javascript 如何知道 ModelState 是否包含错误
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How know if ModelState contains errors
提问by John x
When a form is posted in my controller, I make the following check:
在我的控制器中发布表单时，我会进行以下检查：
if(ModelState.IsValid)
If the model is not valid, errors are added to the ModelState. The model is then passed to the view with validation summary.
如果模型无效，则会将错误添加到ModelState. 然后将模型与验证摘要一起传递给视图。
However, I want to check if the ModelStatehas errors from inside the jQuery readyhandler, so that I can add some additional behavior if the form has errors. Is that possible?
但是，我想检查ModelStatejQueryready处理程序内部是否有错误，以便在表单有错误时添加一些额外的行为。那可能吗？
回答by Darin Dimitrov
You could spit global javascript variable:
你可以吐出全局 javascript 变量：
<script type="text/javascript">
var isValid = @Html.Raw(Json.Encode(ViewData.ModelState.IsValid));
</script>
and then:
接着：
$(function() {
if (!isValid) {
alert('opa');
}
});
回答by Amin Saqi
a little addition to @Dimitrov answer:
对@Dimitrov 回答的一点补充：
<script type="text/javascript">
var isValid = '@Html.Raw(Json.Encode(ViewData.ModelState.IsValid))';
if (isValid != 'true')
// model has some errors...
</script>
It's important to use single qoutes around the helper. Otherwise, that ending semicolon ;cause problems. Nether you can write it, nor you can't, at all cases it cause a syntax error. Unless you put those single quotes around the helper as I mentioned.
在 helper 周围使用单个 qoutes 很重要。否则，结尾的分号;会导致问题。你可以写它，也不能写，在任何情况下它都会导致语法错误。除非你像我提到的那样在帮助器周围加上那些单引号。
回答by raklos
In addition to Darins Answer:
除了达林斯回答：
In .cshtml:
在 .cshtml 中：
@Html.Hidden("IsValid", Json.Encode(ViewData.ModelState.IsValid))
in JS
在JS中
var isValid = $('#IsValid').val().toLowerCase() == "true";
