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  • go programming POST FormValue can't be printed

    - by poor_programmer
    Before I being a bit of background, I am very new to go programming language. I am running go on Win 7, latest go package installer for windows. I'm not good at coding but I do like some challenge of learning a new language. I wanted to start learn Erlang but found go very interesting based on the GO I/O videos in youtube. I'm having problem with capturing POST form values in GO. I spend three hours yesterday to get go to print a POST form value in the browser and failed miserably. I don't know what I'm doing wrong, can anyone point me to the right direction? I can easily do this in another language like C#, PHP, VB, ASP, Rails etc. I have search the entire interweb and haven't found a working sample. Below is my sample code. Here is Index.html page {{ define "title" }}Homepage{{ end }} {{ define "content" }} <h1>My Homepage</h1> <p>Hello, and welcome to my homepage!</p> <form method="POST" action="/"> <p> Enter your name : <input type="text" name="username"> </P> <p> <button>Go</button> </form> <br /><br /> {{ end }} Here is the base page <!DOCTYPE html> <html lang="en"> <head> <title>{{ template "title" . }}</title> </head> <body> <section id="contents"> {{ template "content" . }} </section> <footer id="footer"> My homepage 2012 copy </footer> </body> </html> now some go code package main import ( "fmt" "http" "strings" "html/template" ) var index = template.Must(template.ParseFiles( "templates/_base.html", "templates/index.html", )) func GeneralHandler(w http.ResponseWriter, r *http.Request) { index.Execute(w, nil) if r.Method == "POST" { a := r.FormValue("username") fmt.Fprintf(w, "hi %s!",a); //<-- this variable does not rendered in the browser!!! } } func helloHandler(w http.ResponseWriter, r *http.Request) { remPartOfURL := r.URL.Path[len("/hello/"):] fmt.Fprintf(w, "Hello %s!", remPartOfURL) } func main() { http.HandleFunc("/", GeneralHandler) http.HandleFunc("/hello/", helloHandler) http.ListenAndServe("localhost:81", nil) } Thanks! PS: Very tedious to add four space before every line of code in stackoverflow especially when you are copy pasting. Didn't find it very user friendly or is there an easier way?

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  • Erlang: HTTP Accept Header with Inets

    - by Ted Karmel
    I am trying to do the equivalent of the following curl command : curl -H "Accept: text/plain" http://127.0.0.1:8033/stats I tried with an Inets simple http request. But, it isn't processed. How can I specify in Inets (or some other Erlang http client for that matter) the accept header requirement?

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  • spring mvc, css and javascript is not working properly

    - by user2788424
    the css and javascript is not take effect on my page. I google online, people saying this is the magic, but not happening on my page. <mvc:resources mapping="/resources/**" location="/resources/" /> this is the error: Nov 02, 2013 9:19:29 PM org.springframework.web.servlet.DispatcherServlet noHandlerFound WARNING: No mapping found for HTTP request with URI [/myweb/resources/css/styles.css] in DispatcherServlet with name 'dispatcher' Nov 02, 2013 9:19:29 PM org.springframework.web.servlet.DispatcherServlet noHandlerFound WARNING: No mapping found for HTTP request with URI [/myweb/resources/script.js] in DispatcherServlet with name 'dispatcher' Nov 02, 2013 9:19:29 PM org.springframework.web.servlet.DispatcherServlet noHandlerFound WARNING: No mapping found for HTTP request with URI [/myweb/resources/js/jquery-1.10.2.min.js] in DispatcherServlet with name 'dispatcher' here is the applicationContext.xml <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd"> <context:component-scan base-package="org.peterhuang.myweb" /> <mvc:resources mapping="/resources/**" location="/resources/" /> <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"> </bean> <bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping"> </bean> <!-- Hibernate Transaction Manager --> <bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager"> <property name="sessionFactory" ref="sessionFactory" /> </bean> <mvc:annotation-driven /> <!-- Activates annotation based transaction management --> <tx:annotation-driven /> <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> <property name="location" value="classpath:jdbc.properties" /> </bean> <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="viewClass" value="org.springframework.web.servlet.view.JstlView" /> <property name="prefix" value="/WEB-INF/"></property> <property name="suffix" value=".jsp"></property> </bean> <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName" value="${jdbc.driverClassName}" /> <property name="url" value="${jdbc.url}" /> <property name="username" value="${jdbc.username}" /> <property name="password" value="${jdbc.password}" /> </bean> <bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean"> <property name="dataSource" ref="dataSource" /> <property name="packagesToScan" value="org.peterhuang.myweb" /> <property name="hibernateProperties"> <props> <prop key="hibernate.dialect"> ${jdbc.dialect} </prop> <prop key="hibernate.show_sql"> ${hibernate.show_sql} </prop> <prop key="hibernate.format_sql"> ${hibernate.format_sql} </prop> </props> </property> </bean> here is the web.xml <?xml version="1.0" encoding="UTF-8"?> <web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> <display-name>my web</display-name> <servlet> <servlet-name>dispatcher</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/applicationContext.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>dispatcher</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <welcome-file-list> <welcome-file>/WEB-INF/jsp/welcome.jsp</welcome-file> </welcome-file-list> this is the page got displaied: <%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> <%@ taglib uri="http://www.springframework.org/tags" prefix="spring"%> <link type="text/css" rel="stylesheet" href="<spring:url value='resources/css/styles.css' />" /> <script type="text/javascript" src="<spring:url value='resources/js/jquery-1.10.2.min.js' />"></script> <script type="text/javascript" src="<spring:url value='resources/script.js'/>"</script> <ul id="button"> <c:forEach var="category" items="${categoryList}"> <li><a href="#">${category.categoryName}</a></li> </c:forEach> </ul> the folder structure in eclipse: myweb | | | |----Java Resources | | | | | |-----src/main/resources | | | | | | | | |------js | | | | | | | |-----jquery-1.10.2.min.js | | | | | | | | | | | |-----script.js | | | | | | | | |-----css | | | | | | | |-----style.css | | | | | | | | any tips would be appreciated!! thanks in advanced!

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  • How to assign a value to an pointer-pointer passed in call by reference?

    - by mystify
    I want to achieve something similar to what these guys do here: - (NSUInteger)countForFetchRequest:(NSFetchRequest *)request error:(NSError **)error like you can see, you pass an NSError pointer and that nice method will assign a real NSError object to your pointer in case there is an error. So the cool thing about this is, that the method returns an NSUInteger but can ALSO return an NSError, without having to mess around with ugly and fat arrays or dictionaries. So how could I assign an object to the passed-in error pointer?

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  • How do I change the curosr during a jQuery synchronous browser blocking POST?

    - by Tommy
    $.ajax({ url: "/cgi-bin/stats.exe", method: "post", async: false, data: { refresh: "a41" } }); Using ajax post synchronously - "async: false". While it blocks the browser during the active request, what is the most efficient way to change the cursor to the hourglass or display a wait .gif? Perhaps set the cursor as it enters this function then change it back in the success or complete function? Any advice is appreciated. Thank You.

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  • Performance of String literals vs constants for Session[...] dictionary keys

    - by FreshCode
    Session[Constant] vs Session["String Literal"] Performance I'm retrieving user-specific data like ViewData["CartItems"] = Session["CartItems"]; with a string literal for keys on every request. Should I be using constants for this? If yes, how should I go about implementing frequently used string literals and will it significantly affect performance on a high-traffic site? Related question does not address ASP.NET MVC or Session.

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  • What rendering services are available to convert URLs to images?

    - by tangens
    I know some services that encode the description of an image inside on an URL. For example: yuml.me for drawing UML Diagrams: or www.codecogs.com for rendering LaTeX equations: I really like these services to use them inside my javadoc to illustrate the documentation. On stackoverflow.com it's a bit tricky to encode these URLs, see my request at meta.stackoverflow.com. Question Are there any other rendering services that are useful for documenting source code?

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  • how to get text box value in page init?

    - by Amit
    Hi I am using asp.net 2.0 I set a hidden text box from javascript and on postback, i want to check the value stored on the text box in page init event. Here is what i tried string t = Request.Form["currentMode"].ToString(); but i get an error saying " Object reference not set to an instance of an object." Any idea?asp.

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  • Unable to migrate mail with large attachment upto 2 MB

    - by Preeti
    I am creating EML file with "System.Net.Mail".After that i am migrating it to Google Mail using google API ver 2. For small attachments it is working fine. But in case of large attachment upto (1 MB or 2 MB) it throwing exception "Request aborted". How can migrate mail with large file attachment? I got solution of sending large size attachment using System.Net.Mail. But how to implement it in case of Google apps? Thanx

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  • generate image of basic figures with perl

    - by jonny
    I am using jalava library as a diagram drawing tool. It displays firgures as images in order to maintain compatibility with majority of browsers. When diagram block is being resized a request is being made and new gif image is generated and send to browser. What I need is generating image of basic blocks, like rounded rectangle, circle, diamond with specified parameters (height, width and color). I want to do all server-side; my server part is written on Perl.

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  • Server.Transfer does not work?

    - by trnTash
    I want to redirect to another page using Server.Transfer and I have this simple code: if (Page.IsPostBack) { try { Server.Transfer("AnotherPage.aspx"); } catch (Exception) { throw ; } } But I'm getting an error: "Error executing child request for AnotherPage.aspx.". Could not find the solution on the net. Just to mention, Response.Redirect works flawlessly.

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  • php:unable to download youtube video using phptube class

    - by I Like PHP
    i m using phptube class for downloading you tube video. from this site In code i paste youtube url on a input box but there is errors below. Warning: file_get_contents(http://www.youtube.com/get_video?video_id=&t=) [function.file-get-contents]: failed to open stream: HTTP request failed! HTTP/1.0 404 Not Found and Warning: file_put_contents(./flvs/3Hx9VsqMUug.flv) [function.file-put-contents]: failed to open stream: No such file or directory in E:\xampp\htdocs\vdo\utube \functions.php on line 19 path:./flvs/3Hx9VsqMUug.flv please tell me where is problem???

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  • Wordpress ajax conflicts

    - by Phil
    I have problems with wordpress and ajax. The ajax request via jQuery just dont work. Jquery noconflict is enabled and the effects work but the ajax requst dont. Where could be the problem? Thank you!

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  • How Does Rails 3's "data-method='delete'" Degrade Gracefully?

    - by viatropos
    Rails 3 does some cool stuff to make Javascript unobtrusive, so they've done things like this: = link_to "Logout", user_session_path, :method => :delete ..converts to <a href="/logout" data-method="delete" rel="nofollow">Logout</a> But it just occurred to me.. When I turn off javascript the method isn't DELETE anymore, it's GET as expected. So are there plans to, or is there some way to, allow these data- attributes to degrade gracefully, so that link still is a DELETE request?

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  • load balancing in Tomcat

    - by Alvin
    Hi All, I want to implement the load balancing in tomcat 6.0 so that we can create more than one instance of a tomcat and when any of the instance is down then other instance will run our application. so that our application will never be down even when the large number of concurrent request comes. But i have no idea to implement it. Please give your precious suggestions.

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