I'm getting an error when parsing checkboxes in a table that is loaded with AJAX, but I get an error saying the widget with that id is already registered:
"Error('Tried to register widget with id==userListUncheckAll but that id is already registered')"
And I'm guessing this happens because we take out the current table, then replace it with what ever we get back from the AJAX call, and thus the element id's would be the same. Is there a way to "unregister" the widgets or something similar?
I found the answer for this myself, so I'll put it here for others:
If you have a set of id's that you know will need to be "unregistered", create an array of the id names:
try {
dojo.parser.parse();
} catch (e) {
var ids = ['id1', 'id2', 'id3'];
dijit.registry.forEach(function(widget) {
//remove this check if you want to unregister all widgets
if (dojo.indexOf(ids, id) {
widget.destroyRecursive();
}
});
dojo.parser.parse();
}
Works like a charm.
Get the parent node that you are inserting the AJAX content into and parse ONLY this node. You are getting this error because other widgets in your DOM are getting parsed twice. Something like this:
require(["dojo/dom", "dojo/parser", "dojo/_base/xhr"/*, etc */ ],
function(dom, parser, xhr) {
var request = xhr.get({
// your details here
});
request.then(function(data) {
// transform data if necessary
var parentNode = dom.byId("/* parent id */");
parentNode.innerHTML = data;
// This is where the widgets get built!
parser.parse(parentNode); // or parser.parse("/* parent id */");
}, function(err) {
// handle error
});
});
Also, make sure you include the right dojo / dijit modules. A common mistake is to forget to include the modules for the widgets that you are trying to insert. For example, if you are using TabContainer, add "dijit/layout/TabContainer" to the list of required modules.
Within the Dojo Parser documentation is included this code snipet:
dojo.xhrGet({
url: "widgets.html",
load: function(data){
dojo.byId("container").innerHTML = data;
dojo.parser.parse("container");
}
})
I applied in my code and works fine.
Related
I'm using ajax within the play (scala) framework to run some code after a click event occurs on a page. I want to return the results of that code execution on the same page.
EDIT: the goal of this is to display some rows from the database, along with form elements to fill out to update cells of the databse, all without reloading/or going to a new page
Is there a way to pass html + (scala) values into
Ok(...).as(HTML)
to display without directing to new a page?
I know Ok can take things like:
Ok(<h1>it works</h1>).as(HTML)
but I can't figure out how to combine that with scala values as well. Is there a smarter way to do this?
EDIT: the ajax looks like this:
var ajaxCall = function() {
var ajaxCallBack = {
success : onSuccess,
error : onError
}
jsRoutes.controllers.Application.scrape().ajax(ajaxCallBack);
};
var onSuccess = function(data) {
$("#results").append(data);
}
var onError = function(error) {
alert(error);
}
For sure you can. You can use TWIRL templates:
Create a template "views/Application/contacts.scala.html
#(users: List[User])
<h1>Users</h1>
<ul>
#for(user <- users) {
<li>#user.name</li>
}
</ul>
in the controller:
Ok(views.html.Application.contacts(users))
I have links on a table to edit or delete elements, that elements can be filtered. I filtered and get the result using ajax and get functions. After that I added (display) the result on the table using inner.html, the issue here is that after filtering the links on the elements not work, cause a have the dojo function like this
dojo.ready(function(){
dojo.query(".delete-link").onclick(function(el){
var rowToDelete = dojo.attr(this,"name");
if(confirm("Really delete?")){
.......
}
});
I need to trigger the event after filtering, any idea?
(I'm assuming that you're using Dojo <= 1.5 here.)
The quick answer is that you need to extract the code in your dojo.ready into a separate function, and call that function at the end of your Ajax call's load() callback. For example, make a function like this:
var attachDeleteEvents = function()
dojo.query(".delete-link").onclick(function(el){
var rowToDelete = dojo.attr(this,"name");
if(confirm("Really delete?")){
.......
}
});
};
Then you call this function both in dojo.ready and when your Ajax call completes:
dojo.ready(function() { attachDeleteEvents(); });
....
var filter = function(someFilter) {
dojo.xhrGet({
url: "some/url.html?filter=someFilter",
handleAs: "text",
load: function(newRows) {
getTableBody().innerHTML = newRows;
attachDeleteEvents();
}
});
};
That was the quick answer. Another thing that you may want to look into is event delegation. What happens in the code above is that every row gets an onclick event handler. You could just as well have a single event handler on the table itself. That would mean there would be no need to reattach event handlers to the new rows when you filter the table.
In recent versions of Dojo, you could get some help from dojo/on - something along the lines of:
require(["dojo/on"], function(on) {
on(document.getElementById("theTableBody"), "a:click", function(evt) {...});
This would be a single event handler on the whole table body, but your event listener would only be called for clicks on the <a> element.
Because (I'm assuming) you're using 1.5 or below, you'll have to do it a bit differently. We'll still only get one event listener for the whole table body, but we have to make sure we only act on clicks on the <a> (or a child element) ourselves.
dojo.connect(tableBody, "click", function(evt) {
var a = null, name = null;
// Bubble up the DOM to find the actual link element (which
// has the data attribute), because the evt.target may be a
// child element (e.g. the span). We also guard against
// bubbling beyond the table body itself.
for(a = evt.target;
a != tableBody && a.nodeName !== "A";
a = a.parentNode);
name = dojo.attr(a, "data-yourapp-name");
if(name && confirm("Really delete " + name + "?")) {
alert("Will delete " + name);
}
});
Example: http://fiddle.jshell.net/qCZhs/1/
I'm using the JQuery plugin customSelect() http://adam.co/lab/jquery/customselect/ to style dropdown boxes.
If I initialize the script more than once on the same elements, they cease to work. I need to figure out a way to only initialize the plugin on newly created elements inserted into the DOM through AJAX.
So, I initialize it on all drop downs (the desired effect) -
$('select').customSelect();
and elements that I select this plugin work for are given a class of "hasCustomSelect", like so
<select class="hasCustomSelect"></select>
but if I initialize twice -
$('select').customSelect();
$('select').customSelect();
it will literally stop working.
So, in my AJAX request, I have it initializing on elements WITHOUT that class, but it doesn't seem to be working. Here is the AJAX -
$.ajax({
type: 'POST',
url: 'wp-content/themes/themetitle/functions/get-child.php',
data: { childID : theID, URL : theURL, classlevel : classlevel },
beforeSend:function() {
},
success:function(data) {
$('#makesort').append(data);
makesort();
$.each('select', function() {
if( $(this).hasClass('hasCustomSelect') ) {
//DO NOTHING!
} else {
$(this).customSelect();
}
});
},
error:function() {
}
});
So, the thought I had was after the data is appended to my div, I'll go through each <select> element, determine if it already contains the class hasCustomSelect, and if not, then initialize the plugin for this element.
This doesn't seem to have the desired effect, however, and in fact, it's producing an error. There are probably several ways to see if a plugin is already applied, but I thought checking to see if the default class that's added is there would be sufficient.
Try this for your each:
$('select:not(.hasCustomSelect)').each(function() {
$(this).customSelect();
});
or...
$.each($('select:not(.hasCustomSelect)'), function() {
$(this).customSelect();
});
The reason you're getting an error is because the first parameter to $.each(... is a collection of objects, not a selector.
As far as I can tell, Backbone.js view represents DOM element. I take it from existing DOM or create it on the fly in el attribute.
In my case, I want to take it from server with AJAX request because I'm using Django templates and don't want to rewrite everything to JavaScript templates.
So I define el function that performs AJAX request.
el: function() {
model.fetch().success(function(response) {
return response.template
})
}
Of course, it does NOT work because AJAX request is executed asynchronous.
This means that I don't have el attribute and events does NOT work neither. Can I fix it?
Maybe the Backbone.js framework isn't the right tool for my needs? The reason I want to use that was to have some structure for the code.
P.S. I'm new to Backbone.js.
Do your ajax request from another view, or directly after the page load using jquery directly, and after you've downloaded your template, THEN instantiate your backbone view class with the proper id/el or whatever (depending on where you stored your ajax fetched template). Depending on your use-case, this may or may not be a sensible approach.
Another, perhaps more typical approach, would be to set up your view with some placeholder element (saying "loading" or whatever), then fire off the ajax, and after the updated template has been retrieved, then update your view accordingly (replace the placeholder with the actual template you requested).
When/if you update your view with new/other DOM elements, you need to call the view's delegateEvents method to rebind your events to the new elements, see:
http://backbonejs.org/#View-delegateEvents
I came across a similar requirement. In my instance, I was running asp.net and wanted to pull my templates from user controls. The first thing I would recommend is looking into Marionette because it will save you from writing a lot of boiler plate code in Backbone. The next step is to override how your templates are loaded. In this case I created a function that uses Ajax to retrieve the HTML from the server. I found an example of this function where they were using it to pull down html pages so I did a little modification so I can make MVC type requests. I can't remember where I found the idea from; otherwise, I would give the link here.
function JackTemplateLoader(params) {
if (typeof params === 'undefined') params = {};
var TEMPLATE_DIR = params.dir || '';
var file_cache = {};
function get_filename(name) {
if (name.indexOf('-') > -1) name = name.substring(0, name.indexOf('-'));
return TEMPLATE_DIR + name;
}
this.get_template = function (name) {
var template;
var file = get_filename(name);
var file_content;
var result;
if (!(file_content = file_cache[name])) {
$.ajax({
url: file,
async: false,
success: function (data) {
file_content = data; // wrap top-level templates for selection
file_cache[name] = file_content;
}
});
}
//return file_content.find('#' + name).html();
return file_content;
}
this.clear_cache = function () {
template_cache = {};
};
}
The third step would be to override Marionette's method to load templates. I did this in the app.addInitializer method. Here I am initializing my template loader and setting it's directory to a route handler. So when I want to load a template, I just set the template: "templatename" in my view and Backbone will load the template from api/ApplicationScreens/templatename. I am also overriding my template compiling to use Handlebars because ASP.net is not impressed with the <%= %> syntax.
app.JackTemplateLoader = new JackTemplateLoader({ dir: "/api/ApplicationScreens/", ext: '' });
Backbone.Marionette.TemplateCache.prototype.loadTemplate = function (name) {
if (name == undefined) {
return "";
} else {
var template = app.JackTemplateLoader.get_template(name);
return template;
}
};
// compiling
Backbone.Marionette.TemplateCache.prototype.compileTemplate = function (rawTemplate) {
var compiled = Handlebars.compile(rawTemplate);
return compiled;
};
// rendering
Backbone.Marionette.Renderer.render = function (template, data) {
var template = Marionette.TemplateCache.get(template);
return template(data);
}
Hopefully this helps. I've been working on a large dynamic website and it is coming along very nicely. I am constantly being surprised by the overall functionality and flow of using Marionette and Backbone.js.
The Story So far....
Trying to learn JS and JQuery and i thought i would start with the basics and try alittle AJAX "search as you type" magic. Firstly i just wanted to get the AJAX part right and iterating through the return JSON object and appending it to a unordered list. Im doing no validation on the inputted value vs. the returned JSON results at this time, i just want a controlled way of when to do the AJAX getJSON call. Later i will do the validation once i get this right.
Anyways im having trouble displaying the Account Numbers in in the ul. At the moment the only thing that is being displayed is AccountNumber in the li and not my ACCOUNT NUMBERS
My JS Code is here:
http://jsfiddle.net/garfbradaz/HBYvq/54/
but for ease its here as well:
$(document).ready(function() {
$("#livesearchinput").keydown(function(key) {
$.ajaxSetup({
cache: false
});
$.getJSON(" /gh/get/response.json//garfbradaz/MvcLiveSearch/tree/master/JSFiddleAjaxReponses/", function(JSONData) {
$('<ul>').attr({
id: "live-list"
}).appendTo('div#livesearchesults');
$.each(JSONData, function(i, item) {
var li = $('<li>').append(i).appendTo('ul#live-list');
//debugger;
});
});
});
});
My JSON file is hosted on github, but again for ease, here it is:
https://github.com/garfbradaz/MvcLiveSearch/blob/master/JSFiddleAjaxReponses/demo.response.json
{
"AccountNumber": [
1000014,
1015454,
1000013,
1000012,
12
]
}
Also here is my Fiddler results proving my JSON object is being returned.
EDIT:
There were so queries about what i was trying to achieve, so here it goes:
Learn JQuery
To build a "Search as you Type" input box. Firstly i wanted to get the AJAX part right first, then i was going to build an MVC3 (ASP.NET) Application that utilises this functionality, plus tidy up the JQuery code which includes validation for the input vs. the returned JSON.
Cheesos answer below worked for me and the JSFiddle can be found here:
http://jsfiddle.net/garfbradaz/JYdTU/
First, I think keydown is probably the wrong time to do the json call, or at least... it's wrong to do a json call with every keydown. That's too many calls. If I type "hello" in the input box, within about .8 seconds, then there are 5 json requests and responses.
But you could make it so that it retrieves the json only the first time through, using a flag.
Something like this:
$(document).ready(function() {
var $input = $("#livesearchinput"), filled = false;
$.ajaxSetup({ cache: false });
$input.keydown(function(key) {
if (!filled) {
filled = true;
$.getJSON("json101.js", function(JSONData) {
var $ul =
$('<ul>')
.attr({id: "live-list"})
.appendTo('div#livesearchesults');
$.each(JSONData, function(i, item) {
$.each(item, function(j, val) {
$('<li>').append(val).appendTo($ul);
});
});
});
}
});
});
The key thing there is I've used an inner $.each().
The outer $.each() is probably unnecessary. The JSON you receive has exactly one element in the object - "AccountNumber", which is an array. So you don't need to iterate over all the items in the object.
That might look like this:
$.each(JSONData.AccountNumber, function(i, item) {
$('<li>').append(item).appendTo($ul);
});
What you probably want is this:
$.each(JSONData.AccountNumber, function(i, item) {
var li = $('<li>').append(item).appendTo('ul#live-list');
});
Your code:
$.each(JSONData, function(i, item) {
var li = $('<li>').append(i).appendTo('ul#live-list');
});
Says "iterate over the keys and values of the outer JSON structure, and print the keys". The first key is "AccountNumber", so you end up printing that.
What you want to do is iterate over the array stored at JSONData.AccountNumber, and print the values:
$.each(JSONData.AccountNumber, function() {
var li = $('<li>').append(this).appendTo('ul#live-list');
});