C#Asp.net自定义控件的Javascript闭包
Javascript Closure for C# Asp.net Custom Control
我有一个自定义的Asp.net控件作为
public class ImageControl : Panel
{
private RadAsyncUpload AsyncUpload;
}
页面上的多个ImageControls应该使用JS对象的本地实例,所以我将它们包装在对象(闭包)中:
JS>
Type.registerNamespace("MyControls.ImageControl");
MyControls.ImageControl = function () {
this._filesUploaded = 0;
this._maxFileCount = 1;
};
MyControls.ImageControl.prototype = {
inc_filesUploaded: function () {
this._filesUploaded++;
},
FileSelected: function (sender, args) {
inc_filesUploaded();
}
};
MyControls.ImageControl.registerClass('MyControls.ImageControl');
ASP.NET>
protected override void Render(HtmlTextWriter writer)
{
Page.ClientScript.RegisterClientScriptResource(_TYPE, JS.ImageControl);
writer.Write(@"
<script type=""text/javascript"" id=""" + ClientID + @"ScriptHost"">
(function( ) {
var onLoad = function( ) {
window." + ID + @" = new MyControls.ImageControl();
};
if (window.addEventListener) {
window.addEventListener('load', onLoad, false);
}
else if (window.attachEvent) {
window.attachEvent('onload', onLoad);
}
})( );
</script>
");
base.Render(writer);
}
www.asp.net/AAJX/Documentation/Live/tutorials/CreatingCustomClientControlsTutorial.aspx
stackoverflow.com/questions/6309947/javascript-closure-advantages
http://www.codeproject.com/Articles/55414/From-Simple-JavaScript-Classes-to-ASP-NET-AJAX-Con
http://www.netfxharmonics.com/2008/11/Creating-JavaScript-Components-and-ASPNET-Controls
?:我得到错误MyControls.ImageControl不是构造函数:是否可以将这些"打包"函数分配为的事件处理程序
AsyncUpload.OnClientFileSelected = "FileSelected";
在"AJAX服务器控制项目"中,自定义类从ScriptControl继承,我还可以使用高级包装"面板"吗?
如有任何建议,不胜感激。
步骤1。正确添加IScriptControl接口,如下所示:[1]http://vincexu.blogspot.com/2010/02/aspnet-ajax-scriptcontrol-tutorial.html现在JS部分正在加载。
步骤2。将var传递到JS>
this.AsyncUpload = null; // in MyControls.ImageControl = function () { }
将其设置为代码隐藏。。在GetScriptDescriptors()中
descriptor.AddProperty("AsyncUpload", this.AsyncUpload.ClientID);
步骤3。在原型中创建委托:
this._FileSelected = Function.createDelegate(this, this.FileSelected);
并在DOM就绪时添加执行:
this.addLoadEvent(this._FileSelected);
其中
addLoadEvent: function(func) {
var oldonload = window.onload;
if (typeof window.onload != 'function') {
window.onload = func;
} else {
window.onload = function() {
if (oldonload) {
oldonload();
}
func();
}
重点是将EventHandlers分配给子控件应该在它们初始化后完成。
==========================CS===
public class ServerControl1 : Panel, IScriptControl
{
private RadAsyncUpload AsyncUpload;
public ServerControl1()
{
ID = Guid.NewGuid().ToString();
AsyncUpload = new RadAsyncUpload();
}
protected override void OnInit(EventArgs e)
{
Page.ClientScript.RegisterClientScriptResource(GetType(), "ImageControl.jquery.min.js");
Controls.Add(AsyncUpload);
base.OnInit(e);
}
protected override void OnPreRender(EventArgs e)
{
var manager = ScriptManager.GetCurrent(Page);
if (manager == null)
{
throw new InvalidOperationException("A ScriptManager is required on the page.");
}
manager.RegisterScriptControl(this);
base.OnPreRender(e);
}
protected override void Render(HtmlTextWriter writer)
{
if (!DesignMode)
ScriptManager.GetCurrent(Page).RegisterScriptDescriptors(this);
base.Render(writer);
}
public IEnumerable<ScriptDescriptor> GetScriptDescriptors()
{
var descriptor = new ScriptControlDescriptor("ImageControl.ClientControl1", this.ClientID);
descriptor.AddProperty("AsyncUpload", this.AsyncUpload.ClientID);
yield return descriptor;
}
public IEnumerable<ScriptReference> GetScriptReferences()
{
yield return new ScriptReference("ImageControl.ClientControl1.js", GetType().Assembly.FullName);
}
}
==========================JS===
Type.registerNamespace("ImageControl");
ImageControl.ClientControl1 = function (element) {
ImageControl.ClientControl1.initializeBase(this, [element]);
this.AsyncUpload = null;
}
ImageControl.ClientControl1.prototype = {
initialize: function () {
ImageControl.ClientControl1.callBaseMethod(this, 'initialize');
this._Added = Function.createDelegate(this, this.Added);
this._initAsyncClientFunctions = Function.createDelegate(this, this.initAsyncClientFunctions);
this.addLoadEvent(this._initAsyncClientFunctions);
},
dispose: function () {
ImageControl.ClientControl1.callBaseMethod(this, 'dispose');
},
addLoadEvent: function(func) {
var oldonload = window.onload;
if (typeof window.onload != 'function') {
window.onload = func;
} else {
window.onload = function() {
if (oldonload) {
oldonload();
}
func();
}
}
},
initAsyncClientFunctions: function()
{
var asyncUpload = $find(this.AsyncUpload);
asyncUpload.add_added(this._Added);
},
Added: function () {
alert('added ' + this.AsyncUpload);
},
};
ImageControl.ClientControl1.registerClass('ImageControl.ClientControl1', Sys.UI.Control);
if (typeof (Sys) !== 'undefined') Sys.Application.notifyScriptLoaded();
结束。
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