What is the best way to assign a JavaScript string to a Java string?

This particular dropdown list allows for multiple values to be selected -- A loop has been utilized to populate the options in the list by fetching data from a database.

Here is the javascript function I am attempting to implement in order to retrieve the selected values from the list -- I'm uncertain whether the variable 'str' in the javascript function is successfully capturing the values from the dropdown list. Regarding this, I have the following queries:

  1. How can I assign the javascript variable 'str' to a Java string variable?
  2. Following question 1, how do I pass the Java variable to a servlet? This process is necessary for updating information in the database via the servlet.
  3. If my current approach is incorrect, what would be a more efficient way to extract data from the list and transmit it to the servlet? If possible, could you provide a simple code snippet as an example?
javajavascriptarraysservlets

Answer №1

It's important to understand the distinction between client-side and server-side code when working with JSP. A JSP essentially combines two separate programs - one that operates on the server (enclosed within scriptlets <% or output by custom tags) and one that runs on the user's browser once they receive the response.

Capabilities of Server-side code:

  • Accessing the database
  • Creating Java variables (stored as request or session attributes)
  • Interacting with other Java objects
  • Outputting HTML and inline JavaScript

Capabilities of Client-side code:

  • Creating and manipulating JavaScript variables
  • Dynamically editing the HTML DOM
  • Submitting forms

Limitations of Client-side code:

  • No access to the database
  • Cannot create Java variables
  • No interaction with other Java objects

As a result, it is recommended for the Server-side code to handle generating the HTML code for a form. Users can then fill out this form, submit it, and the data will be sent back to a Servlet on the server. The Servlet can process the data, interact with the database, make any necessary changes, and generate additional HTML content to send back to the user (such as validation errors or thank-you messages).

To further explore this concept, you may find this question about the difference between client-side and server-side programming helpful:

What is the difference between client-side and server-side programming?

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