C# 根据值选中或取消选中复选框？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/11839525/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Make a checkbox checked or unchecked based on the value?
提问by always v
How can we make a checkbox checked or unchecked programatically based on the value? That is to say, for a particular user if the value is true, the checkbox should be checked, else if the value is false the checkbox needs to be unchecked. I declared the checkbox in the following way:
我们如何根据值以编程方式选中或取消选中复选框？也就是说，对于特定用户，如果值为true，则应选中复选框，否则，如果值为false，则需要取消选中复选框。我通过以下方式声明了复选框：
<input type="checkbox" class="checkbox">
采纳答案by Yasser Shaikh
if(condition = true)
{
@Html.CheckBoxFor(x => x.Test, new { @checked = "checked" })
}
else
{
@Html.CheckBoxFor(x => x.Test)
}
Hope this helps :)
希望这可以帮助 ：）
回答by hYk
You have to have a name for the checkbox, eg:
您必须为复选框命名，例如：
<input name=checkBox1 type="checkbox" class="checkbox">
For functionality :
对于功能：
if(x==1){
checkBox1.Checked = true; //To Check
}
else{
checkBox1.Checked = false // To Uncheck
}
回答by Umesh
If you want to check/uncheck check box value in code-behind, you have to include an ID and runat server attributes in your check box tag.
如果要在代码隐藏中选中/取消选中复选框值，则必须在复选框标记中包含 ID 和 runat 服务器属性。
<checkbox Id="chk" runat="server" class="chkbox"/>
code-behind:
代码隐藏：
if(yourcondition==true)
chk.checked = true;
else
chk.checked = false;
If you want to do it in javascript
如果你想用javascript来做
<checkbox Id="chk" class="chkbox"/>
JS:
JS：
if(yourcondition==true)
chk.checked = true;
else
chk.checked = false;
回答by Faust
If you're using MVC and passing in model values correctly from your controller, then
如果您使用 MVC 并从控制器正确传递模型值，那么
@Html.CheckBoxFor(model => model.checkBox1)
...is all you need. The html-helper does the logic to figure out whether or not to insert the checked="checkbox"code.
...是你所需要的全部。html-helper 执行逻辑以确定是否插入checked="checkbox"代码。
Otherwise, without the HTML-helper you can dynamically generate the attribute yourself (others have pointed out how), but don't make the mistake of thinking that checked = ""will leave the box unchecked. See this answerfor an explanation.
否则，如果没有 HTML 助手，您可以自己动态生成属性（其他人已经指出了如何），但不要错误地认为checked = ""会取消选中该框。请参阅 此答案以获取解释。
回答by DavGarcia
There is a simpler way to include or not include the checkedattribute if you are writing our your own <input>instead of using alternatives such as Html.CheckBoxFor:
checked如果您正在编写自己的属性<input>而不是使用替代方法，则有一种更简单的方法来包含或不包含该属性，例如Html.CheckBoxFor：
<input type="checkbox" checked="@isChecked">
Razor is smart enough to automatically generate either
Razor 足够智能，可以自动生成
<input type="checkbox" checked="checked">
or
或者
<input type="checkbox">
depending on whether isCheckedis trueor false. No need for if statements or duplicate code.
取决于isChecked是true还是false。不需要 if 语句或重复代码。
回答by ranah
If you do not want to use @Html.CheckBoxFor for whatever reason and you'd like to stick to
如果您出于任何原因不想使用 @Html.CheckBoxFor 并且想坚持使用
<input type="checkbox">
then this is what I found to be the best way to do it:
那么这就是我发现的最好的方法：
<input @(Convert.ToBoolean(Model.YourPropertyHere) == true ? "checked='checked'" : string.Empty) type="checkbox" />
The code that @Yasser provided above:
@Yasser 上面提供的代码：
checked="@(required ? "checked" : "")"
Did not work for me because it was still adding the checked attribute to the element, and setting checked="" will still render the check box as checked, which was not the desired output, instead if you wrap the whole statement into a razor block like so:
对我不起作用，因为它仍在向元素添加 checked 属性，并且设置 checked="" 仍会将复选框呈现为选中状态，这不是所需的输出，而是将整个语句包装到一个剃刀块中像这样：
@(Convert.ToBoolean(Model.YourPropertyHere) == true ? "checked='checked'" : string.Empty)
you will get the desired results.
你会得到想要的结果。
回答by Raj
try this:
尝试这个：
<input type="radio" name="filter_favorites" value="Favorites" @(loggedIn ? "checked" : "") />
So this is a simple radio button which checks loggedInvariable & if true radio button will be checked else not.
所以这是一个简单的单选按钮，它检查loggedIn变量，如果真单选按钮将被检查，否则不检查。
回答by Prince
if(condition = true)
{
@Html.CheckBoxFor(x => x.Test, new { @checked = true })
}
else
{
@Html.CheckBoxFor(x => x.Test)
}
