<a href="https://bytes.com/topic/javascript/answers/895106-problem-validating-amount">problem in validating the amount

8,658

Expert Mod 8TB

it’s far more easy to test, whether the whole content is a valid number.

functions you can use for that (depending on the allowed number type)
- parseInt()
- parseFloat()
- isNaN()
- isFinite()

e.g.

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 if (isNaN(CostValid)) {

    alert("input is not a number.");

    return false;

}

Sep 8 '10 #2

149

100+

hi,
i had changed according what u suggested..here is the code..it is getting validated if i enter 12.58.25..but if i enter 12.58..it is not taking..nd the form is not going to another form..can u help me

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 <script>

    function test(form) {
 
        if (form.Cost.value == "")

            {

                alert("Enter Content Cost");

                form.Cost.focus();

                return (false);

            }

            var CostValid = document.getElementById('uploadtextContCost').value;
 
            if(!isNaN(CostValid) && CostValid >= 0 && CostValid> 0) {

                return true;

            } else {

                alert("you must enter a valid salary");

                return false;

            }
 
    }

</script>

</head>

<body>

<form action="login.jsp">Cost:<INPUT TYPE="TEXT" NAME="Cost"

    id="uploadtextContCost">Enter reference Number (e.g. F647) <INPUT

    TYPE="button" value="submit" onClick=test(this.form);;></form>

</body>

</html>

Sep 8 '10 #3

8,658

Expert Mod 8TB

well, I wrote

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if (isNaN(…))

not

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if (!isNaN(…))

PS. NaN => Not a Number

Sep 8 '10 #4

149

100+

i need to get as 12.58..if i give single no. it is going to other form..in my form..the cost value can be anything like 1.00 or 0.25..so how to code it..

Sep 8 '10 #5

8,658

Expert Mod 8TB

as I already showed in the example.

Sep 8 '10 #6

149

100+

i tried..if i enter 12.58 it is going to other form..but if i enter 12.58.25 it it also going to other form.

Expand|Select|Wrap|Line Numbers

 <script>

    function test(form) {
 
        if (form.Cost.value == "")

            {

                alert("Enter Content Cost");

                form.Cost.focus();

                return (false);

            }

            var CostValid = document.getElementById('uploadtextContCost').value;
 
            if(isNaN(CostValid) && CostValid >= 0 ) {

                return true;

            } else {

                alert("you must enter a valid salary");

                return false;

            }
 
    }

</script>

</head>

<body>

<form action="login.jsp">Cost:<INPUT TYPE="TEXT" NAME="Cost"

    id="uploadtextContCost"><INPUT

    TYPE="button" value="submit" onClick=test(this.form);;></form>

</body>

</html>

Sep 8 '10 #7

8,658

Expert Mod 8TB

that has nothing to do with the validation. that has something to do with event handling.

in DOM 2, you would simply cancel the event action by Event.preventDefault() (though you would have to use the submit event, not the click event). in DOM 0 you must explicitly return false in the event handler (the event handler is the event attribute’s value, not the return value of the called function)

besides that, your logic is screwed. cf. isNaN()

PS. if you don’t exactly know what a (native) JavaScript function does, look it up!

Sep 8 '10 #8

149

100+

ok.i'll check it

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