validate input field for numeric value

[idsanjeev]

I try to validate inpute field for weight that accept only numeric value like 65.12 not allow any special character or character but allow '.' .
thanks
jha

[acoder]

What have you attempted so far?

[idsanjeev]

What have you attempted so far?

i am using this code for validation but this way only can check null,(-)value,and character with special caracter. but don't know how can do with my requirement like 45.10

function ck_wt(obj)
{
if(obj.value=="")
{
obj.focus();
alert("Wt. Must be entered.")
}
else if(obj.value<0 || obj.value=="")
{
obj.focus();
alert("wait must be +ve")
return;
}
  else if(!obj.value.match(/^\d+$/)){
    obj.focus();
    alert("Only numbers are allowed.");
    return;
  }
}

thanks
jha

[acoder]

Either use parseFloat and isNaN or use a simple float regular expression, e.g. /^\d{2}\.\d{2}$/

[idsanjeev]

Either use parseFloat and isNaN or use a simple float regular expression, e.g. /^\d{2}\.\d{2}$/

the code for check wait is modified by but not work it accepted special character like 4.5a or 4.5;aq but i wants to 4.5 only or 4

function ck_wt(obj)
{
if(obj.value=="")
{
obj.focus();
alert("Wt. Must be entered.")
}
else if(obj.value<0 || obj.value=="")
{
obj.focus();
alert("wait must be +ve")
}
else if(obj.value.match(/^\d{2}\.\d{2}$/))
{
obj.focus();
alert ("testing")
return;
}
} 

jha

[maminx]

the code for check wait is modified by but not work it accepted special character like 4.5a or 4.5;aq but i wants to 4.5 only or 4

function ck_wt(obj)
{
if(obj.value=="")
{
obj.focus();
alert("Wt. Must be entered.")
}
else if(obj.value<0 || obj.value=="")
{
obj.focus();
alert("wait must be +ve")
}
else if(obj.value.match(/^\d{2}\.\d{2}$/))
{
obj.focus();
alert ("testing")
return;
}
} 

jha

i'm using this library below, u can use this

function numbersonly(myfield, e, dec) {
    var key;
    var keychar;
 
    if (window.event)
       key = window.event.keyCode;
    else if (e)
       key = e.which;
    else
       return true;
    keychar = String.fromCharCode(key);
 
    // control keys
    if ((key==null) || (key==0) || (key==8) || 
        (key==9) || (key==13) || (key==27) )
       return true;
 
    // numbers
    else if ((("-0123456789").indexOf(keychar) > -1))
    //else if ((("0123456789")))
       return true;
 
    // decimal point jump
    else if (dec && (keychar == "."))
       {
       myfield.form.elements[dec].focus();
       return false;
       }
    else
       return false;
}

and to call that function in HTML form is with this event below :

onkeypress="return numbersonly(this, event,true)"


hope usefull,

kind regards, maminx

[gits]

i'm using this library below, u can use this

function numbersonly(myfield, e, dec) {
    var key;
    var keychar;
 
    if (window.event)
       key = window.event.keyCode;
    else if (e)
       key = e.which;
    else
       return true;
    keychar = String.fromCharCode(key);
 
    // control keys
    if ((key==null) || (key==0) || (key==8) || 
        (key==9) || (key==13) || (key==27) )
       return true;
 
    // numbers
    else if ((("-0123456789").indexOf(keychar) > -1))
    //else if ((("0123456789")))
       return true;
 
    // decimal point jump
    else if (dec && (keychar == "."))
       {
       myfield.form.elements[dec].focus();
       return false;
       }
    else
       return false;
}

and to call that function in HTML form is with this event below :

onkeypress="return numbersonly(this, event,true)"


hope usefull,

kind regards, maminx

@maminx: according to the posting guidelines USE THE CODE TAGS ... i'm getting tyred fixing every single post by you with that ...

regards,
MOD

[acoder]

the code for check wait is modified by but not work it accepted special character like 4.5a or 4.5;aq but i wants to 4.5 only or 4

Oh, I see you want any type of float number. What I suggested earlier was a very simple version from what you posted, but it seems you need something a little more complete. This link should help.

[acoder]

i'm using this library below, u can use this

...

It allows multiple "." decimal characters.