Pass An Array From Php To Javascript
I'm trying to pass an array from php (on a separate file) side to JavaScript and update HTML table. The array on the php side is a result of MySQL query. Here is what I've done so
Solution 1:
Don't forget to set the header :
header('Content-Type: application/json');
When you do "document.getElementById(i)" you try to access on an element witch having a bad ID (integer)... Here is the rule :
ID and NAME tokens must begin with a letter ([A-Za-z]) and may be followed by any number of letters, digits ([0-9]), hyphens ("-"), underscores ("_"), colons (":"), and periods (".").
Solution 2:
Here is the complete page
<script type="text/javascript" >
setInterval(updateSensorsTable, 2000);
setInterval(updatePower, 1000);
functionshowValue(value) {
//show value in htmldocument.getElementById("brightnesValue").innerHTML = value;
//Set brightness value to DB id=10callPage('/setValueToDB.php?value=' + value + '& id=10' + '', document.getElementById(''));
}
functionTurnLedOn() {
//TODO: need to set the led state and update the sql serverdocument.getElementById("ledStatus").src = "/LedOn.png";
callPage('/setValueToDB.php?value=1&id=9' + '', document.getElementById(''));
}
functionTurnLedOff() {
//TODO: need to set the led state and update the sql serverdocument.getElementById("ledStatus").src = "/LedOff.png";
callPage('/setValueToDB.php?value=0&id=9' + '', document.getElementById(''));
}
functionAjaxCaller() {
var xmlhttp = false;
try {
xmlhttp = newActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try {
xmlhttp = newActiveXObject("Microsoft.XMLHTTP");
} catch (E) {
xmlhttp = false;
}
}
if (!xmlhttp && typeofXMLHttpRequest != 'undefined') {
xmlhttp = newXMLHttpRequest();
}
return xmlhttp;
}
functioncallPage(url, div) {
var ajax = AjaxCaller();
ajax.open("GET", url, true);
ajax.onreadystatechange = function () {
if (ajax.readyState == 4) {
if (ajax.status == 200) {
div.innerHTML = ajax.responseText;
}
}
}
ajax.send(null);
}
functionupdateSensorsTable() {
for (i = 0; i < 8; i++) {
callPage('/getVarFromDB.php?offset=' + i , document.getElementById(i));
}
/*
$.getJSON("/getTableFromDB.php", function (json) {
for (i = 0; i < 8;i++ )
document.getElementById(i).innerHTML = json[i];
});
*/
}
functionupdatePower() {
callPage('/getVarFromDB.php?offset=' + 10, document.getElementById('powerValue'));
}
</script><!DOCTYPE html><htmllang="en"><head><metacharset="utf-8" /><metaname="viewport"content="width=device-width,height=device-height,initial-scale=1.0"/><title>SmartLight</title></head><bodybgcolor="#E6E6FA"><br></br><tableclass="sensorsTable"align="center"><thead><tr ><th>Sensor</th><th>Value</th></tr></thead><tbody><tr><tdalign="left">GPS</td><tdalign="center"id="0">0</td></tr><tr><tdalign="left">Temperature</td><tdalign="center"id="1">0</td></tr><tr><tdalign="left">Pressure</td><tdalign="center"id="2">0</td></tr><tr><tdalign="left">Light</td><tdalign="center"id="3">0</td></tr><tr><tdalign="left">Altitude</td><tdalign="center"id="4">0</td></tr><tr><tdalign="left">Accelerometer</td><tdalign="center"id="5">0</td></tr><tr><tdalign="left">Humidity</td><tdalign="center"id="6">0</td></tr><tr><tdalign="left">Camera</td><tdalign="center"id="7">0</td></tr></tbody></table><br></br><tableclass="ledTable"align="center"><tr><tdalign="center"><inputtype="image"src="/TurnOn.png"id="turnOn"width="60"height="60"onclick='TurnLedOn()'></td><tdalign="center"><inputtype="image"src="/TurnOff.png"id="turnOff"width="60"height="60"onclick='TurnLedOff()'></td><tdalign="center"><imgsrc="/LedOn.png"style="width:60px;height:60px"id="ledStatus"></td></tr><tr><tdalign="center"id="ledOnButton">LED On</td><tdalign="center"id="ledOffButton">LED Off</td><tdalign="center">LED Status</td></tr></table><divalign="center">
Brightness:
<inputtype="range"id="brightnesBar"min="0"max="100"value="0"step="1"onchange="showValue(this.value)" /><spanid="brightnesValue">0</span><tablealign="center"class="power"><tr><tdalign="center"id="powerValue">0</td><tdalign="left">mW</td></tr></table><divalign="center" >LED Power Meter</div></div>
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