Is it possible to invoke a Java function from a text box on an HTML page?

Question

Is it possible to invoke a Java function from a text box on an HTML page?

For a web project using JSP, MySQL, AJAX with Netbeans and MySQL, I have three textboxes. Two textboxes are for user input, and the third should display the product of the two input values.

How can I achieve this? Should I make an AJAX call or can I call a Java function in the third textbox?

The code is as follows:

<input type="text" value="" name="quantity"/>
</td><td><input type="text" value="" name="price"/>
</td><td><input type="text" value="" name="total"/>

In the value attribute of the textbox named "total", can I call a Java function like value="getTotal()"? If so, how can I access the other two values?

Alternatively, should I make an AJAX call?

javascript mysql ajax jsp netbeans

Answer 1

Answer №1

Skip using Java functions and opt for client-side scripting instead.

  <td><input type="text" value="" name="quantity" onblur="Calculate()"/>
  </td><td><input type="text" value="" name="price" onblur="Calculate()"/>
  </td><td><input type="text" value="" name="total"/>


  <script type="text/javascript">

  function Calculate()
  {

       var txt1 = document.getElementById("quantity");
       var txt2 = document.getElementById("price");
       var txt3 = document.getElementById("total");
       if ((txt1.value != "") && (txt2.value != ""))
       {
            txt3.value = parseInt(txt1.value) * parseInt(txt2.value); 
       }

  }

  </script>

Make the total textbox read-only or consider using a label instead.

Thank you

Answer 2

Skip using Java functions and opt for client-side scripting instead.

  <td><input type="text" value="" name="quantity" onblur="Calculate()"/>
  </td><td><input type="text" value="" name="price" onblur="Calculate()"/>
  </td><td><input type="text" value="" name="total"/>


  <script type="text/javascript">

  function Calculate()
  {

       var txt1 = document.getElementById("quantity");
       var txt2 = document.getElementById("price");
       var txt3 = document.getElementById("total");
       if ((txt1.value != "") && (txt2.value != ""))
       {
            txt3.value = parseInt(txt1.value) * parseInt(txt2.value); 
       }

  }

  </script>

Make the total textbox read-only or consider using a label instead.

Thank you

Answer 3

Answer №2

If you're looking to perform a basic calculation like the one you described, it can easily be achieved using straightforward JavaScript. Simply include the following code snippet in your script:

function calculateTotal(){
 var quantity = document.getElementById("quantity").value;
 var price = document.getElementById("price").value;
 var total = parseInt(quantity, 10) * parseFloat(price);
 document.getElementById("total").value = total;

Then, update your HTML input field to trigger the JavaScript function whenever there is a change:

<input type="text" value="" id="quantity" onchange="calculateTotal()"/>

It's important to note that making a server call for a simple calculation like this is not recommended.

Answer 4

If you're looking to perform a basic calculation like the one you described, it can easily be achieved using straightforward JavaScript. Simply include the following code snippet in your script:

function calculateTotal(){
 var quantity = document.getElementById("quantity").value;
 var price = document.getElementById("price").value;
 var total = parseInt(quantity, 10) * parseFloat(price);
 document.getElementById("total").value = total;

Then, update your HTML input field to trigger the JavaScript function whenever there is a change:

<input type="text" value="" id="quantity" onchange="calculateTotal()"/>

It's important to note that making a server call for a simple calculation like this is not recommended.

Answer 5

Answer №3

Consider utilizing jQuery for dynamic text box value setting based on user input in other fields. I successfully incorporated this feature in a recent shopping cart project for a client. Additionally, jQuery offers a .ajax() method that is user-friendly.

For more information, explore the following resources:

http://docs.jquery.com/How_jQuery_Works

http://api.jquery.com/category/ajax/

Unfortunately, I'm unable to provide a coded response at the moment. I hope this information is still helpful for you.

Answer 6

Consider utilizing jQuery for dynamic text box value setting based on user input in other fields. I successfully incorporated this feature in a recent shopping cart project for a client. Additionally, jQuery offers a .ajax() method that is user-friendly.

For more information, explore the following resources:

http://docs.jquery.com/How_jQuery_Works

http://api.jquery.com/category/ajax/

Unfortunately, I'm unable to provide a coded response at the moment. I hope this information is still helpful for you.

Answer 7

Answer №4

  <HTML>
  <HEAD>
 <TITLE></TITLE>
     <script type="text/javascript">

     function Multiply()
      {

       var input1 = document.getElementById("FirstNumber");
       var input2 = document.getElementById("SecondNumber");
       var result = document.getElementById("Result");
       if ((input1.value != "") && (input2.value != ""))
       {
            result.value = parseInt(input1.value) * parseInt(input2.value); 
       }

      }

    </script>

 <input id="FirstNumber" type="text" value="" onblur="Multiply()" style="width:50px"/> * 
 <input id="SecondNumber" type="text" value="" onblur="Multiply()" style="width:50px"/>
 <input id="Result" type="text" style="width:50px"/>
 </FORM>
 </BODY>
 </HTML>

Answer 8

  <HTML>
  <HEAD>
 <TITLE></TITLE>
     <script type="text/javascript">

     function Multiply()
      {

       var input1 = document.getElementById("FirstNumber");
       var input2 = document.getElementById("SecondNumber");
       var result = document.getElementById("Result");
       if ((input1.value != "") && (input2.value != ""))
       {
            result.value = parseInt(input1.value) * parseInt(input2.value); 
       }

      }

    </script>

 <input id="FirstNumber" type="text" value="" onblur="Multiply()" style="width:50px"/> * 
 <input id="SecondNumber" type="text" value="" onblur="Multiply()" style="width:50px"/>
 <input id="Result" type="text" style="width:50px"/>
 </FORM>
 </BODY>
 </HTML>

Is it possible to invoke a Java function from a text box on an HTML page?

Answer №1

Answer №2

Answer №3

Answer №4

Similar questions

What is the best method for implementing page transitions between components in NextJS?

"Trying to refresh your chart.js chart with updated data?”

Twilio - encountering difficulties processing phone number upon submission

When the component mounts in React using firestore and Redux, the onClick event is triggered instantly

Unable to use onSubmit with enter key in render props (React)

Building a Loading Bar with Two Images Using JavaScript and CSS

Elements on the page appear and disappear as you scroll down

Exploring Angular2's interaction with HTML5 local storage

The website that had been functioning suddenly ceased operations without any modifications

Saving real-time information to MongoDB with Node.js

Can Express POST / GET handlers accommodate the use of jQuery?

Comparisons do not function properly with IFNULL on DATETIME data

What methods can I use to distinguish a status and perform functions in PHP MySQL?

Customize the size of data points on your Angular 2 chart with variable

What is the best approach to animating a specified quantity of divs with CSS and javascript?

Sum the total transaction amount from individual subqueries in SQL on a monthly basis

Creating a single row on the Wordpress options page with a colspan in the first row

Converting CSS into jQuery

What is the best way to elegantly finish a live CSS animation when hovering?

Conditionally defining variables in JavaScript only if they are currently undefined