[英]Read dynamic HTML elements using R
首先,我想说我对R完全陌生。我已经阅读了文档,找不到解决以下情况的方法:
我已经使用Google图表库(org-chart)制作了图表,并且可以正常工作。 事实是,当用户单击按钮或单击Enter时,层次结构中的每个节点都必须读取并发送给R的输入。 这是我的问题
我所做的只是测试:
library(shiny)
# Define server logic for random distribution application
shinyServer(function(input, output) {
output$num <- renderText ({
paste('Number has changed to : ', input$qty_1)
})
})
$ qty_1在哪里
<input name="qty_1" id="qty_1" value="10" type="number"></input>
但是没有运气。
PS我正在使用Shiny框架来开发后端。
我的HTML是
<html>
<head>
<script type="text/javascript" src="https://www.gstatic.com/charts/loader.js"></script>
<script type="text/javascript" src="https://code.jquery.com/jquery-2.2.0.min.js"></script>
<style type="text/css">
input[type="number"] {
background-color : #fdfdd2;
}
</style>
<script>
"use strict";
var tree = {
name: "ROOT",
desc: "Root",
qty : 0,
parent: '',
children: {
name: "FIRST",
desc: "first",
qty : 0,
parent: 'ROOT',
children: [{
name: "SECOND",
desc: "second",
qty : 0,
parent: 'FIRST',
children: {}
}, {
name: "THIRD",
desc: "third",
qty : 0,
parent: 'FIRST',
children: [{
name: "FOURTH",
desc: "fourth",
qty: 0,
parent: 'THIRD',
children:{}
},{
name: "FIFTH",
desc: "fifth",
qty : 0,
parent: 'THIRD',
children: [{
name: "SIXTH",
desc: "sixth",
qty : 0,
parent: 'FIFTH',
children: {}
}]
}]
}]
}
}
</script>
<script type="text/javascript">
google.charts.load('current', {packages:["orgchart"]});
google.charts.setOnLoadCallback(drawChart);
function drawChart() {
var data = new google.visualization.DataTable();
data.addColumn('string', 'Name');
data.addColumn('string', 'Desc');
data.addColumn('string', 'Qty');
// For each orgchart box, provide the name, description, and quantity to show.
addRows(data, tree);
// Create the chart.
var chart = new google.visualization.OrgChart(document.getElementById('chart_div'));
// Draw the chart, setting the allowHtml option to true for the tooltips.
chart.draw(data, { allowHtml: true });
}
function addRows(data, Tree) {
if (jQuery.isEmptyObject(Tree)) return;
appendToChart(data, Tree.name, Tree.desc, Tree.qty, Tree.parent);
var children = Tree.children;
if (Object.prototype.toString.call( children ) == '[object Array]'){ // more than 1 child
for (var i = children.length - 1; i >= 0; i--) {
addRows(data, children[i]);
}
}
else
{
addRows(data, children);
}
}
function appendToChart(data, name, desc, qty, parent) {
data.addRows([
//[name, parent, desc]
[{ v:name, f: name + '<div style="color:red; font-style:italic">' + desc +
'</div><input id="qty" size="4" value="' + qty + '" type="number"></input>' }, parent, desc]
]);
}
</script>
</head>
<body>
<div class="container-fluid">
<div class="row">
<div class="col-md-12">
<div id="chart_div"></div>
</div>
</div>
</div>
<script>
$(function(){
$(document).on('keypress', function(e) {
if (e.which == 13)
if ($.isNumeric($("#qty").val()))
alert($("#qty").val());
else
alert("not a number");
});
});
</script>
</body>
</html>
您可以尝试以下几种方法:
将Shiny.js添加到您的head
(我通常还会添加闪亮的jquery版本):
<script src="shared/jquery.js" type="text/javascript"></script>
<script src="shared/shiny.js" type="text/javascript"></script>
将数字输入包装在<div class="shiny-input-container">
以便server.R
将其识别为输入并将其绑定,它们将需要一个name属性,然后可以使用该属性在server.R
引用它们。 例如,您可以在addRows
函数中执行以下操作:
[{ v:name, f: name + '<div style="color:red; font-style:italic" >' + desc + '</div><div class="shiny-input-container"><input name="qty-'+name+'" size="4" value="' + qty + '" type="number"></input></div>' }, parent, desc]
drawChart
函数处调用Shiny.unbindAll()
,并在drawChart
调用Shiny.bindAll()
以使所有Shiny输入绑定正常工作。 然后,您可以在server.R中引用输入,它们都具有类似qty-name
,您可以通过执行grepl("qty",names(input))
其从输入列表中过滤掉。 例如,在server.R
打印所有您可以做的:
observe({
lapply(names(input)[grepl("qty",names(input))],function(x){
print(paste(x,input[[x]]))
})
})
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