【发布时间】：2015-11-27 06:07:19
【问题描述】：
我有一个搜索状态的搜索框，我的选择可以转移到另一个存储桶。我的目标是让用户能够在搜索他们感兴趣的状态时按 Enter 并将他们的结果推送到选择桶。例如，用户将 New Hampshire 放入搜索框中并按 Enter 键 - New Hampshire 从选择列表中消失并转移到选择桶中。目前，用户必须在搜索后双击 New Hampshire 才能将选择推送到另一个框。此外，如果新罕布什尔州被推送到选定的存储桶，它不会从选择列表中消失。
server.R
shinyServer(function(input, output, session) {
output$main <- renderUI({
source("chooser.R")
chooserInput("mychooser","Available frobs","Selected frobs",
row.names(USArrests),c(),size=20,multiple=TRUE)})
})
ui.R
source("chooser.R")
shinyUI(fluidPage(
uiOutput("main")
))
chooser.R
chooserInput <- function(inputId, leftLabel, rightLabel, leftChoices, rightChoices,
size = 5, multiple = FALSE) {
leftChoices <- lapply(leftChoices, tags$option)
rightChoices <- lapply(rightChoices, tags$option)
if (multiple)
multiple <- "multiple"
else
multiple <- NULL
tagList(
singleton(tags$head(
tags$script(src="chooser-binding.js"),
tags$style(type="text/css",
HTML(".chooser-container { display: inline-block; }")
)
)),
div(id=inputId, class="chooser",style="",
div(
div(style="min-width:100px;",
tags$input(type="text",class="chooser-input-search",style="width:100px;")
)
),
div(style="display:table",
div(style="min-width:100px; display:table-cell;",
div(class="chooser-container chooser-left-container",
style="width:100%;",
tags$select(class="left", size=size, multiple=multiple, leftChoices,style="width:100%;min-width:100px")
)
),
div(style="min-width:50px; display:table-cell;vertical-align: middle;",
div(class="chooser-container chooser-center-container",
style="padding:10px;",
icon("arrow-circle-o-right", "right-arrow fa-3x"),
tags$br(),
icon("arrow-circle-o-left", "left-arrow fa-3x")
)
),
div(style="min-width:100px; display:table-cell;",
div(class="chooser-container chooser-right-container", style="width:100%;",
tags$select(class="right", size=size, multiple=multiple, rightChoices,style="width:100%;")
)
)
)
)
)
}
registerInputHandler("shinyjsexamples.chooser", function(data, ...) {
if (is.null(data))
NULL
else
list(left=as.character(data$left), right=as.character(data$right))
}, force = TRUE)
chooser-bindings.js（在 www 文件夹中）
(function() {
var options = [];
jQuery.fn.filterByText = function(textbox, selectSingleMatch) {
return this.each(function() {
var select = this;
options = [];
$(select).find('option').each(function() {
options.push({value: $(this).val(), text: $(this).text()});
});
$(select).data('options', options);
$(textbox).bind('change keyup', function() {
options = $(select).empty().scrollTop(0).data('options');
var search = $.trim($(this).val());
var regex = new RegExp(search,'gi');
$.each(options, function(i) {
var option = options[i];
if(option.text.match(regex) !== null) {
$(select).append(
$('<option>').text(option.text).val(option.value)
);
}
});
if (selectSingleMatch === true &&
$(select).children().length === 1) {
$(select).children().get(0).selected = true;
}
});
});
};
function updateChooser(chooser) {
chooser = $(chooser);
var left = chooser.find("select.left");
var right = chooser.find("select.right");
var leftArrow = chooser.find(".left-arrow");
var rightArrow = chooser.find(".right-arrow");
var canMoveTo = (left.val() || []).length > 0;
var canMoveFrom = (right.val() || []).length > 0;
leftArrow.toggleClass("muted", !canMoveFrom);
rightArrow.toggleClass("muted", !canMoveTo);
}
function move(chooser, source, dest) {
chooser = $(chooser);
var selected = chooser.find(source).children("option:selected");
var dest = chooser.find(dest);
dest.children("option:selected").each(function(i, e) {e.selected = false;});
dest.append(selected);
updateChooser(chooser);
chooser.trigger("change");
}
$(".chooser").change(function(){
});
$(document).on("change", ".chooser select", function() {
updateChooser($(this).parents(".chooser"));
});
$(document).on("click", ".chooser .right-arrow", function() {
move($(this).parents(".chooser"), ".left", ".right");
});
$(document).on("click", ".chooser .left-arrow", function() {
move($(this).parents(".chooser"), ".right", ".left");
});
$(document).on("dblclick", ".chooser select.left", function() {
move($(this).parents(".chooser"), ".left", ".right");
});
$(document).on("dblclick", ".chooser select.right", function() {
move($(this).parents(".chooser"), ".right", ".left");
});
var binding = new Shiny.InputBinding();
binding.find = function(scope) {
return $(scope).find(".chooser");
};
binding.initialize = function(el) {
updateChooser(el);
$(function() {
$('.left').filterByText($('.chooser-input-search'), true);
});
};
binding.getValue = function(el) {
return {
left: $.makeArray($(el).find("select.left option").map(function(i, e) { return e.value; })),
right: $.makeArray($(el).find("select.right option").map(function(i, e) { return e.value; }))
}
};
binding.setValue = function(el, value) {
// TODO: implement
};
binding.subscribe = function(el, callback) {
$(el).on("change.chooserBinding", function(e) {
callback();
});
};
binding.unsubscribe = function(el) {
$(el).off(".chooserBinding");
};
binding.getType = function() {
return "shinyjsexamples.chooser";
};
Shiny.inputBindings.register(binding, "shinyjsexamples.chooser");
})();
如您所见，这几乎是可耻的复制和粘贴。
【问题讨论】：