Getting form input into ajax - javascript

I have a functioning PHP page with AJAX call. What Im trying to do now is to get a user input via a text input and then send thet through _GET into ajax. My code looks like this:
<body onload="test()">
<script>
function test () {
var options = {
chart : {
renderTo : 'container',
type : 'spline',
zoomType: 'x',
},
series: [{
name: '',
data: []
}]
};
year = document.form1.year.value;
$.ajax({
url : "data.php?year="+year,
dataType : 'json',
success : function (json) {
options.series[0].name = json['name'];
options.series[0].data = json['data'];
chart = new Highcharts.Chart(options);
},
});
}
</script>
<form name="form1">
<input type="text" name="year" value="2012">
</form>
</body>
Unfortunately for some reason it does not work, although when I alert "year" the value is correct and corresponds to what is inside the text input.

Sorry, never mind, Im an idiot I solved it already... I accidentaly left the value fixed to 2012 - I did that when I was testing it and forgot to delete it.

Related

Load data from local JSON file into javascript

[added:] Thank you guys for the reply. I understand that ajax has to used on a server. I wonder if there is a way to load the data from local json file into js in this example?
I have a file named employee.json. I tried load this JSON data into JavaScript. I saved both the .json and .html files on my desktop but when I click in the HTML, there is nothing shown. I tried to use alert() in the .ajax() method but it does not work. I am not sure what is wrong with my AJAX method. What do I need to do to take the id from the JSON and put it into an array in javaScript? Thank you in advance.
<!DOCTYPE html>
<html>
<body>
<p id="demo"></p>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>
<script>
var res = [];
$.ajax({
url: 'employee.json',
dataType: 'json',
method: 'get',
cache: false,
success: function(data) {
$(data.employee).each(function(index, value) {
res.push(value.id);
});
document.getElementById("demo").innerHTML = res.toString();
}
});
</script>
</body>
</html>
{
"employee": [{
"id" : 1,
"firstName" : "Lokesh"
},{
"id" : 2,
"firstName" : "bryant"
},{
"id" : 3,
"firstName" : "kobe"
}]
}
As an alternative you can load your JSON as a javascript, just wrap all your JSON data into
var employees = { /*all your json data here*/ }
and save this as employees.js
Then you can just use a regular script tag in the html:
<script src="/yourpath/employees.js"/>
And then inside your javascript "employees" will be a global object.
so you will have:
employess.employee[1].FirstName
result in "bryant" in your case;

Set a default value of an extjs 4.2 combobox using AJAX

I have a an extjs 4.2 combobox that I'm using to display some data. Now I'm trying that based on a condition the combo would display a default value. I managed to return the needed data based on that condition, however I'm failing to set the necessary value in the combobox. How am I supposed to set that specific value?
combo:
var locationStore = Ext.create('Ext.data.Store', {
model: 'model_LOCATION',
proxy: {
type: 'ajax',
url: 'Record?DB=GEO&Table=LOCATION',
reader: {
type: 'xml',
record:'record'
}
},
autoLoad:true
});
var C_LOCATION= Ext.create('Ext.form.ComboBox', {
name : 'C_LOCATION',
id : '${DB}.${Table}.C_LOCATION',
store : locationStore,
queryMode : 'local',
displayField : 'display',
valueField : 'value',
});
AJAX call:
var data;
var code = 111;
data = "CODE ='" + code + "'";
var text;
$.ajax({
type: "POST",
url: "Record?DB=GEO&Table=LOCATION",
dataType: 'xml',
data: {
"Where": data
},
success: function(xml) {
text = xml;
Ext.getCmp('${DB}.GEO.LOCATION').setValue(text);
}
});
Give the combo box a reference in the config section (reference: 'comboBox'). Then call comboBox.setValue(defaultValueGoesHere) in your function where you are getting the specific value. You may need to hunt down the comboBox reference depending where you are.
I guess you will have to parse your XML response. Similar as in your code definition for the locationStore, where you specify the record in the xml response.
Why do you make the second ajax call?
Could you not filter the locationStore based on the CODE value, instead?

Unable to validate the JS variable in PHP file

i have three files index.html , getData.php and data.json
index.html ->
<script type="text/javascript">
function load() {
var jsonData = $.ajax({
url: "getData.php",
type: "GET",
data: {variable: "loadavg"},
dataType:"json",
async: false
}).responseText;
// Create our data table out of JSON data loaded from server.
var data = new google.visualization.DataTable(jsonData);
// Instantiate and draw our chart, passing in some options.
var chart = new google.visualization.ColumnChart(document.getElementById('chart_div'));
chart.draw(data, {width: 800, height: 400});
}
</script>
<ul class="list">
<p>Load average <input id="loadAvg" type="button" value="Enter" onclick="load();" /> </p>
</ul>
getData.php ->
<?php
// It reads a json formatted text file and outputs it.
if(isset($_GET["variable"]) == "loadavg"){
$string = file_get_contents("data.json");
echo $string;
// if this works you should see in console 'graph on cosole'
}
?>
data.json ->
{
"cols": [
{"id":"","label":"HostName","type":"string"},
{"id":"","label":"CPU","type":"number"},
{"id":"","label":"Free Avg memory","type":"number"}
],
"rows": [
{"c":[{"v":"lp10b2vapp01,w10"},{"v":21}]},
{"c":[{"v":"lp10b2vapp01,w10"},{"v":15}]},
{"c":[{"v":"lp10b2vapp01,w10"},{"v":73}]},
{"c":[{"v":"lp10b2vapp01,w10"},{"v":60}]},
{"c":[{"v":"lp10b2vapp01,w10"},{"v":48}]},
{"c":[{"v":"lp10b2vapp01,w10"},{"v":40}]},
{"c":[{"v":"lp10b2vapp01,w10"},{"v":36}]}
]
}
when i click on button i was unable to see the output (Graph) ,Kindly look help me
Thanks in advance
Don't use async: false. It's terribly bad practice as it locks the UI thread making the browser look to the user like it has crashed until the request completes. Instead use the async callbacks which $.ajax provides you to update the UI of the page once the request has finished. Try this:
function load() {
$.ajax({
url: "getData.php",
type: "GET",
data: {
variable: "loadavg"
},
dataType: "json",
success: function(jsonData) {
var data = new google.visualization.DataTable(jsonData);
var chart = new google.visualization.ColumnChart($('#chart_div')[0]);
chart.draw(data, {
width: 800,
height: 400
});
}
});
}
Also note that you need to get the value of the parameter in the PHP code as well as checking it exists:
if (isset($_GET["variable"]) && $_GET["variable"] == "loadavg")
{
// code here...
}

JSON output for highcharts

So I have finally managed to get a chart generated, but the problem is that for some reason the data from JSON is not displayed - ie I get a blank chart.
In the chart options I simply have:
series : [{
name: '2000',
data: [],
}]
The AJAX call looks like this:
$.ajax({
url : 'data.php',
datatype : 'json',
success : function (json) {
options.series[0].data = json['data'];
chart = new Highcharts.Chart(options);
},
});
}
And the data.php output looks like this:
{"data":[-1.4,-1.4,-1.3,-1.3,-1.3,-1.3,-1.3,-1.2,-1.3,-1.2,-1.2,-1.2]}
Im becoming desperate as I tried everything and still get just a blank chart with no data.
If you're using Internet Explorer, those extra commas will cause you problems.
series : [{
name: '2000',
data: []
}]
$.ajax({
url : 'data.php',
datatype : 'json',
success : function (json) {
options.series[0].data = json['data'];
chart = new Highcharts.Chart(options);
}
});
}
Its likely that your json values are coming back as strings but highcharts is expecting numbers.
In your data.php try typing your variables before json_encoding them:
array_push($myArray, (float)$value);
return json_encode(myArray);
If your highcharts data looks like:
["-1.4","-1.4","-1.3","-1.3","-1.3","-1.3","-1.3","-1.2","-1.3","-1.2","-1.2","-1.2"]
It wont render, it needs to be straight number:
[-1.4,-1.4,-1.3,-1.3,-1.3,-1.3,-1.3,-1.2,-1.3,-1.2,-1.2,-1.2]

Loading Highcharts series from XML using jQuery

I am trying to populate a highchart series from an xml source using jQuery. The XML file is an export from RRDTool and has the following format:
<data>
<row><t>1347559200</t><v>2.1600000000e+01</v></row>
<row><t>1347562800</t><v>2.1504694630e+01</v></row>
<row><t>1347566400</t><v>2.1278633024e+01</v></row>
.
.
.
</data>
My approach was to load the data using jQuery and push the series to the chart:
$.ajax({
type: "GET",
url: "data/data.xml",
dataType: "xml",
success: function(xml) {
var series = { data: []
};
$(xml).find("row").each(function()
{
var t = parseInt($(this).find("t").text())*1000
var v = parseFloat($(this).find("v").text())
series.data.push([t,v]);
});
options.series.push(series);
}
});
I end up getting the following error:
Unexpected value NaN parsing y attribute
I created a JSFiddle to demonstrate the code: http://jsfiddle.net/GN56f/
Aside from the cross-domain issue, the error is due to there being an existing empty series in the plot options. The initial series in the options should be set to:
series: []
instead of:
series: [{
name: 'Temperature',
data: []
}]
The subsequent call to options.series.push(series); merely adds a new series leaving the empty one unchanged.
Problems:
you forgot var before declare options and chart
forgot ; after end options
Hava you tried to log options before pass to Highcharts ? You're passing the following series.
That's the expected result ? I think no.
series: [{
name: 'Temperature',
data: []
}, {
data: [// data from xml]
}]
You're creating the chart before complete the request, so options.series.data.push will not work, you have to use setData to update dynamically, but there's a problem, you don't know how long the request you take, so I suggest you to create the chart inside the success.
Try the following.
success: function(xml) {
$('row', xml).each(function() {
options.series.data.push([t,v]);
});
//#todo: declare chart as global before the ajax function
chart = new Highcharts.Chart(options);
}

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