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JavaScript validation for empty input field
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<script type="text/javascript">
function validateForm() {
var a = document.forms["Form"]["answer_a"].value;
var b = document.forms["Form"]["answer_b"].value;
var c = document.forms["Form"]["answer_c"].value;
var d = document.forms["Form"]["answer_d"...
Chrome: timeouts/interval suspended in background tabs?
...ke the timeouts have been running a lot slower. Tested in FF4 or IE9 this didn't occur.
6 Answers
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What is the usefulness of PUT and DELETE HTTP request methods?
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The DELETE method requests that the origin server delete the resource identified by the Request-URI. This method MAY be overridden by human intervention (or other means) on the origin server. The client cannot be guaranteed that the operation has been carried out, even if the status code return...
Reference: mod_rewrite, URL rewriting and “pretty links” explained
...ay also look like this:
GET /foo/bar?baz=42 HTTP/1.1
This is just as valid a request for a URL, and it has more obviously nothing to do with files.
The web server is an application listening on a port, accepting HTTP requests coming in on that port and returning a response. A web server is entir...
MySQL Cannot Add Foreign Key Constraint
...the parent column exactly. For example, since medicalhistory.MedicalHistoryID is an INT, Patient.MedicalHistory also needs to be an INT, not a SMALLINT.
Also, you should run the query set foreign_key_checks=0 before running the DDL so you can create the tables in an arbitrary order rather than need...
How to include layout inside layout?
How to include layout inside layout in Android?
6 Answers
6
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ASP.NET MVC A potentially dangerous Request.Form value was detected from the client when using a cus
...t; }
On the controller action add this attribute to allow all HTML
[ValidateInput(false)]
public ActionResult SomeAction(MyViewModel myViewModel)
Brute force in web.config - definitely not recommended
In the web.config file, within the tags, insert the httpRuntime element with the attribute ...
Numbering rows within groups in a data frame
...l, df$cat, FUN = seq_along)
or:
library(plyr)
ddply(df, .(cat), mutate, id = seq_along(val))
or:
library(dplyr)
df %>% group_by(cat) %>% mutate(id = row_number())
or (the most memory efficient, as it assigns by reference within DT):
library(data.table)
DT <- data.table(df)
DT[, id...
Changing the image source using jQuery
...You can use jQuery's attr() function. For example, if your img tag has an id attribute of 'my_image', you would do this:
<img id="my_image" src="first.jpg"/>
Then you can change the src of your image with jQuery like this:
$("#my_image").attr("src","second.jpg");
To attach this to a cli...
What is the advantage of using REST instead of non-REST HTTP?
...ons about how to use HTTP . I wonder which advantage these conventions provide. Does anyone know?
14 Answers
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