jquery dropdownlist

不管上层用什么复杂的，我觉得.net里面既然jquery已经成为自带，那还是有必要了解jquery 的，哪怕最基础的一套

关于下拉框，首先是访问问题，看到这种#ID subProperty的方式 然后 .each()，然后function(){}语法看起来挺自然的

jQuery: Dynamically updating a drop down list事实上这个不是个煎蛋的事情

$('#DropDownList1 option').each(function()
{
        var option = this;
});

add CSS selectors to the options that we wanted to hide. That worked fine in Chrome and Firefox but Internet Explorer seems to ignore CSS selectors inside a drop down list so none of the options were being hidden.看起来可以实现的方法很多，但汪汪考虑到多个浏览器之后，解决方法就很少了。

<select id="foo" name="foo">
<option value="A" selected="selected">A</option>
<option value="B">B</option>
<option value="C">C</option>
<option value="Not applicable">Not applicable</option>
</select>

var originalFooOptions = $("#foo > option");

用这个方法》获得当前所有选项，是个数组//

文本框 var dependentfiled=$("#fildedFooIsedit");

dependentField

foo.empty();
	$(originalFooOptions).each(function() {
		var newOption = $(this).clone();
		if ($(this).val() === dependentField.val()) {
			newOption.attr("selected", "selected");
		}
		newOption.appendTo(foo);
	});

//string trim() jquery采用一下方式调用

becomes:

var cleaned = $.trim(ourString);

<script type="text/javascript">
    $(document).ready(function () {
        var data = { 'Country': 'India', 'Country1': 'USA', 'Country2': 'UK',

 'Country3': 'Rusia', 'Country4': 'France' };
        var s = $('<select />');-------选择到 下拉况，这是创建。。 。。
        for (var val in data) {

            $('<option />', { value: val, text: data[val] }).appendTo(s);
        }
        s.appendTo('body');
    });
</script>

＝＝＝

The problem was due to controls which were copy/pasted and did not have unique ID's 

＝＝＝selector

JQuery: var ddlCollection = $("select[name$='ddlDynamicDropDown']")

          ListItem[] items = new ListItem[3];
           items[0] = new ListItem("One", "1");
           items[1] = new ListItem("Two", "2");
           items[2] = new ListItem("Three", "3");
   
           DropDownList1.Items.AddRange(items);
           DropDownList1.DataBind();

／／－－－－／／－－－－／／－－－－－－－／／控制 Func < UserData,ActionResult >

public class SomeController
{
	private Dictionary<string, Func<UserData,ActionResult>> handleAction = 
		new Dictionary<string, Func<UserData,ActionResult>>
		{ { "Back", SaveAction },
		  { "Next", NextAction },
		  { "Save", SaveAction } };
 
	public ActionResult TheAction(string whichButton, UserData userData)
	{
		if(handleAction.ContainsKey(whichButton))
		{
			return handleAction[whichButton](userData);
		}
 
		throw Exception("");
	}
 
	private ActionResult NextAction(UserData userData)
	{
		// do cool stuff
	}
}