Paging Through XML Data Using jQuery and HTML - javascript

I've got an XML file that contains a list of questions. I'd like to load the first question in the list when an HTML page loads and load the answers as radio buttons. When one of the radio buttons is selected, I'd like to display the results as well as a continue button. The continue button would go to the second element in the XML file.
So, I've got the following thus far:
function generateQuestion(i) {
$(document).ready(function() {
$.get('quiz.xml', function(d) {
alert('Loaded XML');
$(d).find('question').get(0, function() {
alert('Loaded Question');
var $question = $(this);
var questionContent = $question.attr("content");
$(questionContent).appendTo("#quizQuestion");
});
});
});
}
However, the content from the question is never loaded in the element. It looks like it hangs when I go to get the first element in the document. My guess is that there is no overload to inject the object into the function.
Am I correct? Anyone have any quick resources that shows a basic quiz-like example like I'm looking to generate?
UPDATE: I've updated the code to the following and it seems to get caught on the attribute property:
function generateQuestion(i) {
$(document).ready(function() {
$.get('quiz.xml', function(d) {
var $question = $(d).find('question').get(i);
var questionContent = $question.attr('content');
alert(questionContent);
$(questionContent).appendTo("#quizQuestion");
});
});
}
Any ideas?

the get() function returns the non-wrapped set element in this case it would be the xml element.
$.get('quiz.xml', function(d) {
var question = $(d).find('question :eq(0)');
var questionContent = question.attr('content');
alert(questionContent);
$(questionContent).appendTo("#quizQuestion");
});
the other alternative is to re-wrap the object
$.get('quiz.xml', function(d) {
var question = $(d).find('question').get(0);
var questionContent = $(question).attr('content');
alert(questionContent);
$(questionContent).appendTo("#quizQuestion");
});
Also, I'm not sure why your including the $(document).ready inside the function call. When are you calling the function. if its after the document load then you don't really need that.

Related

Load specific parts of (WordPress) next posts page via AJAX

What I'm trying to do exactly
I'm creating a custom WordPress site, it displays a "load more posts" button in the pages blog (main), category and search results. When the user clicks this button, the script retrieves the posts in the next page and appends them inside a container. Here's the code:
<script>
document.addEventListener("DOMContentLoaded", function() {
// display or not the btn when page is loaded
var morePosts = $("#dom-target").text();
if (morePosts != "true") {
$('.load-more').css('display','none');
}
// button functionality
var pageIndex = 1;
var numOfPages = Number($('#numOfPages').text()); // parsed from php
var nextLink = $('#nextLink').text(); // parsed from php
$('.load-more').click(function(){
if (pageIndex < numOfPages) {
var nextPosts;
$.get(nextLink+' .post-card', function(data){
// get articles in next page
nextPosts = data;
// append articles
$('#content').append(nextPosts);
// change value of index and redefine nextLink
pageIndex++;
nextLink = nextLink.replace(pageIndex+'/',pageIndex+1+'/');
// check if button display is still needed
if (pageIndex == numOfPages) {
$('.load-more').css('transition','all 0s');
$('.load-more').fadeOut();
}
});
}
});
});
</script>
The problem: It loads the entire page
I wonder if $.get() has a equivalent for .load('main url .specific-class'), because when I try to apply the analogous syntax
$.get(nextLink+' .post-card')
the console threw me
GET http://localhost/blog/page/2/%20.post-card 404 (Not Found)
Or if there is a way to parse the data (a string) as an HTML document (so I can apply jQuery to the variable that stores the data and get just the post cards instead of the entire page).
Thanks in advance! :)
You have to parse the response yourself which you can do simply by wrapping in $() and using any jQuery method on
$.get(nextLink, function(data){
var nextPosts = $(data).find('.post-card');
$('#content').append(nextPosts);
//.......
});

Do an action based on presence of ALT attribute with Javascript

I have some javascript which looks at the body and finds words and if one is present, it outputs a div. This is useful for many things, however...
What I need to do is also look at the body and all the ALT tags for the page as well.
I found this: Use javascript to hide element based on ALT TAG only?
Which seems to change the ALT attribute, however I want to perform an action.
Here's my JS so far.
var bodytext = $('body').text();
if(bodytext.toLowerCase().indexOf('one' || 'two')==-1)
return;
var elem = $("<div>Text Here</div>");
Thank you.
P.S. I am a N00B/ relatively new at JS, I am doing this for a small project, so I am not sure where to start for this in terms of JS functions.
Updated Answer
Try this out, I commented the code to explain it a bit.
// build array of triggers
var triggers = ['trigger1','trigger2','trigger3'];
// wait for page to load
$(function() {
// show loading overlay
$('body').append('<div id="mypluginname-overlay" style="height:100%;width:100%;background-color:#FFF;"></div>');
// check page title
var $title = $('head title');
for(trigger of triggers) {
if($($title).innerHTML.toLowerCase().indexOf(trigger) >= 0) {
$($title).innerHTML = '*censored*';
}
}
// check all meta
$('meta').each(function() {
var $meta = $(this);
for(trigger of triggers) {
if($($meta).attr('name').toLowerCase().indexOf(trigger) >= 0) {
censorPage();
return; //stop script if entire page must be censored
} else if($($meta).attr('content').toLowerCase().indexOf(trigger) >= 0) {
censorPage();
return; //stop script if entire page must be censored
}
}
});
// check all img
$('img').each(function() {
var $img = $(this);
for(trigger of triggers) {
if($($img).attr('alt').toLowerCase().indexOf(trigger) >= 0) {
censor($img);
}
}
});
// check all video
$('video').each(function() {
var $video = $(this);
for(trigger of triggers) {
if($($video).attr('alt').toLowerCase().indexOf(trigger) >= 0) {
censor($video);
}
}
});
// if you want to be extra careful and check things like background image name,
// you'll have to run this code here - very inefficent
// but necessary if you want to check every single element's background image name:
for($element of $('body').children()) {
for(trigger of triggers) {
if($($element).css('background-image').toLowerCase().indexOf(trigger) >= 0) {
$($element).css('background-image','');
}
}
}
, function() { // Not sure if this is totally correct syntax, but use a callback function to determine when
// when the rest of the script has finished running
// hide overlay
$('#mypluginname-overlay').fadeOut(500);
}});
function censor($element) {
// just a basic example, you'll probably want to make this more complex to overlay it properly
$element.innerHTML = 'new content';
}
function censorPage() {
// just a basic example, you'll probably want to make this more complex to overlay it properly
$('body').innerHTML = 'new content';
}
---Original Answer---
I'm not sure exactly what you would like to do here, you should add more detail. However if you choose to use jQuery, it provides tons of useful methods including the method .attr(), which lets you get the value of any attribute of any element.
Example:
var alt = $('#my-selector').attr('alt');
if (alt == 'whatYouWant') {
alert('yay');
} else {
alert('nay');
}
You're using jQuery lib, you could select elements by attribute like:
$('[alt="one"]').each(function(el){
// do something
var x = $(el).arrt('alt');
});
If you use selector $('[alt]') you can get elements that have this attribute set, and then check the value of the element if you have a more complicated selection.
Than you have to change your return, as you could not put a div inside an ALT tag, it didn't work.
Here is about what is your expected output.
UPDATE
As you want to change all images and video in a page, the way to do this with jquery is through $.replaceWith():
$('img,video').replaceWith($('<div>Text Here</div>'));
If you need to filter the elements:
$('img,video').each(function(el){
if($(el).prop('tagName') == 'IMG' &&
$(el).attr('alt') == 'the text...') {
$(el).replaceWith($('<div>Text Here</div>'));
}
})
But I'm not an expert on Chrome Extensions, I just put this code here in jQuery, as you was using jQuery.
Of course it could be done, with much code with plain javascript and the DOM API.

Calling javascript function in html second time

Below is my code for a simple text based game that i am trying to make but i cannot understand why the first time i call my function with a hyperlink 'link1', it works but when i add another link to my html document using javascript, and try to call another function onclick upon that link, it doesn't work. can somebody explain?
var getupvar = document.getElementById("attack");
getupvar.onclick = attack;
function attack() {
$('<p> Some text </p>').insertBefore("#placeHolder");
$('link2').insertBefore("#placeHolder");
}
var link2event = document.getElementById("defend");
link2event.onclick = defend;
function defend() {
alert("working now");
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div id="console">
<p id="startGameMessage"></p>
<div id="gameArea">
<p id="gameMessage">Some Text</p>
link1
<div id="placeHolder"></div>
</div>
</div>
When you link up your attack onclick, the element exists. But because #defend does not exist on the dom when you run var link2event = document.getElementById("defend");, your onclick never gets set.
Instead try:
var getupvar = document.getElementById("attack");
getupvar.onclick = attack;
function attack(){
$('<p> Some text </p>').insertBefore("#placeHolder");
$('link2').insertBefore("#placeHolder");
var link2event = document.getElementById("defend");
link2event.onclick= defend;
}
function defend(){
alert("working now");
}
jsfiddle https://jsfiddle.net/fv9mpbm6/
This will get your code working how you wish. If you don't do so, your code cannot work because the two lines added to the attack() function will be executed when you call the .js file in your html document as a script and not as a function. This means that the method getElementById("defend") will not find anything, because when you initialize the page, you cannot find any element with this id, you create it when you click on the link.
But do note that if you click attack more than once, your code will break because there will be more than one defend element.
When creating dynamic content, never use ids for handlers! Use classes instead
function attack() {
$('link2').insertBefore("#placeHolder");
}
Also, to ensure proper handling for elements that may not exist yet, leverage jquery's on functionality
$('body').on('click', '.defend', function() {
alert("working now")
})
it is simple, just put the two lines of code
var link2event = document.getElementById("defend");
link2event.onclick= defend;
inside the attack() function, at the end,and it works. This is the new attack() function:
function attack(){
$('<p> Some text </p>').insertBefore("#placeHolder");
$('link2').insertBefore("#placeHolder");
var link2event = document.getElementById("defend");
link2event.onclick= defend;}
If you don't do so this code cannot works because these two lines will be executed when you call the .js file in your html document as a script and not as a function. This means that the method getElementById("defend") will not find nothing, because when you initialize the page, you cannot find any element with this id, you create it when you click on the link.
I hope that this helps!
Cheers!
Try this, I am not sure is this what you expect
var getupvar = document.getElementById("attack"), i=0;
getupvar.onclick = attack;
function attack() {
$('<p> Some text </p>').insertBefore("#placeHolder");
$('link2').insertBefore("#placeHolder");
var link2event = document.getElementById("defend"+i);
link2event.onclick = defend;
i++;
}
function defend() {
alert("working now");
}

How do i call a spcific jquery function form within another function?

I have the following code which is not working
jQuery
jQuery(window).bind("load", function() {
function effects(content_name,active_name)
{
// switch all tabs off
$(active_name).removeClass("active");
// switch this tab on
$(this).addClass("active");
// slide all content up
$(content_name).slideUp();
// slide this content up
var content_show = $(this).attr("title");
$("#"+content_show).slideDown();
}
$("a.tab_1").click(function () {
var content_name = '.content_a';
var active_name = 'a.tab_1.active';
effects(content_name,active_name);
});
$("a.tab_2").click(function () {
var content_name = '.content_b';
var active_name = 'a.tab_2.active';
effects(content_name,active_name);
});
$("a.tab_3").click(function () {
var content_name = '.content_c';
var active_name = 'a.tab_3.active';
effects(content_name,active_name);//create effects with the content
});
});
Its a set of tab groups upto 8 in number. Writing individual functions will have an adverse effect on loading time.
Answer 2 hours later:
Thank you all for pointing out the "effetcs" mistake in the code.
The other mistake was I was doing was not passing "$(this)" as a parameter into the called function "effects".
I Have adjoined the link where the necessary changes are done and the code works.
[jsfiddle] http://jsfiddle.net/phyGS/2/
Replace effetcs with effects at the first block, and replace every occurrence of
effects(content_name,active_name);
with
effects.call(this, content_name, active_name);
This call method assigns a new value to the this property of function effects.

Find specific div with RegEx and print content

I'm trying to pull some text from an external website using this script.
It works perfectly, but it gets the entire page. I want to take only the content inside a specific div with the class 'content'. The entire page is put inside the variable 'data', and then this function is created to strip some tags:
function filterData(data){
data = data.replace(/<?\/body[^>]*>/g,'');
data = data.replace(/[\r|\n]+/g,'');
data = data.replace(/<--[\S\s]*?-->/g,'');
data = data.replace(/<noscript[^>]*>[\S\s]*?<\/noscript>/g,'');
data = data.replace(/<script[^>]*>[\S\s]*?<\/script>/g,'');
data = data.replace(/<script.*\/>/,'');
return data;
}
How would I go about finding the div with the class 'content' and only viewing the content inside that?
UPDATE: Sorry about using RegExes — can you help me to get the content without using RegEx? So, this is my HTML file:
erg
<div id="target" style="width:200px;height:500px;"></div>
<div id="code" style="width:200px;height:200px;"></div>
<script src="http://code.jquery.com/jquery.min.js"></script>
<script>
$(document).ready(function(){
var container = $('#target');
$('.ajaxtrigger').click(function(){
doAjax($(this).attr('href'));
return false;
});
function doAjax(url){
if(url.match('^http')){
$.getJSON("http://query.yahooapis.com/v1/public/yql?"+
"q=select%20*%20from%20html%20where%20url%3D%22"+
encodeURIComponent(url)+
"%22&format=xml'&callback=?",
function(data){
if(data.results[0]){
var tree = string2dom(data.results[0]);
container.html($("div.content", tree.doc));tree.destroy();
} else {
var errormsg = '<p>Error: could not load the page.</p>';
container.html(errormsg);
}
}
);
} else {
$('#target').load(url);
}
}
function filterData(data){
return tree;
}
});
</script>
Try something like this:
var matches = data.match(/<div class="content">([^<]*)<\/div>/);
if (matches)
return matches[1]; // div content
try this:
<div\b[^>]*class="content"[^>]*>([\s\S]*?)<\/div>
Here try this :
<div[^>]*?class='content'[^>]*?>(.*?)</div>
Captured reference /1 will have your content. Although you shouldn't be doing this with regexes :)
this may help you:
var divtxt = match(/<div[^>]*class="content"[^>]>.*<\/div>/);
but it may stop at the wrong .
you should use jquery or prototype to make it a dom-object and use selectors to find the right div.
using jquery you would do something like:
var divtxt = $(data).find(".content").first().html();
remember to load the jquery library first.

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