我尝试创建一个双列表框,将项目从一个列表框移动到另一个列表框,然后最终将数据从列表传递回 Controller 。
作为一名 javascript 新手,我在数据绑定(bind)方面遇到了困难。为了将数据从一个列表框移动到另一个列表框,我创建了以下表单:
<div class="container">
<form role="form">
<div class="container">
<div class="row">
<div class="col-md-5">
<div class="form-group">
<label for="SelectLeft">User Access:</label>
<select class="form-control" id="SelectLeft" multiple="multiple" data-bind="options : ownership, optionsText:function(item) { return item.FirstName + ' ' + item.LastName}, value:selectedItem">
@*<select class="form-control" id="SelectLeft" multiple="multiple">
</select>
</div>
</div>
<div class="col-md-2">
<div class="btn-group-vertical">
<input class="btn btn-primary" id="MoveLeft" type="button" value=" << " data-bind="click: addItem" />
<input class="btn btn-primary" id="MoveRight" type="button" value=" >> " data-bind="click: removeSelected" />
</div>
</div>
<div class="col-md-5">
<div class="form-group">
<label for="SelectRight">Owners:</label>
<select class="form-control" multiple="multiple" id="SelectRight" data-bind="options : availableOwners, optionsText:function(item) { return item.FirstName + ' ' + item.LastName}, value:selectedItem">
</select>
</div>
</div>
</div>
</div>
<button type="submit" class="btn btn-default" value="Cancel" name="addEditUser" id="btnCancel" data-bind="click: cancel">Cancel</button>
<button type="submit" class="btn btn-default" value="Submit" name="addEditUser" id="btnSubmit" data-bind="click: submit">Save</button>
</form>
</div>
<script>
var data=@(Html.Raw(Newtonsoft.Json.JsonConvert.SerializeObject(Model)));
var owners = @Html.Raw(Newtonsoft.Json.JsonConvert.SerializeObject(ViewBag.AccessOwners));
var availableOwners = @Html.Raw(Newtonsoft.Json.JsonConvert.SerializeObject(ViewBag.owners));
function viewModel() {
this.username=ko.observable(data.Username);
this.password=ko.observable(data.Password);
this.email=ko.observable(data.Email);
this.isActive=ko.observable(data.IsActive);
this.userId = ko.observable(data.UserId);
this.ownership=ko.observable(owners);
this.availableOwners = ko.observable(availableOwners)
this.selectedItem = ko.observable();
this.submit = function()
{
$.ajax({
url: '@Url.Action("UserSave", "Admin")',
type: 'POST',
data: ko.toJSON(this),
contentType: 'application/json',
});
window.location.href = url;
return false;
}
this.cancel = function()
{
window.location.href = url;
return false;
}
this.addItem = function () {
if ((this.selectedItem() != "") && (this.ownership.indexOf(this.selectedItem()) < 0))
{
// Prevent blanks and duplicates
this.ownership.push(this.selectedItem());
this.availableOwners.removeAll(this.selectedItem());
}
this.selectedItem(""); // Clear the text box
};
this.removeSelected = function () {
if ((this.selectedItem() != "") && (this.availableOwners.indexOf(this.selectedItem()) < 0))
{
this.ownership.removeAll(this.selectedItems());
this.availableOwners.push(this.selectedItem());
}
this.selectedItem("");
};
this.sortItems = function() {
this.ownership.sort();
this.availableOwners.sort();
};
};
ko.applyBindings(new viewModel());
var url = $("#RedirectTo").val();
当我点击 MoveLeft 或 MoveRight 按钮时,出现以下错误:
Uncaught TypeError: undefined is not a function
(anonymous function)
jQuery.event.dispatch
elemData.handle
有谁知道如何将选定的值从列表框传递到 addItem 或 removeItem 函数,以便在列表所有权中添加或删除对象?
谢谢!
最佳答案
嗯 niko
继续使用 Javascript,尤其是 ko 会很有趣
我 fork 了你们中的一些代码,以便让你们更好地理解事情。
除了亲爱的 Wayne Ellery
提到的原因之外,您还缺少一些东西,例如您必须使用 selectedOptions
当有机会选择多个列表项时
您给我们的错误 undefined is not a function
是因为您正在选择多个列表项并尝试推送它,这并不完全是 ko
Push 的工作方式,而不是您必须循环并执行它。
在此处检查选定选项 Documentation
有一把 fiddle 总是好的。我们来检查一下工作 fiddle here
不需要像您为click
给出的那样执行额外的逻辑,它可以以简单可读的方式完成 fiddle 中提供的所有内容
查看模型:
var vm=function() {
var self=this;
//observable's declaration
self.addItem = function () {
ko.utils.arrayForEach(self.selectedItem1(),function(item){
self.availableOwners.push(item);
self.ownership.remove(item);
});
}
self.removeSelected = function () {
ko.utils.arrayForEach(self.selectedItem2(),function(item){
self.ownership.push(item);
self.availableOwners.remove(item)
});
};
};
ko.applyBindings(new vm());
查看:
<select multiple="multiple" data-bind="options : ownership, optionsText:function(item) { return item.FirstName() + ' ' + item.LastName()}, selectedOptions:selectedItem1"></select>
<input class="btn btn-primary" id="MoveLeft" type="button" value=" << " data-bind="click:removeSelected,enable:selectedItem2" />
如有任何问题请联系我们。
关于javascript - 无法绑定(bind)列表框中选定的值,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/27753925/