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Thread: Trying to get to fields to add together

  1. #1
    Join Date
    Jan 2018
    Posts
    10

    Trying to get to fields to add together

    Hi

    Would appreciate some advice as an amateur!

    I'm trying to get the code below to add up 2 rows/fields to give the total in the last field <input type="sum" input name="amount" value="" id="result" placeholder="Amount to pay..."> but it doesn't add the 2 together!


    <div class="form-row">
    <label>Property or Property Ref:</label>
    <div class="input-container">
    <input type="text" name="property" placeholder="Please tell us which property this payment relates to...">
    </div>
    </div>

    <script type="text/javascript">
    function calc(A,B,SUM) {
    var one = Number(A);
    if (isNaN(one)) { alert('Invalid entry: '+A); one=0; }
    var two = Number(document.getElementById(B).value);
    if (isNaN(two)) { alert('Invalid entry: '+B); two=0; }
    document.getElementById(SUM).value = one + two;
    }
    </script>

    <div class="form-row">
    <label>Amount to Pay (&pound</label>
    <div class="input-container">
    <input type="text" name="sum1" placeholder="Amount to pay...">
    <id="op1" value="" onChange="calc(this.value,'op2','result')" />
    </div>
    </div>


    <div class="form-row">
    <label>Non-internet/bank transfer handling fee:</label>
    <div class="input-container">
    <input name="sum2" value="5.00" id="op2" onChange="calc(this.value,'op1','result')" />


    <div class="form-row">
    <label>Total to Pay (&pound</label>
    <div class="input-container">
    <input type="sum" input name="amount" value="" id="result" placeholder="Amount to pay...">
    </div>
    </div>
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  2. #2
    Join Date
    Mar 2007
    Location
    localhost
    Posts
    5,855
    Please don't make duplicate posts. The reason is it stops confusion and you get your response faster.
    --> JavaScript Frameworks like JQuery, Angular, Node <--
    ... and please remember to wrap code with forum BBCode tags:-

    [CODE]...[/CODE] [HTML]...[/HTML] [PHP]...[/PHP]

    If you can't think outside the box, you will be trapped forever with no escape...
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