Serialize a series of select boxes to optimize for AJAX POST requests

To better explain my issue, let's consider a simple example:

Imagine I have a form that collects information about a user:

<form action="#" method="post" id="myform">
    <input type="text" name="fname" />
    <input type="text" name="sname" />
    <input type="text" name="birthdate" />
    <select name="hobbies">
        <option>Programming</option>
        <option>Eating cats</option>
        <option>Explaining string theory to my grandmother</option>
    </select>
</form>

I want to send this form data to the server using an AJAX call for a quick response without reloading the page:

$.post("myserverscript.php", $('#myform').serialize(), function(){...callback...});

So far, everything is working well.

Now, I need to gather the same information for multiple users on the same page. To achieve this, I simply add [] to the input names:

<form action="#" method="post" id="myform">
    <input type="text" name="fname[]" />
    <input type="text" name="sname[]" />
    <input type="text" name="birthdate[]" />
    <select name="hobbies[]">
        <option>Programming</option>
        <option>Eating cats</option>
        <option>Explaining string theory to my grandmother</option>
    </select>
</form>

Again, everything seems to be in order.

However, when I attempt to allow users to select more than one hobby each:

<form action="#" method="post" id="myform">
    <input type="text" name="fname[]" />
    <input type="text" name="sname[]" />
    <input type="text" name="birthdate[]" />
    <select name="hobbies[]" multiple>
        <option>Programming</option>
        <option>Eating cats</option>
        <option>Explaining string theory to my grandmother</option>
    </select>
</form>

This is where things get tricky. When I use the serialize() function now, all hobbies are grouped into one array, making it difficult to link users with their respective hobbies.

I attempted using [][] instead of [], but this still doesn't provide the desired user-to-hobby mapping.

The only solution I can think of is creating a custom serialize() function to format the data as needed.

Is there a simpler or more elegant approach to tackle this issue?

Answer №1

My usual method involves adding the UserID to the input name, separated by an underscore.

Instead of doing this:

<input type="text" name="firstname[]" />

You would do:

<input type="text" name="firstname_56789" />

Then on the server-side, you can split the input names using the underscore. The first part is the input name, the second part is the UserID, and that's it!

Answer №2

I encountered a similar issue, but my solution involved assigning each user a unique array

for instance, check out this code snippet

<form action="#" method="post" id="myform">
    <input type="text" name="user1[fname]" />
    <input type="text" name="user1[sname]" />
    <input type="text" name="user1[birthdate]" />
    <select name="user1[hobbies]" multiple>
        <option>Programming</option>
        <option>Eating cats</option>
        <option>Explaining string theory to my grandmother</option>
    </select>
    <a href="#" id="submit">Submit</a>
</form>

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