How to Convert HTML Table Values to JSON Array in JavaScript

Learn how to transform values from an HTML table into a JSON array in JavaScript while ensuring data integrity and type correctness.
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How to Convert HTML Table Values to JSON Array in JavaScript

In web development, it often becomes necessary to extract and manipulate data. One common situation developers encounter is converting data from an HTML table to a JSON array. However, things can get tricky when you need to exclude rows based on specific conditions, such as an empty input in the last row, and ensure that numbers are stored as integers in the output. In this guide, we will explore how to achieve this using JavaScript.

Problem Statement

Suppose you have an HTML table structured to keep track of various items in stock, along with their quantities and other relevant information. The challenge is to convert this table data into a JSON array while considering the following:

Skip any rows where input fields in the last column (like quantity) are empty.

Convert certain string values into integers (for example, stock quantities).

Here's a brief look at the code snippet we’ll be working with:

[[See Video to Reveal this Text or Code Snippet]]

The Step-by-Step Solution

1. Select the Table Rows

First, we need to gather all the rows from the HTML table except for the header row. This can be done using the following line of code:

[[See Video to Reveal this Text or Code Snippet]]

2. Create an Array of JSON Objects

3. Filtering Out Unwanted Rows

We'll use the filter() method to ensure that only rows with valid data (i.e., non-empty last column) are included in the resulting JSON array.

[[See Video to Reveal this Text or Code Snippet]]

4. Converting Strings to Integers

To convert specified fields from strings to integers, we can loop through the resulting array and use parseInt().

[[See Video to Reveal this Text or Code Snippet]]

5. Final Output

Now that we have the desired structure, we can convert our array of objects into a JSON string and display it.

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By following the steps outlined above, we have successfully transformed the data from an HTML table into a well-structured JSON array while ensuring that all necessary conditions are met. This process not only helps in maintaining data integrity but also makes it easier to work with numbers in JavaScript applications.

Feel free to experiment with the code in your own environment and see how it works in real-time! Happy coding!