How to keep already-set GET parameter values on form submission?
I have a URL : foo.php?name=adam&lName=scott, and in foo.php I have a form which gives me values of rectangleLength & rectangleBreadth with a submit button.
When I click this submit button with form action as $_SERVER['REQUEST_URI'], I get this result URL: foo.php?rectangleLength=10开发者_如何学编程&rectangleBreadth=5 (these values have been filled in by the user).
Notice that I am losing my previous values name & lName from the URL.
How can I keep them?
Also, keep in mind that I have to come back to foo.php and if the user wants to submit the form again then the length and breadth values should change.
You can add two hidden fields in the form on the first target site, blabla.php in your case:
<form ...>
<input type="hidden" name="name" value="<?php echo htmlspecialchars($_GET['name']);?>">
<input type="hidden" name="lName" value="<?php echo htmlspecialchars($_GET['lName']);?>">
<!-- rest of the form here -->
</form>
For a dynamic solution, use a foreach loop:
<?php
foreach($_GET as $name => $value) {
$name = htmlspecialchars($name);
$value = htmlspecialchars($value);
echo '<input type="hidden" name="'. $name .'" value="'. $value .'">';
}
?>
You may consider locking the dynamic approach down to a list of known possible keys:
<?php
$keys = array('name', 'lName', ...);
foreach($keys as $name) {
if(!isset($_GET[$name])) {
continue;
}
$value = htmlspecialchars($_GET[$name]);
$name = htmlspecialchars($name);
echo '<input type="hidden" name="'. $name .'" value="'. $value .'">';
}
?>
A simpler solution to keep the URL unchanged by using http_build_query
<form action="<?php echo $_SERVER["PHP_SELF"] . '?'.http_build_query($_GET); ?>" ...
..
..
There are different ways to do this. All of them write the parameters they receive into a file, memory, or a database and retrieve them later with a key
The easiest method is something like a session variable: http://php.net/manual/en/features.sessions.php
The main setup is something like this (caution: that is unsecure code, make sure you only add session variables you want to keep, and sanitize user input!):
<?php
session_start();
foreach ($_GET as $key=>$value) {
$_SESSION[$key]=>$value;
}
?>
and now, as long as the user does not close the browser, you can access these variables with $_SESSION[varname];
Once, I needed sorting the results in a table keeping the search results coming from GET. I did like that:
unset($_GET['sort']); // sort param is removed, otherwise there will be created many sort params
$url = http_build_query($_GET);
echo "<a href='?".$url."&sort=title'>Title</a>";
echo "<a href='?".$url."&sort=author'>Author</a>";
To handle query with arrays:
foreach (explode("\n", http_build_query($query, '', "\n")) as $keyValue) {
[$key, $value] = explode('=', $keyValue, 2);
$key = htmlspecialchars(urldecode($key), ENT_COMPAT | ENT_HTML5);
$value = htmlspecialchars(urldecode($value), ENT_COMPAT | ENT_HTML5);
echo '<input type="hidden" name="' . $key . '" value="' . $value . '"' . "/>\n";
}
Following code works for my project. Hope it help some. 1. In menu (calling html) I call VendorSearch.php. variable fromvs is used in URL. 2. The target php VendorSearch.php will do different jobs based on the value of $_GET['fromvs'] 3. In VendorSearch.php, aftersession_start(),
$srchfor ="";
$fromwhat = $_GET['fromvs'];
$_SESSION['fromwhat'] = $fromwhat;
//save value to $VS
$vs = $fromwhat;
3. Use hidden input to store URL passed variable
<div style='position: absolute; top: 10px; left: 400px;'><input type='hidden' hidden='hidden' id='fromvs' name='fromvs' value="<?php echo $_SESSION['fromwhat']; ?>"></div>
4. But this thie field's value may lost after clicking button "srchvnd". So use a function to reset
$_SESSION['fromwhat'];
if (isset($_POST['srchvnd']))
{
$vs = $_POST['fromvs'];
somefunction($vs);
}
-----------------Source code----------------------
Segment in Calling html
....
<body>
<div style=" position: absolute; top: 1px; left: 5px; height:740px; width:205px; border-radius: 10px;" >
<!-- Start css3menu.com BODY section -->
<ul id="css3menu1" class="topmenu">
<li class="topfirst"><a href="VendorSearch.php?fromvs=V" target="I1" style="width:183px;">Add a Subcontractor </a></li>
....
<li class="topmenu"><a href="VendorSearch.php?fromvs=S" target="I1" style="width:183px;">Assign Subcontractor Contracts</a></li>
.....
<li class="toplast"><a href="login.php" target="_self" style="width:183px;">Log Out</a></li>
</ul>
....
</div>
Segment in target php: VendorSearch.php
<?php
//VendorSearch.php
//http://mted202.mtaent.org:9051/ocr/login.php rweinbau
require_once('dbinfo.php');
session_start();
$c = oci_pconnect("ocr","ocrmta","HQT4");
oci_set_client_identifier($c, $_SESSION['username']);
$username = htmlentities($_SESSION['username'], ENT_QUOTES);
.....
$srchfor ="";
$fromwhat = $_GET['fromvs'];
$_SESSION['fromwhat'] = $fromwhat;
$vs = $fromwhat;
if (isset($_POST['srchvnd']))
{
$vs = $_POST['fromvs'];
somefunction($vs);
}
else
{
;
}
?>
<body>
<form class="vfrmsrch" name="vndsearch" id="vndsearch" action="VendorSearch.php?fromvs='<?php echo $fromwhat; ?>'" method="POST">
<div style='position: absolute; top: 10px; left: 400px;'><input type='hidden' hidden='hidden' id='fromvs' name='fromvs' value="<?php echo $_SESSION['fromwhat']; ?>"></div>
......
<td><input type="submit" class="slbt" name="srchvnd" id ="srchvnd" vaue="Search"></input></td>
......
</form>
.......
</body>
</html>
<?php
function somefunction($vvs){
//$msg = "We are inf somefunction() function </a></div><br>";
// echo "<div style='position: absolute; top: 100px; left: 10px;'><a style='color:blue'>".$msg;
$_SESSION['fromwhat'] = $vvs;
............
oci_close($c);
}
- In menu (calling html) I call VendorSearch.php. variable fromvs is used in URL.
- The target php VendorSearch.php will do different jobs based on the value of
$_GET['fromvs'] In VendorSearch.php, aftersession_start(),
$srchfor =""; $fromwhat = $_GET['fromvs']; $_SESSION['fromwhat'] = $fromwhat; $vs = $fromwhat;Use hidden input to store URL passed variable
<div style='position: absolute; top: 10px; left: 400px;'><input type='hidden' hidden='hidden' id='fromvs' name='fromvs' value="<?php echo $_SESSION['fromwhat']; ?>"></div>But this thie
Segment in Calling html .... Add a Subcontractor .... Assign Subcontractor Contracts ..... Log Out ....
Segment in target php: VendorSearch.php
<?php
//VendorSearch.php
//http://mted202.mtaent.org:9051/ocr/login.php rweinbau
require_once('dbinfo.php');
session_start();
$c = oci_pconnect("ocr","ocrmta","HQT4");
oci_set_client_identifier($c, $_SESSION['username']);
$username = htmlentities($_SESSION['username'], ENT_QUOTES);
.....
$srchfor ="";
$fromwhat = $_GET['fromvs'];
$_SESSION['fromwhat'] = $fromwhat;
$vs = $fromwhat;
if (isset($_POST['srchvnd']))
{
$vs = $_POST['fromvs'];
somefunction($vs);
}
else
{
;
}
?>
<body>
<form class="vfrmsrch" name="vndsearch" id="vndsearch" action="VendorSearch.php?fromvs='<?php echo $fromwhat; ?>'" method="POST">
<div style='position: absolute; top: 10px; left: 400px;'><input type='hidden' hidden='hidden' id='fromvs' name='fromvs' value="<?php echo $_SESSION['fromwhat']; ?>"></div>
......
</form>
.......
</body>
</html>
<?php
function somefunction($vvs){
//$msg = "We are inf somefunction() function </a></div><br>";
// echo "<div style='position: absolute; top: 100px; left: 10px;'><a style='color:blue'>".$msg;
$_SESSION['fromwhat'] = $vvs;
............
oci_close($c);
}
My personal preference would be to specify the keys you wish to accept and be sure to run the value through htmlspecialchars().
$url_params = array(
'tab'
);
foreach( $url_params as $key ) {
echo !empty( $_GET[$key] ) ? '<input type="hidden" name="'. $key .'" value="'. htmlspecialchars( $_GET[$key] ) .'" />' : '';
}
加载中,请稍侯......
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