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  • How to use getElementById() method in javascript

    @rajshekhar.tiwari
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    In the example given below document.getElementById returns a reference to our HTML element myText. We store this reference into a variable 'myTextField', and then use the 'value' property, that all input elements use to grab the value.

    1. <script type="text/javascript">
    2. function checkValue(){
    3.         var myTextField = document.getElementById('myText');
    4.         if(myTextField.value != "")
    5.                 alert("You entered: " + myTextField.value)
    6.         else
    7.                 alert("Would you please enter your age?")              
    8. }
    9. </script>
    10. <input type='text' id='myText' />
    11. <input type='button' onclick='checkValue()' value='check age' />
    Javascript html
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