consealtest/ConBlockMIC-circular.php

由於任何人誰可以幫我擺脫對這個問題的一些光！

來源

2013-07-31 GrayGhost23

請考慮修復你的編碼風格，因爲你的代碼是一團糟。 –

<?php 
function selected($val = "") 
{ 
    $units = isset($_POST['units']) ? $_POST['units'] : null; 
    echo ($units == $val) ? "CHECKED='CHECKED'" : ""; 
} 
$units = isset($_POST['units']) ? $_POST['units'] : null; 

$dia = isset($_POST['dia']) ? $_POST['dia'] : null; 

$wt = isset($_POST['wt']) ? $_POST['wt'] : null; 

$L = isset($_POST['L']) ? $_POST['L'] : null; 

$num = isset($_POST['num']) ? $_POST['num'] : null; 

$waste = isset($_POST['waste']) ? $_POST['waste'] : null; 

$surface = isset($_POST['surface']) ? $_POST['surface'] : null; 

$denom = (($units == "US") ? 12 : 100); 

$coverage = (($units == "US") ? 1000 : 92.9); 


$measurements = 'in or cm'; 
if($units == 'US'){ 
    $measurements = 'in'; 
} 
if($units == 'Metric') 
{ 
    $measurements = 'cm'; 
} 




if($units == 'US') 
$length = 'feet'; 
else if($units == 'Metric') 
$length = 'meters'; 
else 
$length = 'feet or meters'; 

$answer1 = pi() * ($dia/$denom) * $L * $num * ($waste + 1)/$coverage; 
$answer2 = pi() * (($dia + ($wt * 2))/$denom) * $L * $num * ($waste + 1)/$coverage; 
$answer = ($answer1 + $answer2); 
$answer = ($answer); 
if($surface == TRUE) 
$answer = ($surface * ($waste + 1)/$coverage); 
else 
$answer = ($answer1 + $answer2); 

?> 
<form method='post' action=''> 
<table border='0' width='500px' cellpadding='2' cellspacing='1' class="table"> 
<tr class="calcheading"><td><label> 
<input type="radio" name="units" <?php selected("US")?> value="US" />S.A.E.</label> 
<label> 
<input type="radio" name="units" <?php selected("Metric")?> value="Metric" />Metric</label> </td></tr> 
<tr class="calcheading"><td colspan="2"><strong>ConBlock MIC Circular Surface  Area</strong></td></tr> 
<tr class="calcrow"><td>Surface Area (<?php echo $length ?>):</td><td align="center"><input type='text' name='surface' value="<?php echo $surface ?>"/></td></tr> 
<tr class="calcrow"><td>Diameter (<?php echo $measurements ?>):</td><td align="center"><input type='text' name='dia' value="<?php echo $dia ?>"/></td></tr> 
<tr class="calcrow2"><td>Wall Thickness ($measurements):</td><td align="center"><input type='text' name='wt' value="<?php echo $wt ?>"/></td></tr> 
<tr class="calcrow"><td>Section Length ($length):</td><td align="center"><input type='text' name='L' value="<?php echo $L ?>"/></td></tr> 
<tr class="calcrow"><td>Number of Sections:</td><td align="center"><input type='text' name='num' value="<?php echo $num ?>"/></td></tr> 
<tr class="calcrow"><td>Waste Variance % (Please add in decimal form):</td><td  align="center"><input type='text' name='waste' value="<?php echo $waste ?>"/></td></tr> 
<tr class="submit"><td colspan="2"><input type='submit' value='Calculate'/></td></tr> 
<tr class="calcrow"> 
<td><i>Gallons Needed for Interior Coating:</td> 
<td align="center"><input type="text" value="<?php echo round($answer1, 2)?>"></td></i> 
</tr> 
<tr class="calcrow"> 
<td><i>Gallons Needed for Exteror Coating:</td> 
<td align="center"><input type="text" value="<?php echo round($answer2, 2)?>"></td></i> 
</tr> 
<tr class="calcrow"> 
<td><i>Total Gallons of ConBlock MIC needed:</td> 
<td align="center"><input type="text" value="<?php echo round($answer, 2)?>"></td></i> 
</tr> 
</table> 
</form>

來源

2013-07-31 17:31:50 ROMMEL

ROMMEL，非常感謝你，完美的作品！我遲早會得到php的縈繞。我真的很感激！再次感謝。 – GrayGhost23

<input type="radio" name="units" <?php if (isset($_POST['units']) && $_POST['units'] == "Metric"){ print("checked=\"checked\""); } ?> value="Metric" />

來源

2013-07-31 16:55:58 lePunk

你可以這樣做：

<?php 

$units = null; 

if (!empty($_POST)) { 
    $units = $_POST['units']; 
} 

?> 

<input type="radio" name="units" value="Metric" <?php echo (($units == 'Metric') ? 'checked="checked"' : ''); ?> /> 
<input type="radio" name="units" value="US" <?php echo (($units == 'US') ? 'checked="checked"' : ''); ?> />

通過檢查units輸入的值，我們可以判斷，如果輸入要素checked屬性應該是存在與否。

來源

2013-07-31 17:03:18 Andy0708

PHP在表單上提交後如何保持按鈕正確檢查

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