如何在 jQuery 中创建验证

Question

我正在努力为 jQuery 中的输入创建验证。我有一个 btn 来创建一行。当我单击此 btn 时，您将看到一个弹出页面，其中包括 2 个文本框和 1 个下拉菜单。我想检查这些拖曳文本框是否不为空，然后它会提交。这是我创建的 btn 打开弹出窗口：

<div class="col-lg-12 panel">
    <a href="#" class="btn btn-primary" data-toggle="modal" data-target="#editModal">
        <span class="glyphicon glyphicon-plus" aria-hidden="true"></span> @Resource.Add_new_item
    </a>
</div>

这就是弹出窗口中的内容：

<div class="modal fade" id="editModal" tabindex="-1" role="dialog" aria-labelledby="addModalLabel" aria-hidden="true">
        <div class="modal-dialog" role="document">
            @using (Html.BeginForm("Edit", "ApplicationDetailList", new {page = Model.PageNumber,filter.ListType, filter.PackageName }, FormMethod.Post))
            {
                @Html.AntiForgeryToken()
                <div class="modal-content">
                    <div class="modal-header">
                        <h5 class="modal-title" id="addModalLabel">@Resource.Add_new_item </h5>
                    </div>
                    <div class="modal-body">
                        <div class="form-group">
                            <label>@Resource.Application_category_tittle *</label>
                            <input name="id" id="id" class="form-control" style="direction: ltr;"/>
                            @*@Html.ValidationMessageFor(m => m[0].Id);*@
                        </div>
                        <div class="form-group">
                            <label>@Resource.List_type *</label>
                            @Html.DropDownList("listType", ApplicationDetailListType.Solr.ToSelectListItems(false, filter.ListType), new { @class = "form-control"})                           
                            @*<input name="tags" class="form-control" style="direction: ltr;"/>*@
                        </div>
                        <div class="form-group">
                            <label>@Resource.Package_name *</label>
                            <input name="packageName" class="form-control" style="direction: ltr;"id="packageName" />
                            @*@Html.ValidationMessageFor(m=>m[0].PackageName);*@
                        </div>
                        <label id="validation">

                        </label>
                        <div class="form-group">
                        </div>
                    </div>
                    <div class="modal-footer">
                        <button type="button" class="btn btn-success btn-edit-save">@Resource.Save</button>
                        <button type="button" class="btn btn-secondary" data-dismiss="modal">@Resource.Cancel</button>
                    </div>
                </div>
            }
        </div>
    </div>

这是我制作的部分脚本：

var edit = $("#editModal");
           // var packageName = $("#packageName").val();
            //var id = $("#id").val();
            //packageName.length > 0 && id.length > 0 ?
                 $(".btn-edit-save").click(function() {
                    $("form", edit).submit();
                });

问题出在这里：

 $(".btn-edit-save").click(function() {
                    $("form", edit).submit();
                });

如果输入为空，我不想提交，只显示它们为空的消息。非常感谢

Answer 1

您可以附加一个标签错误属于文本框和边框错误字段为

$(".btn-edit-save").click(function() {
     var title = $('#id').val();
     var packageName = $('#packageName').val();
     var isValid = true;
     if(title == ""){
        $('#id').after("<label class='error'>Title is required</label>");
        $('#id').css('border', '1px solid red');
        isValid = false;
     }
     if(packageName == ""){
        $('#packageName').after("<label class='error'>PackageName is required</label>");
        $('#packageName').css('border', '1px solid red');
        isValid = false;
     }
     if(isValid){
        //submit form
        //$("form", edit).submit();
     }
});

$(".btn-edit-save").click(function() {
     var title = $('#id').val();
     var packageName = $('#packageName').val();
     var isValid = true;
     if(title == ""){
        $('#id').after("<label class='error'>Title is required</label>");
        $('#id').css('border', '1px solid red');
        isValid = false;
     }
     if(packageName == ""){
        $('#packageName').after("<label class='error'>PackageName is required</label>");
        $('#packageName').css('border', '1px solid red');
        isValid = false;
     }
     if(isValid){
        //submit form
        //$("form", edit).submit();
     }
});

.error{
color:red;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="modal-content">
                    <div class="modal-header">
                        <h5 class="modal-title" id="addModalLabel">@Resource.Add_new_item </h5>
                    </div>
                    <div class="modal-body">
                        <div class="form-group">
                            <label>@Resource.Application_category_tittle *</label>
                            <input name="id" id="id" class="form-control" style="direction: ltr;"/>
                            
                        </div>
                      
                        <div class="form-group">
                            <label>@Resource.Package_name *</label>
                            <input name="packageName" class="form-control" style="direction: ltr;"id="packageName" />
                            
                        </div>
                        <label id="validation">

                        </label>
                        <div class="form-group">
                        </div>
                    </div>
                    <div class="modal-footer">
                        <button type="button" class="btn btn-success btn-edit-save">@Resource.Save</button>
                        <button type="button" class="btn btn-secondary" data-dismiss="modal">@Resource.Cancel</button>
                    </div>
                </div>

Answer 2

如果您不想在输入为空的情况下提交，您可以使用Ajax.Beginform 而不是Html.Beginform。您可以使用Ajax.BeginForm 的OnBegin 属性定义一个javascript 函数并在提交之前触发它。

但您还应该添加对jquery.unobtrusive-ajax.min.js 的引用。

<html>
<head>
    <script src="/Scripts/jquery-[yourVersion].min.js" type="text/javascript"></script>
    <script src="/Scripts/jquer.unobtrusive-ajax.min.js" type="text/javascript"></script>
    <script type="text/javascript">
        function YourValidationFunc() {
            //add your validation code
            return true;
        }
    </script>
</head>
<body>
    <div>
        @using (Ajax.BeginForm("Edit", "ApplicationDetailList", new AjaxOptions
            {
                HttpMethod = "POST",
                OnBegin = "return YourValidationFunc();"
            }, new { page = Model.PageNumber,filter.ListType, filter.PackageName }))
        {
            @Html.AntiForgeryToken()
            <div class="modal-content">
                <div class="modal-header">
                    <h5 class="modal-title" id="addModalLabel">@Resource.Add_new_item </h5>
                </div>
                <div class="modal-body">
                    <div class="form-group">
                        <label>@Resource.Application_category_tittle *</label>
                        <input name="id" id="id" class="form-control" style="direction: ltr;"/>
                        @*@Html.ValidationMessageFor(m => m[0].Id);*@
                    </div>
                    <div class="form-group">
                        <label>@Resource.List_type *</label>
                        @Html.DropDownList("listType", ApplicationDetailListType.Solr.ToSelectListItems(false, filter.ListType), new { @class = "form-control"})                           
                        @*<input name="tags" class="form-control" style="direction: ltr;"/>*@
                    </div>
                    <div class="form-group">
                        <label>@Resource.Package_name *</label>
                        <input name="packageName" class="form-control" style="direction: ltr;"id="packageName" />
                        @*@Html.ValidationMessageFor(m=>m[0].PackageName);*@
                    </div>
                    <label id="validation">

                    </label>
                    <div class="form-group">
                    </div>
                </div>
                <div class="modal-footer">
                    <input type="submit" name="Submit" class="btn btn-success btn-edit-save" value="@Resource.Save" />
                    <button type="button" class="btn btn-secondary" data-dismiss="modal">@Resource.Cancel</button>
                </div>
            </div>
        }
    </div>
</body>
</html>

在上面的示例中，OnBegin 将通过以下方式触发：

<input type="submit" name="Submit" class="btn btn-success btn-edit-save" value="@Resource.Save" />

Answer 3

您可以为输入元素添加“必需”属性，如下所示

  <input type="text" required name="anyName" />

如果你想明确检查，然后通过选择器检查。 $("#Selectorname").val() //如果有的话会给你价值

Answer 4

Jquery 中的$.submit 方法提交表单。

在调用提交方法之前你需要验证

$(".btn-edit-save").click(function() {
             if(validate(fname)==true)
               {
                 $("form", edit).submit();
                }
               else alert("empty fname");
            });