Javascript 如何通过与 jQuery 集成来检查 TempData 是否为空？
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How can I check if TempData is null through integration with jQuery?
提问by The Vanilla Thrilla
I would like to show a toastr(aka a popup) if TempDataisn't null. However, I'm having trouble integrating the jQuery and Razor syntax together. This is my current javascript:
toastr如果TempData不为空，我想显示一个（又名弹出窗口）。但是，我无法将 jQuery 和 Razor 语法集成在一起。这是我目前的 javascript：
$(document).ready(function() {
if (@TempData["SuccessMessage"] != null) {
toastr.options = {
"closeButton": true,
"positionClass": "toast-bottom-right"
}
toastr.success("This is a test!");
}
});
However, the toastr isn't displaying. I'm already checking TempData further up to also display text to the user.
但是，toastr 没有显示。我已经在进一步检查 TempData 以向用户显示文本。
@if (TempData["SuccessMessage"] != null)
{
<div class="success-message">
@Html.Raw(@TempData["SuccessMessage"].ToString())
</div>
}
I'm wondering if an alternative would be to somehow use the above markup and just check if this div exists, and if so, show the toastr? Or perhaps I can integrate the two checks into one? Suggestions?
我想知道是否有一种替代方法是以某种方式使用上述标记并检查此 div 是否存在，如果存在，则显示 toastr？或者我可以将两张支票合二为一？建议？
回答by The Vanilla Thrilla
I was able to get it working with the following code:
我能够使用以下代码使其工作：
$(document).ready(function() {
var success = @((TempData["SuccessMessage"] != null).ToString().ToLower());
if (success == true) {
toastr.options = {
"closeButton": true,
"positionClass": "toast-bottom-right"
}
toastr.success("Success! You're now registered for Lose A Ton!");
}
});
For anyone curious, I had to call ToLower()because TempData would always return Trueor False, rather than trueor false. The reasons for this are explained here.
对于任何好奇的人，我不得不打电话，ToLower()因为 TempData 总是会返回Trueor False，而不是trueor false。此处解释了原因。
回答by Tsahi Asher
you should do something like
你应该做类似的事情
if (@(TempData["SuccessMessage"] == null ? "null" : ('"' + TempData["SuccessMessage"] + '"')) != null) {
so that the generated markup in case TempDate is null will be
以便在 TempDate 为 null 的情况下生成的标记将是
if (null != null) {
回答by kavitha Reddy
TempData Value in Jquery shown below.
Jquery 中的 TempData 值如下所示。
$(document).ready(function () {
var tempdataval = '@TempData["Value"]';
if (tempdataval != null && tempdataval != '') {
alert(tempdataval);
}
});
回答by saif ullah
if (@Html.Raw(Json.Encode(TempData["Exists"])) != null) {
if (@Html.Raw(Json.Encode(TempData["Exists"])) != null) {
toastr.error('oops!an error occured try again.');
}
}
回答by Jacob Roberts
You can wrap your java in <text></text>to tell Razor that it isn't c#, but inside a c# block
你可以把你的 java 包起来<text></text>告诉 Razor 它不是 c#，而是在 ac# 块内
@if (TempData["SuccessMessage"] != null)
{
<text>
toastr.options = {
"closeButton": true,
"positionClass": "toast-bottom-right"
}
toastr.success("This is a test!");
</text>
}
You can also convert @(TempData["SuccessMessage"] != null)into a javascript bool and then use a javascript if statement, like so...
您还可以转换@(TempData["SuccessMessage"] != null)为 javascript bool，然后使用 javascript if 语句，就像这样......
var hasSuccessMsg = @(TempData["SuccessMessage"] != null) === 'true';
if (hasSuccessMsg) {
//do your work here.
}
回答by Harry
`@if (TempData["SuccessMessage"] != null) {
<script>
$(document).ready(function() {
toastr.options = {
"closeButton": true,
"positionClass": "toast-bottom-right"
}
toastr.success("This is a test!");
});
</script>
}`
