Question

我正在尝试修改它的arduino代码，温度计到PHP，并且有来自file_get_contents的文件声明值的问题

这是原始代码：

这是我的修改代码：

我只在以下部分更改：--- Gauge Code Ends -

<!DOCTYPE html>

<html>
    <head>
        <title>Arduino Two Temperaturesa</title>
        <script>

        var data_val = 0

        var data_val2 = 0;
<!-- Gauge Code Starts -->
var Gauge=function(b){function l(a,b){for(var c in b)"object"==typeof b[c]&&"[object Array]"!==Object.prototype.toString.call(b[c])&&"renderTo"!=c?("object"!=typeof a[c]&&(a[c]={}),l(a[c],b[c])):a[c]=b[c]}function q(){z.width=b.width;z.height=b.height;A=z.cloneNode(!0);B=A.getContext("2d");C=z.width;D=z.height;t=C/2;u=D/2;f=t<u?t:u;A.i8d=!1;B.translate(t,u);B.save();a.translate(t,u);a.save()}function v(a){var b=new Date;G=setInterval(function(){var c=(new Date-b)/a.duration;1<c&&(c=1);var f=("function"==
typeof a.delta?a.delta:M[a.delta])(c);a.step(f);1==c&&clearInterval(G)},a.delay||10)}function k(){G&&clearInterval(G);var a=I-n,h=n,c=b.animation;v({delay:c.delay,duration:c.duration,delta:c.fn,step:function(b){n=parseFloat(h)+a*b;E.draw()}})}function e(a){return a*Math.PI/180}function g(b,h,c){c=a.createLinearGradient(0,0,0,c);c.addColorStop(0,b);c.addColorStop(1,h);return c}function p(){var m=93*(f/100),h=f-m,c=91*(f/100),e=88*(f/100),d=85*(f/100);a.save();b.glow&&(a.shadowBlur=h,a.shadowColor=
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maxValue:100,minValue:0,majorTicks:[],minorTicks:10,strokeTicks:!0,units:!1,valueFormat:{"int":3,dec:2},majorTicksFormat:{"int":1,dec:0},glow:!0,animation:{delay:10,duration:250,fn:"cycle"},colors:{plate:"#fff",majorTicks:"#444",minorTicks:"#666",title:"#888",units:"#888",numbers:"#444",needle:{start:"rgba(240, 128, 128, 1)",end:"rgba(255, 160, 122, .9)"}},highlights:[{from:20,to:60,color:"#eee"},{from:60,to:80,color:"#ccc"},{from:80,to:100,color:"#999"}]};var y=0,E=this,n=0,I=0,H=!1;this.setValue=
function(a){n=b.animation?y:a;var d=(b.maxValue-b.minValue)/100;I=a>b.maxValue?b.maxValue+d:a<b.minValue?b.minValue-d:a;y=a;b.animation?k():this.draw();return this};this.setRawValue=function(a){n=y=a;this.draw();return this};this.clear=function(){y=n=I=this.config.minValue;this.draw();return this};this.getValue=function(){return y};this.onready=function(){};l(this.config,b);this.config.minValue=parseFloat(this.config.minValue);this.config.maxValue=parseFloat(this.config.maxValue);b=this.config;n=
y=b.minValue;if(!b.renderTo)throw Error("Canvas element was not specified when creating the Gauge object!");var z=b.renderTo.tagName?b.renderTo:document.getElementById(b.renderTo),a=z.getContext("2d"),A,C,D,t,u,f,B;q();this.updateConfig=function(a){l(this.config,a);q();this.draw();return this};var M={linear:function(a){return a},quad:function(a){return Math.pow(a,2)},quint:function(a){return Math.pow(a,5)},cycle:function(a){return 1-Math.sin(Math.acos(a))},bounce:function(a){a:{a=1-a;for(var b=0,
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a.fillStyle=b.colors.units,a.textAlign="center",a.fillText(b.units,0,f/3.25),a.restore());A.i8d=!0;a=g.ctx;delete g.ctx}a.clearRect(-t,-u,C,D);a.save();a.drawImage(A,-t,-u,C,D);if(Gauge.initialized)L(),K(),H||(E.onready&&E.onready(),H=!0);else var e=setInterval(function(){Gauge.initialized&&(clearInterval(e),L(),K(),H||(E.onready&&E.onready(),H=!0))},10);return this}};Gauge.initialized=!1;
(function(){var b=document,l=b.getElementsByTagName("head")[0],q=-1!=navigator.userAgent.toLocaleLowerCase().indexOf("msie"),v="@font-face {font-family: 'Led';src: url('fonts/digital-7-mono."+(q?"eot":"ttf")+"');}",k=b.createElement("style");k.type="text/css";if(q)l.appendChild(k),l=k.styleSheet,l.cssText=v;else{try{k.appendChild(b.createTextNode(v))}catch(e){k.cssText=v}l.appendChild(k);l=k.styleSheet?k.styleSheet:k.sheet||b.styleSheets[b.styleSheets.length-1]}var g=setInterval(function(){if(b.body){clearInterval(g);
var e=b.createElement("div");e.style.fontFamily="Led";e.style.position="absolute";e.style.height=e.style.width=0;e.style.overflow="hidden";e.innerHTML=".";b.body.appendChild(e);setTimeout(function(){Gauge.initialized=!0;e.parentNode.removeChild(e)},250)}},1)})();Gauge.Collection=[];
Gauge.Collection.get=function(b){if("string"==typeof b)for(var l=0,q=this.length;l<q;l++){if((this[l].config.renderTo.tagName?this[l].config.renderTo:document.getElementById(this[l].config.renderTo)).getAttribute("id")==b)return this[l]}else return"number"==typeof b?this[b]:null};function domReady(b){window.addEventListener?window.addEventListener("DOMContentLoaded",b,!1):window.attachEvent("onload",b)}
domReady(function(){function b(b){for(var e=b[0],d=1,g=b.length;d<g;d++)e+=b[d].substr(0,1).toUpperCase()+b[d].substr(1,b[d].length-1);return e}for(var l=document.getElementsByTagName("canvas"),q=0,v=l.length;q<v;q++)if("canv-gauge"==l[q].getAttribute("data-type")){var k=l[q],e={},g,p=parseInt(k.getAttribute("width"),10),w=parseInt(k.getAttribute("height"),10);e.renderTo=k;p&&(e.width=p);w&&(e.height=w);p=0;for(w=k.attributes.length;p<w;p++)if(g=k.attributes.item(p).nodeName,"data-type"!=g&&"data-"==
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e[d]=g}}e=new Gauge(e);k.getAttribute("data-value")&&e.setRawValue(parseFloat(k.getAttribute("data-value")));k.getAttribute("data-onready")&&(e.onready=function(){eval(this.config.renderTo.getAttribute("data-onready"))});e.draw()}});window.Gauge=Gauge;
<!-- Gauge Code Ends -->


<?php
$ht4 = file_get_contents("/var/www/html/ht41.txt");
?>
data_val = $ht4
data_val2 = 30 


    </script>
        <h1>Arduino Two Temperatures</h1>
        <canvas id="an_gauge_1" data-title="Inside" data-units="Temp. &deg;C" width="500" height="500" data-major-ticks="-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150" data-type="canv-gauge" data-min-value="-40" data-max-value="150" data-highlights="-40 0 #4D89F2, 0 10 #25B8D9, 10 30 #0BB950, 30 40 #cc5, 40 150 #f33" data-onready="setInterval( function() { Gauge.Collection.get('an_gauge_1').setValue(data_val);}, 200);"></canvas>
        <canvas id="an_gauge_2" data-title="Outside" data-units="Temp. &deg;C" width="500" height="500" data-major-ticks="-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150" data-type="canv-gauge" data-min-value="-40" data-max-value="150" data-highlights="-40 0 #4D89F2, 0 10 #25B8D9, 10 30 #0BB950, 30 40 #cc5, 40 150 #f33" data-onready="setInterval( function() { Gauge.Collection.get('an_gauge_2').setValue(data_val2);}, 200);"></canvas>
    </body>
</html>

我对declare data_val和data_val2

有疑问

如果我用脚本固定值写：

.
.
<!-- Gauge Code Ends -->

data_val = 20.5
data_val2 = 30.8 


    </script>
.
.

工作温度计OK，

但我想从文件中读取data_val的温度值，但不起作用。我试着用这个：

<!-- Gauge Code Ends -->


<?php
$ht4 = file_get_contents("/var/www/html/ht41.txt");
?>
data_val = $ht4
data_val2 = 30.8 


    </script>

Fajl ht41.txt只有数字：“23.548”

我做错了什么？

感谢您的帮助！

Answer 1

你不能像这样混合javascript和php：PHP在服务器上运行，当javascript被执行时，将没有php，你在php中的任务导致什么都没有。

而不是：

<?php
// This does not do anything unless you use $ht4 after this in PHP
$ht4 = file_get_contents("/var/www/html/ht41.txt");
?>
// in your javascript, there is no $ht4 variable.
data_val = $ht4
data_val2 = 30.8

您需要以下内容：

data_val = <?php echo trim(file_get_contents("/var/www/html/ht41.txt")); ?>;
data_val2 = 30.8;

请注意，将值从php传递到javascript的最安全方法是使用json_encode()，但正如您所提到的，您的文件仅包含23.54我在此处没有这样做。使用json_encode()将确保您传递给javascript的变量将被正确转义/编码和引用。

使用文件获取内容从文件声明值

1 个答案: