use*_*232 5 c# asp.net webforms drop-down-menu
我需要创建一个下拉列表，用户可以在其中从下拉列表中选择一个值或输入该值。
就像下面链接中的“你来自哪里？”下拉菜单一样：
http://www.dhtmlgoodies.com/scripts/form_widget_editable_select/form_widget_editable_select.html
我知道这是一个常见问题，并且在堆栈溢出方面也有类似的查询，但我找不到一个简单的工作解决方案。
我参考了以下链接：
http://www.codeproject.com/Articles/8578/Editable-Dropdown-DHTML-Behavior http://www.codeproject.com/Articles/290218/Custom-ASP-NET-Editable-DropDownList http://codeverge。 com/asp.net.web-forms/editable-dropdown-list-c/392261
有没有人以前做过这方面的工作，并让我知道如何继续？
您可以尝试使用 JqueryUI 自动完成组合框。
它可以让您输入文本并从下拉列表中选择您选择的项目。
作为一项额外功能，它允许您使用自动完成功能来获得增强的 UI 体验。
我附上一个与 bootstrap 3.3.4 相结合的演示
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css" rel="stylesheet" />
<link href="https://code.jquery.com/ui/1.11.4/themes/smoothness/jquery-ui.css" rel="stylesheet" />
<script src="https://code.jquery.com/jquery-1.10.2.js"></script>
<script src="https://code.jquery.com/ui/1.11.4/jquery-ui.js"></script>
<link href="https://jqueryui.com/resources/demos/style.css" rel="stylesheet" />
<style>
.custom-combobox {
position: relative;
display: inline-block;
}
.custom-combobox-toggle {
position: absolute;
top: 0;
bottom: 0;
margin-left: -1px;
padding: 0;
}
.custom-combobox-input {
margin: 0;
padding: 5px 10px;
}
.ui-state-default,
.ui-widget-content .ui-state-default,
.ui-widget-header .ui-state-default {
border: 1px solid #421D1D;
background: #ffffff url("images/ui-bg_glass_75_e6e6e6_1x400.png") 50% 50% repeat-x !important;
font-weight: normal;
color: #555555;
}
/* Corner radius */
.ui-corner-all,
.ui-corner-top,
.ui-corner-left,
.ui-corner-tl {
border-top-left-radius: 0px !important;
}
.ui-corner-all,
.ui-corner-top,
.ui-corner-right,
.ui-corner-tr {
border-top-right-radius: 0px !important;
}
.ui-corner-all,
.ui-corner-bottom,
.ui-corner-left,
.ui-corner-bl {
border-bottom-left-radius: 0px !important;
}
.ui-corner-all,
.ui-corner-bottom,
.ui-corner-right,
.ui-corner-br {
border-bottom-right-radius: 0px !important;
}
</style>
<script>
(function($) {
$.widget("custom.combobox", {
_create: function() {
this.wrapper = $("<span>")
.addClass("custom-combobox")
.insertAfter(this.element);
this.element.hide();
this._createAutocomplete();
this._createShowAllButton();
},
_createAutocomplete: function() {
var selected = this.element.children(":selected"),
value = selected.val() ? selected.text() : "";
this.input = $("<input>")
.appendTo(this.wrapper)
.val(value)
.attr("title", "")
.addClass("custom-combobox-input ui-widget ui-widget-content ui-state-default ui-corner-left")
.autocomplete({
delay: 0,
minLength: 0,
source: $.proxy(this, "_source")
})
.tooltip({
tooltipClass: "ui-state-highlight"
});
this._on(this.input, {
autocompleteselect: function(event, ui) {
ui.item.option.selected = true;
this._trigger("select", event, {
item: ui.item.option
});
},
autocompletechange: "_removeIfInvalid"
});
},
_createShowAllButton: function() {
var input = this.input,
wasOpen = false;
$("<a>")
.attr("tabIndex", -1)
.attr("title", "Show All Items")
.tooltip()
.appendTo(this.wrapper)
.button({
icons: {
primary: "ui-icon-triangle-1-s"
},
text: false
})
.removeClass("ui-corner-all")
.addClass("custom-combobox-toggle ui-corner-right")
.mousedown(function() {
wasOpen = input.autocomplete("widget").is(":visible");
})
.click(function() {
input.focus();
// Close if already visible
if (wasOpen) {
return;
}
// Pass empty string as value to search for, displaying all results
input.autocomplete("search", "");
});
},
_source: function(request, response) {
var matcher = new RegExp($.ui.autocomplete.escapeRegex(request.term), "i");
response(this.element.children("option").map(function() {
var text = $(this).text();
if (this.value && (!request.term || matcher.test(text)))
return {
label: text,
value: text,
option: this
};
}));
},
_removeIfInvalid: function(event, ui) {
// Selected an item, nothing to do
if (ui.item) {
return;
}
// Search for a match (case-insensitive)
var value = this.input.val(),
valueLowerCase = value.toLowerCase(),
valid = false;
this.element.children("option").each(function() {
if ($(this).text().toLowerCase() === valueLowerCase) {
this.selected = valid = true;
return false;
}
});
// Found a match, nothing to do
if (valid) {
return;
}
// Remove invalid value
this.input
.val("")
.attr("title", value + " didn't match any item")
.tooltip("open");
this.element.val("");
this._delay(function() {
this.input.tooltip("close").attr("title", "");
}, 2500);
this.input.autocomplete("instance").term = "";
},
_destroy: function() {
this.wrapper.remove();
this.element.show();
}
});
})(jQuery);
$(function() {
$("#combobox").combobox();
$("#toggle").click(function() {
$("#combobox").toggle();
});
});
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<div class="ui-widget">
<select id="combobox" class="form-control">
<option value="">Select your option</option>
<option value="Apple">Apple</option>
<option value="Banana">Banana</option>
<option value="Cherry">Cherry</option>
<option value="Date">Date</option>
<option value="Fig">Fig</option>
<option value="Grape">Grape</option>
<option value="Kiwi">Kiwi</option>
<option value="Mango">Mango</option>
<option value="Orange">Orange</option>
<option value="Pumpkin">Pumpkin</option>
<option value="Strawberry">Strawberry</option>
<option value="Tomato">Tomato</option>
<option value="Watermelon">Watermelon</option>
</select>
</div>
</div>
</form>
</body>
</html>希望这能解决您的问题。