webform.js

一个用struts tiles的在线影院web系统

// JavaScript source code
// Global callback object. It seems that this cannot process simultaneous Async callbacks.

var __callbackObject = new Object();

/*
 * The request page must return the body start with char 's' if successed.
 */
function webform_doRequest(url, eventCallback, context, errorCallback, useAsync) {

	 // For non MS browsers, we can use the "XMLHttpRequest" object.
	if (__nonMSDOMBrowser) {
		var xmlRequest = new XMLHttpRequest();
		if (url.indexOf("?") != -1) {
			xmlRequest.open("GET", url + "&" + postData, false);
		} else {
			xmlRequest.open("GET", url + "?" + postData, false);
		}

		xmlRequest.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
		xmlRequest.send(null);

		response = xmlRequest.responseText;
		if (response.charAt(0) == "s") {
			if (eventCallback != null) {
				eventCallback(response.substring(1), context);
			}
		} else {
			if (errorCallback != null) {
				errorCallback(response.substring(1), context);
			}
		}
	}
	
	// For IE, we use XMLHTTP.
	else {
		var xmlRequest = new ActiveXObject("Microsoft.XMLHTTP");

		// Hook the readystatechange event.
		xmlRequest.onreadystatechange = webform_callbackComplete;

		__callbackObject.xmlRequest = xmlRequest;
		__callbackObject.eventCallback = eventCallback;
		__callbackObject.context = context;
		__callbackObject.errorCallback = errorCallback;

		var usePost = false;

		// POST or use URL query string?
		var postData = "";
		if (url.length + 1 > 2067) {
			var dataStart = url.indexOf("?");
			if (dataStart >= 0) {
				postData = url.substring(dataStart+1);
				url = url.substring(0, dataStart);
				usePost = true;
			}
		}

		if (usePost) {
			xmlRequest.open("POST", url, useAsync);
			xmlRequest.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
			xmlRequest.send(postData);
		} else {
			if (url.indexOf("?") != -1) {
				xmlRequest.open("GET", url + "&" + postData, useAsync);
			} else {
				xmlRequest.open("GET", url + "?" + postData, useAsync);
			}

			xmlRequest.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
			xmlRequest.send();
		}
	}
}

function webform_callbackComplete() {
	if (__callbackObject.xmlRequest.readyState == 4) {
		response = __callbackObject.xmlRequest.responseText;

		// Success or Exception from the server side?
		if (response.charAt(0) == "s") {
			if (__callbackObject.eventCallback != null) {

				  // Invoke the client side callback function to manipulate DOM.
				__callbackObject.eventCallback(response.substring(1), __callbackObject.context);
			}
		} else {
			if (__callbackObject.errorCallback != null) {
				__callbackObject.errorCallback(response.substring(1), __callbackObject.context);
			}
		}
	}
}

function webform_doCallback(eventTarget, eventArgument, eventCallback, context, errorCallback, useAsync) {
	var re = new RegExp("\\x2B", "g");
	var postData = __theFormPostData +
		"__CALLBACKID=" + eventTarget +
		"&__CALLBACKPARAM=" + escape(eventArgument).replace(re, "%2B");

	webform_doRequest(pageUrl, eventCallback, context, errorCallback, useAsync);
}

var __nonMSDOMBrowser = (window.navigator.appName.toLowerCase().indexOf('explorer') == -1);
var __theFormPostData = "";
var theForm = document.forms[0];
var pageUrl = "";

function webform_initCallback() {
	var count = theForm.elements.length;
	var element;
	var re = new RegExp("\\x2B", "g");

	// Prepare the FORM data we will send to the server.
	for (i = 0; i < count; i++) {
		element = theForm.elements[i];
		if (element.tagName.toLowerCase() == "input") {
			__theFormPostData += element.name + "=" + element.value.replace(re, "%2B") + "&";
		} else if (element.tagName.toLowerCase() == "select") {
			selectCount = element.children.length;

			for (j = 0; j < selectCount; j++) {
				selectChild = element.children[j];

				if ((selectChild.tagName.toLowerCase() == "option") && (selectChild.selected == true)) {
					__theFormPostData += element.name + "=" + selectChild.value.replace(re, "%2B") + "&";
				}
			}
		 }
	}
}