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    <p>i have a function that increments a number, takes the total and multiplies it by a price. However, when I click the button that increments for the first time it doesn't do anything. I click the button a second time and it works. However if I then click the button that decreases, then it does the previous function (e.g. adding) then pressing it a second time will decrease the value.</p> <p>I understand that the <code>onClick="myFunction()"</code> may be in the wrong place, however I don't know where to put it. I want the total to be calculated automatically. A demo can be found at <a href="http://alpha.kentishtours.co.uk/destinations/bruges.php" rel="nofollow">http://alpha.kentishtours.co.uk/destinations/bruges.php</a></p> <p>The function that takes the value and multiplies it and calculates the total.</p> <pre><code>function myFunction() { var a = document.getElementById('adult').value; z=39; x=a*z; var c = document.getElementById('child').value; if(a &gt;= 1) { a=+30; } else { a=+39; } b=c; c=a*b d=x+c document.getElementById("total").innerHTML=d; document.getElementById("value").value = d; }` </code></pre> <p>These are the buttons that increment the number and call the function to calculate. </p> <pre><code>&lt;div class="calculator"&gt; &lt;div class="calculator-submodule input-group"&gt; &lt;h4&gt;Adult (12+)&lt;/h4&gt; &lt;button class="btn theme-btn" id="decrease" value="Decrease Value" onClick="myFunction()" &gt;-&lt;/button&gt; &lt;input type="text" id="adult" value="1" class="form-control input-usmall" min="0" disabled&gt; &lt;button class="btn theme-btn" id="increase" value="Increase Value" onClick="myFunction()" &gt;+&lt;/button&gt; &lt;/div&gt; &lt;div class="calculator-submodule input-group"&gt; &lt;h4&gt;Child (2-11)&lt;/h4&gt; &lt;button class="btn theme-btn" id="decreasec" value="Decrease Value" onClick="myFunction()" &gt;-&lt;/button&gt; &lt;input type="text" id="child" value="0" class="form-control input-usmall" min="0" disabled&gt; &lt;button class="btn theme-btn" id="increasec" value="Increase Value" onClick="myFunction()" &gt;+&lt;/button&gt; &lt;/div&gt; &lt;div class="calculator-submodule"&gt; &lt;span class="pound"&gt;£&lt;/span&gt; &lt;span id="total"&gt;39&lt;/span&gt;&lt;span class="pound"&gt;.00&lt;/span&gt; &lt;/div&gt; </code></pre>
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    1. COWhat is the logic of your function? I'm not sure what all it's doing. You might also try using onmouseup, and seeing if that solves it.
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      1. USDavid
    2. COMaybe create all your variable at the top with the `var` keyword, to not pollute the global namespace. And then rename that to something more understandable. Also make sure, that you are dealing with numbers, and the right type of numbers. Having a `0.5` *adult* and `0.1` *child* can be problematic.
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      1. USPoetro
    3. CO@David the idea of the function is for the user to select the quantity of tickets. They increment using the buttons which uses the increment file i have just added. This value is then multiplied by the price of the ticket which displays the total.
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      1. USAlex
 

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