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Hello,<br />
<br />
you need to do this either throw java script or ajax. and I recommend java script in your case.
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Hello,

you need to do this either throw java script or ajax. and I recommend java script in your case.

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<div class="content wysiwyg-content">
I have a form where some values are pulled from a database, but I will use a static form for example. <br />
<br />
I have a form where I need to choose a value from a dropdown and have calculations performed and populate a hidden field.<br />
<br />
&lt;form id=&quot;form1 name=&quot;form1&quot; method=&quot;&quot; action=&quot;&quot;&gt;<br />
&lt;select name=&quot;service&quot;&gt;<br />
&lt;option&gt;10&lt;/option&gt;<br />
&lt;option&gt;20&lt;/option&gt;<br />
&lt;option&gt;30&lt;/option&gt;<br />
&lt;/select&gt;<br />
&lt;input type=&quot;text&quot; name=&quot;totalHours&quot; /&gt;<br />
&lt;input type=&quot;hidden&quot; name=&quot;totalCost&quot; /&gt;<br />
&lt;/form&gt;<br />
<br />
My form is more complex but I should be able to build once I get started.<br />
<br />
Example: If I choose 10 from the select menu and then enter 1.5 in the totalHours textbox, I need the page to automatically populate the hidden field with the 10 x 1.5 hours. I am not sure the best way to approach this. My pages are .php.<br />
<br />
Any solutions?
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</div>


I have a form where some values are pulled from a database, but I will use a static form for example. 

I have a form where I need to choose a value from a dropdown and have calculations performed and populate a hidden field.

<form id="form1 name="form1" method="" action="">
<select name="service">
<option>10</option>
<option>20</option>
<option>30</option>
</select>
<input type="text" name="totalHours" />
<input type="hidden" name="totalCost" />
</form>

My form is more complex but I should be able to build once I get started.

Example: If I choose 10 from the select menu and then enter 1.5 in the totalHours textbox, I need the page to automatically populate the hidden field with the 10 x 1.5 hours. I am not sure the best way to approach this. My pages are .php.

Any solutions?

Auto Calculation Solution

PHP is a widely-used server-side scripting language especially suited for web development, powering tens of millions of sites from Facebook to personal WordPress blogs. PHP is often paired with the MySQL relational database, but includes support for most other mainstream databases. By utilizing different Server APIs, PHP can work on many different web servers as a server-side scripting language.

JavaScript is a dynamic, object-based language commonly used for client-side scripting in web browsers. Recently, server side JavaScript frameworks have also emerged. JavaScript runs on nearly every operating system and  in almost every mainstream web browser.

JavaScript

HTML (HyperText Markup Language) is the main markup language for creating web pages and other information to be displayed in a web browser, providing both the structure and content for what is sent from a web server through the use of tags. The current implementation of the HTML specification is HTML5.