JavaScript Explanation Required for the Following Code !!!

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Dear Friends,
I found this JavaScript function on a Example of my friend.
Can someone plz explain me this function in details ?

JavaScript

function callPrint(elementId) {
                var prtContent = document.getElementById(elementId);
                var WinPrint = window.open('', '', 'left=0,top=0,width=1000,height=600,toolbar=2,scrollbars=2,status=0');
                var docColor = "Black";
                var strInnerHTML = prtContent.innerHTML;
                var strModifiedInnerHTMl = strInnerHTML.replace(/white/g, docColor);
                WinPrint.document.write(strModifiedInnerHTMl);
                WinPrint.document.close();
                WinPrint.focus();
                WinPrint.print();
                WinPrint.close();
            }

I need Explanation from 3rd line Onward.

Thanks For Helping.

Posted 3-Oct-12 6:05am

P_Dash

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fjdiewornncalwe · Accepted Answer · 2012-10-03T06:24:00

JavaScript

var docColor = "Black"

Create a variable named docColor and set its value to the string "Black"

JavaScript

var strInnerHTML = prtContent.innerHTML;

Create a variable named strInnerHTML and set its value to the innerHTML value of the prtContent page element.

JavaScript

var strModifiedInnerHTMl = strInnerHTML.replace(/white/g, docColor);

Create a variable named strModifiedInnerHTML and set its value to a modified copy of strInnerHTML where any instances of "white" have been replaced by the current value of docColor(Which is currently "Black"). This is being done with a regular expression /white/ with a g switch indicating that it will update all instances that it finds.

JavaScript

WinPrint.document.write(strModifiedInnerHTMl);

Writes the strModifiedInnerHTML string to a WinPrint document object.

JavaScript

WinPrint.document.close();

Closes the WinPrint document

JavaScript

WinPrint.focus();

Gives the WinPrint object focus

JavaScript

WinPrint.print();

Sends the Winprint object to the printer

JavaScript

WinPrint.close();

Closes/Finished the WinPrint object. More than likely this call is required to clean up resources that the WinPrint object required to perform its actions.