我现在知道如何在 JavaScript 和 ASP.Net (VB.Net) 中使用页面方法,但它仅限制我进行单次插入。我的问题是当我将 GridView 中的列项目批量插入数据库时。它不起作用,不幸的是,它没有说任何错误。这是我到目前为止所拥有的:
服务器端代码(VB)
<WebMethod()> _
<ScriptMethod()> _
Public Shared Sub SavetoDB(ByVal ans As Answers)
Dim constr As String = ConfigurationManager.ConnectionStrings("CCQTConnectionString").ConnectionString
Using con As New SqlConnection(constr)
Using cmd As New SqlCommand("INSERT INTO tblApplicantAns (Appnr, QID, answer) VALUES(@Appnr, @QID, @ans)")
cmd.CommandType = CommandType.Text
cmd.Parameters.AddWithValue("@Appnr", ans.appnr)
cmd.Parameters.AddWithValue("@QID", ans.qid)
cmd.Parameters.AddWithValue("@ans", ans.ans)
cmd.Connection = con
con.Open()
cmd.ExecuteNonQuery()
con.Close()
End Using
End Using
End Sub
Public Class Answers
Public Property qid() As String
Get
Return _qid
End Get
Set(ByVal value As String)
_qid = value
End Set
End Property
Private _qid As String
Public Property ans() As String
Get
Return _ans
End Get
Set(ByVal value As String)
_ans = value
End Set
End Property
Private _ans As String
Public Property appnr() As String
Get
Return _appnr
End Get
Set(ByVal value As String)
_appnr = value
End Set
End Property
Private _appnr As String
JavaScript (AJAX)
$(function () {
var gvDrv = document.getElementById("<%= grdQ.ClientID %>");
for (i=1; i<gvDrv.rows.length; i++)
{
var cell = gvDrv.rows[i].cells;
var q = cell[0].innerHTML;
var a = cell[1].innerHTML;
$("[id*=Button1]").bind("click", function () {
var ans = {};
ans.appnr = $("[id*=TextBox1]").val();
ans.qid = $(" + q + ").val();
ans.ans = $(" + a + ").val();
$.ajax({
type: "POST",
url: "English.aspx/SavetoDB",
data: '{ans: ' + JSON.stringify(ans) + '}',
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function (response) {
alert("Time is up! Exam will proceed to next module.");
window.location = "Conf_English.aspx";
}
});
return false;
});
});
}
最佳答案
由于整个网格只有一个保存按钮,因此您的客户端脚本逻辑是倒退的。您将希望在按钮的单击事件处理程序中循环遍历网格的每一行,而不是相反;像这样:
$(document).ready(function() {
$("[id*=Button1]").bind("click", function() {
var gvDrv = document.getElementById("<%= grdQ.ClientID %>");
for (i = 1; i < gvDrv.rows.length; i++) {
var cell = gvDrv.rows[i].cells;
var q = cell[0].innerHTML;
var a = cell[1].innerHTML;
var ans = {};
ans.appnr = $("[id*=TextBox1]").val();
ans.qid = $(" + q + ").val();
ans.ans = $(" + a + ").val();
$.ajax({
type: "POST",
url: "English.aspx/SavetoDB",
data: '{ans: ' + JSON.stringify(ans) + '}',
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function (response) {
alert("Time is up! Exam will proceed to next module.");
window.location = "Conf_English.aspx";
}
});
}
return false;
});
});
现在,您不需要为网格中的每一行调用页面方法,而是需要将值数组而不是单个值传递给服务器端 ASP.NET AJAX 页面方法。为了利用您已经定义的 Answers
类,我们可以构建一个 JavaScript 对象数组,这些对象的属性值与您的类中的属性名称相匹配(即 qid
、ans
等);像这样:
$(document).ready(function() {
$("[id*=Button1]").bind("click", function() {
var gvDrv = document.getElementById("<%= grdQ.ClientID %>");
// Create array to hold x number of Answers instances
var answers = new Array();
// Loop through rows of grid
for (i = 1; i < gvDrv.rows.length; i++) {
var cell = gvDrv.rows[i].cells;
var q = cell[0].innerHTML;
var a = cell[1].innerHTML;
// Build one answer object per row
var ans = {};
ans.appnr = $("[id*=TextBox1]").val();
ans.qid = $(" + q + ").val();
ans.ans = $(" + a + ").val();
// Add single answer to array of answer objects
answers.push(ans);
}
// Make one call to ASP.NET AJAX Page Method passing in array of answer values
$.ajax({
type: "POST",
url: "English.aspx/SavetoDB",
data: '{ans: ' + JSON.stringify(answers) + '}',
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function (response) {
alert("Time is up! Exam will proceed to next module.");
window.location = "Conf_English.aspx";
}
});
return false;
});
});
最后,在 ASP.NET AJAX 页面方法的服务器端,您需要处理 Answers
对象列表,而不是单个 Answers
对象,如下所示:
<WebMethod()> _
<ScriptMethod()> _
Public Shared Sub SavetoDB(ByVal ans As List(Of Answers))
Dim constr As String = ConfigurationManager.ConnectionStrings("CCQTConnectionString").ConnectionString
' Loop through each Answers object here
For Each answer As Answers In ans
Using con As New SqlConnection(constr)
Using cmd As New SqlCommand("INSERT INTO tblApplicantAns (Appnr, QID, answer) VALUES(@Appnr, @QID, @ans)")
cmd.CommandType = CommandType.Text
cmd.Parameters.AddWithValue("@Appnr", answer.appnr)
cmd.Parameters.AddWithValue("@QID", answer.qid)
cmd.Parameters.AddWithValue("@ans", answer.ans)
cmd.Connection = con
con.Open()
cmd.ExecuteNonQuery()
con.Close()
End Using
End Using
Next
End Sub
关于JavaScript、页面方法和 Gridview,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/20062082/