Develop Reference

problems with storing getjson request in variable

I'm having troubles with getting a variable from a getJSON() request. I have the following three functions:
function getPcLatitude() { // onchange
var funcid = "get_postcode_latitude";
var postcode = parseInt($('#input-field-postcode').val());
var jqxhr = $.getJSON('functions/getdata.php', {
"funcid":funcid,
"postcode":postcode}).done(function(dataLatitude) {
if (dataLatitude == null) {
//..
} else {
var myLatitude = 0;
for (var i=0;i<dataLatitude.length;i++){
myLatitude = dataLatitude[i].pc_latitude;
}
return parseFloat(myLatitude);
//alert(myLatitude);
}
});
}
function getPcLongitude() { // onchange
var funcid = "get_postcode_longitude";
var postcode = parseInt($('#input-field-postcode').val());
var jqxhr = $.getJSON('functions/getdata.php', {
"funcid":funcid,
"postcode":postcode}).done(function(dataLongitude) {
if (dataLongitude == null) {
//..
} else {
var myLongitude = 0;
for (var i=0;i<dataLongitude.length;i++){
myLongitude = dataLongitude[i].pc_longitude;
}
return parseFloat(myLongitude);
//alert(myLongitude);
}
});
}
function getTop5Postcode() { // onchange
setTimeout(function() {
var funcid = "get_top_5_postcode";
var er = rangeM3Slider.noUiSlider.get();
var zv = $("#selectzv").val();
if (zv < 1) {
var zv = $("#selectzvfc").val();
}
var zp = $("#selectzp").val();
if (zp < 1) {
var zp = $("#selectzpfc").val();
}
var latitude = getPcLatitude();
var longitude = getPcLongitude();
var chosendistance = parseInt($('#input-field-afstand').val());
var jqxhr = $.getJSON('functions/getdata.php', {
"funcid":funcid,
"er":er,
"zp":zp,
"zv":zv,
"latitude":latitude,
"longitude":longitude,
"chosendistance":chosendistance}).done(function(dataPrices) {
if (dataPrices == null) {
$('#myModalAlert').modal('show');
} else {
//$('#myModalData').modal('show');
var table = '';
var iconClassZkn = '';
var iconClassIp = '';
for (var i=0;i<dataPrices.length;i++){
if (dataPrices[i].zkn_score == 0) {
iconClassZkn = 'no-score';
} else {
iconClassZkn = 'zkn-score';
}
if (dataPrices[i].ip_score == 0) {
iconClassIp = 'no-score';
} else {
iconClassIp = 'ip-score';
}
table += '<tr>'
+ '<td width="75" class="zkh-image" align="center">'+ dataPrices[i].zvln_icon +'</td>'
+ '<td width="250" align="left"><b>'+ dataPrices[i].zvln +'</b><br><i>Locatie: ' + dataPrices[i].zvln_city + '</i></td>'
+ '<td class=text-center> € '+ dataPrices[i].tarif +'</td>'
+ '<td class=text-center> € '+ dataPrices[i].risico +'</td>'
+ '<td class=text-center><a target="_blank" href="' + dataPrices[i].zkn_url + '"><span class="' + iconClassZkn + '"><font size="2"><b>' + dataPrices[i].zkn_score + '</b></font></span></a></td>'
+ '<td class=text-center><a target="_blank" href="' + dataPrices[i].ip_url + '"><span class="' + iconClassIp + '"><font size="2"><b>' + dataPrices[i].ip_score + '</b></font></span></a></td>'
+ '</tr>';
}
$('#top5').html(table);
//$('#myModalData').modal('hide');
}
})
.fail(function() { $('#myModalAlert').modal('show');}); //When getJSON request fails
}, 0);
}
Form some reason the
var latitude = getPcLatitude();
var longitude = getPcLongitude();
parts don't work / don't get a value form the functions. When I change the return in both functions into an alert() it does give me the expected values, so those two functions work.
When I set the two variables directly, like so:
var latitude = 5215;
var longitude = 538;
then the getTop5Postcode() function does work and fills the table.
Any help on this?
Regards, Bart

Do not forget that JavaScript is asynchronous, so by the time you reach the return statement, the request is probably not done yet. You can use a promise, something like:
$.getJSON(....).then(function(value){//do what you want to do here})

Both your functions (getPcLatitude and getPcLongitude) are returning nothing because the return statement is inside a callback from an asynchronous request, and that's why an alert show the correct value.
I would suggest you to change both methods signature adding a callback parameter.
function getPcLatitude(callback) {
...
}
function getPcLongitude(callback) {
...
}
And instead of returning you should pass the value to the callback:
callback(parseFloat(myLatitude));
callback(parseFloat(myLongitude));
And your last function would be somehting like that:
function getTop5Postcode() { // onchange
setTimeout(function() {
var latitude;
var longitude;
getPcLatitude(function(lat) {
latitude = lat;
getTop5(); // Here you call the next function because you can't be sure what response will come first.
});
getPcLongitude(function(longi) {
longitude = longi;
getTop5();
});
function getTop5() {
if (!latitude || !longitude) {
return; // This function won't continue if some of the values are undefined, null, false, empty or 0. You may want to change that.
}
var funcid = "get_top_5_postcode";
var er = rangeM3Slider.noUiSlider.get();
var zv = $("#selectzv").val();
if (zv < 1) {
var zv = $("#selectzvfc").val();
}
var zp = $("#selectzp").val();
if (zp < 1) {
var zp = $("#selectzpfc").val();
}
var chosendistance = parseInt($('#input-field-afstand').val());
var jqxhr = $.getJSON('functions/getdata.php', {
"funcid":funcid,
"er":er,
"zp":zp,
"zv":zv,
"latitude":latitude,
"longitude":longitude,
"chosendistance":chosendistance}).done(function(dataPrices) {
if (dataPrices == null) {
$('#myModalAlert').modal('show');
} else {
//$('#myModalData').modal('show');
var table = '';
var iconClassZkn = '';
var iconClassIp = '';
for (var i=0;i<dataPrices.length;i++){
if (dataPrices[i].zkn_score == 0) {
iconClassZkn = 'no-score';
} else {
iconClassZkn = 'zkn-score';
}
if (dataPrices[i].ip_score == 0) {
iconClassIp = 'no-score';
} else {
iconClassIp = 'ip-score';
}
table += '<tr>'
+ '<td width="75" class="zkh-image" align="center">'+ dataPrices[i].zvln_icon +'</td>'
+ '<td width="250" align="left"><b>'+ dataPrices[i].zvln +'</b><br><i>Locatie: ' + dataPrices[i].zvln_city + '</i></td>'
+ '<td class=text-center> € '+ dataPrices[i].tarif +'</td>'
+ '<td class=text-center> € '+ dataPrices[i].risico +'</td>'
+ '<td class=text-center><a target="_blank" href="' + dataPrices[i].zkn_url + '"><span class="' + iconClassZkn + '"><font size="2"><b>' + dataPrices[i].zkn_score + '</b></font></span></a></td>'
+ '<td class=text-center><a target="_blank" href="' + dataPrices[i].ip_url + '"><span class="' + iconClassIp + '"><font size="2"><b>' + dataPrices[i].ip_score + '</b></font></span></a></td>'
+ '</tr>';
}
$('#top5').html(table);
//$('#myModalData').modal('hide');
}
})
.fail(function() { $('#myModalAlert').modal('show');}); //When getJSON request fails
}
}, 0);
}
Of course, this is far away from the perfect solution for your problem but it should work!
And I did not test this code.

I solved this by doing some extra stuff in mysql queries. Now I only have to use the main function.
Things work now! Thanks for all the help!

document.write() Is Removing All Page Content When Calling After Page Load

I have a web page where I am reading Google Blogger blog category from his feed using JSON. I have two functions. First on is getting all the Blog Categories List and second one is taking Blog Categories from that and then hitting again Blog to get latest posts from that This is the text test to see that web page data is here or not.
<div id="blogCategoriesList">
<script type="text/javascript">
var blogurl = "https://googleblog.blogspot.com/";
function blogCatList(json) {
document.write('<select onchange="showThisCatPosts(this.value)">');
document.write('<option>CHOOSE A CATEGORY</option>');
for (var i = 0; i < json.feed.category.length; i++)
{
var item = "<option value='" + json.feed.category[i].term + "'>" + json.feed.category[i].term + "</option>";
document.write(item);
}
document.write('</select>');
}
document.write('<script type=\"text/javascript\" src=\"' + blogurl + '/feeds/posts/default?redirect=false&orderby=published&alt=json-in-script&callback=blogCatList&max-results=500\"><\/script>');
document.write('<br/><br/><a href=\"' + blogurl + '\" target=\"_blank\" class=\"footerLINK\">Read The Blog Online Now<\/a>');
</script>
</div>
<div id="blogCategoriesPost">
<script style='text/javascript'>
var blogurl = "https://googleblog.blogspot.com/";
var numposts = 10; // Out Of 500
var displaymore = true;
var showcommentnum = true;
var showpostdate = true;
var showpostsummary = true;
var numchars = 100;
function blogCategoriesPost(json) {
if(json.feed.entry.length < numposts ){
numposts = json.feed.entry.length;
}
for (var i = 0; i < numposts; i++) {
var entry = json.feed.entry[i];
var posttitle = entry.title.$t;
var posturl;
if (i == json.feed.entry.length) break;
for (var k = 0; k < entry.link.length; k++) {
if (entry.link[k].rel == 'replies' && entry.link[k].type == 'text/html') {
var commenttext = entry.link[k].title;
var commenturl = entry.link[k].href;
}
if (entry.link[k].rel == 'alternate') {
posturl = entry.link[k].href;
break;
}
}
var postdate = entry.published.$t;
var cdyear = postdate.substring(0, 4);
var cdmonth = postdate.substring(5, 7);
var cdday = postdate.substring(8, 10);
var monthnames = new Array();
monthnames[1] = "Jan";
monthnames[2] = "Feb";
monthnames[3] = "Mar";
monthnames[4] = "Apr";
monthnames[5] = "May";
monthnames[6] = "Jun";
monthnames[7] = "Jul";
monthnames[8] = "Aug";
monthnames[9] = "Sep";
monthnames[10] = "Oct";
monthnames[11] = "Nov";
monthnames[12] = "Dec";
document.write('<div id="mainDIV">');
document.write('<h2 class="post_heading">' + posttitle + '</h2>');
if ("content" in entry) {
var postcontent = entry.content.$t;
} else
if ("summary" in entry) {
var postcontent = entry.summary.$t;
} else var postcontent = "";
var re = /<\S[^>]*>/g;
postcontent = postcontent.replace(re, ""); // Will Show Only Text Instead Of HTML
if (showpostsummary == true) {
if (postcontent.length < numchars) {
document.write('<span class="post_summary">');
document.write(postcontent);
document.write('</span>');
} else {
//document.getElementById("catPosts").innerHTML += '<span class="post_summary">';
document.write('<span class="post_summary">');
postcontent = postcontent.substring(0, numchars);
var quoteEnd = postcontent.lastIndexOf(" ");
postcontent = postcontent.substring(0, quoteEnd);
document.write(postcontent + '...');
document.write('</span>');
}
}
var towrite = '';
document.write('<strong class="post_footer">');
if (showpostdate == true) {
towrite = 'Published On: ' + towrite + monthnames[parseInt(cdmonth, 10)] + '-' + cdday + '-' + cdyear;
}
if (showcommentnum == true) {
if (commenttext == '1 Comments') commenttext = '1 Comment';
if (commenttext == '0 Comments') commenttext = 'No Comments';
commenttext = '<br/>' + commenttext + '';
towrite = towrite + commenttext;
}
if (displaymore == true) {
towrite = towrite + '<br/>Read Full Article -->';
}
document.write(towrite);
document.write('</strong></div>');
}
}
function showThisCatPosts(BLOGCAT){
document.write('<script type=\"text/javascript\" src=\"' + blogurl + '/feeds/posts/default/-/' + BLOGCAT + '?redirect=false&orderby=published&alt=json-in-script&callback=blogCategoriesPost&max-results=500\"><\/script>');
document.write('<a href=\"' + blogurl + '\" target=\"_blank\" class=\"footerLINK\">Read The Blog Online Now<\/a>');
}
</script>
You can see a working DEMO at JSBIN. My problem is that when page load, its works perfectly showing all page data and the blog categories lists too but when I select any category then my all page data remove and only that label posts are visible. Why this is happening...??? I want to just change the posts as per label not to remove all page data...

That's the normal behaviour of document.write(). You might need to use:
document.getElementById("element_id").innerHTML = 'Stuff to Write.';

Finally I got it solved. The reason is that document.write() is bad as it write the text on page load. You can use it if you want to write some text on page load not later.
If you want to write later then have to use document.getElementById("element_id").innerHTML to write your text but if you want to write <script> tags then document.getElementById("element_id").innerHTML is not good as it will write but dont hit the SRC so use document.createElement("script") to write scripts after page load that will be runable too.
See the working DEMO of my code at JSBIN... :)
Special Thanks To: #Praveen Kumar :-)

Kendo UI Grid Export CSV using Javascript

please help me my probs,am using kendo ui grid in my webapp & trying to grid data export into EXcel and CSV format. Code Works good in Chrome and files are downloading, but in Fire Fox its open a new window show the grid details in url and says bad request,
//code is
$("#exportcsv").click(function (e) {
debugger
var dataSource = $("#grid").data("kendoGrid").dataSource;
var filteredDataSource = new kendo.data.DataSource({
data: dataSource.data(),
filter: dataSource.filter()
});
filteredDataSource.read();
var data = filteredDataSource.view();
//start with the desired column headers here
var result = "\"ID\",\"EID\",\"Name\",\"Company Name\",\"Salary\",\"DID\",\"Date Of Join\"";
//each column will need to be called using the field name in the data source
for (var i = 0; i < data.length; i++) {
result += "\n";
result += "\"" + data[i].id + "\",";
result += "\"" + data[i].EID + "\",";
result += "\"" + data[i].EName + "\",";
result += "\"" + data[i].CName + "\",";
result += "\"" + data[i].Salary + "\",";
result += "\"" + data[i].DID + "\",";
result += "\"" + data[i].DOJ + "\",";
}
if (window.navigator.msSaveBlob) {
//Internet Explorer
window.navigator.msSaveBlob(new Blob([result]), 'ExportedKendoGrid.csv');
}
else if (window.webkitURL != null) {
//Google Chrome and Mozilla Firefox
var a = document.createElement('a');
result = encodeURIComponent(result);
a.href = 'data:application/csv;charset=UTF-8,' + result;
a.download = 'ExportedKendoGrid.csv';
a.click();
}
else {
//Everything Else
window.open(result);
}
e.preventDefault();
});
//below code is not working in firefox browser else if
(window.webkitURL != null) {
//Google Chrome and Mozilla Firefox
var a = document.createElement('a');
result = encodeURIComponent(result);
a.href = 'data:application/csv;charset=UTF-8,' + result;
a.download = 'ExportedKendoGrid.csv';
a.click();
}

"Page Unresponsive" Error in Chrome when trying to GET files > 500kb

I am trying to get Log files in my application, and am using Ajax to do so.
The problem is that while using Chrome I constantly get 'Page Unresponsive' Errors when I try to load the files.
My application is working fine in Firefox, so I'm guessing this is a webkit issue.
I removed xhr because I heard chrome has a problem with it.
This is my code -
$.ajax(
{
type: 'GET',
url: "Logs/GetLogFile?option=" + logFile,
data: {},
success: function (data) {
var fileData = data;
cleanUp();
currentlyViewedFile = logFile;
var fileLines = fileData.split('\n');
var htmlString = '';
var lineCount = 0;
for (var i = 0; i < fileLines.length; i++) {
lineCount = lineCount + 1;
if (i == (highlightLine - 1)) {
htmlString += '<span id="highLoc" style="display:block"><font size="4" color="red">' + lineCount + '. ' + fileLines[i] + '</font></span>';
}
else {
htmlString += '<span class="spanClass">' + lineCount + '. ' + fileLines[i];
}
var combinedLine = fileLines[i];
var isNewLogLine = false;
var newLogLineCount = 0;
while (((i + newLogLineCount + 1) < fileLines.length) && (isNewLogLine == false)) {
var NextlogLine = fileLines[i + newLogLineCount + 1].split(' ');
isNewLogLine = isLogLine(NextlogLine[0]);
if (isNewLogLine == true) {
break;
}
htmlString += fileLines[i + newLogLineCount + 1];
combinedLine += fileLines[i + newLogLineCount + 1];
newLogLineCount = newLogLineCount + 1
}
i = i + newLogLineCount;
var logLine = combinedLine.split(' ');
var logMsgStartIndex = combinedLine.indexOf(logLine[5]);
var logMsg = combinedLine.substring(logMsgStartIndex);
var obj = {
lineNos: lineCount,
date: logLine[0],
time: logLine[1],
severity: logLine[2],
logClassName: logLine[4],
logMessage: logMsg
};
fileArray.push(obj);
if ((i % 1000) == 0) {
$("#textPlace").append(htmlString);
htmlString = '';
window.scrollTo(0, 2);
}
}
fileLines = null;
$("#fetchProgress").hide();
$("#textPlace").append(htmlString);
//highlight error location
var scrollX = $("#highLoc");
if (scrollX) {
if (!scrollX[0]) return;
var scrollDistance = '{ scrollTop: ' + scrollX[0].offsetTop + '}';
var distanceInJson = eval("(" + scrollDistance + ")");
$("#mainContentBox").animate(distanceInJson, 1);
}
},
///success function end
fail: function (jqXHR, textStatus) {
alert("Request failed: " + textStatus);
}
});
If anyone has any ideas on how to deal with this issue, please let me know.

How can I open with blank page on this rss javascript nor html?

I have a website which includes this RSS JavaScript. When I click feed, it opens same page, but I don't want to do that. How can I open with blank page? I have my current HTML and JavaScript below.
HTML CODE
<tr>
<td style="background-color: #808285" class="style23" >
<script type="text/javascript">
$(document).ready(function () {
$('#ticker1').rssfeed('http://www.demircelik.com.tr/map.asp').ajaxStop(function () {
$('#ticker1 div.rssBody').vTicker({ showItems: 3 });
});
});
</script>
<div id="ticker1" >
<br />
</div>
</td>
</tr>
JAVASCRIPT CODE
(function ($) {
var current = null;
$.fn.rssfeed = function (url, options) {
// Set pluign defaults
var defaults = {
limit: 10,
header: true,
titletag: 'h4',
date: true,
content: true,
snippet: true,
showerror: true,
errormsg: '',
key: null
};
var options = $.extend(defaults, options);
// Functions
return this.each(function (i, e) {
var $e = $(e);
// Add feed class to user div
if (!$e.hasClass('rssFeed')) $e.addClass('rssFeed');
// Check for valid url
if (url == null) return false;
// Create Google Feed API address
var api = "http://ajax.googleapis.com/ajax/services/feed/load?v=1.0&callback=?&q=" + url;
if (options.limit != null) api += "&num=" + options.limit;
if (options.key != null) api += "&key=" + options.key;
// Send request
$.getJSON(api, function (data) {
// Check for error
if (data.responseStatus == 200) {
// Process the feeds
_callback(e, data.responseData.feed, options);
}
else {
// Handle error if required
if (options.showerror) if (options.errormsg != '') {
var msg = options.errormsg;
}
else {
var msg = data.responseDetails;
};
$(e).html('<div class="rssError"><p>' + msg + '</p></div>');
};
});
});
};
// Callback function to create HTML result
var _callback = function (e, feeds, options) {
if (!feeds) {
return false;
}
var html = '';
var row = 'odd';
// Add header if required
if (options.header) html += '<div class="rssHeader">' + '' + feeds.title + '' + '</div>';
// Add body
html += '<div class="rssBody">' + '<ul>';
// Add feeds
for (var i = 0; i < feeds.entries.length; i++) {
// Get individual feed
var entry = feeds.entries[i];
// Format published date
var entryDate = new Date(entry.publishedDate);
var pubDate = entryDate.toLocaleDateString() + ' ' + entryDate.toLocaleTimeString();
// Add feed row
html += '<li class="rssRow ' + row + '">' + '<' + options.titletag + '>' + entry.title + '</' + options.titletag + '>'
if (options.date) html += '<div>' + pubDate + '</div>'
if (options.content) {
// Use feed snippet if available and optioned
if (options.snippet && entry.contentSnippet != '') {
var content = entry.contentSnippet;
}
else {
var content = entry.content;
}
html += '<p>' + content + '</p>'
}
html += '</li>';
// Alternate row classes
if (row == 'odd') {
row = 'even';
}
else {
row = 'odd';
}
}
html += '</ul>' + '</div>'
$(e).html(html);
};
})(jQuery);

try change this:
html += '<li class="rssRow '+row+'">' +
'<'+ options.titletag +'>'+ entry.title +'</'+ options.titletag +'>'
to
html += '<li class="rssRow '+row+'">' +
'<'+ options.titletag +'>'+ entry.title +'</'+ options.titletag +'>'