dcsimg

How do I pass some servlet variable to javascript?

Created May 7, 2012

Shirish Bathe

I embedded the javascript code in the servlet such as: 

 
out.println("<scriptlanguage="JavaScript" >");
out.println("<!-- hide from old browser...");
I have an array in servlet that need to be copied to a new array in the javascript, how do I do that? 
-----------------
Normally, the result of servlet is an HTML page, which might contain JavaScript.

So you can not copy contents of servlet variable to javascript variable directly like in following code 

for(int i=0; i<strAlpha.length;i++){
     letterArray[i]=strAlpha[i];
}
Servlets are executed at server while javascript is executed at client browser.

The following code is actually creating javascript code which is then executed at client browser. 

out.print("var letterArray = new Array(");
Boolean isFirst = true;
//Iterator through Array
for (int i=0; i < strAlpha.length; i++){
	if (!isFirst){
		out.print(",");		    <== Semi colon added
	}
	isFirst = false;
	out.print("'" + strAlpha[i] + "'"); <==  Single quote and Semi colon added
}
out.println(");");
If you see HTML source code, you will see following lines : 
var letterArray = new Array('A','B','C','D','E','F','G','H','I');
Shirish