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Creating a new subject form

From: PHP with MySQL Essential Training

Video: Creating a new subject form

In this movie we're going to work on Creating a New Subject in the admin area. That's the first part of our CRUD, the C for Create. We're going to do that by creating a web form, that will then submit to another page for processing the form and actually doing the submission. It's a two part process. The first page is going to be, new underscore subject dot php, that's where the web form will live, and it will submit to create underscore subject dot php. That's where we'll do the form processing. We'll look at the form processing in just a moment.

Creating a new subject form

In this movie we're going to work on Creating a New Subject in the admin area. That's the first part of our CRUD, the C for Create. We're going to do that by creating a web form, that will then submit to another page for processing the form and actually doing the submission. It's a two part process. The first page is going to be, new underscore subject dot php, that's where the web form will live, and it will submit to create underscore subject dot php. That's where we'll do the form processing. We'll look at the form processing in just a moment.

Let's start by looking at that New Subject Form. So I'm going to open up managedcontent.php, and I'm going to just make a New file here in TextMate. And I'm going to Copy everything that we had for manage_content over to this new file because that's going to be our starting place. Let's go ahead and just save that, Save As and it's going to be inside widget_corp, inside public and then we want to call it new_subject.php. Now we're going to want our database connection we're going to want all our functions.

We're going to want our header. We're even going to want to have find selected page because we're still going to have the navigation over on the left side throughout this process. If we didn't want the navigation there we could leave that off. And then of course we'll want our navigation here and then everything that's below this, we'll just strip out. So this is now where my form is going to live. I'll just Paste in some HTML for that. You can pause the movie if you want to copy it down. What I've got is an h2 tag at the beginning that says Create Subject. Here's my form, it's action is to submit to create_subject.php. It's going to be a post request, that's typical for forms. And then I've got my fields, Subject name, which actually now that I think about it, I'm going to just call Menu name, and then here's the text field for it.

There's no value for it, it's a new subject. We don't need a value there. And I've got position so this I got a little bit of a placeholder. It's going to be a select option, so for the option right now my only option is one. We'll come back to talk about that in a moment. And then visible, that's going to be some radio buttons, either No or Yes, and those will submit 0 for No or 1 for Yes. That's for correspondence to a Boolean, false or true. And then a button at the bottom that will submit, called Subject. And then I've also got down here below the end of the form, manage_content.php as a link with cancel, so that will just take me back to the other page. Let me just Save that.

Let's go over to managecontent.php real quick, and right after the navigation, I'm going to put br tag and then let's add a link here to our new page, href equals. And then we're going to call this new_subject.php, Add a subject. Then I'm actually put a plus in it as well, just so that it's really distinct from the rest of the navigation items. Alright, so let's close that up, and lets just go to Firefox and take a look. Let's reload the page.

Add a subject now is down here at the bottom, click on that. And we're on our subject page, new_subject.php, click cancel. We're back to this page, right? So, add a subject is only on the other page. It's not, it doesn't exist here because we're already on it, we don't need to, to have it listed here, alright? Now, let's take a look at this position. Right now, if we click on position, you'll see that there's only one option here. What we need is to use a little bit of php. Because we need to have more than one position. And the number of positions is going to vary.

Right now we have four subjects, About Widget Corp, Products, Services, and Today's Widget Trivia, those are four things. So if we're creating a new one, this could potentially be position number five. If we go to create another new one again, it could be position number six, right? So we need it to increment as we add new subjects to it, or if we delete subjects We want it to go back down in decrement. It matters how many subjects we have. So to do that, we just write a loop, and we can do that PHP, we know how to write loops. Lets create ourselves a little block of PHP here.

And I'm going to do a for loop. So for count equals one to start with and then, while count is less than or equal to subject count, that's a variable that doesn't exist yet, and then count plus plus. And then inside my loop, let me just make the page a little bigger, inside my loop what I want to do, well I want to output an option. So, I'll take that out of there. You can put it up in here in the php echo, option value 1. I need to just escape these two double quotes.

But instead of being a one, I want this value to be dynamic now. So it's going to be count. So as we go through, each one of these is going to increment, all the way up until we get to subject count. And then I'll put a semicolon just at the end of that. Let's Save it and let's just try it like it is. We're going to need something for subject count though so let's just hard code in a value. Subject count equals 8. Save it, go back and reload our page, position and there you go, our loop worked, at increments from 1 all the way up to 8. Alright so now we don't have a hard coded value, we want to actually figure out how many subjects there are in the database.

There are a couple of ways that we can do that. One is that if you know SQL already, you'll know that you could write a new query that uses SQLs count. And that's a very common way of doing it, to say select the count of the records, and SQL will return the count to you. That's a very efficient way of doing it. I'm going to show you a slightly less efficient way of doing it, but I think it's going to expose a useful technique for us. So, let's say that we're going to use subject set, and we already have something that will find all of our subjects for us. And remember, we used it for our navigation, it's called find all subjects.

But that will return all of our subjects to us. Now, for subject_count, we can use part of the mysqli api, which is mysqli_num_rows, and then we provide it as an argument, our set. So it finds the data, and instead of pulling records off of the data using fetch association, instead we can just ask it, hey result set. How many rows do you have? It'll return a number to us. It'll tell us how many rows it has. And then we'll use that here for our subject count. Now, we don't want the current number of rows, we want the current number of rows plus 1, right? Because we're actually going to increment, we're going to be adding one new one. If we already have four subjects, we want to allow them to have five as the option for the select.

So let's just go over here and try that again. We'll Reload it, and look at that, we come up with 5, exactly as we would expect. Now our new subject.php form is ready to submit values in order to create subjects. But we need a page that is going to process those values. And that's going to be create_subject.php. We're going to create that in the next movie.

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This video is part of

Image for PHP with MySQL Essential Training
PHP with MySQL Essential Training

131 video lessons · 33202 viewers

Kevin Skoglund
Author

 
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  1. 4m 8s
    1. Welcome
      1m 0s
    2. Using the exercise files
      3m 8s
  2. 15m 6s
    1. What is PHP?
      3m 52s
    2. The history of PHP
      2m 51s
    3. Why choose PHP?
      4m 10s
    4. Installation overview
      4m 13s
  3. 54m 53s
    1. Overview
      2m 33s
    2. Working with Apache Web Server
      6m 56s
    3. Changing the document root
      7m 24s
    4. Enabling PHP
      6m 16s
    5. Upgrading PHP
      3m 30s
    6. Configuring PHP
      10m 3s
    7. Installing MySQL
      5m 46s
    8. Configuring MySQL
      7m 24s
    9. Text editor
      5m 1s
  4. 31m 25s
    1. Overview
      3m 27s
    2. Installing WampServer
      5m 46s
    3. Finding the document root
      2m 24s
    4. Configuring PHP
      8m 12s
    5. Configuring MySQL
      5m 45s
    6. Text editor
      5m 51s
  5. 19m 12s
    1. Embedding PHP code on a page
      6m 43s
    2. Outputting dynamic text
      5m 55s
    3. The operational trail
      2m 27s
    4. Inserting code comments
      4m 7s
  6. 1h 18m
    1. Variables
      7m 50s
    2. Strings
      4m 38s
    3. String functions
      8m 54s
    4. Numbers part one: Integers
      6m 27s
    5. Numbers part two: Floating points
      5m 25s
    6. Arrays
      10m 0s
    7. Associative arrays
      6m 37s
    8. Array functions
      6m 33s
    9. Booleans
      3m 50s
    10. NULL and empty
      5m 15s
    11. Type juggling and casting
      8m 27s
    12. Constants
      4m 43s
  7. 27m 37s
    1. If statements
      6m 0s
    2. Else and elseif statements
      4m 16s
    3. Logical operators
      7m 30s
    4. Switch statements
      9m 51s
  8. 42m 15s
    1. While loops
      8m 41s
    2. For loops
      5m 59s
    3. Foreach loops
      8m 16s
    4. Continue
      8m 28s
    5. Break
      4m 8s
    6. Understanding array pointers
      6m 43s
  9. 37m 25s
    1. Defining functions
      8m 25s
    2. Function arguments
      5m 32s
    3. Returning values from a function
      7m 33s
    4. Multiple return values
      4m 53s
    5. Scope and global variables
      6m 2s
    6. Setting default argument values
      5m 0s
  10. 20m 18s
    1. Common problems
      3m 47s
    2. Warnings and errors
      8m 36s
    3. Debugging and troubleshooting
      7m 55s
  11. 57m 57s
    1. Links and URLs
      5m 33s
    2. Using GET values
      5m 35s
    3. Encoding GET values
      8m 41s
    4. Encoding for HTML
      9m 26s
    5. Including and requiring files
      7m 40s
    6. Modifying headers
      6m 45s
    7. Page redirection
      6m 43s
    8. Output buffering
      7m 34s
  12. 1h 3m
    1. Building forms
      7m 28s
    2. Detecting form submissions
      5m 59s
    3. Single-page form processing
      7m 57s
    4. Validating form values
      10m 40s
    5. Problems with validation logic
      9m 54s
    6. Displaying validation errors
      7m 23s
    7. Custom validation functions
      6m 28s
    8. Single-page form with validations
      7m 25s
  13. 28m 5s
    1. Working with cookies
      2m 49s
    2. Setting cookie values
      5m 55s
    3. Reading cookie values
      6m 1s
    4. Unsetting cookie values
      4m 51s
    5. Working with sessions
      8m 29s
  14. 48m 39s
    1. MySQL introduction
      6m 43s
    2. Creating a database
      7m 41s
    3. Creating a database table
      7m 42s
    4. CRUD in MySQL
      5m 48s
    5. Populating a MySQL database
      7m 32s
    6. Relational database tables
      6m 40s
    7. Populating the relational table
      6m 33s
  15. 56m 4s
    1. Database APIs in PHP
      4m 51s
    2. Connecting to MySQL with PHP
      7m 45s
    3. Retrieving data from MySQL
      8m 47s
    4. Working with retrieved data
      6m 12s
    5. Creating records with PHP
      6m 58s
    6. Updating and deleting records with PHP
      9m 6s
    7. SQL injection
      3m 5s
    8. Escaping strings for MySQL
      6m 45s
    9. Introducing prepared statements
      2m 35s
  16. 35m 58s
    1. Blueprinting the application
      7m 19s
    2. Building the CMS database
      5m 14s
    3. Establishing your work area
      4m 38s
    4. Creating and styling the first page
      4m 22s
    5. Making page assets reusable
      6m 36s
    6. Connecting the application to the database
      7m 49s
  17. 32m 49s
    1. Adding pages to the navigation subjects
      5m 58s
    2. Refactoring the navigation
      6m 7s
    3. Selecting pages from the navigation
      6m 2s
    4. Highlighting the current page
      5m 26s
    5. Moving the navigation to a function
      9m 16s
  18. 1h 45m
    1. Finding a subject in the database
      9m 48s
    2. Refactoring the page selection
      10m 52s
    3. Creating a new subject form
      6m 55s
    4. Processing form values and adding subjects
      11m 20s
    5. Passing data in the session
      9m 16s
    6. Validating form values
      9m 40s
    7. Creating an edit subject form
      8m 30s
    8. Using single-page submission
      7m 44s
    9. Deleting a subject
      9m 44s
    10. Cleaning up
      10m 37s
    11. Assignment: Pages CRUD
      4m 30s
    12. Assignment results: Pages CRUD
      6m 10s
  19. 39m 26s
    1. The public appearance
      8m 52s
    2. Using a context for conditional code
      11m 37s
    3. Adding a default subject behavior
      6m 9s
    4. The public content area
      5m 51s
    5. Protecting page visibility
      6m 57s
  20. 1h 3m
    1. User authentication overview
      4m 3s
    2. Admin CRUD
      8m 41s
    3. Encrypting passwords
      7m 26s
    4. Salting passwords
      5m 42s
    5. Adding password encryption to CMS
      11m 54s
    6. New PHP password functions
      3m 13s
    7. Creating a login system
      11m 28s
    8. Checking for authorization
      5m 48s
    9. Creating a logout page
      5m 40s
  21. 2m 4s
    1. Next steps
      2m 4s

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