Slow ajax for simple DB access - javascript

While testing out setInterval(), i had a slow load time for an ajax request. It was very simple and other pages with much more complex requests were terminating in less than a second while this very simple one is terminating after 10-12. Without using setInterval() it is still taking this long and it uses the same layout as the other pages.
Example of script:
document.getElementById("test").innerHTML = "Starting";
if(window.XMLHttpRequest)
{
xmlhttp = new XMLHttpRequest();
}
else
{
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange = function()
{
if(xmlhttp.readyState == 4 && xmlhttp.status == 200)
{
document.getElementById("test").innerHTML = xmlhttp.responseText;
}
}
xmlhttp.open("GET", "/TestLive.cshtml", true);
xmlhttp.send();
Slow server page (ASP.NET):
Response.Expires = -1;
var db = Database.Open("mydb");
string query = "select Name from Game where ID='97';";
Response.Write(db.QuerySingle(query).Name);
Example of fast:
Response.Expires = -1;
string query = "select * from Season where Season.Game = 'Football' and Season.End > '" + DateTime.Now.Add(new TimeSpan(-8,0,0)).ToString("yyyy-MM-dd") + "';";
var db = Database.Open("mydb");
var result = db.Query(query);
Response.Write("<select id=\"chosenSeason\" onchange=\"setDraftSeason()\">");
Response.Write("<option selected=\"selected\">Choose a Season</option>");
foreach (var season in result)
{
Response.Write("<option value=\"" + season.ID + "\">");
Response.Write(season.Name);
Response.Write(" (" + season.Start.ToString("dd-MM-yyyy") + " - " + season.End.ToString("dd-MM-yyyy") + ")");
Response.Write("</option\">");
}
Response.Write("</select>");
EDIT: It seems to be related to using the layout page to access the script. all of the fast pages use the same setup though.

Related

2 XMLHTTPRequests in one Javascript (Dynamics CRM)

I am currently trying to run 2 separate XMLHTTPRequests in dynamics CRM Javascript to retrieve data from 2 different entities and run code depending on what is retrieved..
I've done my best to try and edit some names for security reasons, but the premise is the same.
My main problem is that the first run of the XMLHTTPRequest (the RA Banner) works fine, but then the second run (the Status Banner) the Readystate that is returned is 2 and stopping.
function FormBanners(formContext) {
//Clear the existing banners
formContext.ui.clearFormNotification("Notif1");
formContext.ui.clearFormNotification("Notif2");
//Get the customer/rep
var customer = formContext.getAttribute("customerid").getValue();
var rep = formContext.getAttribute("representative").getValue();
var contact;
//use the rep if there is one else use the customer
if (rep != null) {
contact = rep;
}
else if (customer!= null) {
contact = customer;
}
//Get the account
var account = formContext.getAttribute("accountfield").getValue();
//As there is a requirement for 2 XMLHTTPRequests we have to queue them
var requestURLs = new Array();
//There will always be a customers or rep on the form
requestURLs.push(Xrm.Page.context.getClientUrl() + "/api/data/v9.1/contacts?$select=new_RA,new_SC,new_VC,new_PR&$filter=contactid eq " + contact[0].id + "", true);
//there may not be an account
if (account) {
requestURLs.push(Xrm.Page.context.getClientUrl() + "/api/data/v9.1/accounts?$select=_new_statusLookup_value&$filter=accountid eq " + account[0].id + "", true);
}
var current = 0;
function getURL(url) {
var req = new XMLHttpRequest();
req.open("GET", requestURLs[current]);
req.setRequestHeader("OData-MaxVersion", "4.0");
req.setRequestHeader("OData-Version", "4.0");
req.setRequestHeader("Accept", "application/json");
req.setRequestHeader("Content-Type", "application/json; charset=utf-8");
req.setRequestHeader("Prefer", "odata.include-annotations=\"*\"");
req.onreadystatechange = function () {
if (this.readyState === 4) {
req.onreadystatechange = null;
if (this.status === 200) {
var result = JSON.parse(req.response);
// Creation of the RA Banner
if (current == 0) {
var RA = result.value[0]["new_RA#OData.Community.Display.V1.FormattedValue"];
var SC = result.value[0]["new_SC#OData.Community.Display.V1.FormattedValue"];
var VC = result.value[0]["new_VC#OData.Community.Display.V1.FormattedValue"];
var PR = result.value[0]["new_PR#OData.Community.Display.V1.FormattedValue"];
var Notif = "";
//Only create a notification if any of the above contain "Yes"
if (RA == "Yes" || SC == "Yes" || VC == "Yes" || PR == "Yes") { Notif = "The Customer/Rep has:" }
if (RA == "Yes") { Notif = Notif + " RA,"; }
if (SC == "Yes") { Notif = Notif + " SC,"}
if (VC == "Yes") { Notif = Notif + " VC,"}
if (PR == "Yes") { Notif = Notif + " PR."}
if (Notif != "") {
formContext.ui.setFormNotification(Notif, "INFO", "Notif1");
}
}
//Creation of the Status Banner
else if (current == 1) {
status = results.value[i]["_new_statusLookup_value"];
if (status) {
if (status[0].name != "Open")
var Notif = "The status for the organisation on this case is " + status[0].name + ".";
formContext.ui.setFormNotification(Notif, "INFO", "Notif2");
}
}
++current;
if (current < requestURLs.length) {
getURL(requestURLs[current]);
}
} else {
Xrm.Utility.alertDialog(req.statusText);
}
}
}; req.send();
}
getURL(requestURLs[current]);
}
Can anyone help me out?
So in my example I had made many mistakes. Taking Arun's advice I separated the function out, which made debugging far easier.. it instead was not failing on the XMLHTTP Request because that worked fine, but firefox was crashing when debugging.
So my issues were that I was in the second part:
Used the value of i for results (i was no longer defined)
Getting the "_new_statusLookup_value" would only provide the guid of the lookup I would instead want "_new_statusLookup_value#OData.Community.Display.V1.FormattedValue"
Lets not ignore the fact that because I had copied and pasted many iterations of this code that I was also using "results" instead of "result".
Many little mistakes.. but it happens! Thanks for the help, just goes to show.. typos are our downfall!

JSON Parse Javascript Issues

I am using the following to load a local txt file to convert it, the code is directly from W3c schools but the page loads nothing on screen and I have no errors on page or in the inspector. It wont work on MAMP or webserver. I am trying to learn vanilla JS so I don't want to use a library or jquery.
<div id="id01"></div>
<script>
var xmlhttp = new XMLHttpRequest();
var url = "array.txt";
xmlhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
var myArr = JSON.parse(this.responseText);
myFunction(myArr);
}
};
xmlhttp.open("GET", url, true);
xmlhttp.send();
function myFunction(arr) {
var out = "";
var i;
for (i = 0; i < arr.length; i++) {
out += '<a href="' + arr[i].url + '">' +
arr[i].display + '</a><br>';
}
document.getElementById("id01").innerHTML = out;
}
</script>
Thanks for your help everyone, the issue was a clash with another function running on the page and the lack of 200 response from the local file.

Only one JavaScript function loading on page load.

I have a webpage with a few JavaScript functions set to load on document.ready.
However, if I have 4 of these, only the final one seems to load.
Here is the code I have.
$(document).ready(function ()
{
var nation = "ireland";
var irelandMatches = [];
var matchOrderReversed = false;
loadDoc();
showRSS("Irish Times");
loadWeather();
loadTwitter();
The loadDoc() and loadTwitter() methods load, but weather and showRSS do not. If I comment out loadTwitter(), then the weather loads fine.
If it makes any difference, all of these methods make use of an XMLHttpRequest, each of which is defined within each method, like so.
function loadYouTube()
{
var html = "";
if (window.XMLHttpRequest)
{
// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp = new XMLHttpRequest();
}
else
{ // code for IE6, IE5
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange = function ()
{
if (xmlhttp.readyState == 4 && xmlhttp.status == 200)
{
var ret = xmlhttp.responseText;
var spl1 = ret.split("~");
for (i = 0; i <= 10; i++)
{
var spl2 = spl1[i].split("*");
var current = "<a href='" + spl2[1] + "'><img src='" + spl2[2] + "' width='50' height='50'>" + "<a href='" + spl2[1] + "'>" + spl2[0] + "</a> <br/>";
html += current;
}
$("#yt").html(html);
}
}
xmlhttp.open("GET", "getyoutube.php?", true);
xmlhttp.send();
}
Thanks guys :)
It looks like when you define xmlhttp in your loadYouTube() example, you are doing so on the global scope due to the lack of var. So loadDoc() sets window.xmlhttp, then loadWeather() overwrites it shortly after, followed by loadTwitter().
Try something like this in your loading functions:
function loadYouTube()
{
var html = "";
// define xmlhttp in block scope
var xmlhttp;
// rest of function...
}

Chrome Extension - multiple asynchrone XMLhttpRequests

The idea is to start multiple xmlhttp requests in an loop and let them store their result in a global variable.
for (var i = 0; i < something; i++) {
fetch_site(url, i);
}
Now the function fetch_site() looks like this:
// the result will be palced at the i-th field in the "content"-array
function fetch_site(url, i) {
var xmlhttp = new XMLHttpRequest();
xmlhttp.open("GET", url, true);
// Milliseconds a request can take before automatically being terminated
xmlhttp.timeout = 500;
xmlhttp.ontimeout = function () {
content[i] = "none";
console.log("ontimeout: content[" + i + "] is now set to " + content[i] );
};
// On error
xmlhttp.onerror = function () {
content[i] = "none";
console.log("onerror: content[" + i + "] is now set to " + content[i] );
};
// On success
xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState == 4) {
if (xmlhttp.status == 200) {
content[i] = xmlhttp.responseText;
// Deleting unneccessary spaces
content[i] = content[i].trim();
} else content[i] = "none";
}
};
//xmlhttp.setRequestHeader("Content-type","Lookup/simple");
xmlhttp.send();
}
I can confirm that each an every request gets send. However google-chrome marks them as pending and when diggin deeper it defines them as stalled.
By the way, this code is used in a chrome extension. Hence it might be a permission problem. Though I would not expect it to be one as I have granted my extension to fetch every site.
The corresponding manifest-file includes the following lines:
"permissions": [
"storage",
"http://*/",
"https://*/"
],

Javascript does not recognise dynamic div content

I have a script i have been battling with now for like a week.
I have a page which has a div with id ("content"). Now I loaded some content, a form contained in a div tag to be specific, into this div VIA Ajax, and it is displaying fine
Now, the challenge is - When the form is submitted, Im am calling a function that will disable all the field on the element in that div tag. I always get the error "undefined".
It seems that the div, that i brought in to the page isn't recognized by javascript..
I have searched google, bing, yahoo..i just havent found the solution yet...
Please, what do I do??
I have included the code below --
+++++++++
The code below for my external javascript file
++++++++++++++++++++
// JavaScript Document
var doc = document;
var tDiv;
var xmlHttp;
var pgTitle;
function getXMLObj(){
if (window.XMLHttpRequest){
// code for IE7+, Firefox, Chrome, Opera, Safari
Obj = new XMLHttpRequest();
}
else if (window.ActiveXObject){
// code for IE6, IE5
Obj = new ActiveXObject("Microsoft.XMLHTTP");
}
else{
alert("Your browser does not support Ajax!");
}
return Obj;
}
function loadCont(toLoad, view){
doc.getElementById('loadBlank').innerHTML = '<div id="loading">Processing Request...</div>';
var url;
switch(toLoad){
case 'CI':
pgTitle = "Administration - Company Information";
url = "comp_info.php?v=" + view + "&sid=" + Math.random();
break;
case 'JB':
pgTitle = "Administration - Jobs";
url = "jobs.php?v=" + view + "&sid=" + Math.random();
break;
case 'US':
pgTitle = "Administration - Users";
url = "users.php?v=" + view + "&sid=" + Math.random();
break;
case 'EP':
pgTitle = "Administration - Employees";
url = "emp.php?v=" + view + "&sid=" + Math.random();
break;
case 'AP':
pgTitle = "Administration - Recruitments";
url = "applicants.php?v=" + view + "&sid=" + Math.random();
break;
case 'JV':
pgTitle = "Administration - Recruitments";
url = "jobvacancy.php?v=" + view + "&sid=" + Math.random();
break;
}
xmlHttp = getXMLObj();
if (xmlHttp !== null && xmlHttp !== undefined){
xmlHttp.onreadystatechange = loadingContent;
xmlHttp.open('GET', url, true);
xmlHttp.send(null);
}
}
function loadingContent(){
if (xmlHttp.readyState == 4 || xmlHttp.readyState == 'complete'){
//Show the loading and the title, but hide the content...
if (xmlHttp.status == 200){
doc.getElementById('dMainContent').innerHTML = parseScript(xmlHttp.responseText);
doc.getElementById('loadBlank').innerHTML = '';
}
else{
doc.getElementById('dMainContent').innerHTML = 'Sorry..Page not available at this time. <br />Please try again later';
doc.getElementById('loadBlank').innerHTML = '';
}
}
if (xmlHttp.readyState < 4){
//Show the loading and the title, but hide the content...
doc.getElementById('ActTitle').innerHTML = pgTitle;
doc.getElementById('dMainContent').innerHTML = '';
}
}
function valCompInfo(){
//First Disable All the elements..
alert('I was hree');
DisEnaAll('CompForm');
//Now..lets validate the entries..
}
function DisEnaAll(contId){
//alert(doc.getElementById(contId).elements);
var theId = doc.getElementById(contId).elements;
try{
var numElems = theId.length;
for (var i=0; i < (numElems - 1); i++){
(theId[i].disabled == false) ? (theId[i].disabled = true) : (theId[i].disabled = false);
}
}
catch(e){
var msg = "The following error occurred: \n\n";
msg += e.description
alert(msg);
}
}
// http://www.webdeveloper.com/forum/showthread.php?t=138830
function parseScript(_source) {
var source = _source;
var scripts = new Array();
// Strip out tags
while(source.indexOf("<script") > -1 || source.indexOf("</script") > -1) {
var s = source.indexOf("<script");
var s_e = source.indexOf(">", s);
var e = source.indexOf("</script", s);
var e_e = source.indexOf(">", e);
// Add to scripts array
scripts.push(source.substring(s_e+1, e));
// Strip from source
source = source.substring(0, s) + source.substring(e_e+1);
}
// Loop through every script collected and eval it
for(var i=0; i<scripts.length; i++) {
try {
eval(scripts[i]);
}
catch(ex) {
// do what you want here when a script fails
}
}
// Return the cleaned source
return source;
}
This code is on the main page where the javascript is
<div id="dMainContent">
</div>
</body>
</html>
And finally, the content of the page i am loading via ajax..
<div style="width:738px" id="CompForm">
<div class="tdright">
<?php echo $btnNm; ?>
</div>
</div>
That's the code..
Thanks
The issue is with div tag (id "CompForm") which is not a HTML form.
"elements" is a collection of the form element not div element. So when trying to access div.elements the property is undefined.
See MSDN, form.elements is part of DOM level 1 (according to MSDN)
http://msdn.microsoft.com/en-us/library/ms537449%28v=VS.85%29.aspx
Add your Javascript functions or external JS file to the original page.
this is not JavaScript....
doc.getElementById(contId).elements
but is used in your JavaScript... you will definitely not get anything. (null)
I don't think this is valid either:
theId[i].disabled == false
EDIT: Note per comments: this is NOT the answer :) See comments for details of why.
Left as an answer simply as a learning aid aid as suggested.
Shouldn't
xmlHttp.onreadystatechange = loadingContent;
be
xmlHttp.onreadystatechange = loadingContent();
or
loadingContent();
and that function should return a value if you want to assign it like that...

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