24

每当单击提交按钮时触发其必填字段验证器时，我都需要更改 TextBox 的颜色

4

16 回答 16

26

您可以做的是注册一个 Javascript 函数，该函数将在提交后遍历全局 Page_Validators 数组，您可以适当地设置背景。这样做的好处是您可以在页面上的所有控件上使用它。该函数如下所示：

function fnOnUpdateValidators()
{
   for (var i = 0; i < Page_Validators.length; i++)
   {
      var val = Page_Validators[i];
      var ctrl = document.getElementById(val.controltovalidate);
      if (ctrl != null && ctrl.style != null)
      {
         if (!val.isvalid)
            ctrl.style.background = '#FFAAAA';
         else
            ctrl.style.backgroundColor = '';
      }
   }
}

最后一步是使用 OnSubmit 事件注册脚本：

VB.NET：

Page.ClientScript.RegisterOnSubmitStatement(Me.GetType, "val", "fnOnUpdateValidators();")

C＃：

Page.ClientScript.RegisterOnSubmitStatement(this.GetType(), "val", "fnOnUpdateValidators();");

您将在后面的所有代码中保持正确的 IsValid 状态，并且它可以与您的所有控件一起使用。

注意：我从以下博客中找到了这个解决方案。我只是想在源博客出现故障的情况下在这里记录它。

于 2010-03-18T18:59:44.163 回答
18

您可以非常轻松地覆盖 ASP.NET 的更新已验证字段显示的 javascript 函数。这是一个不错的选择，因为您可以保留现有的字段验证器，而不必编写任何自定义验证逻辑或去寻找要验证的字段。在下面的示例中，我正在从具有类“控制组”的父元素中添加/删除一个“错误”类（因为我使用的是twitter bootstrap css）：

    /**
    * Re-assigns the ASP.NET validation JS function to
    * provide a more flexible approach
    */
    function UpgradeASPNETValidation() {
        if (typeof (Page_ClientValidate) != "undefined") {
            AspValidatorUpdateDisplay = ValidatorUpdateDisplay;
            ValidatorUpdateDisplay = NicerValidatorUpdateDisplay;
        }
    }

    /**
    * This function is called once for each Field Validator, passing in the 
    * Field Validator span, which has helpful properties 'isvalid' (bool) and
    * 'controltovalidate' (string = id of the input field to validate).
    */
    function NicerValidatorUpdateDisplay(val) {
        // Do the default asp.net display of validation errors (remove if you want)
        AspValidatorUpdateDisplay(val);

        // Add our custom display of validation errors
        if (val.isvalid) {
            // do whatever you want for invalid controls
            $('#' + val.controltovalidate).closest('.control-group').removeClass('error');
        } else {
            // reset invalid controls so they display as valid
            $('#' + val.controltovalidate).closest('.control-group').addClass('error');
        }
    }

    // Call UpgradeASPNETValidation after the page has loaded so that it 
    // runs after the standard ASP.NET scripts.
    $(document).ready(UpgradeASPNETValidation);

这是从这里稍微改编的，并从这些 文章中获得了有用的信息。

于 2012-08-14T14:13:27.747 回答
13

您可以使用 CustomValidator 而不是 RequiredFieldValidator：

.ASPX

<asp:CustomValidator ID="CustomValidator1" runat="server" ErrorMessage=""
    ControlToValidate="TextBox1" ClientValidationFunction="ValidateTextBox"
    OnServerValidate="CustomValidator1_ServerValidate"
    ValidateEmptyText="True"></asp:CustomValidator>

<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>

<script src="jquery-1.2.6.js" type="text/javascript"></script>
<script type="text/javascript">
    function ValidateTextBox(source, args)
    {
        var is_valid = $("#TextBox1").val() != "";
        $("#TextBox1").css("background-color", is_valid ? "white" : "red");
        args.IsValid = is_valid;
    }
</script>

。CS

protected void CustomValidator1_ServerValidate(object source, ServerValidateEventArgs args)
{
    bool is_valid = TextBox1.Text != "";
    TextBox1.BackColor = is_valid ? Color.White : Color.Red;
    args.IsValid = is_valid;
}

客户端和服务器验证函数中的逻辑相同，但客户端函数使用 jQuery 访问文本框值并修改其背景颜色。

于 2008-10-13T08:17:17.027 回答
5

聚会很晚，但以防万一其他人偶然发现这一点并想要一个与 Bootstrap 一起使用的完整答案，我已经采用了上面的所有示例，并制作了一个可以与附加到单个控件的多个验证器一起使用的版本，并将与验证组合作：

<script>
    /**
    * Re-assigns the ASP.NET validation JS function to
    * provide a more flexible approach
    */
    function UpgradeASPNETValidation() {
        if (typeof (Page_ClientValidate) != "undefined") {
            AspValidatorUpdateDisplay = ValidatorUpdateDisplay;
            ValidatorUpdateDisplay = NicerValidatorUpdateDisplay;
            AspValidatorValidate = ValidatorValidate;
            ValidatorValidate = NicerValidatorValidate;

            // Remove the error class on each control group before validating
            // Store a reference to the ClientValidate function
            var origValidate = Page_ClientValidate;
            // Override with our custom version
            Page_ClientValidate = function (validationGroup) {
                // Clear all the validation classes for this validation group
                for (var i = 0; i < Page_Validators.length; i++) {
                    if ((typeof(Page_Validators[i].validationGroup) == 'undefined' && !validationGroup) ||
                        Page_Validators[i].validationGroup == validationGroup) {
                        $("#" + Page_Validators[i].controltovalidate).parents('.form-group').each(function () {
                            $(this).removeClass('has-error');
                        });
                    }
                }
                // Call the original function
                origValidate(validationGroup);
            };
        }
    }

    /**
    * This function is called once for each Field Validator, passing in the 
    * Field Validator span, which has helpful properties 'isvalid' (bool) and
    * 'controltovalidate' (string = id of the input field to validate).
    */
    function NicerValidatorUpdateDisplay(val) {
        // Do the default asp.net display of validation errors (remove if you want)
        AspValidatorUpdateDisplay(val);

        // Add our custom display of validation errors
        // IF we should be paying any attention to this validator at all
        if ((typeof (val.enabled) == "undefined" || val.enabled != false) && IsValidationGroupMatch(val, AspValidatorValidating)) {
            if (!val.isvalid) {
                // Set css class for invalid controls
                var t = $('#' + val.controltovalidate).parents('.form-group:first');
                t.addClass('has-error');
            }
        }
    }

    function NicerValidatorValidate(val, validationGroup, event) {
        AspValidatorValidating = validationGroup;
        AspValidatorValidate(val, validationGroup, event);
    }

    // Call UpgradeASPNETValidation after the page has loaded so that it 
    // runs after the standard ASP.NET scripts.
    $(function () {
        UpgradeASPNETValidation();
    });
</script>
于 2014-09-15T22:40:50.547 回答
4

我喜欢 Rory 的回答，但它不适用于 ValidationGroups，当然在我的例子中，我在一个字段上有两个验证器，由两个不同的按钮触发。

问题是如果ValidatorValidate不在当前的ValidationGroup中，ValidatorValidate会将它标记为'isValid'，但是我们的类更改代码并没有注意。这意味着显示不正确（当然IE9似乎不喜欢玩）。

所以为了解决这个问题，我做了以下更改：

    /**
    * Re-assigns the ASP.NET validation JS function to
    * provide a more flexible approach
    */
    function UpgradeASPNETValidation() {
        if (typeof (Page_ClientValidate) != "undefined") {
            AspValidatorUpdateDisplay = ValidatorUpdateDisplay;
            ValidatorUpdateDisplay = NicerValidatorUpdateDisplay;
            AspValidatorValidate = ValidatorValidate;
            ValidatorValidate = NicerValidatorValidate;
        }
    }

    /**
    * This function is called once for each Field Validator, passing in the 
    * Field Validator span, which has helpful properties 'isvalid' (bool) and
    * 'controltovalidate' (string = id of the input field to validate).
    */
    function NicerValidatorUpdateDisplay(val) {
        // Do the default asp.net display of validation errors (remove if you want)
        AspValidatorUpdateDisplay(val);

        // Add our custom display of validation errors
        // IF we should be paying any attention to this validator at all
        if ((typeof (val.enabled) == "undefined" || val.enabled != false) && IsValidationGroupMatch(val, AspValidatorValidating)) {
            if (val.isvalid) {
                // do whatever you want for invalid controls
                $('#' + val.controltovalidate).parents('.control-group:first').removeClass('error');
            } else {
                // reset invalid controls so they display as valid
                //$('#' + val.controltovalidate).parents('.control-group:first').addClass('error');
                var t = $('#' + val.controltovalidate).parents('.control-group:first');
                t.addClass('error');
            }
        }
    }

    function NicerValidatorValidate(val, validationGroup, event) {
        AspValidatorValidating = validationGroup;
        AspValidatorValidate(val, validationGroup, event);
    }

    // Call UpgradeASPNETValidation after the page has loaded so that it 
    // runs after the standard ASP.NET scripts.
    $(document).ready(UpgradeASPNETValidation);
于 2012-10-12T13:08:24.053 回答
4

在 CSS 中：

       .form-control
        {
            width: 100px;
            height: 34px;
            padding: 6px 12px;
            font-size: 14px;
            color: black;
            background-color: white;
        }
        .form-control-Error
        {
            width: 100px;
            height: 34px;
            padding: 6px 12px;
            font-size: 14px;
            color: #EBB8C4;
            background-color: #F9F2F4
            border: 1px solid #DB7791;
            border-radius: 4px;
        }

在您的页面中：

<asp:TextBox ID="txtUserName" runat="server" CssClass="form-control"></asp:TextBox>
 <asp:RequiredFieldValidatorrunat="server"Display="Dynamic" ErrorMessage="PLease Enter UserName" ControlToValidate="txtUserName"></asp:RequiredFieldValidator>

在您上面的页面末尾

<script type="text/javascript">
    function WebForm_OnSubmit() {
        if (typeof (ValidatorOnSubmit) == "function" && ValidatorOnSubmit() == false) {
            for (var i in Page_Validators) {
                try {
                    var control = document.getElementById(Page_Validators[i].controltovalidate);
                    if (!Page_Validators[i].isvalid) {
                        control.className = "form-control-Error";
                    } else {
                        control.className = "form-control";
                    }
                } catch (e) { }
            }
            return false;
        }
        return true;
    }
</script>
于 2014-09-01T09:39:23.033 回答
3

我喜欢亚历山大的回答，但希望 javascript 更通用。因此，这是一种使用自定义验证器的错误的通用方法。

    function ValidateTextBox(source, args) {
        var cntrl_id = $(source).attr("controltovalidate");
        var cntrl = $("#" + cntrl_id);
        var is_valid = $(cntrl).val() != "";
        is_valid ? $(cntrl).removeClass("error") : $(cntrl).addClass("error");

        args.IsValid = is_valid;
    }
于 2010-03-27T14:00:57.130 回答
2

我知道这是旧的，但我有另一个来自 Dillie-O 和 Alexander 的修改组合。这使用带有 blur 事件的 jQuery 在验证成功时删除样式。

function validateFields() {
    try {
        var count = 0;
        var hasFocus = false;

        for (var i = 0; i < Page_Validators.length; i++) {
            var val = Page_Validators[i];
            var ctrl = document.getElementById(val.controltovalidate);

            validateField(ctrl, val);

            if (!val.isvalid) { count++; }
            if (!val.isvalid && hasFocus === false) {
                ctrl.focus(); hasFocus = true;
            }
        }

        if (count == 0) {
            hasFocus = false;
        }
    }
    catch (err) { }
}

function validateField(ctrl, val)
{
    $(ctrl).blur(function () { validateField(ctrl, val); });

    if (ctrl != null && $(ctrl).is(':disabled') == false) { // && ctrl.style != null
        val.isvalid ? $(ctrl).removeClass("error") : $(ctrl).addClass("error");
    }            

    if ($(ctrl).hasClass('rdfd_') == true) { //This is a RadNumericTextBox
        var rtxt = document.getElementById(val.controltovalidate + '_text');
        val.isvalid ? $(rtxt).removeClass("error") : $(rtxt).addClass("error");
    }
}
于 2011-08-18T15:32:52.827 回答
2

另一种可能性...此代码为控件提供了一个红色边框（或您在 CSS 类中放置的任何内容）以进行验证（适用于下拉列表和文本框，但可以扩展为按钮等...）

首先，我使用CustomValidator而不是 RequiredFieldValidator，因为这样您就可以使用 CustomValidator 的ClientValidationFunction来更改要验证的控件的 CSS。

例如：当用户忘记填写时更改文本框 MyTextBox 的边框。MyTextBox 控件的 CustomValidator 如下所示：

<asp:CustomValidator ID="CustomValidatorMyTextBox" runat="server" ErrorMessage=""
     Display="None" ClientValidationFunction="ValidateInput" 
     ControlToValidate="MyTextBox" ValidateEmptyText="true" 
     ValidationGroup="MyValidationGroup">
     </asp:CustomValidator>

或者它也可以用于需要选择的下拉列表。CustomValidator 看起来与上面相同，但 ControlToValidate 指向下拉列表。

对于客户端脚本，请使用 JQuery。ValidateInput 方法如下所示：

    <script type="text/javascript">
    function ValidateInput(source, args)
    {
        var controlName = source.controltovalidate;
        var control = $('#' + controlName);
        if (control.is('input:text')) {
            if (control.val() == "") {
                control.addClass("validation");
                args.IsValid = false;
            }
            else {
                control.removeClass("validation");
                args.IsValid = true;
            }
        }
        else if (control.is('select')) {
            if (control.val() == "-1"[*] ) {
                control.addClass("validation");
                args.IsValid = false;
            }
            else {
                control.removeClass("validation");
                args.IsValid = true;
            }
        }
    }
    </script>

“validation”类是一个 CSS 类，它包含验证器被触发时的标记。它可能看起来像这样：

.validation { border: solid 2px red; }

PS：要使边框颜色适用于 IE 中的下拉列表，请在页面标题中添加以下元标记：<meta http-equiv="X-UA-Compatible" content="IE=edge" />.

[*]这与RequiredFieldValidator 的“InitialValue”相同。这是用户尚未选择任何内容时默认选择的项目。​</p>

于 2012-05-31T07:26:52.857 回答
1

我也喜欢 Alexanders 和 Steves 的回答，但我想要和代码隐藏中的一样。我认为这段代码可能会这样做，但它会根据您的设置而有所不同。我的控件位于内容占位符内。

protected void cvPhone_ServerValidate(object source, ServerValidateEventArgs args)
{
    bool is_valid = !string.IsNullOrEmpty(args.Value);
    string control = ((CustomValidator)source).ControlToValidate;
    ((TextBox)this.Master.FindControl("ContentBody").FindControl(control)).CssClass = is_valid ? string.Empty : "inputError";
    args.IsValid = is_valid;
}
于 2010-07-01T12:27:02.543 回答
1

另一种方式，

$(document).ready(function() {
    HighlightControlToValidate();
    $('#<%=btnSave.ClientID %>').click(function() {
        if (typeof (Page_Validators) != "undefined") {
            for (var i = 0; i < Page_Validators.length; i++) {
                if (!Page_Validators[i].isvalid) {
                    $('#' + Page_Validators[i].controltovalidate).css("background", "#f3d74f");
                }
                else {
                    $('#' + Page_Validators[i].controltovalidate).css("background", "white");
                }
            }
        }
    });
});

参考： http: //www.codedigest.com/Articles/ASPNET/414_Highlight_Input_Controls_when_Validation_fails_in_AspNet_Validator_controls.aspx

于 2011-11-26T14:25:31.517 回答
1

我为常规的asp.net制作了一个有效的单页机示例，没有.control-group

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html>
<!-- http://stackoverflow.com/questions/196859/change-text-box-color-using-required-field-validator-no-extender-controls-pleas -->
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <script src="http://code.jquery.com/jquery-1.11.0.min.js"></script>
<script src="http://code.jquery.com/jquery-migrate-1.2.1.min.js"></script>
    <script>
        /**
  * Re-assigns the ASP.NET validation JS function to
  * provide a more flexible approach
  */
        function UpgradeASPNETValidation() {
            if (typeof (Page_ClientValidate) != "undefined") {
                AspValidatorUpdateDisplay = ValidatorUpdateDisplay;
                ValidatorUpdateDisplay = NicerValidatorUpdateDisplay;
                AspValidatorValidate = ValidatorValidate;
                ValidatorValidate = NicerValidatorValidate;
            }
        }

        /**
        * This function is called once for each Field Validator, passing in the 
        * Field Validator span, which has helpful properties 'isvalid' (bool) and
        * 'controltovalidate' (string = id of the input field to validate).
        */
        function NicerValidatorUpdateDisplay(val) {
            // Do the default asp.net display of validation errors (remove if you want)
            AspValidatorUpdateDisplay(val);

            // Add our custom display of validation errors
            // IF we should be paying any attention to this validator at all
            if ((typeof (val.enabled) == "undefined" || val.enabled != false) && IsValidationGroupMatch(val, AspValidatorValidating)) {
                if (val.isvalid) {
                    // do whatever you want for invalid controls
                    $('#' + val.controltovalidate).removeClass('error');
                } else {
                    // reset invalid controls so they display as valid
                    //$('#' + val.controltovalidate).parents('.control-group:first').addClass('error');
                    var t = $('#' + val.controltovalidate);
                    t.addClass('error');
                }
            }
        }

        function NicerValidatorValidate(val, validationGroup, event) {
            AspValidatorValidating = validationGroup;
            AspValidatorValidate(val, validationGroup, event);
        }

        // Call UpgradeASPNETValidation after the page has loaded so that it 
        // runs after the standard ASP.NET scripts.
        $(document).ready(UpgradeASPNETValidation);
    </script>
    <style>
        .error {
            border: 1px solid red;
        }
    </style>
</head>
<body>
    <form id="form1" runat="server">
    <div>

        <asp:TextBox ID="TextBox1" runat="server" ></asp:TextBox>
        <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="TextBox1" ErrorMessage="RequiredFieldValidator"></asp:RequiredFieldValidator>
        <asp:Button ID="Button1" runat="server" Text="Button" />

        <br />
        <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
        <asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ControlToValidate="TextBox2" ErrorMessage="RegularExpressionValidator" ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"></asp:RegularExpressionValidator>
        <br />
        <asp:TextBox ID="TextBox3" runat="server"></asp:TextBox>
        <asp:RangeValidator ID="RangeValidator1" runat="server" ControlToValidate="TextBox3" ErrorMessage="RangeValidator" MaximumValue="100" MinimumValue="0"></asp:RangeValidator>

    </div>
    </form>
</body>
</html>
于 2014-03-19T10:07:32.123 回答
0

并非完全没有改变用户习惯的控件，但我认为这种方式更容易（不写完整的例子，我认为没有必要）：

ASP.NET：

    <asp:TextBox ID="TextBox1" runat="server" ></asp:TextBox>
    <asp:CustomValidator runat="server" ControlToValidate="TextBox1" Display="Dynamic" Text="TextBox1 Not Set" ValidateEmptyText="true" OnServerValidate="ServerValidate" />
    <asp:Button ID="Button1" runat="server" Text="Button" OnClick="Execute" />

代码：

protected void Execute(object sender, EventArgs e)
{
   Page.Validate();
   if (Page.IsValid)
   {
       *some code*
   }
}

protected void ServerValidate(object source, ServerValidateEventArgs args)
{
    CustomValidator cval = source as CustomValidator;
    if (cval == null)
    {
        args.IsValid = false;
        return;
    }

    if (string.IsNullOrEmpty(args.Value))
    {
        args.IsValid = false;
        string _target = cval.ControlToValidate;
        TextBox tb = cval.Parent.FindControl(_target) as TextBox;
        tb.BorderColor = System.Drawing.Color.Red;
    }
    else
    {
        args.IsValid = true;
    }
}
于 2014-05-30T11:00:06.760 回答
0

这里有一些独立的 HTML/JS 可以解决问题：

<html>
  <head>
    <script type="text/javascript">
      function mkclr(cntl,clr) {
        document.getElementById(cntl).style.backgroundColor = clr;
      };
    </script>
  </head>
  <body>
    <form>
      <input type="textbox" id="tb1"></input>
      <input type="submit" value="Go"
        onClick="javascript:mkclr('tb1','red');">
      </input>
    </form>
  </body>
</html>
于 2008-10-13T07:27:31.153 回答
0

我必须对史蒂夫的建议进行一些修改才能让我的工作正常，

 function ValidateTextBox(source, args) {
    var controlId = document.getElementById(source.controltovalidate).id;
    var control = $("#" + controlId);
    var value = control.val();
    var is_valid = value != "";
    is_valid ? control.removeClass("error") : control.addClass("error");
    args.IsValid = is_valid;
  }

很好的例子，正是我需要的。

于 2013-03-04T11:49:17.443 回答
0 
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Custemvalidatin.aspx.cs" Inherits="AspDotNetPractice.Custemvalidatin" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <script type="text/javascript">
        function vali(source, args) {
            if (document.getElementById(source.controltovalidate).value.length > 0) {
                args.IsValid = true;
                document.getElementById(source.controltovalidate).style.borderColor = 'green';
            }
            else {
                args.IsValid = false;
                document.getElementById(source.controltovalidate).style.borderColor = 'red';
            }

        }
    </script>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            <asp:TextBox ID="TextBox1" Style="border:1px solid gray; width:270px; height:24px ; border-radius:6px;"   runat="server"></asp:TextBox>

            <asp:CustomValidator ID="CustomValidator1" runat="server" ControlToValidate="TextBox1"
                ErrorMessage="Enter First Name" SetFocusOnError="True" Display="Dynamic" ClientValidationFunction="vali" 
                ValidateEmptyText="True" Font-Size="Small" ForeColor="Red">Enter First Name</asp:CustomValidator><br /><br /><br />

            <asp:TextBox ID="TextBox2" Style="border:1px solid gray; width:270px; height:24px ; border-radius:6px;"  runat="server"></asp:TextBox>

            <asp:CustomValidator ID="CustomValidator2" runat="server" ClientValidationFunction="vali"
                ControlToValidate="TextBox2" Display="Dynamic" ErrorMessage="Enter Second Name"
                SetFocusOnError="True" ValidateEmptyText="True" Font-Size="Small" ForeColor="Red">Enter Second Name</asp:CustomValidator><br />
            <br />
            <br />

            <asp:Button ID="Button1" runat="server" Text="Button" />
        </div>
    </form>
</body>
</html>
于 2013-03-26T13:57:34.857 回答