Using JavaScript to get the Query_String from a frameset (Page 3)

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Using JavaScript to get the Query_String from a frameset (continued)

Here is how you can get a parameter using the above function:


var productNameLink = getParameter ( framesetQuery, 'productname' );

In my application, I put the code above in the JS Header. Later on, when I am actually assigning the value to a field, I reference this parameter in the onLoad event.

One key thing to remember here is that JavaScript is case-sensitive. Therefore, whenever I'm working with things like parameter names or frame names, I usually always try to make them all lower case in order to eliminate case-related problems.

Manipulating the result
Once you've gotten the value of a parameter from the Query_String you might need to manipulate it. For instance, in order to pass values containing spaces, you have to put plus signs where the spaces were so they will work in the URL. On my form, I've got two variables. The first is productNameLink. It is exactly equal to the parameter value, including plus signs. The second variable is called productName, and it's computed using the "replaceSubstring" JavaScript function below (which you should place in the JS Header section of your form) to replace the plus signs with spaces once again. As you'll see in the final section, when I'm writing code back to the browser, I'll need to use both of these variables.


function replaceSubstring ( inputString, badString, goodString, caseSensitive ) {

fixedReplace = " ";

UI = inputString;

UB = badString;

if ((caseSensitive !=1) && (caseSensitive != true)) {

UI = inputString.toUpperCase();

	UB = badString.toUpperCase();

	}

badEnd = -1;

badLoc = UI.indexOf(UB);

if (badLoc != -1) {

	for (x=1; (badLoc != -1); x++) {

		fixedReplace = fixedReplace + inputString.substring((badEnd + 1), badLoc) + goodString

			badEnd = badLoc + UB.length - 1;

			badLoc = UI.indexOf(UB, (badLoc + 1)); }

	fixedReplace = fixedReplace + inputString.substring((badEnd + 1), inputString.length); }

	else { fixedReplace = inputString; }

return fixedReplace;

}

You can then manipulate the value of the parameter in the JS Header with the following code:


var productName = replaceSubstring ( productNameLink, "+", " ", false);

Notice how I used the productNameLink variable I had already computed above and simply replaced the plus signs with spaces.

But wait, there's more! As a special bonus, I'm also going to include a JavaScript "trim" function that will help you to remove any extraneous leading or following spaces that you might have in a string:


function trim ( inputStringTrim ) {

fixedTrim = "";

lastCh = " ";

for (x=0; x < inputStringTrim.length; x++) {

	ch = inputStringTrim.charAt(x);

	if ((ch != " ") || (lastCh != " ")) { fixedTrim += ch; }

	lastCh = ch;

}

	if (fixedTrim.charAt(fixedTrim.length - 1) == " ") {

		fixedTrim = fixedTrim.substring(0, fixedTrim.length - 1); }

	return fixedTrim

}