I am accessing the following JSON data at:
http://veratech.co.nz/blog/?json=1
When I try to access the "url" property that sits within an array on line 4 of the code below, I get an undefined error. Even though it will appear in console.log (line 13) with console.log(val.attachments[0].url);.
Code below:
$.each(data.posts, function(index, val){
output += '<li>';
output += '<a href="#blogpost" onclick = showPost(' + val.id + ')">';
output += '<img src="' + val.attachments[0].url + '" alt="">';
output += '<h3>' + val.title + '</h3>';
//Here we shorten the paragraph to 60 characters.
var str = val.excerpt;
var paraInfo = str.slice(0, 60);
output += '<p>' + paraInfo + '</p>';
//Closing off the the closing html tags
output += '</a>';
output += '</li>';
console.log(val.attachments[0].url);
});//Go through each post
Advice would be greatly appreciated
I think there's something else wrong.
I downloaded the json manually, and wrote this code:
HTML:
Urls:
<ul id="foo">
</ul>
JavaScript:
function extractUrls(data) {
var $foo = $('#foo');
$.each(data.posts, function (i, p) {
$foo.append($('<li></li>').text(p.attachments[0].url));
});
}
var jsonData = { /* code omitted for brevity */ };
extractUrls(jsonData);
My output was:
Urls:
<ul id="foo">
<li>http://veratech.co.nz/blog/wp-content/uploads/2014/03/martial.jpg</li>
<li>http://veratech.co.nz/blog/wp-content/uploads/2013/12/grave.jpg</li>
<li>http://veratech.co.nz/blog/wp-content/uploads/2013/12/GTA5.jpg</li>
<li>http://veratech.co.nz/blog/wp-content/uploads/2013/10/miyagi.jpg</li>
<li>http://veratech.co.nz/blog/wp-content/uploads/2013/08/htc-box.png</li>
<li>http://veratech.co.nz/blog/wp-content/uploads/2013/08/scaffold1.jpg</li>
<li>http://veratech.co.nz/blog/wp-content/uploads/2013/07/barriera.png</li>
<li>http://veratech.co.nz/blog/wp-content/uploads/2013/06/tv.jpg</li>
</ul>
Note: You should be able to replace the var jsonData = line with:
$.get('http://veratech.co.nz/blog/', { json: 1 }, extractUrls, 'json');
Anyway; can't see what's wrong with your code? Are you sure this is the issue?
PS: I even added the following inside the $.each loop:
if (!p.attachments[0].url) {
alert(p.id + ' has undefined url!');
}
And did not see any alert...
See code running in a jsFiddle here
Related
I am working on building a movie search app. It is my first time using json. I cannot figure out why my code is not working. I have it running on localhost using xampp.
On submit
$('.search-form').submit(function (evt) {
// body...
evt.preventDefault();
var $searchBar = $('#search');
var omdbApi = 'http://www.omdbapi.com/?';
var movieSearchTerm = $searchBar.val();
var searchData = {
s:movieSearchTerm,
r:json
}
Here is the callback function
function displayMovies(data) {
// for each search result
$.each(data.items,function(i,movie) {
movieHTML += '<li class="desc">';
//movie title
movieHTML += '<a href="' + movie.Title + '" class="movie-title">';
//release year
movieHTML += '<a href="' + movie.Year + '" class="movie-year">';
//poster
movieHTML += '<img src="' + movie.Poster + '" class="movie-poster"></li>';
$('#movies').html(movieHTML);
}); // end each
// movieHTML += '</li>';
}
$.getJSON(omdbApi, searchData, displayMovies);
});//end submit
r:json
You made a typo.
You haven't created a variable called json and the service expects the value of r to be json.
String literals need to be surrounded with a pair of " or '.
data.items
And the JSON returned doesn't have items, it has Search.
In this function, the value parameter is being passed down to fill in my URL. This works perfectly.
function showResults(results) {
var html = '';
$.each(results, function(index,value) {
html += '<li><img src="' + value.snippet.thumbnails.medium.url + '">' + value.snippet.title + '(More from ' + value.snippet.channelTitle + ')</li>';
});
$('#results').html(html);
}
In this nearly identical function, the value param loses its value. I can't see how. It's difficult to debug why this is happening because console.log() just returns "ReferenceError: $ is not defined" no matter what I check (it returns this in the first section too, which works well).
function showResults(results) {
var html = '';
$.each(results, function(index,value) {
html += '<li><img src="' + value.snippet.thumbnails.medium.url + '">' + value.snippet.title + ') </li>';
});
$('#results').html(html);
$('#results li a').click(function(){
playVid($(this).attr(value.id.videoId));
});
}
function playVid(vidID) {
var embedVid = 'https://www.youtube.com/embed/'+vidID+'?autoplay=1';
document.getElementById('player').src = embedVid;
}
Here I'm trying to push the value param (in the url again) to an iframe with id="player". The iframe receives an invalid param and the video won't play. Meanwhile the video plays in the first example. Where does value get lost?
value only exists within the scope of the each loop. So, first fix your reference error, and then I suggest the following changes in that second example:
1) Update the href with the videoId value in the each loop like in the first example:
<a href="https://www.youtube.com/watch?v=' + value.id.videoId + '">
2) And then launch the player with that value:
$('#results li a').click(function(e) {
e.preventDefault();
playVid($(this).attr('href'));
});
Hi i am making a WordPress plugin that can bring the names of products from json file if someone writes products name into the search bar. But i think data.json is not getting by Ajax in WordPress. its path defining syntax error i guess.
$.getJSON('data.json', function(data)
following is complete scripting code and it was working fine in PHP website but not in WordPress.:
`jQuery('#search').keyup(function(){
var searchField = jQuery('#search').val();
var myExp = RegExp(searchField,"i");
jQuery.getJSON('data.json', function(data){
var output= '<ul class="SearchResult">';
jQuery.each(data, function(key, val){
if((val.name.search(myExp) != -1) || (val.category.search(myExp) != -1)){
output += '<li>';
output += '<h2>' + val.name + '</h2>';
output += '<img src="images/'+val.image+'.jpg" alt="sorry for image"/>';
output += '<p>' + val.category + '</p>';
output += '</li>';
}
});
output += '</ul>';
$('#update').html(output);
});
});
`
1: the file "data.json" should be in the root of your folder along with the wp-config.php file
2: check your .htaccess if you can access the "data.json" file
3: in wordpress the jquery version, you only can use jQuery instead of $ , so i can see you are using $("#update") , change it to jQuery("#update")
jQuery('#update').html(output);
I would like to achieve 2 things with this Code I have been working on so not sure if to separate the Questions:
JS:
function listPosts(data) {
postlimit =
var output='<ul data-role="listview" data-filter="true">';
$.each(data.posts,function(key,val) {
output += '<li>';
output += '<a href="#devotionpost" onclick="showPost(' + val.id + ')">';
output += '<h3>' + val.title + '</h3>';
output += '<p>' + excerpt + '</p>';
output += '</a>';
output += '</li>';
}); // go through each post
output+='</ul>';
$('#postlist').html(output);
} // lists all the posts
Questions:
1: I would like to limit the number of Dynamic List Posts returned to 8
2: While I limit the displayed items, I want to add a 'More...' text at the bottom so another set of 8 items is appended to already displayed list.
I am already trying out some codes but was hoping to get some guidance
function listPosts(data, postlimit) {
var $output = $('<ul class="posts" data-role="listview" data-filter="true">');
$.each(data.posts,function(key, val) {
$("<li>", {id: "post_" + val.id})
.append([
$("<h3>", {text: val.title}),
$("<p>", {text: val.excerpt})
])
.appendTo($output);
return (postlimit-- > 1);
});
$('#postlist').empty().append($output);
}
// exemplary delegated event handler
$(document).on("click", "ul.posts h3", function () {
$(this).show();
});
later ...
listPosts(data, 8);
Notes:
from $.each() you can return true or false. If you return false, the loop stops.
Try not to build HTML from concatenated strings. This is prone to XSS vulnerabilities that are easy to avoid. jQuery gives you the tools to build HTML safely.
Generally, for the same reason, try to avoid working with .html(), especially if you already have DOM elements to work with.
Don't use inline event handlers like onclick. At all. Ever.
I am answering you on basis of pure logic and implementation of logic. there could be API stuff for it , but I don't really know. Secondly; It would be a good solution to find some jQuery plugin if you don't have any problems with using jQuery.
call the function onMoreClick() upon clicking the More... html item
var end = 8;
var start = 1;
function onMoreClick()
{
start = end
end = end+8;
listPosts(data)
}
function listPosts(data) {
postlimit =
var output='<ul data-role="listview" data-filter="true">';
var i = start;
$.each(data.posts,function(key,val) {
if(i<end && i >=start){
output += '<li>';
output += '<a href="#devotionpost" onclick="showPost(' + val.id + ')">';
output += '<h3>' + val.title + '</h3>';
output += '<p>' + excerpt + '</p>';
output += '</a>';
output += '</li>';
i++;
}
}); // go through each post
output+='</ul>';
$('#postlist').html(output);
} // lists all the posts
So I have a Javascript script (don't judge it, i've barely used the technology before and this is in need of a tidy!)
$(document).ready(function()
{
retrieveComments();
});
function retriveComments(){
videoID = readCookie("currentVideoID");
$.get("https://gdata.youtube.com/feeds/api/videos/" +videoID+ "/comments", function(d){
$(d).find("entry").each(function(){
var $entry = $(this);
var author = $entry.attr("author");
var comment = $entry.find("content").text();
var html = '<div class="videoComments">';
html += '<p class="author">" + author + "</p>';
html += '<p class="comment"> " + comment + "</p>';
html += '</div>';
};
$('#comments').append(html);
});
And I wish to retrieve the values author and content (comment), and display it on the page. Examples I have found over the course of the day have shown 2 seperate files one with the script in and one a .jsp with the page content in, then class tags (?) corresponding to the last line (in my case #comments).
Seeing as I don't need any other content than just the data I've retrieved and the content I've built in the script, I have this:
<div id="comments"> </div>
but it doesn't display, and I can't see what I have different hin my case.
My whole page looks like:
<script type="text/javascript">
var videoID = readCookie("currentVideoID");
$(document).ready(function()
{
retrieveComments();
});
function retriveComments(){
videoID = readCookie("currentVideoID");
$.get("https://gdata.youtube.com/feeds/api/videos/" +videoID+ "/comments", function(d){
$(d).find("entry").each(function(){
var $entry = $(this);
var author = $entry.attr("author");
var comment = $entry.find("content").text();
var html = '<div class="videoComments">';
html += '<p class="author">" + author + "</p>';
html += '<p class="comment"> " + comment + "</p>';
html += '</div>';
};
$('#comments').append(html);
});
});
</script>
<h1>TEST</h1>
<div id="comments"> </div>
Any ideas how I can get that HTML to display?
Not sure what the readCookie function does (I assume it reads a cookie), but here it is without all the syntax errors and working:
$(document).ready(retriveComments);
function retriveComments() {
$.get("https://gdata.youtube.com/feeds/api/videos/jofNR_WkoCE/comments", function (d) {
$(d).find("entry").each(function (_, entry) {
var author = $(entry).find("author name").text(),
comment = $(entry).find("content").text();
html = '<div class="videoComments">';
html += '<p class="author">' + author + '</p>';
html += '<p class="comment">' + comment + '</p>';
html += '</div>';
$('#comments').append(html);
});
});
}
FIDDLE