How to check the text is only in numbering form after data is input in Javascript

0
votes

How to valid the text after the data is insert into the text. If input with alphabet, it will pop out with alert at the same time. The data should be only insert with numbering form. HTML should be continue use by oninput or oncheck or other on function?

function chicken()
{
    var foodchicken=0;
    var theForm = document.forms["energyform"];
    var chicken = theForm.elements["chicken"];
    var ttlchicken = document.getElementById("textbox1").value;

    if(chicken.checked===true)
    {
        foodchicken = ttlchicken*10;
    }
    return foodchicken;
}

function calculateTotal()
{
var HMontotalco = chicken()
var hmco = document.getElementById('totalHMonthCst').innerHTML = +HMontotalco.toFixed(2)
}
<body onload='hideTotal()'>
    <div id="all">
        <form  id="energyform" onsubmit="return false;">
        <div>
            <div class="cont_order">
               <fieldset>
               <br/>
                <label for='chicken' class="chick">Chicken </label></hr>
                <input type="checkbox" id="chicken" name='chicken' onchange="calculateTotal()">
                <input type="text" oninput="calculateTotal();" id="textbox1" name="textbox1" placeholder="Enter total chicken" />
<br/>
                <div id="totalHMonthCst">0</div>
                       </div>  
       </form>
                    </div>

</body>
              </html>
javascripthtmlforms
if (isNaN(ttlchicken)) { alert('hey!'); return 0; } Or, use a type="number" input. - Johnny Mopp