zhky/web/js/ajaxUtils.js

function executeXhr(callback, url) {
    req = false;
    req = createHttpRequest();
    if (req) {
        req.onreadystatechange = callback;
        req.open("GET", url, true);
        req.send(null);
    } else {
		alert("Error initializing XMLHttpRequest!");
	}
}

function createHttpRequest() {
	var httpRequest = false;
	if (window.XMLHttpRequest) { // branch for native XMLHttpRequest object
        httpRequest = new XMLHttpRequest();
    } else if (window.ActiveXObject) { // branch for IE/Windows ActiveX version
        httpRequest = new ActiveXObject("Microsoft.XMLHTTP");
		if (!httpRequest) {
			httpRequest = new ActiveXObject("Msxml2.XMLHTTP");
		}
    }
    return httpRequest;
}


function buildOptions(xmlDoc,id) {
	var selectObj = document.getElementById(id);
	if (!selectObj || selectObj.tagName!="SELECT") {
		return;
	}
	var options = xmlDoc.getElementsByTagName("option");
    //clear select object
    // for (var i = selectObj.length-1 ; i >= 0 ; i--){
    //     selectObj.options[i] = null;
    // }
	selectObj.length = 0;
	for (var i=0; i<options.length; i++) {
		var len = selectObj.length;
		selectObj.length = len + 1;
		selectObj.options[len].value = options[i].attributes[0].nodeValue;
		selectObj.options[len].text = options[i].attributes[1].nodeValue;
		if (options[i].attributes[2].nodeValue =="selected") {
			selectObj.options[len].selected = true;
		}
	}
}