[英]ASP.NET DropDownList JavaScript/jQuery getting selected value and populating items
我已經堅持了兩天了。 我最初使用HTMLSelect元素並獲得成功,直到我意識到我不知道如何通過后面的代碼為它們分配值。 這是使用HTMLSelect元素時的代碼,這些代碼使頁面元素的行為符合我想要的方式:
<select id="cboCountry" class="autoTBComplete"/>
<select id="cboState" class="autoTBComplete" />
<script type="text/javascript">
$(document).ready(function () {
$("#cboCountry").bind("change", ValidateCountryInput);
$("#cboState").bind("change", ValidateStateInput);
$.ajax({
type: "POST",
url: "AjaxService.asmx/GetCountryList",
contentType: "application/json; charset=utf-8",
data: "{}",
datatype:"json",
success: function (data) {
var d = data.d
$(d).each(function (i) {
$('#cboCountry').append("<option value=" + d[i] + ">" + d[i] + "</option>");
});
},
error: function (XMLHttpRequest, textStatus, errorThrown) {
alert(textStatus);
}
});
});
function ValidateCountryInput() {
if (CheckUSAorCAN()) {
$.ajax({
type: "POST",
url: "AjaxService.asmx/GetStateList",
contentType: "application/json; charset=utf-8",
data: "{}",
datatype: "json",
success: function (data) {
var d = data.d
$(d).each(function (i) {
$('#cboState').append("<option value=" + d[i] + ">" + d[i] + "</option>");
});
},
error: function (XMLHttpRequest, textStatus, errorThrown) {
alert(textStatus);
}
});
$("[id$='cboState']").attr('style', "background:#ffd1d1; box-shadow: 0 0 20px #ff7a7a; width:64%;");
}
else {
$("[id$='cboState']").val("");
$("[id$='cboState']").attr('style', "width:5%");
$("[id$='cboState']").classname ="autotbComplete";
};
};
function ValidateStateInput() {
var txt = $('#cboState').val();
if (CheckUSAorCAN()) {
if (txt.length > 0) {
$("[id$='cboState']").attr('style', "width:64%");
$("[id$='cboState']").classname = "autotbComplete";
}
else {
$("[id$='cboState']").attr('style', "background:#ffd1d1; box-shadow: 0 0 20px #ff7a7a; width:64%;");
}
}
else {
$("[id$='cboState']").attr('style', "background:#ffd1d1; box-shadow: 0 0 20px #ff7a7a; width:64%;");
};
}
function CheckUSAorCAN() {
var txt = $('#cboCountry').val();
txt = toAllCaps(txt);
txt = txt.replace("([^A-Z])+");
return "US" == txt || "USA" == txt || "UNITEDSTATES" == txt || "CANADA" == txt;
}
function toAllCaps(string) { //jQuery toUpperCase() doesn't work on strings for IE 6-10
if (string != null) {
var input = string.split("")
for (i = 0; i < input.length; i++) {
input[i] = string.charAt(i).toUpperCase()
};
return input.join("")
}
return string
};
完成該工作后,我意識到我在后面的代碼中存在問題,特別是在以下函數中,我在其中為元素分配值或從中獲取值。 我可以使用Response.Params從框中獲取值,但是不知道如何分配值或如何從后面的代碼中隱藏/禁用該字段,因為我無法在以下位置執行cboCountry.enabled = false從后面的代碼中選擇一個元素。 如果該元素是ASP.NET DropDownList,則該代碼有效(注意:我從該屬性中刪除了不相關的字段。cbo前綴是應用程序只是使用組合框的WinApp時的剩余值)。
Private Property InputFieldsControl As CustomerDataFields
Get
Dim cdf As New CustomerDataFields
cdf.Country = cboCountry.Text
cdf.State = cboState.Text
Return cdf
End Get
Set(ByVal cdf As CustomerDataFields)
If Not cboCountry.Items.Contains(New ListItem(cdf.Country)) Then
cboCountry.Items.Add(cdf.Country)
End If
cboCountry.Text = cdf.Country
If Not cboState.Items.Contains(New ListItem(cdf.State)) Then
cboState.Items.Add(cdf.State)
End If
cboState.Text = cdf.State
End Set
End Property
由於意識到HTMLSelect元素將無法與我后面的代碼一起使用。 我試圖使相同的網頁和javascript與DropDownLists一起使用,但沒有成功。 從上面更改的代碼如下。 注意這些評論,因為它們是新問題。 具體來說,事件未觸發,並且CheckUSAorCAN()不斷從cboCountry中檢索所選值的空值。
<asp:DropDownList Width="66%" CssClass="tbSkin" ID="cboCountry" runat="server" ></asp:DropDownList>
<asp:DropDownList Width="66%" CssClass="tbSkin" ID="cboState" runat="server" ></asp:DropDownList>
<script type="text/javascript">
$(document).ready(function () {
$.ajax({
type: "POST",
url: "AjaxService.asmx/GetCountryList",
contentType: "application/json; charset=utf-8",
data: "{}",
datatype:"json",
success: function (data) {
var d = data.d;
$(d).each(function (i) {
var ddlref = document.getElementById("cphContents_InputParams_cboCountry");
addItem(ddlref,d[i]);
});
},
error: function (XMLHttpRequest, textStatus, errorThrown) {
alert(textStatus);
}
});
$("#cboCountry").bind("change", onCountryChange); //does not bind or fire the event
$("#cboState").bind("change", onStateChange); //does not bind or fire the event
});
function onCountryChange(e) {
if (CheckUSAorCAN()) {
$.ajax({
type: "POST",
url: "AjaxService.asmx/GetStateList",
contentType: "application/json; charset=utf-8",
data: "{}",
datatype: "json",
success: function (data) {
var d = data.d;
$(d).each(function (i) {
var ddlref = document.getElementById("cphContents_InputParams_cboState");
addItem(ddlref, d[i]);
});
},
error: function (XMLHttpRequest, textStatus, errorThrown) {
alert(textStatus);
}
});
$("[id$='cboState']").attr('style', "background:#ffd1d1; box-shadow: 0 0 20px #ff7a7a; width:64%;");
}
else {
$("[id$='cboState']").val("");
$("[id$='cboState']").attr('style', "width:5%");
$("[id$='cboState']").classname = "autotbComplete";
};
};
function onStateChange(e) {
var txt = $('#cboState').val();
if (CheckUSAorCAN()) {
if (txt.length > 0) {
$("[id$='cboState']").attr('style', "width:64%");
$("[id$='cboState']").classname = "autotbComplete";
}
else {
$("[id$='cboState']").attr('style', "background:#ffd1d1; box-shadow: 0 0 20px #ff7a7a; width:64%;");
};
}
else {
$("[id$='cboState']").attr('style', "background:#ffd1d1; box-shadow: 0 0 20px #ff7a7a; width:64%;");
};
};
function CheckUSAorCAN() {
var txt = $('#cboCountry').val();
var e = document.getElementById("cphContents_InputParams_cboState");
var index = e.selectedIndex; //does not work
var strUser = e.options[e.selectedIndex]; //does not work
if (txt != null) { //always comes up null
txt = toAllCaps(txt);
txt = txt.replace("([^A-Z])+");
return "US" == txt || "USA" == txt || "UNITEDSTATES" == txt || "CANADA" == txt;
}
return false;
};
function addItem(ddlref, item) {
var option1 = document.createElement("option");
option1.text = item;
option1.value = item;
ddlref.options.add(option1);
};
因為通過jQuery綁定后change事件沒有觸發,所以將它們綁定在標記代碼中,如下所示:
<asp:DropDownList Width="66%" CssClass="autoTBComplete" ID="cboCountry" runat="server" onchange="onCountryChange()"></asp:DropDownList>
但是,現在onCountryChange()確實可以觸發,但是cboCountry中的值作為CheckUSAorCAN()函數的內容返回為零。
我沒主意了。 我該如何工作?
編輯:如果我在HTMLSelect標記上設置了runat =“ server”,以便可以從后面的代碼訪問它,則它與DropDownList的作用相同,除非我在標記內設置onchange事件,否則該事件將不會觸發。 然后所選值每次都為null,就像DropDownList一樣
終於成功了。 我為jQuery使用類名而不是ID。 這是工作代碼,供將來參考,以及其他來自Google的代碼。
標記:
<select name="cboCountry" id="cboCountry" class="autoTBComplete cboCountry" runat="server" />
<select id="cboState" name="cboState" class="autoTBComplete cboState" runat="server" />
腳本:
<script type="text/javascript">
$(document).ready(function () {
$(".cboCountry").bind("change", ValidateCountryInput);
$(".cboState").bind("change", ValidateStateInput);
$.ajax({
type: "POST",
url: "AjaxService.asmx/GetCountryList",
contentType: "application/json; charset=utf-8",
data: "{}",
datatype: "json",
success: function (data) {
var d = data.d
$(d).each(function (i) {
$(".cboCountry").append("<option value=" + d[i] + ">" + d[i] + "</option>");
});
},
error: function (XMLHttpRequest, textStatus, errorThrown) {
alert(textStatus);
}
});
});
function ValidateCountryInput() {
if (CheckUSAorCAN()) {
$.ajax({
type: "POST",
url: "AjaxService.asmx/GetStateList",
contentType: "application/json; charset=utf-8",
data: "{}",
datatype: "json",
success: function (data) {
var d = data.d
$(d).each(function (i) {
$(".cboState").append("<option value=" + d[i] + ">" + d[i] + "</option>");
});
},
error: function (XMLHttpRequest, textStatus, errorThrown) {
alert(textStatus);
}
});
$(".cboState").attr('style', "background:#ffd1d1; box-shadow: 0 0 20px #ff7a7a; width:64%;");
}
else {
$(".cboState").val("");
$(".cboState").attr('style', "width:5%");
$(".cboState").classname = "autotbComplete";
};
};
function ValidateStateInput() {
var txt = $('.cboState').val();
if (CheckUSAorCAN()) {
if (txt.length > 0) {
$(".cboState").attr('style', "width:64%");
$(".cboState").classname = "autotbComplete";
}
else {
$(".cboState").attr('style', "background:#ffd1d1; box-shadow: 0 0 20px #ff7a7a; width:64%;");
}
}
else {
$(".cboState").attr('style', "background:#ffd1d1; box-shadow: 0 0 20px #ff7a7a; width:64%;");
};
}
背后的代碼:
Protected WithEvents cboCountry As Global.System.Web.UI.HtmlControls.HtmlSelect
Protected WithEvents cboState As Global.System.Web.UI.HtmlControls.HtmlSelect
Private Property InputFieldsControl As CustomerDataFields
Get
Dim cdf As New CustomerDataFields
cdf.Country = Request.Params("ctl00$cphContents$InputParams$cboCountry")
cdf.State = Request.Params("ctl00$cphContents$InputParams$cboState")
Return cdf
End Get
Set(ByVal cdf As CustomerDataFields)
If Not cboCountry.Items.Contains(New ListItem(cdf.Country)) Then
cboCountry.Items.Add(cdf.Country)
End If
cboCountry.SelectedIndex = GetHTMLSelectIndex(cboCountry, cdf.Country)
If Not cboState.Items.Contains(New ListItem(cdf.State)) Then
cboState.Items.Add(cdf.State)
End If
cboState.SelectedIndex = GetHTMLSelectIndex(cboState, cdf.State)
End Set
End Property
Private Function GetHTMLSelectIndex(elem As HtmlSelect, value As String) As Integer
Return elem.Items().IndexOf(elem.Items.FindByText(value))
End Function
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