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POjQuery subtract amount from sum of input fields when discount code entered
 

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  1. POjQuery subtract amount from sum of input fields when discount code entered
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    <p>OK, I'm pulling my hair out over this. I have a form consisting of mainly drop-down selections and check boxes - these all have values assigned so as the user selects things, a total sum value of everything is calculated.</p> <p>My last input field is a text input called 'Discount Code' I want to be able to enter a set code and that subtract a fixed amount from the sum. </p> <p>Below is the script that I'm using to detect if the discount code is correct:</p> <pre><code>$(".apply_discount").click(function() { if ($("input[name='discount']").val() === "DISTR50") { $("span").text("Validated...").show(); $("input[name='discount']").attr("value",500.99); return true; } $("span").text("Not a valid discount code").show().fadeOut(2000); return false; }); </code></pre> <p>and here is the code which calculates the sum of my inputs:</p> <pre><code>//iterate through each textboxes and add keyup //handler to trigger sum event $(".txt, .select, .checkbox").each(function() { $(this).change(function(){ calculateSum(); }); }); }); function calculateSum() { var discount = $("input[name='discount']").attr('value'); var sum = 0; //iterate through each textboxes and add the values $(".txt, .select, .checkbox:checked").each(function() { //add only if the value is number if(!isNaN(this.value) &amp;&amp; this.value.length!=0) { sum += parseFloat(this.value); } }); //.toFixed() method will roundoff the final sum to 2 decimal places var calc_total = sum; $("#sum").html(calc_total.toFixed(2)); } </code></pre> <p>as you can see, the sum is appended to a div called #sum - I can't figure out how I subtract the value of the discount input.</p> <p>you can see my code in action here: <a href="http://www.samskirrow.com/projects/distr/index3.html" rel="nofollow">http://www.samskirrow.com/projects/distr/index3.html</a></p> <p>Here it is in a JSfiddle (calculate mileage section doesn't work though) <a href="http://jsfiddle.net/bZhK4/" rel="nofollow">http://jsfiddle.net/bZhK4/</a></p>
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