树形验证 [英] Treeview validation

问题描述

树形视图有叶节点checkboxes.I需要验证树状
如果该节点的用于至少一个被选中并且不大于节点specfic（比如3个节点）的数量更多的用户可以选择。
注：树视图是一个asp.net树形（而不是一个Ajax TreeView控件）

The treeview has leaf node checkboxes.I need to validate the treeview if atleast one of the node is checked and not more than a specfic(say 3 nodes) number of nodes a user can select. Note:The Treeview is a asp.net treeview(not an ajax treeview)

推荐答案

好吧，因为你没有提到你想要什么类型的验证，我会做客户端端和服务器端。我的 TreeView控件被命名为 tvTest

首先，添加一个的CustomValidator 来你Asp.Net页：

Alright, since you didn't mentioned what type of validation you want, I'll do both client side and server side. My TreeView is named tvTest
First, add a CustomValidator to you Asp.Net page:

<asp:CustomValidator ID="CustomValidator1" runat="server" ClientValidationFunction="ClientValidate"
  ErrorMessage="CustomValidator" Display="Dynamic" OnServerValidate="CustomValidator1_ServerValidate">*</asp:CustomValidator>

注：没有设置的ControlToValidate
接下来，客户端验证添加这个脚本（也到你的Asp.Net页）：

Note: don't set the ControlToValidate property.
Next, add this script (also to your Asp.Net page) for client side validation:

<script type="text/javascript">

  function ClientValidate(source, arguments) {
    var treeView = document.getElementById("<%= tvTest.ClientID %>");
    var checkBoxes = treeView.getElementsByTagName("input");
    var checkedCount = 0;
    for (var i = 0; i < checkBoxes.length; i++) {
      if (checkBoxes[i].checked) {
        checkedCount++;
      }
    }
    if (checkedCount > 0 && checkedCount < 4) {
      arguments.IsValid = true;
    } else {
      arguments.IsValid = false;
    }
  }        

</script>

而在去年，这对于服务器端验证添加到您的code-背后：

And last, add this to your code-behind for server side validation:

protected void CustomValidator1_ServerValidate(object source, System.Web.UI.WebControls.ServerValidateEventArgs args) {
  if (tvTest.CheckedNodes.Count > 0 && tvTest.CheckedNodes.Count < 4) {
    args.IsValid = true;
  } else {
    args.IsValid = false;
  }
}

当然，你要改变的最小和节点的最大数量的用户可以检查限制。

Of course, you'll want to change the limits for the minimum and maximum number of nodes the user can check.

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