C# 使用jquery刷新验证码图像
我在剃须刀页面上有一个C# 使用jquery刷新验证码图像,c#,javascript,jquery,asp.net-mvc,captcha,C#,Javascript,Jquery,Asp.net Mvc,Captcha,我在剃须刀页面上有一个HTML图像标签。此图显示生成的验证码。我添加了一些jquery以在单击此图像时刷新它。这在我的电脑上有效,但一旦我将其发布到服务器上,单击图像时不会发生任何事情 <img id="captcha-image" src="@Url.Action("Captcha", "Home")" /> ... $("#captcha-image").click(function () { this.src = "@Url.Action("Captcha", "Hom
HTML
图像标签。此图显示生成的验证码。我添加了一些jquery以在单击此图像时刷新它。这在我的电脑上有效,但一旦我将其发布到服务器上,单击图像时不会发生任何事情
<img id="captcha-image" src="@Url.Action("Captcha", "Home")" />
...
$("#captcha-image").click(function () {
this.src = "@Url.Action("Captcha", "Home")";
});
这将不起作用,因为Next()
在System.Random
中不是静态方法,我需要引用一个Random
对象才能使用它
我还尝试使用JavaScript随机方法:
$("#captcha-image").click(function () {
var randomNumber = Math.floor(Math.random());
this.src = "@Url.Action("Captcha", "Home", new { r = randomNumber})";
});
这里的问题是变量
randomNumber
在@Url中的c#code块范围内不可见。Action
您可以使用replace更改randomNumber字符串及其值,也可以将外部双引号更改为single,并将randomNumber传递给匿名对象初始值设定项
this.src = '@Url.Action("Captcha", "Home", new { randomNumber = "_randomNumber_"})'.replace("_randomNumber_", randomNumber );
另一种方法是将服务器端代码与javascript连接起来,生成查询字符串
this.src = '@Url.Action("Captcha", "Home")?randomNumber' + randomNumber ;
this.src='@Url.Action(“验证码”,“主页”)?randomNumber='+randomNumber;为什么不在操作方法上使用
[OutputCache(NoStore=true,Duration=0,VaryByParam=“*””)
来防止缓存
this.src = '@Url.Action("Captcha", "Home")?randomNumber' + randomNumber ;
//Put This one Partial view
<img src="@Url.Action("GetCaptchaImage", "Vulpith_Public",new { dt=@DateTime.Now},Request.Url.Scheme)" />
//And call ajax from this partial view as following
function Captcharefresh() {
$.ajax({
url: "../Vulpith_Public/_GetCaptcha",
type: "post",
dataType: "html",
data: {},
success: function (data) {
$('#codeRefresh').html(data)
},
error: function (data) {
}
});
}
//and create actions as following
public FileResult GetCaptchaImage(DateTime dt)
{
CaptchaRandomImage CI = new CaptchaRandomImage();
this.Session["CaptchaImageText"] = CI.GetRandomString(5); // here 5 means I want to get 5 char long captcha
//CI.GenerateImage(this.Session["CaptchaImageText"].ToString(), 300, 75);
// Or We can use another one for get custom color Captcha Image
CI.GenerateImage(this.Session["CaptchaImageText"].ToString(), 300, 75, Color.DarkGray, Color.White);
MemoryStream stream = new MemoryStream();
CI.Image.Save(stream, ImageFormat.Png);
stream.Seek(0, SeekOrigin.Begin);
return new FileStreamResult(stream, "image/png");
}
//One more action as
[HttpPost]
public ActionResult _GetCaptcha()
{
return PartialView();
}