// Script for the Sort By Functionality

function pageFilter(form) {
	//Retrieve form values
	var mainBranch=form.mainbranch.value;
	var controlId=form.control_id.value;
    // the year is supplied as the value of select control
    var subBranch = getControlValueById(controlId);
    if (subBranch != '') {
        gotoPage(mainBranch, subBranch);
    }
     return false;
}

function gotoPage(mainBranch, subBranch) {
    
    // if we're already at the search page, then just stay there - otherwise go for 
    // the search page below the current url.
    var newUrl = location.protocol + '//' +  location.host + '/';
    if (mainBranch != '') {
        newUrl += mainBranch + '/';
    }
    newUrl += subBranch;
    location.href=newUrl;    
}

function getControlValueById(controlId) {
    var control = document.getElementById(controlId);
    return getControlValue(control);
}

function getControlValueByName(controlName, controlTag) {
    var elements = document.getElementsByName(controlName);
    if (elements == null || elements.length == 0) {
        return '';
    }
    if (controlTag == null || controlTag == '') {
        return getControlValue(elements[0]);
    }
    var tagPattern = new RegExp(controlTag, "i");
    for (var i=0; i<elements.length; i++) {
        if (tagPattern.test(elements[i].tagName)) {
            return getControlValue(elements[i]);
        }
    }
    return '';
}

function getControlValue(control) {
    // given a control get it's value.
    if (control == null) {
        return '';
    }
    var controlValue = '';
    
    switch (control.tagName.toLowerCase()) {
        case 'select' :
            if (control.options && control.options.selectedIndex >= 0) {
                controlValue = control.options[control.options.selectedIndex].value;
            }
            break;
            
        case 'input' :
            // need to add code to add different input types.
            controlValue = control.value;
            break;
    }
    
    return controlValue;
}