Javascript Arithmetic Example Doubt

[shaijuelayidath]

I was refering w3schools Javascript Tutorials,in 'Javascript Arithmetic' section i found a different type of 'var' delcarationactually i did't understand, because it is not refered in the tutorial, the code I given below............................................................................................... <script type="text/javascript">function myFunction(){var y=5;var x=y+2;var demoP=document.getElementById("demo")demoP.innerHTML="x=" + x;}</script>...............................................................................................In the above example i did't understand the below lines, var demoP=document.getElementById("demo")demoP.innerHTML="x=" + x; anyone can define it Thank You

[Don E]

This probably would of been a better idea to post in the JavaScript forum.. What the above is doing is... var y is set to 5.var x is set to y, which is 5 then added 2 to it resulting in x being set to 7.var demoP is set to the element with the id of "demo".demoP.innerHTML = "x = " + x; sets the 'content' of that element to be/display "x = 7". "x = " is a string, then the plus sign/operator concatenates the value of variable x which is 7 resulting in saying "x = 7" So if the element is a div container with an id of "demo", it will look like this basically: <div id="demo">x = 7</div>

[birbal]

first line is calling method getElementByID() od document object which returns a node. which is stored in demoP.innerHTML is attribute of demoP. attributes are accessed by dot operator.

[shaijuelayidath]

Thank you for the replies (DonE, Birbal)after the first line there should be a semi colon ";" is'nt it ?in w3c there is not semi colon after the first 'var' delcarion line, but second line is having, is it required or not for the first line ? var demoP=document.getElementById("demo")demoP.innerHTML="x=" + x; wats your comment...

[birbal]

in Js lines are terminated automatically on new line. so it is not must to terminate expressions explicitly.but it is best practice to terminate expression and should do it.

[shaijuelayidath]

One of your explanation ( " attributes are accessed by dot operator " ) given me new idea and improved my basic knowledge Thank You Birbal