I have chained select lists which tags for new select box generated by ajax success and data populated via AJAX response.
The is at below however, for quick summary:
on "change" event supposed to work with all select tags which name starts with "n-". But it is not.
var loading = '<div class="span3" id="loading"><div style="height:264px; background: url(/assets/frontend/img/loading_searching.gif) 50% 50% no-repeat;"></div></div>';
function count_selectes() {
return $('select').length;
}
function generate_bs_span(div_class,div_id) {
return $('<div></div>').addClass(div_class).attr('id',div_id);
}
function generate_category_select(sname, sid, sclass, soptionList) {
var els = $("<select></select>").attr("size", '15').attr("id", sid).attr("name", sname).addClass(sclass);
$.each(soptionList, function (i, data) {
els.append("<option value="+data.id_map+">" + data.map_text + "</option>");
});
return els;
}
var sDIndex = 1;
$(function() {
$('select[name^="n-"]').on('change',function(e){
alert('clicked');
var fragment = $(this);
var slID = $(this).val(); // selected_id
var dSrc = $(this).data('source'); // data-source
var dChl = $(this).find(':selected').data('children'); // data-children
var sCnt = count_selectes(); // select count
var cSID = explode('-',$(this).attr('id')); // id for current selection list
var cSSI = parseInt(cSID[1])+1; // starting index + 1 for removing unused select boxes
++sCnt;
for (var i=parseInt(cSSI);i<parseInt(sDIndex)+1;i++){$('#d-'+i).remove();}
$.ajax({
url: '/ilan/fetch_sub_categories',
data: {id:slID,dsrc:dSrc,dchl:dChl},
beforeSend:function(){
$(this).parent('div').after(loading);
},
success:function(data){
$('#loading').remove();
$(fragment).parent('div').after(generate_bs_span('span3','d-'+sCnt));
$('#'+'d-'+sCnt).html(generate_category_select('n-'+sCnt,'s-'+sCnt,'cat_select',data));
++sDIndex;
enable_select_tracking();
},
error:function(){
$('#loading').remove();
alert('ajax returns error');
}
});
});
});
new select box generated by ajax success
You need to use Event Delegation. You have to use .on() using delegated-events approach.
i.e.
$(document).on('event','selector',callback_function)
Example
$(document).on('change', 'select[name^="n-"]', function(){
//Your code
alert("clicked me");
});
In place of document you should use closest static container.
The delegated events have the advantage that they can process events from descendant elements that are added to the document at a later time. By picking an element that is guaranteed to be present at the time the delegated event handler is attached, we can use delegated events to bind the click event to dynamically created elements and also to avoid the need to frequently attach and remove event handlers.
Related
jquery function not firing when I use dataTable.fnAddData to append the HTML string.
So I have a function populateDataTable(), there are two columns I needed to render an icon instead of data from JSON.
Hence, I tried to like appending the HTML string including classes for the element in fnAddData(). But somehow it's not firing the click event on the icon.
function populateDataTable(data) {
$("#customerTable").DataTable().clear();
var length = Object.keys(data).length;
for(var i = 1; i < length+1; i++) {
var index = i - 1;
var name = data[index].name;
var queue = data[index].queue;
var expire = data[index].expire;
$('#customerTable').dataTable().fnAddData( [
i,
name,
queue,
'<td id="tb-manage-key" class="tb-manage-key"><div class="tb-btn manage-key-btn switch-view" data-hide="manageCustomers" data-title="#Resources.ManageKeys" data-target="manageKeys"><span></span></div></td>',
'<td class="tb-manage-subs"><div class="tb-btn manage-subs-btn switch-view" data-hide="manageCustomers" data-title="#Resources.ManageSubscriptions" data-target="manageSubscriptions"><span></span></div></td>',
expire,
name
]);
}}
$('.tb-btn.switch-view').on('click', function(e) {
e.preventDefault();
switchView(this);
console.log('Testing'); //not firing
});
Icon is showing, but not firing click event as it supposed to be. Attached below shows that we can see it appends the div as expected.
Solutions
Adding the click event within the populateDataTable() works.
$('#customerTable tbody').on('click', '.tb-btn.switch-view', function() {
switchView(this);
});
You can try a different syntax to listen to the click event...
$('td').on('click', '.tb-btn.switch-view', function(e) {
e.preventDefault();
switchView(this);
console.log('Testing'); //not firing
});
I'm trying to clone an element that is passed into a function and all events associated to it, as there are $('.example').on('click', function(e) ... )} events like this defined in document ready.
So I do following:
$('.example').on('click', function(e) {
e.preventDefault();
surpriseMe($(this));
});
and I try to clone this element along side its events here (I need to grab parent as .html() returns only inner html, hence element itself) :
function surpriseMe(element) {
var newElement = element.parent().clone(true,true).html();
surprise.insertBefore(element.parent());
if (numElements == 3) {
newMonth = $('<li class="item-dragable-placeholder">'+ newElement +'</li>
}
}
I believe true, true inside .clone() should force parent also grab its children events, but whenever I click on newly placed element, nothing happens
To use event delegation...
Change:
$('.example').on('click', function(e) { ...
To:
$(document).on('click', '.example', function(e) { ...
Note: Instead of using document, find the closest ancestor element (container) that's available on page load and use that.
when you do your insert, instead of inserting the new element, you ask to insert only the html, remove the html part, it will give you the element and its functionalities.
var newElement = element.parent().clone(true,true).html();
See the following (example)[http://jsfiddle.net/dshun/1j9khfnc/4/](please note, since the example code given is not complete. For example, the variable surprise, numElements are not declared. I made some assumptions in my fiddle)
$(document).ready(function(){
var numElements=0;
function surpriseMe(element) {
var newElement = element.parent().clone(true,true);
newElement.insertBefore( ".inner" );
numElements++;
if (numElements == 3) {
newMonth = $('li.item-dragable-placeholder').insert(newElement);
}
}
$('.example').on('click', function(e) {
e.preventDefault();
surpriseMe($(this));
});
});
I have added a function to jQuery prototype as below. What I want to do is when this method is invoked, generate an html form based on the arguments passed to the method and show it in a colorbox.
(function($) {
$.fn.myFunction = function(data){
var form = $('<form name="people"></form>');
var index;
for (index = 0; index < data.length; index++) {
var match = data[index];
$('<input type="radio" name="person">' + match['name'] + ' [' + match['uri'] + ']<br> ')
.attr("value", match['uri'])
.appendTo(form);
}
$('<input type="button" id="a_button" value="Add"/><br>')
.appendTo(form);
var list = $('<div>').append(form).html();
$('#a_button').click(
function(){
console.log('message from event handler');
}
);
$.colorbox({ innerWidth:420, innerHeight:315, html: list });
};
})(jQuery);
As you can see, form has a button called Add using which I hope to make an ajax request. But unfortunately click event handler attached to this button doesn't seem to be invoked.
Does anyone have any idea about what's wrong here? myFunction is actually invoked by a drupal ajax command in case if that's helpful.
You are appending the form to the DOM after attaching the event handler.
$('#a_button') searches the DOM at that specific point in time, but the form is not added to the DOM until after your call to colorbox with list as a parameter.
Try a permanent delegated event handler instead (or simply add the click handler after the colorbox line).
e.g.
$(document).on("click", "#a_button", function(){
console.log('message from event handler');
});
or
$.colorbox({ innerWidth:420, innerHeight:315, html: list });
$('#a_button').click(
function(){
console.log('message from event handler');
}
);
I have information that comes out of a database and gets put into a list with a checkbox by each element. This is how it is currently done:
function subjects(){
$.ajax({
url: "lib/search/search.subject.php",
async: "false",
success: function(response){
alert(response);
var responseArray = response.split(',');
for(var x=0;x<responseArray.length;x++){
$("#subjects").append("<br />");
$("#subjects").append(responseArray[x]);
$("#subjects").append("<input type='checkbox' />");
}
}
});
}
it works fine, but I need a way to pick up on if a checkbox is clicked, and if it is clicked then display which one was clicked, or if multiple ones are clicked.
I can't seem to find a way to pick up on the checkboxs at all.
the response variable is "math,science,technology,engineering"
Because you are populating the Checkboxes Dynamically you need to Delegate the event
$("#subjects").on("click", "input[type='checkbox']", function() {
if( $(this).is(":checked") ) {
alert('Checkbox checked')
}
});
To better capture the data it is better if you encase the corresponding data into a span , so that it can be easier to search..
$("#subjects").append('<span>'+responseArray[x] + '</span>');
$("#subjects").on("click", "input[type='checkbox']", function() {
var $this = $(this);
if( $this.is(":checked") ) {
var data = $this.prev('span').html();
alert('Current checkbox is : '+ data )
}
});
It would be best to give your dynamically injected checkboxes a class to target them better, but based on your code try:
$("#subjects").on("click", "input", function() {
if( $(this).is(":checked") ) {
// do something
}
});
Since your input elements are added dynamically, you need to use jQuery's .on() function to bind the click event to them. In your case you need to use .on() to bind to an element that exist in the DOM when the script is loaded. In your case, the element with the ID #subjects.
This note from the docs is mainly for machineghost who downvoted my answer for no apparent reason:
Event handlers are bound only to the currently selected elements; they
must exist on the page at the time your code makes the call to .on().
To ensure the elements are present and can be selected, perform event
binding inside a document ready handler for elements that are in the
HTML markup on the page. If new HTML is being injected into the page,
select the elements and attach event handlers after the new HTML is
placed into the page.
$('#subjects input[type=checkbox]').on('click',function(){
alert($(this).prop('checked'));
});
or the change event: in case someone uses a keyboard
$('#subjects input[type=checkbox]').on('change',function(){
alert($(this).prop('checked'));
});
simple fiddle example:http://jsfiddle.net/Dr8k8/
to get the array example use the index of the inputs
alert($(this).prop('checked') +'is'+ $(this).parent().find('input[type=checkbox]').index(this)+ responseArray[$(this).parent().find('input[type=checkbox]').index(this) ]);
simplified example: http://jsfiddle.net/Dr8k8/1/
EDIT: Just for an example, you could put the results in an array of all checked boxes and do somthing with that:
$('#subjects>input[type=checkbox]').on('change', function() {
var checklist = [];
$(this).parent().find('input[type=checkbox]').each(function() {
$(this).css('background-color', "lime");
var myindex = $(this).parent().find('input[type=checkbox]').index(this);
if ($(this).prop('checked') == true) {
checklist[myindex] = responseArray[myindex];
}
});
$('#currentlyChecked').text(checklist);
});
EDIT2:
I thought about this a bit and you can improve it by using .data() and query that or store it based on an event (my button called out by its id of "whatschecked")
var responseArray = ['math', 'science', 'technology', 'engineering'];// just for an example
var myList = '#subjects>input[type=checkbox]';//to reuse
for (var x = 0; x < responseArray.length; x++) {
// here we insert it all so we do not hit the DOM so many times
var iam = "<br />" + responseArray[x] + "<input type='checkbox' />";
$("#subjects").append(iam);
$(myList).last().data('subject', responseArray[x]);// add the data
}
var checklist = [];// holds most recent list set by change event
$(myList).on('change', function() {
checklist = [];
$(myList).each(function() {
var myindex = $(this).parent().find('input[type=checkbox]').index(this);
if ($(this).prop('checked') == true) {
checklist.push($(this).data('subject'));
alert('This one is checked:' + $(this).data('subject'));
}
});
});
// query the list we stored, but could query the checked list data() as well, see the .each() in the event handler for that example
$("#whatschecked").click(function() {
var numberChecked = checklist.length;
var x = 0;
for (x = 0; x < numberChecked; x++) {
alert("Number " + x + " is " + checklist[x] + " of " + numberChecked);
}
});
live example of last one: http://jsfiddle.net/Dr8k8/5/
The general pattern to do something when a checkbox input is clicked is:
$('input[type=checkbox]').click(function() {
// Do something
})
The general pattern to check whether a checkbox input is checked or not is:
var isItChecked = $('input[type=checkbox]').is(':checked');
In your particular case you'd probably want to do something like:
$('#subjects input[type=checkbox]').click(function() {
to limit the checkboxes involved to the ones inside your #subjects element.
Hi i am trying to create dropdownlists dynamically and populating the contents via an ajax call, this sort of works in the sense that the drop down is created and populated as required but its 'change' event does not fire. I am posting the code below, if anyone can spot something obvious, can you please let me know
regards
$(document).ready(function () {
$("#positions select").change(function (e) {
alert("in");
var id = $("#category_id").val();
$.getJSON("/Category/GetSubCategories/" + id, function (data) {
if (data.length > 0) {
alert(data.length);
var position = document.getElementById('positions');
var tr = position.insertRow(7);
var td1 = tr.insertCell(-1);
var td = tr.insertCell(-1);
var sel = document.createElement("select");
sel.name = 'sel';
sel.id = 'sel';
sel.setAttribute('class', 'category');
td.appendChild(sel);
$.each(data, function (GetSubCatergories, category) {
$('#sel').append($("<option></option>").
attr("value", category.category_id).
text(category.name));
});
}
});
});
});
If your drop down is dynamically generated then you have to bind the change event using .live() handler. live() attaches a handler to the event for all elements which match the current selector, now or in the future.
$("positions select").live("change", function(){
});
Edit
To get the id
$(this).attr("id");
To get value
$(this).val();
To get class name
$(this).attr("class");
inside the change event handler.