x10Hosting Member
I have a review site and just added a preview button. I have a select element with a score rating from 1 to 100, and I was wondering how to set the value as the value that was selected when the preview button was pressed. Basically, how do I set the value from the previous page in a select statement? The value will be provided using the PHP $_POST['score'] method.
Last edited by sikuneh; 03-25-2012 at 05:33 AM.
x10 Spammer
To select an option in a select element by default, add the "selected" attribute to the option element, as per the various HTML specs. That's as precise as I can get using the information you've provided. When asking for help with code, include a minimal test case. Read my sig for more.
Do you mean select element? A select statement is something else entirely.Originally Posted by sikuneh
Be sure to read all pages linked in this post; they have further information that should prove useful. When asking for help, make sure you follow Jon Skeet's and Eric Raymond's guidelines for prompt, accurate responses. Please answer any questions I ask; they're not rhetorical (probably). Any posted code is intended as illustrative example, rather than a solution to your problem to be copied without alteration. Study it to learn how to write your own solution.Misson, not Mission.
x10Hosting Member
Within a select element, select the predetermined option. I can see how, although, assume I have a list as such:
If it was susceptible to change, based on the review score. How would I set the option that is referenced by the score gotten from the database.HTML Code:<select name="list"> <option value="1">1</option> <option value="2">2</option> <option value="3">3</option> </select>
Like if the score was 2, how would I set that in the above select element with PHP?
Maybe something like
PHP Code:<select name="list">
<?php
$list_length = 3;
// Right here would be a connection to the database to retrieve
// the stored value which would truly set $stored_score
$stored_score = 2;
for ($i = 0; $i < $list_length; $i++) {
if ($i == $stored_score) {
echo "<option value='{$i}' selected>{$i}</option>";
}
else {
echo "<option value='{$i}'>{$i}</option>";
}
}
?>
</select>
x10Hosting Member
That should work. I've used code like that before.
x10 Spammer
As Adam points out, it should work, though your starting index is wrong if you want to start at 1. Did you try it?
However, it duplicates code by printing an <output> element in more than one place. You can avoid this by setting a variable to hold optional attributes.
(Note: if the value of an option element is to be the same as its content, you can leave off the value attribute. The value for an option element defaults to its text content.)PHP Code:<select>
<?php for ($i=1; $i < $list_length; ++$i) {
if ($i === $selected) {
$attrs = 'selected';
} else {
$attrs = '';
}
?>
<option <?php echo $attrs ?>><?php echo $i ?></option>
<?php } ?>
</select>
To avoid having to check for the selected option each time through the loop, assemble the document first, then set the selected option outside the loop. For example, you can do this with SimpleXML:
or with DOM:PHP Code:$doc = new SimpleXMLElement('<html />');
$select = $doc->addChild('select');
for ($i = 1; $i < $list_length; ++$i) {
$option = $select->addChild('option', $i);
}
$select->option[$selected-1]->addAttribute('selected','selected');
echo $select->asXML();
There isn't much of a gain for any approach, so use whatever you wish. One potential advantage of the XML parsers (SimpleXML and DOM) is that you can define the structure for data in one place (DRY, again) and process it for whatever purposes you need, such as creating forms or displaying data. It becomes very useful in an MVC architecture, as you can build up the document (or parts of the document), with different modules making changes as necessary until processing has finished.PHP Code:$doc = new DOMDocument();
$select = $doc->createElement('select');
for ($i = 1; $i < $list_length; ++$i) {
$option = $doc->createElement('option', $i);
$select->appendChild($option);
}
$select->childNodes->item($selected-1)->setAttribute('selected', TRUE);
$doc->appendChild($select);
echo $doc->saveHTML();
Be sure to read all pages linked in this post; they have further information that should prove useful. When asking for help, make sure you follow Jon Skeet's and Eric Raymond's guidelines for prompt, accurate responses. Please answer any questions I ask; they're not rhetorical (probably). Any posted code is intended as illustrative example, rather than a solution to your problem to be copied without alteration. Study it to learn how to write your own solution.Misson, not Mission.
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