Crydust/getQueryStringParam.html

## getQueryStringParam.html
<!doctype html>
<html>
<head>
<script src="jquery-1.4.js"></script>
<script>
/**
 * @return null if param not found
 * @return string if param found once
 * @return array if param found more than once or name ends with "[]"
 */
function getQueryStringParam(name) {
    var result = null;
    if (window.location.search !== '') {
        var querystring = window.location.search.substring(1).replace(/\+/g, ' ');
        var pairs = querystring.split('&');
        var isFound = false;
        for (var i = 0; i < pairs.length; i += 1) {
            var pair = pairs[i].split('=');
            var key = decodeURIComponent(pair[0]);
            if (key === name) {
                var val = (pair.length === 2 ? decodeURIComponent(pair[1]) : key);
                if (!isFound) {
                    isFound = true;
                    result = [val];
                } else {
                    result.push(val);
                }
            }
        }
        if (isFound && result.length === 1 && !/\[[0-9]*\]$/.test(name)) {
            result = result[0];
        }
    }
    return result;
}
/**
 * helper function
 */
function printQueryStringParam (name) {
    var result = "";
    var val = getQueryStringParam(name);
    if (val === null) {
        result = "null";
    }
    else if (jQuery.isArray(val)) {
        result = "[\n\t" + val.join(",\n\t") + "\n]";
    }
    else {
        result = val;
    }
    return result;
}
</script>
</head>
<body>

<form action="test.html" method="get">
<p>
text <input type="text" name="text"
value="space: , plus:+, slash:/, backslash:\, amp:&amp;, equals:=, less:<, greater:>"><br>
</p>
<p>
checkbox[]<br>
<input type="checkbox" name="checkbox[]" value="a" checked> a<br>
<input type="checkbox" name="checkbox[]" value="b" checked> b<br>
</p>
<p>
<input type="submit">
</p>
</form>

<hr>

<pre>
<script>
document.write("text: "+printQueryStringParam("text"));
document.write("\ncheckbox[]: "+printQueryStringParam("checkbox[]"));
</script>
</pre>

</body>
</html>
	<!doctype html>
	<html>
	<head>
	<script src="jquery-1.4.js"></script>
	<script>
	/**
	* @return null if param not found
	* @return string if param found once
	* @return array if param found more than once or name ends with "[]"
	*/
	function getQueryStringParam(name) {
	var result = null;
	if (window.location.search !== '') {
	var querystring = window.location.search.substring(1).replace(/\+/g, ' ');
	var pairs = querystring.split('&');
	var isFound = false;
	for (var i = 0; i < pairs.length; i += 1) {
	var pair = pairs[i].split('=');
	var key = decodeURIComponent(pair[0]);
	if (key === name) {
	var val = (pair.length === 2 ? decodeURIComponent(pair[1]) : key);
	if (!isFound) {
	isFound = true;
	result = [val];
	} else {
	result.push(val);
	}
	}
	}
	if (isFound && result.length === 1 && !/\[[0-9]*\]$/.test(name)) {
	result = result[0];
	}
	}
	return result;
	}
	/**
	* helper function
	*/
	function printQueryStringParam (name) {
	var result = "";
	var val = getQueryStringParam(name);
	if (val === null) {
	result = "null";
	}
	else if (jQuery.isArray(val)) {
	result = "[\n\t" + val.join(",\n\t") + "\n]";
	}
	else {
	result = val;
	}
	return result;
	}
	</script>
	</head>
	<body>

	<form action="test.html" method="get">
	<p>
	text <input type="text" name="text"
	value="space: , plus:+, slash:/, backslash:\, amp:&, equals:=, less:<, greater:>"><br>
	</p>
	<p>
	checkbox[]<br>
	<input type="checkbox" name="checkbox[]" value="a" checked> a<br>
	<input type="checkbox" name="checkbox[]" value="b" checked> b<br>
	</p>
	<p>
	<input type="submit">
	</p>
	</form>

	<hr>

	<pre>
	<script>
	document.write("text: "+printQueryStringParam("text"));
	document.write("\ncheckbox[]: "+printQueryStringParam("checkbox[]"));
	</script>
	</pre>

	</body>
	</html>