HOW TO CHECK TEXT BOX DATA VALUE IS BLANK OR NOT &&& EXCEPT NUMERICAL DATA VALUE:

 HOW TO CHECK TEXT BOX DATA VALUE IS BLANK OR NOT:-


- check the blank data value usmei "" or null bhi chalta hai. 

<html>

<head>

<script language="JavaScript">

  

  function display()

  {

  var name;

  name=document.getElementById("T1").value;

  if (name=="")

    {

    alert("please input proper data");


    }

  else

    {

    alert("your data is valid");

    }


  }


</script>

</head>

<body>

<input  type="text" id="T1">

<br>

<button onclick="display()"> submit </button>

</body>

</html>


-------------------------------------


EXCEPT NUMERICAL DATA VALUE:-


<html>

<head>

<script language="JavaScript">


  function input()

  {

  var num;

  num=document.getElementById("T1").value;

 

    if(isNaN(num))

    {

    alert("please accept only number");

    }

    else 

    {

    alert(num);

    }

  }

</script>

</head>

<body>

<input type="text" id="T1">

<br>

<button onclick="input()"> submit </button>

</body>

</html>


- jab bhi hum num use krte hai to"num" nhi lagate only num 


screen text including following concept:-

1- function 

2- condition statement(if else elseif)

3- control text box

4- basic html

5- gateElementById

6- check the blank data value

7- logical expression 


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