SharePoint提交前有效性验证

In this article we will see how to implement client side validation in SharePoint list with out using SharePoint designer.

For this follow the below steps

1. 找到需要有效性验证的页面，如NewForm.aspx或者EditForm.aspx
   在URL后面输入红色部分：(http://mysite/ Lists/job/NewForm.aspx?pageview=shared&toolpaneview=2)可以进入编辑模式.
2. 添加一个 “content editor web part” 并且修改这个web part，在代码视图中输入
3. Add the below script
   view sourceprint?

   1.<script language="javascript">

   2.function PreSaveAction()

   3.{

   4.//add your JavaScript code here and return true / false

   5.}

   6.</script>

如：

<script language="javascript">
function PreSaveAction()
{
//add your JavaScript code here and return true / false
      var elm2 = document.getElementById("idAttachmentsTable");
         if (elm2 == null || elm2.rows.length == 0)
{
                    alert('Please attach file!');
             return false;
}
                else
{
                    return true;  
}
}
</script>

 以上代码的作用为：在提交的时候验证附件是否为空，如果空，提示必须添加附件。

另外还可以通过http://www.codeplex.com/SPJsLib杜总发布的JS方案来检测。