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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
| <meta http-equiv="X-UA-Compatible" content="ie=edge"> | |
| <title>Putting User Input into JS Objects</title> | |
| <style> | |
| .formBox{ | |
| padding: 0.5rem 2rem; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <form> | |
| <div class="formBox"> | |
| <label for="title">Movie</label> | |
| <input type="text" id="title" placeholder="Title"/> | |
| </div> | |
| <div class="formBox"> | |
| <label for="yr">Year</label> | |
| <input type="number" id="yr" placeholder="Year"/> | |
| </div> | |
| <div class="formBox"> | |
| <button id="btn">Click to Add</button> | |
| </div> | |
| <div id="msg"> | |
| <pre></pre> | |
| </div> | |
| </form> | |
| <script> | |
| let movies = []; | |
| // example {id:1592304983049, title: 'Deadpool', year: 2015} | |
| const addMovie = (ev)=>{ | |
| ev.preventDefault(); //to stop the form submitting | |
| let movie = { | |
| id: Date.now(), | |
| title: document.getElementById('title').value, | |
| year: document.getElementById('yr').value | |
| } | |
| movies.push(movie); | |
| document.forms[0].reset(); // to clear the form for the next entries | |
| //document.querySelector('form').reset(); | |
| //for display purposes only | |
| console.warn('added' , {movies} ); | |
| let pre = document.querySelector('#msg pre'); | |
| pre.textContent = '\n' + JSON.stringify(movies, '\t', 2); | |
| //saving to localStorage | |
| localStorage.setItem('MyMovieList', JSON.stringify(movies) ); | |
| } | |
| document.addEventListener('DOMContentLoaded', ()=>{ | |
| document.getElementById('btn').addEventListener('click', addMovie); | |
| }); | |
| </script> | |
| </body> | |
| </html> |
Excellent video! I have 2 questions...
1.) How would we NOT include key/value pair in json object if there is no value in form input?
2.) How would we create nested json object?
- You would have to loop through the Object and use the
deletekeyword to remove properties whose value was an empty string. - JSON is a String. It is a string representation of whatever Object you pass to the
JSON.stringifymethod. You don't edit the string. You change the object then stringify it.
What is the purpose of number 2 inside
pre.textContent = '\n' + JSON.stringify(movies, '\t', 2);?
Thank you so much in advance!
I am learning a great deal from you!In this example it is the number of tab characters to place on each line.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify
Man,i never knew we could do something like that.Thank you so much Steve!
thank you sir
If I want to add the data to a table in a tabulated form? How can I modify this code?
Hello I have a color change and I want to download a new color I want to see if anyone can help me The color and format file is json
please how do i validate if all the fields in the form is filled in before it can be submitted. thank you
I have two videos about form validation.
https://www.youtube.com/watch?v=hAqglX3Jm7Y
https://www.youtube.com/watch?v=D9JHizCAx8U
This video - https://www.youtube.com/watch?v=gL8M9Sl5QLs is about uploading data with fetch.
I have a full playlist on how fetch / AJAX works.
It is important to note that you can't upload directly to a database. You can use fetch to send an HTTP Request that can include files or data. There needs to be a server-side script (API) that handles whatever you are sending and it will be responsible for putting things into the server-side database.
Jeez, thanks so much! I have been using React for so long I forgot how to use Vanilla! How would you access that state object elsewhere in the app? For example, 2 inputs to capture (ex.) string1 and string2, add that to a user object (done, tutorial above) and then access that object for another api call?
If you are talking about the movies array - in this simple example it is just a global variable.
This isn't a production ready code base though, just an illustration of some concepts for my students.
I have other videos on finite state machines, and what a reducer is - https://www.youtube.com/watch?v=TOhUqDGNFtA that help students understand the vanilla JS behind React.
Thank you! The video reference was helpful. I like how simple and short your videos are. Very helpful!
great lesson! could you please tell me how to store the form in cache API instead of localStorage? Thank you!
Cache API stores files, not data. You would have to create a file, and write your data to that file, then save the file.
Cache API video - https://www.youtube.com/watch?v=Gu0t2EW2kfU
Hello I'm getting the following error:
Uncaught TypeError: Cannot read properties of null (reading 'addEventListener') at HTMLDocument.<anonymous> (index.html:216:43) (anonymous) @ index.html:216
In this example it is the number of tab characters to place on each line.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify