Java Script Validations

Check the Text field Value is Empty or not

function IsValueEmpty(ctrl) {

if (ctrl.value== '') {

        alert("This field cannot be empty!");

        return false;

 }

}

   

Check the selected index of the dropdown

function IsValueEmpty(ctrl) {

if (ctrl.selectedIndex == 0) {

        alert("Please select the one of the Item from the dropdown!");

        return false;

 }

}

Check the selected value of the checkbox

function Ischecked(ctrl) {

if (ctrl.checked == false) {

        alert("Please checked the value of the checkbox !");

        return false;

 }

}

Email Check

1)

function echeck(str) {

var at="@"

var dot="."

var lat=str.indexOf(at)

var lstr=str.length

var ldot = str.indexOf(dot)

if (str != '') {

    if (str.indexOf(at) == -1) {

        alert("Invalid E-mail ID")

        return false

    }

    if (str.indexOf(at) == -1 || str.indexOf(at) == 0 || str.indexOf(at) == lstr) {

        alert("Invalid E-mail ID")

        return false

    }

    if (str.indexOf(dot) == -1 || str.indexOf(dot) == 0 || str.indexOf(dot) == lstr) {

        alert("Invalid E-mail ID")

        return false

    }

    if (str.indexOf(at, (lat + 1)) != -1) {

        alert("Invalid E-mail ID")

        return false

    }

    if (str.substring(lat - 1, lat) == dot || str.substring(lat + 1, lat + 2) == dot) {

        alert("Invalid E-mail ID")

        return false

    }

    if (str.indexOf(dot, (lat + 2)) == -1) {

        alert("Invalid E-mail ID")

        return false

    }

    if (str.indexOf(" ") != -1) {

        alert("Invalid E-mail ID")

        return false

    }

}

                  return true                                        

}

2)

function isEmail(argvalue) {

if (argvalue.indexOf(" ") != -1)
    return false;
  else if (argvalue.indexOf("@") == -1)
    return false;
  else if (argvalue.indexOf("@") == 0)
    return false;
  else if (argvalue.indexOf("@") == (argvalue.length-1))
    return false;

// arrayString = argvalue.split("@"); (works only in netscape3 and above.)
  var retSize = customSplit(argvalue, "@", "arrayString");

if (arrayString[1].indexOf(".") == -1)
    return false;
  else if (arrayString[1].indexOf(".") == 0)
    return false;
  else if (arrayString[1].charAt(arrayString[1].length-1) == ".") {
    return false;
  }

return true;

}

Num Check Function

1)

function NumbersOnlyWithEnter(e) {

    var unicode = e.charCode ? e.charCode : e.keyCode

    if (unicode < 48 || unicode > 57) //if not a number

    {

        if (unicode != 13) {

            return false //disable key press

        }

    }

}

2)

function numCheck(argvalue) {

if (argvalue.length == 0)
    return false;

for (var n = 0; n < argvalue.length; n++)
    if (argvalue.substring(n, n+1) < "0" || argvalue.substring(n, n+1) > "9")
      return false;

return true;

}

Eg:

The followings will return "true".
numCheck("1234")
numCheck("0123")

The followings will return "false".
numCheck("abcd")
numCheck("a123")
numCheck("123a")
numCheck("12.3")

Check the URL format is Correct or Not

  

function isURL(argvalue) {

if (argvalue.indexOf(" ") != -1)
    return false;
  else if (argvalue.indexOf("http://") == -1)
    return false;
  else if (argvalue == "http://")
    return false;
  else if (argvalue.indexOf("http://") > 0)
    return false;

argvalue = argvalue.substring(7, argvalue.length);
  if (argvalue.indexOf(".") == -1)
    return false;
  else if (argvalue.indexOf(".") == 0)
    return false;
  else if (argvalue.charAt(argvalue.length - 1) == ".")
    return false;

if (argvalue.indexOf("/") != -1) {
    argvalue = argvalue.substring(0, argvalue.indexOf("/"));
    if (argvalue.charAt(argvalue.length - 1) == ".")
      return false;
  }

if (argvalue.indexOf(":") != -1) {
    if (argvalue.indexOf(":") == (argvalue.length - 1))
      return false;
    else if (argvalue.charAt(argvalue.indexOf(":") + 1) == ".")
      return false;
    argvalue = argvalue.substring(0, argvalue.indexOf(":"));
    if (argvalue.charAt(argvalue.length - 1) == ".")
      return false;
  }

return true;

}