If you dynamically add controls with ajax, javascript doesn’t see those controls unless you hang the method on the document.body like this:
$(document.body).on(‘keyup change blur’,
‘.dateTaken’,
function (event) {
enableOrDisableSaveButton();
});
This watches keyup, change, and blur on an element that has the class dateTaken.
@Html.DropDownListFor(m => m.SelectedValue,
new SelectList(Model.CollectionOfItemsForDropdown, "ValueField", "NameField"),
@Model.CollectionOfItemsForDropdown.Count > 1
? (object)new { @class = "form-control", required = "true", }
: new { @class = "form-control", required = "true", disabled = "disabled" })
You have to use the conditional operator here for the anonymous objects because the dropdown list will be disabled if the word ‘disabled’ is rendered in the tag in any way.
In a codebase I work in, NHibernate needs an HttpContext to get its current session – like this:
public static ISession GetCurrentSession()
{
var context = HttpContext.Current;
var currentSession = context.Items[CurrentSessionKey] as ISession;
...
To get my hands on a session for a NUnit test – I put this in the setup:
HttpContext.Current = new HttpContext(
new HttpRequest(null, "http://tempuri.org", null),
new HttpResponse(null));
Also, I wipe the context in the teardown:
<code>
[TearDown]
public void TearDown()
{
HttpContext.Current = null;
}
</code>
Credit for this goes to Caio Proiete:
http://caioproiete.net/en/fake-mock-httpcontext-without-any-special-mocking-framework/
Here is a simple way to download a file to a .net user control from a newer MVC controller.
The Controller code:
public FileResult DownloadSweetFile()
{
var downloadDirectory = _appSettings.PathToFile;
var filePathAndName = Path.Combine(downloadDirectory, "MySweetFile.pdf");
var cd = new System.Net.Mime.ContentDisposition
{
FileName = "MySweetFile.pdf",
Inline = false, //NOTE: This forces always prompting the user to download, not open file in the browser
};
Response.AppendHeader("Content-Disposition", cd.ToString());
return File(filePathAndName, "application/pdf");
}
I used a button on the page to fire the javascript
button type="button" id="btnSweetDownload" onclick="downloadSweetFile();" Click here to download a Sweet File!
(I removed the button tag so this will show correctly)
And here is the javascript to use in the .ascx file:
function downloadSweetFile() {
var url = '/MyControllerName/DownloadSweetFile';
window.location = url;
};
I think that most days, code remodeler would be the right job title for a lot of us. We take working code and just make it better working code.
The book that got me started thinking of myself as a ‘code remodeler’ is Refactoring: Improving the Design of Existing Code
If you haven’t read it, go get it quick! (Of course, and then read it…) Fowler lays out refactoring techniques in a straightforward way. You can start applying it immediately. I use Replace magic number with symbolic constant and Extract Method almost every day when I am helping a team with an older codebase.
Thanks for stopping by, and happy coding,
-Jim
I often want to generate a message in an .Net MVC controller class and present that to the user with toastr.
Here is a nice pattern for doing just that using TempData.
In a javascript file that is accessible to all the views that are using toastr:
$(document).ready(function() {
if ($('#success').val()) {
displayMessage($('#success').val(), 'success');
}
if ($('#info').val()) {
displayMessage($('#info').val(), 'info');
}
if ($('#warning').val()) {
displayMessage($('#warning').val(), 'warning');
}
if ($('#error').val()) {
displayMessage($('#error').val(), 'error');
}
});
var displayMessage = function (message, msgType) {
toastr.options = {
“closeButton”: false,
“debug”: false,
“positionClass”: “toast-top-right”,
“onClick”: null,
“showDuration”: “300”,
“hideDuration”: “1000”,
“timeOut”: “8000”,
“extendedTimeOut”: “1000”,
“showEasing”: “swing”,
“hideEasing”: “linear”,
“showMethod”: “fadeIn”,
“hideMethod”: “fadeOut”
};
toastr[msgType](message);
};
If you are using razor with mvc, you can put this in your _layout:
@Html.Hidden(“success”,@TempData[“success”])
@Html.Hidden(“info”,@TempData[“info”])
@Html.Hidden(“warning”,@TempData[“warning”])
@Html.Hidden(“error”,@TempData[“error”])
On my current project, I am working on an older mixed webforms and mvc site so I put this in the views:
<input type="hidden" value="<%=TempData["success"]%>" id="success" />
<input type="hidden" value="<%=TempData["info"]%>" id="info" />
<input type="hidden" value="<%=TempData["warning"]%>" id="warning" />
<input type="hidden" value="<%=TempData["error"]%>" id="error" />
You send information back from the controller like this:
TempData["warn"] = "You must see this amazing information in a toast!!!";
function mySweetClickEvent(event) {
event = window.event || event; //NOTE: another lovely hack to make Firefox work…
var target = event.target ? event.target : event.srcElement; //NOTE: another lovely hack to make IE work
var senderToUse;
if (target) {
senderToUse = target; //this works for ie and chrome
} else {
senderToUse = event; //this works for firefox
}
…do stuff with the sender here…
}
var emailsDontMatchError = new CustomValidator
{
ValidationGroup = "Main",
IsValid = false,
ErrorMessage = "E-mail addresses do not match"
};
Page.Validators.Add(emailsDontMatchError);
/* This container keeps its aspect ratio */
/* padding-bottom actually sets the height proportionally to the width – yep, doesn’t seem logical right? */
.container {
position: relative;
height: 0;
padding-bottom: 50%;
}
/* properly aspected element inside the container */
.element {
position: absolute;
top: 0;
left: 0;
height: 100%;
width: 100%;
}
I was having trouble properly formatting a table in html with css and I found this on Stack Overflow.
Replace cellpadding with:
th, td { padding: 5px; }
Replace cellspacing with:
table { border-collapse: separate; border-spacing: 5px; } // cellspacing=”5″
table { border-collapse: collapse; border-spacing: 0; } // cellspacing=”0″
Replace valign with:
th, td { vertical-align: top; }
Replace align (center) with:
table { margin: 0 auto; }
The original article is here.
Jim Sowers 