I have a textbox where the value is depends on the input type into it.
<input name="convertedcurrency" id="convertedcurrency" type="text" required="required"/>
Is there any possibility that using any PHP code to display the value of the typed value instantly? (I was trying to echo the value using php at another textbox.)
P/S: It must be a php code due to I need this value to combine with other php value for other use.
There is nothing to do with php. You input is rendered and proceeded clientside (in the browser), so all manipulations should be done there too.
You should pass all the values and logic to the clientside, usually JavaScript, maybe with some sort of framework, jQuery, Angular.js, Ember.js, etc. Do manipulations there, and if you need to save something on the serverside, for example in the database - only then pass the data back using AJAX, and then you will need serverside processing with php, pyton, node.js, etc. Whatever is ok for you.
Related
Can we somehow pass the type HTML input attribute value to the $_POST array or grab it anyhow else with PHP?
I am aware that I can create a hidden field and basically put the type of the real input into the value of the hidden field, but this seems a bit like "repeating" work to me.
I want to create a Form, where input values are submitted to the $_POST and I can detect the type of that input without the need to hardcode/map the single inputs to each a type.
In this way I could detect the field type and act upon without the need to create a "map" that maps my custom inputs (by name or ID) to a certain type, which I already declare in HTML form anyway.
It seems a real shortcoming that the type of an input is undetectable in a Form Submit - or perhaps (hopefully) I miss something?
Can we somehow pass the type HTML input attribute value to the $_POST array or grab it anyhow else with PHP?
Not per se.
I am aware that I can create a hidden field and basically put the type of the real input into the value of the hidden field
That is a way to do it.
It seems a real shortcoming that the type of an input is undetectable in a Form Submit
Usually you know what type of data you expect for a given field because you aren't processing them generically, so it would rarely be a useful feature.
perhaps (hopefully) I miss something?
No.
Well here is the breakdown;
GET accessed via $_GET in PHP tackling and POST accessed via $_POST in PHP are transport methods, so is PUT, and DELETE etc for a from it does not matter what method you use it only works on client side and only knows to map every thing in it into serialised query string or at least have it read for being serialised.
For example
<input type="text" id="firstname" name="fname">
it takes the name attribute and converts into this
?fname=ferret
See it didn't even bother with ID attribute. When we hit submit button form will only run through name attributes of each input and make LHS of the with value and add user input as RHS to the value. It will not do anything else at all.
On PHP side we ask $_GET tunnel are there any query strings in the request or $_POST tunnel. Each of these if there is any query string - emphasis on word string. explodes the string into array and gives it you. hence $POST['fname'].
Looks something like this
$_POST = [
fname => 'ferret',
someothingelse => 'someothervalue']
SO what you are trying to do is or at least asking to do is ...make browser change its BOM behaviour - which we cannot in real sense of the matter; to make form add some thing like this.
?fname=ferret,text
?fname=ferret-text
?fname=ferret/text
form by default will not do this, unless you run custom function updating each query before submit and that is pron to what we call escaping, 3/100 time you would miss it given the chance
Then on PHP side you want PHP to figure out on its own that after slash is type like so
$_POST = [
fname => 'ferret/text']
PHP would not do that on its own, unless you fork it make custom whatever like Facebook has done and then run it or at least make some kind of low level library but that too would be after the fact.
in case your not wondering, thats how XSS and injections happen.
SO query string standards are rigid to keep things a string with militaristic data and serialised.
So yes what you intended to do with hidden field is one tested way of achieving what you are want.
Is it possible to send the result of a Python script to the input field of a PHP page?
I am using a PYTHON script to capture weight data from a scale. I would like to use that data from the python script, placing it into the input field of a PHP page.
The name of the input field on the page will remain static, as will the name of the page.
To initiate the process (from python script to the input field) I would use an on click command or something similar.
I am very new to python and very much appreciate any help.
Bob
You have to expose the data to the Internet - either create an upload script in PHP that will receive data whenever your Python script captures the new weight (you probably don't want this approach), or write a PHP script that will execute the Python script, take its output and send it back to you. You can then reload the whole page or use JavaScript to update the input field
Hope this helps you, comment if you have any questions
I guess this is what you're looking for
https://stackoverflow.com/a/5986282/7950984 .
Or you could create a server(running your php script) and post data to it, which will use your data as input. For this you could use CodeIgniter or a simplified REST Library RestServer.
What I'm trying to achieve is, if there is an non empty input + another input will show up.
This is how the input looks like.
<input type="file" name="image[]" />
What I'm trying to do is something like this
if (!empty($input)){
//Add another input
}
I think that you can get the idea, I am just wondering is this achievable, since I am new in php I don't know if this is possible.
And I'm sorry if I made any grammatical mistakes English is not my native language.
Sure! By looking at $_POST and $_FILES you can get an idea whether the input contained something or not. Then you can make that if and render an additional <input> as necessary.
Note though that PHP is server side code. It runs when the form is submitted in the browser and thus the browser makes a request to the server. If you want the additional input to appear immediately, as soon as the first input is filled, you'll need to use JavaScript. That's also quite possible.
My guess is, you want interactivity. In which case, you will need to use JavaScript, which is a client side language.
You hook an event to the input, and check each time it's changed to see if it's empty. If it is, you display another input.
You can see if the file was empty by using:
if ($_FILES['image']['size'] > 0)
Everytime I create a website for a client, I write the form HTML and then write the php script to handle that data. Sometimes the forms are long, sometimes there are multiple forms - it can get messy.
Before I begin to try and write my dynamic php form handler I'd really like some best practice advice and tips.
I thought of gathering all of the posted variables into an array to handle them. But then how do I know which values were supposed to be required or what they mean?
Maybe something already exists to fix this problem!
Thanks a lot,
Henry
Just a bit more info, what I have in mind is a php script which is flexible enough to work with any form built for it with any amount of inputs. I guess I see it as one file that sits on the server and multiple forms will be sending Ajax requests to it, which it can then satisfy
I don't think you should go with arrays, since the $_POST is already an array anyway.
But what about some sort of naming convention in your code?
ex:
<input type="text" name="txt_username" /> //prefix txt or whatever seems fitting.
Then use regular expressions to find what type of data you expect and act accordingly. You could for example write a class that handles different sorts of input and depending on the prefix in the name-property pass the data to the correct function.
Change the name of you submit button according to your form name. Then in php use a conditional statement to determine which form is posted and get your php working aas you wanted for different forms.
something like this
<input type="submit" name="signupform"/>
in php
if(isset($_POST['signupform']))
{
//Do this
}
elseif(isset($_POST['loginform']))
{
//do this
}
known issue:
You will need to keep those submit names unique and there should not be any other for element in any form being posted to that php file.
You can also add a hidden field
<input type="hidden" name='action' value='signup'/>
and then use a switch case with $_POST['action'] key.
I find it helps to seperate form parts by assigning them to an array e.g.
<input type="text" name="Users[username]" id="Users_username" />
That way, I can easily pick out sections by accessing the array key in php e.g.
$_POST['Users']; // returns username from above example
Is there a php equivalent to something like this jquery:
var allInputs = $(":input"); allInputs.attr('type');
I need to retrieve the types from each of the post variables sent to a php script but I want to do it without using javascript and/or jquery, I guess it would also be nice to get the other attributes as well (id, class etc). Perhaps I have missed something but I have tried to find the answer to this on the internet in search engines etc and can't even find another question similar to this one!
Thanks for any help and advice.
There is no way to do this without passing the types from jquery or javascript. All php knows is that some strings are coming in.
You can do something like this:
$.post('blah.php',{
var1: 'test',
var1Type: 'text'
...
});
You're pretty confused, PHP is a server side language, any value in the $_POST array is just a value (precisely a string). PHP doesn't have any idea of the input type, it's just an HTTP request with some data in its body.
To be clearer, this is what your webserver sees when you're doing a post request:
Name=Jonathan+Doe&Age=23&Formula=a+%2B+b+%3D%3D+13%25%21
PHP module reinterpret that input as key-values pairs, nothing more.
Everything is sent as a string. You have to know what are you using for and what types sent variables are and validate user input data.