你好， 我试图通过PhoneGap桌面应用程序呈现一个简单的两个框架页面。由表格构成的底部框架在任何地方都正确显示，相反，当我连接到它的网络版本时，在我的计算机和iPhone上，当我尝试访问它时，应该显示图形的顶部框架正确显示通过PhoneGap应用程序或iPhone上的Safari连接到本地出版物，顶部屏幕完全空白。 我正在使用NVD3库来绘制图形，我通过Ajax为它们加载数据。可能是什么问题，我该如何调试它？这是页面的代码;提供网页是本地的，因此您可能无法正确执行它：
<!DOCTYPE html>
<html>
<head>
<style>
text {
font: 12px sans-serif;
}
svg {
display: block;
height: 75%;
}
html, body, #chart1, svg {
margin: 0px;
padding: 0px;
height: 100%;
width: 100%;
}
.dashed {
stroke-dasharray: 5,5;
}
</style>
<meta charset="utf-8">
<link href="../build/nv.d3.css" rel="stylesheet" type="text/css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.2/d3.min.js" charset="utf-8"></script>
<script src="../build/nv.d3.js"></script>
<link href="drawer.css" rel="stylesheet" type="text/css">
<!-- <script async src="https://production-assets.codepen.io/assets/embed/ei.js"></script> -->
<meta name="format-detection" content="telephone=no" />
<meta name="msapplication-tap-highlight" content="no" />
<meta name="viewport" content="user-scalable=no, initial-scale=1, maximum-scale=1, minimum-scale=1, width=device-width" />
<!-- This is a wide open CSP declaration. To lock this down for production, see below. -->
<!-- <meta http-equiv="Content-Security-Policy" content="default-src * 'unsafe-inline'; style-src 'self' 'unsafe-inline'; media-src *" /> -->
<!-- Good default declaration:
* gap: is required only on iOS (when using UIWebView) and is needed for JS->native communication
* https://ssl.gstatic.com is required only on Android and is needed for TalkBack to function properly
* Disables use of eval() and inline scripts in order to mitigate risk of XSS vulnerabilities. To change this:
* Enable inline JS: add 'unsafe-inline' to default-src
* Enable eval(): add 'unsafe-eval' to default-src
* Create your own at http://cspisawesome.com
-->
<meta http-equiv="Content-Security-Policy" content="default-src 'self' data: gap: 'unsafe-inline' https://ssl.gstatic.com; style-src 'self' 'unsafe-inline'; media-src *" />
<link rel="stylesheet" type="text/css" href="css/index.css" />
</head>
<body class='with-3d-shadow with-transitions'">
<input type="checkbox" id="drawer-toggle" name="drawer-toggle"/>
<label for="drawer-toggle" id="drawer-toggle-label"></label>
<header>Select</header>
<nav id="drawer">
<div id="list">
</div>
</nav>
<div id="page-content">
<div id="chart1"></div>
<script>
var chart;
var data;
var hiddenGraphNames=[];
nv.addGraph(function() {
alert("nv");
loadJSON(function(response) {
loadPipeNames(response);
chart = nv.models.lineChart()
.options({
duration: 300,
useInteractiveGuideline: true
})
;
// chart sub-models (ie. xAxis, yAxis, etc) when accessed directly, return themselves, not the parent chart, so need to chain separately
chart.xAxis
.axisLabel("Time (s)")
.tickFormat(d3.format(',.1f'))
.staggerLabels(true)
;
chart.yAxis
.axisLabel('Voltage (v)')
.tickFormat(function(d) {
if (d == null) {
return 'N/A';
}
return d3.format(',.2f')(d);
})
;
data = pipeGraphs(response);
d3.select('#chart1').append('svg')
.datum(data)
.call(chart);
nv.utils.windowResize(chart.update);
return chart;
})
});
String.prototype.strcmp = function(s) {
if (this < s) return -1;
if (this > s) return 1;
return 0;
}
function load(){
var parent=window.parent.document;
var div=parent.getElementById('excludedPipes');
var value=div.getAttribute('value');
if (value.length>0){
//alert("dentro");
hiddenGraphNames = value.split(",");
} else {
//alert("resetto");
hiddenGraphNames = [];
}
}
function loadJSON(callback) {
var xhr = new XMLHttpRequest();
xhr.overrideMimeType("application/json");
xhr.open('GET', 'http://materiali.c-s-m.it/phonegap/', true); // Replace 'my_data' with the path to your file
xhr.onload = function (e) {
if (xhr.readyState === 4) {
if (xhr.status === 200) {
// Required use of an anonymous callback as .open will NOT return a value but simply returns undefined in asynchronous mode
callback(xhr.responseText);
} else {
alert(xhr.statusText);
}
}
};
xhr.send(null);
}
function save(){
var parent=window.parent.document;
var div=parent.getElementById('excludedPipes');
div.setAttribute('value', hiddenGraphNames);
}
function pipeGraphs(response){
load();
var collection=[];
var actual_JSON = JSON.parse(response);
for (i in actual_JSON){
var values=[];
var element=actual_JSON[i];
var graph=element.graph;
var color=graph.color;
var key=graph.name;
var present=hiddenGraphNames.filter(function(e) { return e == key })
if (present.length>0){
setHiddenColor(true, key);
continue;
}
var j=0;
graph.values.forEach(function(value){
values.push({x: j, y: value});
j++;
});
collection.push({
area: false,
values: values,
key: key,
color: color,
strokeWidth: 4
});
}
//logValues(collection[0].values)
return collection;
}
function sinAndCos() {
var sin = [],
sin2 = [],
cos = [],
rand = [],
rand2 = []
;
for (var i = 0; i < 100; i++) {
sin.push({x: i, y: i % 10 == 5 ? null : Math.sin(i/10) }); //the nulls are to show how defined works
sin2.push({x: i, y: Math.sin(i/5) * 0.4 - 0.25});
cos.push({x: i, y: .5 * Math.cos(i/10)});
rand.push({x:i, y: Math.random() / 10});
rand2.push({x: i, y: Math.cos(i/10) + Math.random() / 10 })
}
return [
{
area: true,
values: sin,
key: "Sine Wave",
color: "#ff7f0e",
strokeWidth: 4,
classed: 'dashed'
},
{
values: cos,
key: "Cosine Wave",
color: "#2ca02c"
},
{
values: rand,
key: "Random Points",
color: "#2222ff"
},
{
values: rand2,
key: "Random Cosine",
color: "#667711",
strokeWidth: 3.5
},
{
area: true,
values: sin2,
key: "Fill opacity",
color: "#EF9CFB",
fillOpacity: .1
}
];
}
function composeAttributes(strings){
var output="?";
for (var i in strings){
var string=strings[i];
output+="=1&";
}
return output;
}
function setHiddenColor(hidden, name){
var aHref=document.getElementById(name);
if (hidden){
aHref.setAttribute("style", "color:FF0000"); //disable
//alert("rosso"+aHref);
} else {
aHref.setAttribute("style", "color:#FFFFFF"); //enable
}
}
function toggle(name){
var present=hiddenGraphNames.filter(function(e) { return e == name })
if (present.length==0){ //was enabled
hiddenGraphNames.push(name);
} else {
hiddenGraphNames = hiddenGraphNames.filter(function(e) { return e !== name })
}
save();
location.reload();
}
function loadPipeNames(response){
var menu="<ul>";
var actual_JSON = JSON.parse(response);
for (var i in actual_JSON){
var values=[];
var element=actual_JSON[i];
var graph=element.graph;
var name=graph.name;
var present=hiddenGraphNames.filter(function(e) { return e == key })
if (present.length>0){
continue;
}
menu+="<li><a id='"+name+"' href=\"#\" onclick=\"toggle('"+name+"');\">"+name+"</a></li>";
}
menu+="</ul>";
var div=document.getElementById("list");
div.innerHTML=menu;
}
function myMenu(){
loadJSON(function(response) {
loadPipeNames(response)
});
}
我在Chrome控制台上看到的错误是： index.js：41 Uncaught TypeError：无法读取属性＆＃39; querySelector＆＃39; of null（...）
答案 0 :(得分：0)
问题是由于我的iPhone上的问题导致DNS配置到外部服务器，而要连接的服务器是内置的。