hope hope - 2 years ago 67
HTML Question

How to multiple (a*b) two input text value and show it Dynamicly with text change in javascript?

i want to show the money that customer must pay and my inputs are like this :

<input type="text" class="form-control" placeholder="cost " id="txt" name="credit">

<input type="text" class="form-control" placeholder="quantity" id="txt" name="limit">

when the input text is changing i want to show the total cost (quantity*cost) in a
tag Dynamicly how can it be with javascript?

Answer Source

You can try this:

<input type="text" class="form-control" placeholder="cost " id="credit" name="credit" onchange="calculate()">
<input type="text" class="form-control" placeholder="quantity" id="limit" name="limit" onchange="calculate()">
<p id="result"></p>

And javascript part:

function calculate() {
   var cost = Number(document.getElementById("credit"));
   var limit = Number(document.getElementById("limit"));

   document.getElementById("result").innerHTML= cost*limit;


You must ensure you entered numbers in inputs.

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