/* The following function creates an XMLHttpRequest object... */ var elementId=""; var loadingMesg=""; function createRequestObject(){ var request_o; //declare the variable to hold the object. var browser = navigator.appName; //find the browser name if(browser == "Microsoft Internet Explorer"){ /* Create the object using MSIE's method */ request_o = new ActiveXObject("Microsoft.XMLHTTP"); }else{ /* Create the object using other browser's method */ request_o = new XMLHttpRequest(); } return request_o; //return the object } var http = createRequestObject(); function getRequest(url,id,msg){ //alert("Inside Getrequest()"); /* Create the request. The first argument to the open function is the method (POST/GET), and the second argument is the url... document contains references to all items on the page We can reference document.form_category_select.select_category_select and we will be referencing the dropdown list. The selectedIndex property will give us the index of the selected item. */ elementId=id; loadingMesg=msg; http.open('get', url); /* Define a function to call once a response has been received. This will be our handleProductCategories function that we define below. */ http.onreadystatechange = ManipulateRequest; /* Send the data. We use something other than null when we are sending using the POST method. */ http.send(null); } function postRequest(url,id,msg){ //alert("Inside Postrequest()"); /* Create the request. The first argument to the open function is the method (POST/GET), and the second argument is the url... document contains references to all items on the page We can reference document.form_category_select.select_category_select and we will be referencing the dropdown list. The selectedIndex property will give us the index of the selected item. */ elementId=id; loadingMesg=msg; http.open('get', url); /* Define a function to call once a response has been received. This will be our handleProductCategories function that we define below. */ http.onreadystatechange = ManipulateRequest; /* Send the data. We use something other than null when we are sending using the POST method. */ http.send(null); } function ManipulateRequest(){ //alert("Inside ManipulateRequest()"); /* Make sure that the transaction has finished. The XMLHttpRequest object has a property called readyState with several states: 0: Uninitialized 1: Loading 2: Loaded 3: Interactive 4: Finished */ //if(loadingMesg=="") var msg="
Please wait...loading
"; if(loadingMesg==""){ //var msg="
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"; var msg = "
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"; } else{ msg=loadingMesg; } if(http.readyState == 1) { //alert('case2'); document.getElementById(elementId).innerHTML=msg; } else if(http.readyState == 4) { //Finished loading the response /* We have got the response from the server-side script, let's see just what it was. using the responseText property of the XMLHttpRequest object. */ //alert('case3'); var response = http.responseText; /* And now we want to change the product_categories
content. we do this using an ability to get/change the content of a page element that we can find: innerHTML. */ //alert(response); document.getElementById(elementId).innerHTML = response; } }