How is it that when a function is called with just one parameter, it ends up receiving the entire element?

In my table, I have various item numbers listed with corresponding quantity input fields identified by id="itemNumber". Each line also includes a button that triggers a function (onclick="addItemAndQuantity(itemNumber)") to retrieve information based on the selected item number from the table.

Initially, when a quantity is entered and submitted, the function properly receives the itemNumber. However, if I sort the table or switch pages before submitting again, the function unexpectedly receives the entire input element with id and classes such as: input#itemNumber.form-control.w80

This behavior is not desired as it complicates the function logic. The table's functionality is managed using DataTables, which seems to impact this issue, but I have been unable to resolve it despite efforts. Any guidance on this matter would be greatly appreciated.

The expected outcome should always mirror the initial interaction seen in this image: https://i.sstatic.net/XVVEU.png

However, after sorting or navigating within the table, the function unexpectedly receives the full input element as shown here: https://i.sstatic.net/QCmgi.png

A simplified representation of the table structure is:

<table class="table table-sm table--hover table--bordered" id="dataTableAddItemToOrder">
   <thead>
      <tr>
         <th scope="col"&g t;Item number</th>
         <th scope="col"& gt;Description</th>
         <th scope="col"& gt;Quantity</th>
         <th scope="col"& gt;Actions</th>
      </tr>
   </thead>
   <tbody>
      @foreach (var listItem in Model.AllItems)
      {
         <tr>
            <td>@listItem.ItemNumber</td>
            <td>@listItem.Description</td>
            <td>
               <input type="text" id="@listItem.ItemNumber" name="itemQuantity" placeholder="0" class="form-control w80" autocomplete="off" />
            </td>
            <td>
               <button type="button" class="btn hsa-btn-primary" onclick=& quot;addItemAndQuantity(@listItem.ItemNumber)">Add</button>
            </td>
         </tr>
      }
   </tbody>
</table>

A simplified version of the associated script is:

function addItemAndQuantity(itemNumber) {
     let input = document.getElementById(itemNumber);
}

Answer №1

Apologies for the error, please attempt the following:

//define your variable
const item = document.getElementById(number);

//accessing the text field value:
item.value

Answer №2

After experimenting further, I discovered a particular pattern.

I've identified two categories of item numbers. There are those that consist solely of numbers, like 300012345, and then there are those with letters included, such as T3730500. The pure number items were correctly interpreted as numbers, while the others were treated as strings. Strangely, it was only the string type items that caused the issue of passing in the entire input object. (That part still remains puzzling)

The solution revealed itself to be ensuring that when passing the item number to the function, it must always be passed as a string, regardless of whether it is already a string or a number. Therefore, all I had to do was surround the parameter with single quotes like this:

onclick="addItemAndQuantity('@listItem.ItemNumber')"

I want to express my gratitude to those who provided suggestions for a potential solution. Although it wasn't the exact solution I sought, their insights helped me approach the problem from a different perspective.

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