Scripterror when using RequireJS with .NET controls - asp.net

I'm having a bit of an issue with RequireJS.
I have a .NET site with several controls that contains JS code which requires parameters generated by .NET. I've been trying to implement RequireJS into my site, but I ran into a small problem.
I've included the script tag that references RequireJS at the top of the page, as well as reference to main.js within that script tag. Inside my main.js I have the following code;
require.config({
paths: {
'jquery' : '//ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min'
}
});
Then I have a web control that is supposed to display a flash video. This web control contains the following piece of code;
require(['jquery'], function ($) {
if (!eval('<%= FlashAvailable.ToString().ToLowerInvariant() %>')) {
var url = '<%= FallbackImageUrl %>';
if (!url) {
$("#flashcontent").remove();
}
return;
}
var link = '<%= Page.ResolveUrl("~/Templates/AlloyTech/scripts/slideshow.swf") %>';
var width = '<%= Width %>';
var height = '<%= Height %>';
var variables = { xml: '<%= ConfigXml %>' };
var params = { wmode: 'transparent' };
var attributes = { };
swfobject.embedSWF(link, 'flashcontent', width, height, '10', false, variables, params, attributes);
});
This should be working fine right? However, executing the page results in two sets of errors.
1. GET http://episerversite6/scripts/jquery.js 404 (Not Found)
2. Uncaught Error: Script error http://requirejs.org/docs/errors.html#scripterror
Why is it trying to find jquery.js when I've defined the path for jquery is 'http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min'. I've tried adding a second parameter for the path, which is a local fallback jQuery file, and that makes everything work, but I'd still get the first error in my console.
Secondly, why am I getting the scripterror message? I've checked my code several times and I can't seem to find anything wrong with it. Does it have something to do with the code being executed before jQuery has time to load?
So I guess what I'm asking is, what's the best way to use RequireJS with inline scripts? I hope someone can help. Thanks in advance.

It seems I have misunderstood how RequireJS works and the need to rewrite my code accordingly.
So what I decided to do instead is append all ASP.NET generated variables to the elements they're affecting as data-* attributes, and moving all JavaScript codes to individual files which are then referenced in the main.js script that runs on page load. The data-* attribute values are fetched later when the script and its dependencies have been loaded.
So here's what I did to the project I mentioned in my initial question, which is actually an EPiServer CMS demo project called Alloytech.
Flash.ascx
<div id='flashcontent' data-flash-available="<%= FlashAvailable.ToString(CultureInfo.InvariantCulture).ToLowerInvariant() %>"
data-fallback-image="<%= FallbackImageUrl %>"
data-flash-link="<%= Page.ResolveUrl("~/Templates/AlloyTech/scripts/slideshow.swf") %>"
data-flash-width="<%= Width %>"
data-flash-height="<%= Height %>"
data-flash-variables="<%= ConfigXml %>">
<img src='<%= FallbackImageUrl %>' alt='<%= FallbackImageAlt %>' />
</div>
main.js
require.config({
shim: {
'swfobject' : {
exports: 'swfobject'
}
},
paths: {
'jquery': ['http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min', '/Scripts/jquery-1.7.2.min'],
'alloytech': '/templates/alloytech/scripts/alloytech',
'mobile': '/templates/alloytech/scripts/mobile/mobile',
'swfobject': '/Templates/AlloyTech/scripts/swfobject'
}
});
define(['jquery', 'alloytech', 'mobile', 'swfobject'], function ($, A, M, swfobject) {
$.fn.addFlash = function () {
return this.each(function () {
var el = $(this);
var flashAvailable = el.data('flash-available'),
fallbackImage = el.data('fallback-image'),
flashLink = el.data('flash-link'),
flashWidth = el.data('flash-width'),
flashHeight = el.data('flash-height'),
flashVariables = el.data('flash-variables');
if (!eval(flashAvailable)) {
var url = fallbackImage;
if (!url) {
el.remove();
}
return;
}
var link = flashLink;
var width = flashWidth;
var height = flashHeight;
var variables = { xml: flashVariables };
var params = { wmode: 'transparent' };
var attributes = {};
swfobject.embedSWF(link, 'flashcontent', width, height, '10', false, variables, params, attributes);
});
};
$(function () {
$("#flashcontent").addFlash();
});
});
I hope someone else will find this useful.

Its looking for the required module "jquery" before the config paths have loaded. So basically what require.js does it assume that "jquery" is a javascript file and tries to look for it in the same directory as your "data-main" (defined in your HTML header).
I don't know what the solution is for this particular situation as I am fighting the same battle, but this seems to be different to the way that the jquery.js creators intended their plugin to be used judging by the content of this page: Common Errors

Related

jsdom does not fetch scripts on local file system

This is how i construct it:
var fs = require("fs");
var jsdom = require("jsdom");
var htmlSource = fs.readFileSync("./test.html", "utf8");
var doc = jsdom.jsdom(htmlSource, {
features: {
FetchExternalResources : ['script'],
ProcessExternalResources : ['script'],
MutationEvents : '2.0'
},
parsingMode: "auto",
created: function (error, window) {
console.log(window.b); // always undefined
}
});
jsdom.jQueryify(doc.defaultView, 'https://code.jquery.com/jquery-2.1.3.min.js', function() {
console.log( doc.defaultView.b ); // undefined with local jquery in html
});
the html:
<!DOCTYPE HTML>
<html>
<head></head>
<body>
<script src="./js/lib/vendor/jquery.js"></script>
<!-- <script src="http://code.jquery.com/jquery.js"></script> -->
<script type="text/javascript">
var a = $("body"); // script crashes here
var b = "b";
</script>
</body>
</html>
As soon as i replace the jquery path in the html with a http source it works. The local path is perfectly relative to the working dir of the shell / actual node script. To be honest i don't even know why i need jQueryify, but without it the window never has jQuery and even with it, it still needs the http source inside the html document.
You're not telling jsdom where the base of your website lies. It has no idea how to resolve the (relative) path you give it (and tries to resolve from the default about:blank, which just doesn't work). This also the reason why it works with an absolute (http) URL, it doesn't need to know where to resolve from since it's absolute.
You'll need to provide the url option in your initialization to give it the base url (which should look like file:///path/to/your/file).
jQuerify just inserts a script tag with the path you give it - when you get the reference in the html working, you don't need it.
I found out. I'll mark Sebmasters answer as accepted because it solved one of two problems. The other cause was that I didn't properly wait for the load event, thus the code beyond the external scripts wasn't parsed yet.
What i needed to do was after the jsdom() call add a load listener to doc.defaultView.
The reason it worked when using jQuerify was simply because it created enough of a timeout for the embedded script to load.
I had the same issue when full relative path of the jquery library to the jQueryify function. and I solved this problem by providing the full path instead.
const jsdom = require('node-jsdom')
const jqueryPath = __dirname + '/node_modules/jquery/dist/jquery.js'
window = jsdom.jsdom().parentWindow
jsdom.jQueryify(window, jqueryPath, function() {
window.$('body').append('<div class="testing">Hello World, It works')
console.log(window.$('.testing').text())
})

ASP.NET Route config for Backbone Routes with PushState

I have run into an issue recently where we have been told to remove the hash symbols from our Backbone applications. This presents two problems: (a) the ASP.NET routes need to handle any remotely linked URL (currently this is no problem with the hash symbols) so that we're not hitting a 404 error and (b) the proper route needs to be preserved and passed on to the client side (Backbone) application. We're currently using ASP.NET MVC5 and Web API 2 for our backend.
The setup
For an example (and test project), I've created a test project with Backbone - a simple C# ASP.NET MVC5 Web Application. It is pretty simple (here is a copy of the index.cshtml file, please ignore what is commented out as they'll be explained next):
<script type="text/javascript">
$(document).ready(function(event) {
Backbone.history.start({
//pushState: true,
//root: "/Home/Index/"
});
var Route = Backbone.Router.extend({
routes: {
"test/:id": function (event) {
$(".row").html("Hello, " + event);
},
"help": function () {
alert("help!");
}
}
});
var appRouter = new Route();
//appRouter.navigate("/test/sometext", { trigger: true });
//appRouter.navigate("/help", { trigger: true });
});
</script>
<div class="jumbotron">
<h3>Backbone PushState Test</h3>
</div>
<div class="row"></div>
Now, without pushState enabled I have no issue remote linking to this route, ie http://localhost/Home/Index#test/sometext
The result of which is that the div with a class of .row is now "Hello, sometext".
The problem
Enabling pushState will allow us to replace that pesky # in the URL with a /, ie: http://localhost/Home/Index/test/sometext. We can use the Backbone method of router.navigate("url", true); (as well as other methods) to use adjust the URL manually. However, this does not solve the problem of remote linking. So, when trying to access http://localhost/Home/Index/test/sample you just end up with the typical 404.0 error served by IIS. so, I assume that it is handled in in the RouteConfig.cs file - inside, I add a "CatchAll" route:
routes.MapRoute(
name: "CatchAll",
url: "{*clientRoute}",
defaults: new { controller = "Home", action = "Index" }
);
I also uncomment out the pushState and root attributes in the Backbone.history.start(); method:
Backbone.history.start({
pushState: true,
root: "/Home/Index/"
});
var Route = Backbone.Router.extend({
routes: {
"test/:id": function (event) {
$(".row").html("Hello, " + event);
},
"help": function () {
alert("help!");
}
}
});
var appRouter = new Route();
//appRouter.navigate("/test/sometext", { trigger: true });
//appRouter.navigate("/help", { trigger: true });
This allows me to at least let get past the 404.0 page when linking to these routes - which is good. However, none of the routes actually "trigger" when I head to them. After attempting to debug them in Chrome, Firefox, and IE11 I notice that none of the events fire. However, if I manually navigate to them using appRouter.navigate("/help", { trigger: true }); the routes are caught and events fired.
I'm at a loss at this point as to where I should start troubleshooting next. I've placed my Javascript inside of the $(document).ready() event as well as the window.onload event also (as well as not inside of an event); none of these correct the issue. Can anyone offer advice on where to look next?
You simply have to move Backbone.history.start after the "new Route" line.
var Route = Backbone.Router.extend({
routes: {
"test/:id": function (event) {
$(".row").html("Hello, " + event);
},
"help": function () {
alert("help!");
}
}
});
var appRouter = new Route();
Backbone.history.start({
pushState: true,
root: "/Home/Index/"
});
Make sure you go to ".../Home/Index/help". If it doesn't work, try temporarily removing the root and go to ".../help" to see if the root is the problem.
If you still have troubles, set a js breakpoint in Backbone.History.loadUrl on the "return" line. It is called from the final line of History.start to execute the current browser url on page load. "this.matchRoot()" must pass then, "fragment" is matched against each "route" or regexp string in "this.handlers". You can see why or why not the browser url matches the route regexps.
To set to the js breakpoint, press F12 in the browser to open the dev console, press Ctrl-O or Ctrl-P to open a js file, then type the name of the backbone js file. Then search for "loadUrl:". You can also search for "Router =" to find the start of the router class definition (same as for "View =" and "Model =" to find the backbone view/model implementation code). I find it quite useful to look at the backbone code when I have a question like this. It is surprisingly readable and what better place to get answers?
If your js files happen to be minified/compressed, preferably turn this off. Alternately you can try the browser unminify option. In Chrome this is the "{}" button or "pretty print". Then the js code is not all on 1 line and you can set breakpoints. But the function and variable names may still be mangled.
I have solved my own problem using what feels to be "hackish", via the following. If anyone can submit a better response it would be appreciated!
My Solution:
I globally override the default Backbone.Router.intilaize method (it is empty) with the following:
$(document).ready(function (event) {
var _root = "/Home/Index/";
_.extend(Backbone.Router.prototype, {
initialize: function () {
/* check for route & navigate to it */
var pathName = window.location.pathname;
var route = pathName.split(_root)[1];
if (route != undefined && route != "") {
route = "/" + route;
this.navigate("", { trigger: false });
this.navigate(route, { trigger: true });
}
}
});
});

Issue loading Mvc 4 view in Iframe? Not displaying the model properties in IFrame

I have this following requirement. Need to display the html Body of the Mime message in IFrame
View
<iframe id="myIframe1" src="http://localhost:23245/Home/GetMimeMessageContent?FilePath=D \MimeFiles/htmlBody-small1.eml&PartName=HtmlBody" style="width:600px;height:600px;" >
Controller
public ActionResult GetMimeMessageContent(string filePath,string partName)
{
var mimeModel = BuildMimeModel(filePath, partName);
MimeHeaderModel mimeHeadermodel = new MimeHeaderModel();
mimeHeadermodel.FromAddress = mimeHeadermodel.ToAddress = mimeHeadermodel.Subject = string.Empty;
mimeModel.MimeHeader = mimeHeadermodel;
return View("MailDetailsView", mimeModel.MimeBody.HtmlBody);
}
it's not showing the HtmlBody in the Iframe. But Its calling the controller. I dont know what I am missing.
Not sure if your using jquery or not, but:
$(function() {
var $frame = $('<iframe style="width:200px; height:100px;">');
$('body').html( $frame );
setTimeout( function() {
$.ajax(
url="/Home/GetMimeMessageType/small1.eml/HtmlBody",
type:'GET',
success: function(data){
var doc = $frame[0].contentWindow.document;
var $body = $('body',doc);
$body.html(data);
}
);
},1 );
});
I have not tested the above code, but this should work fine. A few things to note:
You will need to create a custom Route to map this to your controller:
http://msdn.microsoft.com/en-us/library/cc668201(v=vs.100).aspx
You will also need to change the javascript $('body').html() to be the ID of a div as a placeholder
also you will notice i have no path, if this never changes, you should add the path to your code or you can use formcollection and change the jquery ajax to a post, and set the variables and values there.
Your content will then up up in an iframe.
Forget the whole html.renderaction, this solution gives you a little more scope

Reading documents CSS in Chrome Extension

I am trying to read the pages CSS using a chrome extension. This is what i have in my content script :
var allSheets = document.styleSheets;
for (var i = 0; i < allSheets.length; ++i) {
var sheet = allSheets[i];
var src = sheet.href;
var rules = sheet.cssRules || sheet.rules;
}
For some reason the rules are always empty. I do get all the CSS files used in the 'src' variable. But the rules always come as null.. Its working when I try it as a separate javascript on a HTML page. But fails when I put it up in the content script of my chrome extension. Can somebody lemme know why?
Well thats the Why, but for fun and interest (never done anything with style sheets before) I thought Id do a How....
manifest.json
{
"name": "Get all css rules in stylesheets",
"content_scripts": [
{
"matches": ["<all_urls>"],
"js" : ["myscript.js"],
"run_at":"document_end"
}
],
"permissions": [
"tabs", "<all_urls>"
],
"version":"1.0"
}
myscript.js
// Create the div we use for communication
var comDiv = document.createElement('div');
comDiv.setAttribute("id", "myCustomEventDiv");
document.body.appendChild(comDiv);
// Utitlity function to insert some js into the page, execute it and then remove it
function exec(fn) {
var script = document.createElement('script');
script.setAttribute("type", "application/javascript");
script.textContent = '(' + fn + ')();';
document.body.appendChild(script); // run the script
document.body.removeChild(script); // clean up
}
// function that gets inserted into the page
// iterates through all style sheets and collects their rules
// then sticks them in the comDiv and dispatchs the event that the content script listens for
getCSS=function (){
var rules = '';
// Create the event that the content script listens for
var customEvent = document.createEvent('Event');
customEvent.initEvent('myCustomEvent', true, true);
var hiddenDiv = document.getElementById('myCustomEventDiv');
var rules ='';
var allSheets = document.styleSheets;
for (var i = 0; i < allSheets.length; ++i) {
var sheet = allSheets[i];
for (var z = 0; z <= sheet.cssRules.length-1; z++) {
rules = rules +'\n'+ sheet.cssRules[z].cssText;
}
}
hiddenDiv.innerText = rules;
hiddenDiv.dispatchEvent(customEvent);
}
// puts the rules back in the page in a style sheet that the content script can iterate through
// youd probably do most of this in the injected script normally and pass your results back through the comDiv....Im just having fun
document.getElementById('myCustomEventDiv').addEventListener('myCustomEvent', function() {
var eventData = document.getElementById('myCustomEventDiv').innerText;
document.getElementById('myCustomEventDiv').innerText='';
var style = document.createElement('style');
style.type = 'text/css';
style.innerText=eventData;
style = document.head.appendChild(style);
var sheet = document.styleSheets[document.styleSheets.length-1];
for (var z = 0; z <= sheet.cssRules.length-1; z++) {
console.log(sheet.cssRules[z].selectorText +' {\n');
for (var y = 0; y <= sheet.cssRules[z].style.length-1; y++) {
console.log(' '+sheet.cssRules[z].style[y] + ' : ' + sheet.cssRules[z].style.getPropertyValue(sheet.cssRules[z].style[y])+';\n');
};
console.log('}\n');
};
// Clean up
document.head.removeChild(style);
document.body.removeChild(document.getElementById('myCustomEventDiv'));
});
exec(getCSS);
In the case of this question Id prolly do most of the checks in the injected script and then pass the results back through the div and its event. But I wanted to see if I could use the dom methods in the content script to go through the css and this was the only way I could figure to do it. I dont like the idea of inserting the rules back into the page, but couldnt figure any other way of doing it.
Just a guess, but since chrome extensions are Javascript based, they may have cross domain issues. Chrome sets the rules and cssRules to null when programmatically trying to get a stylesheet from another domain.
For getting all external css and all internal css file, you can use devtools API. If you want to use it in chrome extension you need to hook devtool into you chrome extension. This code will work
chrome.devtools.panels.create(
'my chrome extension',
'icon.png',
'index.html',
function(panel) {
var initial_resources = {};
// collect our current resources
chrome.devtools.inspectedWindow.getResources(function(resources) {
for (var i = 0, c = resources.length; i < c; i++) {
if (resources[i].type == 'stylesheet') {
// use a self invoking function here to make sure the correct
// instance of `resource` is used in the callback
(function(resource) {
resource.getContent(function(content, encoding) {
initial_resources[resource.url] = content;
});
})(resources[i]);
}
}
});
}
);
Answer is late, but I think I can help. One method of accessing the cssRules of external sheets protected by CORs is to use Yahoo's YQL service. I've incorporated it into a developer tools extension for Chrome for capturing styles and markup for a page fragment. The extension is in the Chrome Web Store and is on Github.
Grab the source from Github and look at the content.js script to see how YQL is used. Basically, you'll make an AJAX call to YQL and it will fetch the CSS for you. You'll need to take the CSS content and either inject it into the page as an embedded style tag or parse the CSS using JavaScript (there are some libraries for that purpose). If you choose to inject them back into the document, make sure to set the new style blocks to disabled so that you don't screw up the rendering of the page.
The extension itself might be useful to you:

jQuery UI with asp.net Master Page

I am updating one of my sites from asp.net with jQuery UI to use master pages.
Here is a snippet of my original code, which works w/out master pages, but not with:
$('#myCancelEventDialog').dialog({
autoOpen: false,
width: 500,
buttons: {
"Cancel This Event": function () { __doPostBack('btnCancel', ''); },
"Do Nothing": function () { $(this).dialog("close"); }
}
});
However, I see what is going on, with the master page chaging the names of the functions, and this code below fixes it for this instance.
$('#myCancelEventDialog').dialog({
autoOpen: false,
width: 500,
buttons: {
"Cancel This Event": function () { __doPostBack('ctl00$ContentPlaceHolder$btnCancel', ''); },
"Do Nothing": function () { $(this).dialog("close"); }
}
});
Notice I have put the 'ctl00$ContentPlaceHolder$' prefix on the btnCancel so that the appropriate callback function is fixed.
From other threads I have read on stackoverflow, there is a better solution than patching up the code one place at a time as I have done above, but haven't quite got it right yet.
What is the general-purpose way to get jQuery UI postback functions to find the right callback function when you are using master pages like in my example above?
A quick fix could be to do the following
$('#myCancelEventDialog').dialog({
autoOpen: false,
width: 500,
buttons: {
"Cancel This Event": function () { __doPostBack("'" + $('[id$=btnvalue]')[0].id + "'", ''); },
"Do Nothing": function () { $(this).dialog("close"); }
}
});
This uses the jQuery endswith selector since the master page now means your control id have prefixes but the ending is the same. This works as long as you dont have duplicate id's dotted around which is what the asp.net team aimed to stop by prefixing nested control id's.
The downside of this is that jQuery has to do more work to find the element as it cannot use the native getElementById.
Another fix would be to upgrade to asp.net 4.0 where you can turn of the prefixing of controls using the clientidmode
You will want to use the ClientID of the control you are after:
__doPostBack('<%= btnCancel.ClientID %>', '');
However, if you use this technique, you will have to enclose your script block inside a div that is exposed to the ASP.Net runtime via the runat attribute.
<div runat="server">
<script type="text/javascript" language="javascript">
//Your Script Here
</script>
</div>
It might be helpful for developers;
http://deepasp.wordpress.com/2013/05/31/jquery-dialog-in-asp-net-master-page/

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