Why do I have to mess with #Script.Render to include scripts in HTML document - asp.net-mvc

It's been a nightmare to me before I came to know that in order to get jquery ui working in ASP.NET MVC I need to add #Scripts.Render("~/bundles/jqueryui"). Before doing so I kept getting Uncaught error: Undefined is not a function. What I did not understand was why on earth this would happen when I could see the jquery ui file in the sources when inspecting the html source. This is the _Layout.cshtml file:
<!DOCTYPE html>
<html>
<head>
<script src="~/Scripts/jquery-1.8.2.js"></script>
<script src="~/Scripts/jquery-ui-1.8.24.min.js"></script>
<link href="~/Content/themes/base/jquery-ui.css" rel="stylesheet" />
<script src="~/Scripts/jquery.validate.min.js"></script>
<script src="~/Scripts/jquery.validate.unobtrusive.min.js"></script>
<script src="~/Scripts/jquery.plugins.js"></script>
<script src="~/Scripts/Helpers.js"></script>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width" />
<title>#ViewBag.Title</title>
#Styles.Render("~/Content/css")
#Scripts.Render("~/bundles/modernizr")
</head>
<body>
#RenderBody()
#Scripts.Render("~/bundles/jquery")
#Scripts.Render("~/bundles/jqueryui")//Added later to get it working
#RenderSection("scripts", required: false)
</body>
</html>
In my Helper.js file I have some helper functions that I usually use. One of them is applyDatetimePickerAndFormat that is called on $(document).ready(). Inside that function I have the following code:
$('.txt-date').datepicker({
showAnim: "drop",
changeMonth: true,
changeYear: true,
dateFormat: "dd.mm.yy"
});
If I omit #Scripts.Render("~/bundles/jqueryui") in the _Layout.cshtml I will get the aforementioned error. This code works perfectly with any plain html or web form. So it seems that somehow the document can't see the contents of the jquery-ui file. To make my question concrete:
When I look at the Sources of the the web page I can see jquery-ui-1.8.24.js and it's referenced in the html source. Then why can't the code find jquery-ui functions?
If every java script file has to be specified in the #Scripts.Render then why isn't there any problem with my Helper.js file?
And finally where does this ~/bundles/jqueryui path refer to?


jquery-ui depends on jquery (i.e. it must be defined after jquery) but you have duplicated your files. In the head you have included <script src="~/Scripts/jquery-1.8.2.js"></script> followed by jquery-ui. You then reload jquery at the end of the file using #Scripts.Render("~/bundles/jquery") (Its now after jquery-ui).
Delete the script in the head and it should work. I addition, I recommend you delete jquery.validate and jquery.validate.unobtrusive from the head and use #Scripts.Render("~/bundles/jqueryval") at the end of the file (before #RenderSection..). You can examine these bundles in App_Start\BundleConfig.cs file. There are numerous advantages to using bundles (see Bundling and Minification).
If you are using all these files in every page based on _Layout, you can define your own bundle to includes all files.


You need to define the strategy for your js. I recomend you ot organize your js first and after that separate it to smaller parts. One should be common for all the pages(jQuery in your case) and other scripts for validation should be included only on pages that have some editing fileds etc.
Use DRY principle and read some information about how js works. It helps me a lot some time ago and won't take a lot of time.

Related

Mvc: $(...).DataTable is not a function [duplicate]

I am trying to work with jQuery's Datatable JS for my project from this link.
I downloaded the complete library from the same source. All the examples given in the package seem to work fine, but when I try to incorporate them in my WebForms,the CSS,JS do not work at all.
Here is what I have done :
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<link href="css/jquery.dataTables.css" rel="stylesheet" type="text/css" />
</head>
<body>
<form id="form1" runat="server">
<div>
<table id="myTable" class="display" cellspacing="0" width="100%">
<thead>
<tr>
<th>Name</th>
<th>Position</th>
<th>Office</th>
<th>Age</th>
<th>Start date</th>
<th>Salary</th>
</tr>
</thead>
<tfoot>
<tr>
<th>Name</th>
<th>Position</th>
<th>Office</th>
<th>Age</th>
<th>Start date</th>
<th>Salary</th>
</tr>
</tfoot>
<tbody>
<!-- table body -->
</tbody>
</table>
</div>
<script src="js/jquery.dataTables.js" type="text/javascript"></script>
<script src="js/jquery.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function () {
$('#myTable').DataTable();
});
</script>
</form>
</body>
</html>
My file structure for the JS and CSS in my Solution looks as follows :
I have added all the necessary JS and CSS references as shown in the manual. Still the rendering isn't as expected. There is no CSS and even the JS doesn't work.
Also in the console i get the following errors:
ReferenceError: jQuery is not defined
TypeError: $(...).DataTable is not a function
I have still not bound any dynamic data here (like within a repeater or so) still it is not working.
Can someone please guide me in the right direction for this problem ?

CAUSE
There could be multiple reasons for this error.
jQuery DataTables library is missing.
jQuery library is loaded after jQuery DataTables.
Multiple versions of jQuery library is loaded.
SOLUTION
Include only one version of jQuery library version 1.7 or newer before jQuery DataTables.
For example:
<script src="js/jquery.min.js" type="text/javascript"></script>
<script src="js/jquery.dataTables.min.js" type="text/javascript"></script>
See jQuery DataTables: Common JavaScript console errors for more information on this and other common console errors.

This worked for me. But make sure to load the jquery.js before the preferred dataTable.js file. Cheers!
<script type="text/javascript" src="~/Scripts/jquery.js"></script>
<script type="text/javascript" src="~/Scripts/data-table/jquery.dataTables.js"></script>
<script>$(document).ready(function () {
$.noConflict();
var table = $('# your selector').DataTable();
});</script>

I got this error because I found out that I referenced jQuery twice.
The first time: on the master page (_Layout.cshtml) in ASP.NET MVC, and then again on one current page so I commented out the one on the master page.
If you are using ASP.NET MVC this snippet could help you
#*#Scripts.Render("~/bundles/jquery")*#//comment this line
#Scripts.Render("~/bundles/bootstrap")
#RenderSection("scripts", required: false)
and in the current page I added these lines
<script src="~/scripts/jquery-1.10.2.js"></script>
<!-- #region datatables files -->
<link rel="stylesheet" type="text/css" href="//cdn.datatables.net/1.10.12/css/jquery.dataTables.min.css" />
<script src="//cdn.datatables.net/1.10.12/js/jquery.dataTables.min.js"></script>
<!-- #endregion -->
Hope this help you even if don't use ASP.NET MVC

if some reason two versions of jQuery are loaded (which is not recommended), calling $.noConflict(true) from the second version will return the globally scoped jQuery variables to those of the first version.
Sometimes it could be issue with older version (or not stable) of JQuery files
Solution use $.noConflict();
<script src="js/jquery.js" type="text/javascript"></script>
<script src="js/jquery.dataTables.js" type="text/javascript"></script>
<script>
$.noConflict();
jQuery( document ).ready(function( $ ) {
$('#myTable').DataTable();
});
// Code that uses other library's $ can follow here.
</script>

Here is the complete set of JS and CSS required for the export table plugin to work perfectly.
Hope it will save your time
<!--Import jQuery before export.js-->
<script type="text/javascript" src="https://code.jquery.com/jquery-2.1.1.min.js"></script>
<!--Data Table-->
<script type="text/javascript" src=" https://cdn.datatables.net/1.10.13/js/jquery.dataTables.min.js"></script>
<script type="text/javascript" src=" https://cdn.datatables.net/buttons/1.2.4/js/dataTables.buttons.min.js"></script>
<!--Export table buttons-->
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jszip/2.5.0/jszip.min.js"></script>
<script type="text/javascript" src="https://cdn.rawgit.com/bpampuch/pdfmake/0.1.24/build/pdfmake.min.js" ></script>
<script type="text/javascript" src="https://cdn.rawgit.com/bpampuch/pdfmake/0.1.24/build/vfs_fonts.js"></script>
<script type="text/javascript" src="https://cdn.datatables.net/buttons/1.2.4/js/buttons.html5.min.js"></script>
<script type="text/javascript" src="https://cdn.datatables.net/buttons/1.2.1/js/buttons.print.min.js"></script>
<!--Export table button CSS-->
<link rel="stylesheet" href="https://cdn.datatables.net/1.10.13/css/jquery.dataTables.min.css">
<link rel="stylesheet" href="https://cdn.datatables.net/buttons/1.2.4/css/buttons.dataTables.min.css">
javascript to add export buttons on the table with id = tbl
$('#tbl').DataTable({
dom: 'Bfrtip',
buttons: [
'copy', 'csv', 'excel', 'pdf', 'print'
]
});
Result :-

Same error occurs when working with DataTables in a Laravel project. Even if the following solutions are tried, the error still remains:
making sure jQuery is included
include jQuery before including the DataTables
making sure only one version of jQuery is added
In order to remove the error, after making sure the above conditions are fulfilled, add "defer" to the tag which includes the DataTables. For example,
<script src="https://cdn.datatables.net/1.10.23/js/jquery.dataTables.min.js" defer></script>

There can be two reasons for that error:
First
You are loding jQuery.DataTables.js before jquery.js so for that :-
You need to load jQuery.js before you load jQuery.DataTables.js
Second
You are using two versions of jQuery.js on the same page so for that :-
Try to use the higher version and make sure both links have same version of jQuery

I tried many things but my solution was adding "defer" after html script that you included datatables.
<script type="text/javascript" charset="utf8" src="https://cdn.datatables.net/1.10.25/js/jquery.dataTables.js" defer></script>

Honestly, this took hours to get this fixed. Finally only one thing worked a reconfirmation to solution provided by "Basheer AL-MOMANI". Which is just putting statement
#RenderSection("scripts", required: false)
within _Layout.cshtml file after all <script></script> elements and also commenting the jquery script in the same file. Secondly, I had to add
$.noConflict();
within jquery function call at another *.cshtml file as:
$(document).readyfunction () {
$.noConflict();
$("#example1").DataTable();
$('#example2').DataTable({
"paging": true,
"lengthChange": false,
"searching": false,
"ordering": true,
"info": true,
"autoWidth": false,
});
});

I know its late
Buy can help someone
This could also happen if you don't add $('#myTable').DataTable(); inside the document.ready
So instead of this
$('#myTable').DataTable();
Try This
$(document).ready(function() {
$('#myTable').DataTable();
});

I have Added defer to the data table jquery library reference. Now it is working for me.
<script src="~/Scripts/jquery.dataTables.min.js" defer></script>

I ran into this error also. For whatever reason I had originally coded
var table = $('#myTable').DataTable({
"paging": false,
"order": [[ 4, "asc" ]]
});
This would not throw the error sometimes and other times it would. By changing code to
$('#myTable').DataTable({
"paging": false,
"order": [[ 4, "asc" ]]
});
Error appears to have stopped

In my case the solution was to delete cookies from the browser.

Having the same issue in Flask, I had already a template that loaded JQuery, Popper and Bootstrap. I was extending that template into other template that I was using as a base to load the page that had the table.
For some reason in Flask apparently the files in the outer template load before the files in the tables above in the hierarchy (the ones you are extending) so JQuery was loading before the DataTables files causing the issue.
I had to create another template where I run all my imports of JS CDNs in the same place, that solved the issue.

Sometimes it happens that the script (initializing of datatable) is embedded in a general page template, so if one of the pages that actually does not have any table and you did not import the jquery related files for datatable, you face this error, since the general initialization still is looking for that. (This was in my case)
Solution: Is to wrap the initialization of datatable inside a codition that check presence of the library before that:
Here is practical example of it.
if (typeof jQuery.fn.DataTable != "undefined"){
$('#accordionExample table').DataTable( {
"pageLength": 5,
"info": false,
"order": [[ 1, "desc" ]]
} );
}

This may also happen if you write Datatable instead of DataTable. (DataTable T must be capital). this is a beginner's mistake.
$(document).ready(function() {
$('#category-table').DataTable({
// Your Code
});

if you are sure that you aligned your scripts as described above, please make sure you DataTable word case is correct.
Before
$(document).ready(function() {
$('#myTable').Datatable();
});
After
$(document).ready(function() {
$('#myTable').DataTable();
});
small t is creating problem, when I changed this t to T it worked like a charm.

Initialize VSS.SDK from TS class

I need to initialize the VSS.SDK from a .ts class (outside the html page). I have analyzed some examples from Microsoft and all are initialize under html page.Is it possible to do this outside html page?

You can refer to this link for details: Visual Studio Services Web Extension SDK.
Types
Types of VSS.SDK.js, controls and client services are available in typings/vss.d.ts.
REST Client types for VSTS are available in typings/tfs.d.ts
REST Client and extensibility types for Release Management are available in typings/rmo.d.ts
Using tsd
Although TypeScript declare files do not exist at DefinitelyTyped repo, they can still be used through tsd.
First, make sure that the dependencies are loaded using below
command:
tsd install jquery knockout q --save
Next, run below command to get
vss-web-extension-sdk types added to tsd.d.ts:
tsd link
Finally, add only reference to typings/tsd.d.ts in your
TypeScript files.

Yes, you could to do it outside the html and put it in the JavaScript file or other (e.g. ts), then add the reference to corresponding JS file to the html page.
For example:
VSS.init();
$(document).ready(function () {
VSS.notifyLoadSucceeded();
});
<!DOCTYPE html>
<html>
<head>
<title>Hello word</title>
<meta charset="utf-8" />
<script src="node_modules/vss-web-extension-sdk/lib/VSS.SDK.js"></script>
<script src="Scripts/VSSInit.js"></script>
</head>
<body>
<!--<script type="text/javascript">
VSS.init();
</script>-->
<h1>Hello word</h1>
<!--<script type="text/javascript">
VSS.notifyLoadSucceeded();
</script>-->
</body>
</html>

How do I add jquery selectable to a custom jquery ui?

Any object I try to apply the .selectable() I get the following error:
Object doesn't support property or method 'selectable'. Assuming this is happening because the selectable ui feature wasn't downloaded when I made my custom jquery-ui-1.9.2.custom.js script, I opened my jquery-ui-1.9.2.custom.js file and sure enough at the top the selectable feature is not shown
* Includes: jquery.ui.core.js, jquery.ui.widget.js, jquery.ui.mouse.js, jquery.ui.position.js, jquery.ui.draggable.js, jquery.ui.resizable.js, jquery.ui.button.js, jquery.ui.datepicker.js, jquery.ui.dialog.js, jquery.ui.tooltip.js
I downloaded the full jqueryui (1.9.2) package, opened selectable.js and copied the contentents and pasted them into my custom jquery script. I still get the same error. I tried closing/opening Visual Studio and doing a rebuild.
Here is how I'm attempting to apply the selectable UI property.
$("#myList").selectable(); //apply to <ol> object
Here is how I'm loading the script in my page:
<script type="text/javascript" src="Scripts/jquery-1.8.3.js"></script>
<script type="text/javascript" src="Scripts/jquery-ui-1.9.2.custom.js"></script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<link href="Scripts/jquery-ui-1.9.2.custom.css" rel="stylesheet" />
Thank for looking.

JqueryMobile loading external script in body does not solve my ajax navigation issue

I see some others (e.g. this post) have had trouble using external javascript scripts in JQuery Mobile - as of today I have joined their ranks.
I have a single external js script (controllers.js) which contains code that affects several pages on the site. It is loaded on every page of the site. I put the js file just before the tag it works fine on the initial page load. However when I navigate thereafter (using the JQM Ajax methods) all functions in the script stop working. I would have thought the script would remain in cache - but heyho. Anyhow there's an FAQ which answers this question and I've implemented their suggestion which is: "...to reference the same set of stylesheets and scripts in the head of every page." I have done this but when I do even on the first page load the js doesn't fire. There aren't page specific scripts - so the remainder of that FAQ does not apply.
My cut down html looks like this:
<!doctype html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="viewport" content="width=device-width,initial-scale=1.0">
<link rel="stylesheet" href="/static/jquery-ui-1.10.3.custom.min.css">
<link rel="stylesheet" href="/static/jquery-mobile/css/themes/default/jquery.mobile-1.3.2.min.css">
<script src="/static/jquery-1.9.1.min.js"></script>
<script src="/static/jquery-ui/jquery-ui-1.10.3.custom/js/jquery-ui-1.10.3.custom.min.js"></script>
<script src="/static/jquery-mobile/js/jquery.mobile-1.3.2.min.js"></script>
<!-- CSS: implied media="all" -->
</head>
<body>
<div data-role="page" id = "main-page">
<div data-role="header" style="overflow:hidden;">
</div>
<div id = "home" data-role="content">
<input type ='button' id = "some_btn" value="press me">
</div>
</div>
<script type="text/javascript" src="/static/js/controllers.js"></script>
</body>
</html>
and within the javascript file
controllers.js
$('#some_btn').click(function()
{
alert('button pressed');
});
Any ideas on what I may be doing wrong here?

Since the content in the #page is loaded dynamically via ajax, click will not work, since it only works on elements that are on the page when the script is called.
You need to use the .on() method:
$('body').on('click','#some_btn',function()
{
alert('button pressed');
});

how to use dust partial template files (.tl files)

I have few questions on partials and overriding templates.
For that i used the following folder structure.
projectRoot
dust-core-0.6.0.min.js
jquery.js
test.html
partial.tl
main_without_override.tl
The content of partial.tl:
{+greeting} Hola {/greeting}
{+world} World {/world}
The content of main_without_override.tl:
{>partial/}
The content of test.html:
<!DOCTYPE html>
<html>
<head>
<script src="dust-core-0.6.0.min.js" type="text/javascript"></script>
<script src="jq.js" type="text/javascript"></script>
</head>
<body>
</body>
<script>
$.get('main_without_override.tl', function(){
console.log(arguments);
})
</script>
</html>
In the index.html when i try to get the main_without_override.tl its saying 404. But im sure that the file is there. The path that firebug is showing is correct.But browser says 404.
I want to know
How to get this main_without_override.tl
Apply templating for main_without_override.tl and render in the browser.
I searched in google most of the examples give only the syntax. Can somebody help me in rendering the main_without_override.tl template.

In order to compile templates on the client (which is probably not a really good idea), you need to include dust-full instead of dust-core. This is because dust-core does not include the Dust compiler.
The reason that compiling templates on the client is probably not a good idea is that Dust compiles to JavaScript and as #monshi mentioned, you can compile the templates and then serve them as JavaScript. It is possible to get .tl files through AJAX if you include dust-full, but it is a better idea to compile that template beforehand and then make a dynamic request for that .js file when you need.

You can include your dust template as a JavaScript file by using <script> tag, but you need to compile it first, which is explained here
Then add following templates (scripts) to test.html:
<script type="text/javascript" src="partial.js"></script>
<script type="text/javascript" src="main_without_override.js"></script>
And in you JavaScript render the template by dust.render method:
dust.render('main_without_override', your_json_object, function(err, out){
your_dom_element.innerHTML = out;
});
Related question:
how to use dustjs-linkedin as client side templating?

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