我遇到了一个让我抓狂的问题。我正在尝试修改 openid 选择器以支持 facebook。我使用 RPXNow 作为我的提供程序，因此它要求将表单提交到与标准不同的 url。
例如。 RpxNow 要求我像这样设置我的表单：
<form action="https://wikipediamaze.rpxnow.com/openid/start?token_url=...">
这适用于除 Facebook 和 Myspace 之外的所有提供商。这些要求将表单发布到不同的网址，如下所示：
<form action="https://wikipediamaze.rpxnow.com/facebook/start?token_url=...">
and
<form action="https://wikipediamaze.rpxnow.com/myspace/start?token_url=...">
open id 选择器在表单上有一堆按钮，每个按钮代表 openid 提供者。我想做的是检测何时单击 Facebook 或 Myspace 按钮并在提交之前更改表单上的操作。但是它不起作用。这是我的代码。
我尝试了几种变体，但都有相同的“不支持”异常
$("#openid_form").attr("action", form_url)
document.forms[0].action = form_url
有什么建议么？
Update
以下是有关代码的更多详细信息。为了简洁起见，我省略了一些内容。我所做的唯一一件事是将 Facebook 部分添加到“providers_large”对象（成功将徽标添加到网站），并且我没有提供标识用户的 url，而是创建一个名为“form_url”的属性，其中是我想要将表单的操作设置为的内容。如果您查看标题“Provider image click”部分，您将看到我在哪里检查属性“form_url”是否存在，并使用 jQuery 更改操作并提交表单。然而，当我在调试模式下单步执行 JavaScript 时，它告诉我这是一个无效的操作。
var providers_large = {
google: {
name: 'Google',
url: 'https://www.google.com/accounts/o8/id'
},
facebook: {
name: 'Facebook',
form_url: 'http://wikipediamaze.rpxnow.com/facebook/start?token_url=http://www.wikipediamaze.com/Accounts/Logon'
},
};
var providers_small = {
myopenid: {
name: 'MyOpenID',
label: 'Enter your MyOpenID username.',
url: 'http://{username}.myopenid.com/'
},
livejournal: {
name: 'LiveJournal',
label: 'Enter your Livejournal username.',
url: 'http://{username}.livejournal.com/'
},
flickr: {
name: 'Flickr',
label: 'Enter your Flickr username.',
url: 'http://flickr.com/{username}/'
},
technorati: {
name: 'Technorati',
label: 'Enter your Technorati username.',
url: 'http://technorati.com/people/technorati/{username}/'
},
wordpress: {
name: 'Wordpress',
label: 'Enter your Wordpress.com username.',
url: 'http://{username}.wordpress.com/'
},
blogger: {
name: 'Blogger',
label: 'Your Blogger account',
url: 'http://{username}.blogspot.com/'
},
verisign: {
name: 'Verisign',
label: 'Your Verisign username',
url: 'http://{username}.pip.verisignlabs.com/'
},
vidoop: {
name: 'Vidoop',
label: 'Your Vidoop username',
url: 'http://{username}.myvidoop.com/'
},
verisign: {
name: 'Verisign',
label: 'Your Verisign username',
url: 'http://{username}.pip.verisignlabs.com/'
},
claimid: {
name: 'ClaimID',
label: 'Your ClaimID username',
url: 'http://claimid.com/{username}'
}
};
var providers = $.extend({}, providers_large, providers_small);
var openid = {
cookie_expires: 6*30, // 6 months.
cookie_name: 'openid_provider',
cookie_path: '/',
img_path: 'images/',
input_id: null,
provider_url: null,
init: function(input_id) {
var openid_btns = $('#openid_btns');
this.input_id = input_id;
$('#openid_choice').show();
$('#openid_input_area').empty();
// add box for each provider
for (id in providers_large) {
openid_btns.append(this.getBoxHTML(providers_large[id], 'large', '.gif'));
}
if (providers_small) {
openid_btns.append('<br/>');
for (id in providers_small) {
openid_btns.append(this.getBoxHTML(providers_small[id], 'small', '.ico'));
}
}
$('#openid_form').submit(this.submit);
var box_id = this.readCookie();
if (box_id) {
this.signin(box_id, true);
}
},
getBoxHTML: function(provider, box_size, image_ext) {
var box_id = provider["name"].toLowerCase();
return '<a title="'+provider["name"]+'" href="javascript: openid.signin(\''+ box_id +'\');"' +
' style="background: #FFF url(' + this.img_path + box_id + image_ext+') no-repeat center center" ' +
'class="' + box_id + ' openid_' + box_size + '_btn"></a>';
},
/* Provider image click */
signin: function(box_id, onload) {
var provider = providers[box_id];
if (! provider) {
return;
}
this.highlight(box_id);
this.setCookie(box_id);
// prompt user for input?
if (provider['label']) {
this.useInputBox(provider);
this.provider_url = provider['url'];
}
else if(provider['form_url']) {
$('#openid_form').attr("action", provider['form_url']);
$('#openid_form').submit();
}
else {
this.setOpenIdUrl(provider['url']);
if (! onload) {
$('#openid_form').submit();
}
}
},
/* Sign-in button click */
submit: function() {
var url = openid.provider_url;
if (url) {
url = url.replace('{username}', $('#openid_username').val());
openid.setOpenIdUrl(url);
}
return true;
},
setOpenIdUrl: function (url) {
var hidden = $('#'+this.input_id);
if (hidden.length > 0) {
hidden.value = url;
} else {
$('#openid_form').append('<input type="hidden" id="' + this.input_id + '" name="' + this.input_id + '" value="'+url+'"/>');
}
},
highlight: function (box_id) {
// remove previous highlight.
var highlight = $('#openid_highlight');
if (highlight) {
highlight.replaceWith($('#openid_highlight a')[0]);
}
// add new highlight.
$('.'+box_id).wrap('<div id="openid_highlight"></div>');
},
setCookie: function (value) {
var date = new Date();
date.setTime(date.getTime()+(this.cookie_expires*24*60*60*1000));
var expires = "; expires="+date.toGMTString();
document.cookie = this.cookie_name+"="+value+expires+"; path=" + this.cookie_path;
},
readCookie: function () {
var nameEQ = this.cookie_name + "=";
var ca = document.cookie.split(';');
for(var i=0;i < ca.length;i++) {
var c = ca[i];
while (c.charAt(0)==' ') c = c.substring(1,c.length);
if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
}
return null;
},
useInputBox: function (provider) {
var input_area = $('#openid_input_area');
var html = '';
var id = 'openid_username';
var value = '';
var label = provider['label'];
var style = '';
if (label) {
html = '<p>' + label + '</p>';
}
if (provider['name'] == 'OpenID') {
id = this.input_id;
value = 'http://';
style = 'background:#FFF url('+this.img_path+'openid-inputicon.gif) no-repeat scroll 0 50%; padding-left:18px;';
}
html += '<input id="'+id+'" type="text" style="'+style+'" name="'+id+'" value="'+value+'" />' +
'<input id="openid_submit" type="submit" value="Sign-In"/>';
input_area.empty();
input_area.append(html);
$('#'+id).focus();
}
};
