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页面重定向(Page Redirection)

 我正在处理一个脚本，我希望脚本（现在）根据他们按下哪个按钮来重定向用户。 最终它将采用表单输入并将其合并到重定向中，但现在我只是试图让按钮将用户发送到适当的站点。 但是，我的重定向不起作用。 
 

<html>
<head>
<title>
Home
</title>
</head>

<body>

<script type="text/javascript">
<!--

var textstring;
var btnWhichButton;

//Gets the text from the form
function getQ() {
    textstring = document.forms['Search'].elements[0].value;
}

//Does a Google Search
function googleSearch() {
    window.location ="http://www.google.com";
}

//Does a YouTube Search
function youtubeSearch() {
    window.location = "http://youtube.com"; 
}

//Figure out which button was pressed
function whichButton() {
    if (btnWhichButton.value == 'Google Search' ) {
        googleSearch();
    } else if (btnWhichButton.value == 'YouTube Search' ){
        youtubeSearch();
    } 
}

//main function to run everything
function main() {
    getQ();
    whichButton();
}
// -->
</script>


<form name="Search" >

<input type="text"   name="q" size="31" maxlength="255" value="" />
<input type="submit" value="Google Search" onclick="btnWhichButton=this; main();" />
<input type="submit" value="YouTube Search" onclick="btnWhichButton=this; main();" />

</form> 
</body>

</html>

 

 当任一按钮被点击时，页面只会重新加载？q =追加到url，它不会重定向。 任何帮助？ 

I'm working on a script where all I want it to do (right now) is redirect the user based on which button they press. Eventually it will take form input and incorporate that into the redirect, but right now I'm just trying to get the buttons to send the user off to the appropriate site. However, My redirects aren't working.
 

<html>
<head>
<title>
Home
</title>
</head>

<body>

<script type="text/javascript">
<!--

var textstring;
var btnWhichButton;

//Gets the text from the form
function getQ() {
    textstring = document.forms['Search'].elements[0].value;
}

//Does a Google Search
function googleSearch() {
    window.location ="http://www.google.com";
}

//Does a YouTube Search
function youtubeSearch() {
    window.location = "http://youtube.com"; 
}

//Figure out which button was pressed
function whichButton() {
    if (btnWhichButton.value == 'Google Search' ) {
        googleSearch();
    } else if (btnWhichButton.value == 'YouTube Search' ){
        youtubeSearch();
    } 
}

//main function to run everything
function main() {
    getQ();
    whichButton();
}
// -->
</script>


<form name="Search" >

<input type="text"   name="q" size="31" maxlength="255" value="" />
<input type="submit" value="Google Search" onclick="btnWhichButton=this; main();" />
<input type="submit" value="YouTube Search" onclick="btnWhichButton=this; main();" />

</form> 
</body>

</html>

 

When either button is clicked, the page just reloads with ?q= appended to the url, it doesn't redirect. Any help?

原文：https://stackoverflow.com/questions/2361419
更新时间：2023-04-25 12:04

最满意答案

 这是一个减少的repro： 
 

let f x (y:System.IComparable) = ()
let g = f 1

g 3
g "test" // not okay

let g' : System.IComparable -> unit = f 1
g' 3
g' "test" // okay

let g'' x = f 1 x
g'' 3
g'' "test" // okay

 

 g:('a -> unit) when 'a :> System.IComparable我的例子中的g:('a -> unit) when 'a :> System.IComparable ，编译器推断出g （ g:('a -> unit) when 'a :> System.IComparable的泛型类型。 但是， g是一个语法值，因此不能通用（请参阅有关值限制的问题），因此编译器需要选择特定类型。 如果您根本不使用g ，则会出现编译器错误。 如果您只使用一种具体类型，编译器将选择该类型。 如果您在多种类型下使用它，编译器将根据使用的第一种类型进行专门化，然后抛出错误。 
 

 两种解决方法是使用非泛型类型进行注释或者进行eta-expand，以便g不是语法值。 

Here's a cut down repro:
 

let f x (y:System.IComparable) = ()
let g = f 1

g 3
g "test" // not okay

let g' : System.IComparable -> unit = f 1
g' 3
g' "test" // okay

let g'' x = f 1 x
g'' 3
g'' "test" // okay

 

What happens is that the compiler infers a generic type for g (g:('a -> unit) when 'a :> System.IComparable in the case of my example). However, g is a syntactic value and therefor can't be generic (see questions about the value restriction), so the compiler needs to pick a specific type. If you don't use g at all, you'll get a compiler error. If you use it at exactly one concrete type, the compiler will pick that type. If you use it at more than one type, the compiler will specialize based on the first type used and throw an error after that.
 

Two workarounds are to either annotate with a non-generic type or to eta-expand so that g isn't a syntactic value.

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