jquery image load check error - javascript

i'm trying to check if all images are loaded within a container using the below code
$(document).ready(function () {
$(".slide img").each(function (index) {
var fakeSrc = $(this).attr('src');
$("<img/>").attr("src", fakeSrc).css('display', 'none').load(function () {
alert('loaded');
}).
error(function () {
load_img_Single(fakeSrc);
});
});
function load_img_Single(img) {
alert(img);
var ruth;
$("<img/>").attr("src", img).css('display', 'none').load(function () {
ruth = 'yeap';
}).error(function () {
ruth = 'nope';
});
alert(ruth);
}
});
now as u can see im using a fake container to load the image and check if it has been loaded or not .
im using the .error in the first check of image to see if it was loaded properly or not , if not it executes the function load_img_Single(image) function of mine to load it again.
now in that function again im checking if it was loaded or not . but the problem is the variable 'ruth' is not getting set to anything within that function. its been declared outside but still its coming as 'undefined'.
any insight would be appreciated guys.

The reason is loading image is asynch. When you call:
$("<img/>").attr("src", img).css('display', 'none').load(function() {
ruth = 'yeap';
}).error(function() { ruth = 'nope'; });
The load or error do not fire yet. That's why ruth is undefined when you call alert(ruth); right after that

Related

Execute javascript once Record view is fully loaded in SugarCrm 7.2

You can add JS events in SugarCRM 7.2 by creating a custom record.js.
The problem I'm having is that they fire before the page is loaded so elements I'm trying to affect don't exist.
I have tried the following:
$(document).ready(function() { alert(0); }) // fires before page is loaded
$(document).on('load', function() { alert(1); }) // doesn't fire at all
$(window).load(function() { alert(2); }) // doesn't fire at all
Any help in resolving this would be much appreciated.
record.js
({
extendsFrom: 'RecordView',
initialize: function (options) {
this._super('initialize', [options]);
SUGAR.util.ajaxCallInProgress = function () {
alert(0);
$('[name="duplicate_button"]').hide();
},
})
The way I got this to work was to use the following code in custom/modules//clients/base/views/record/record.js
({
extendsFrom: 'AccountsRecordView',
initialize: function (options) {
this._super('initialize', [options]);
this.on("render", this.SetHomeButtons, this); //calls SetHomeButtons
},
SetHomeButtons: function () {
some code ....
},
})
The function SetHomeButtons is called once the page is loaded
Another way of doing it is to overwrite the render function to call your custom code
That doesn't work because of AJAX.
Edit: in Sugar 7 you have the function SUGAR.util.ajaxCallInProgress() it retruns false when every Request is done (all Content Elements have been loaded)

Hide loading gif after ajax callback

I have a simple question but I couldn't find a clean answer. I need to load heavy images after an ajax call and I want to use an animated gif as a pre-loader. I'm using the follow code:
function loadProducts(url) {
$("#loading").show();
$('#inner').fadeOut(1).load(url + ' .product-list', function() {
$('#inner').fadeIn(1000, function() {
$("#loading").hide();
});
});
}
The #loading is hiding when the HTML is loaded .load(url + ' .product-list'. The problem is that the heavy images are still rendering on the screen and I would like to keep showing the animated .gif until the renders of the images are finished. Is there a way to know when the images on the screen are rendered?.
Thanks in advance.
You can use promises to check when all the images have loaded, and then remove the loading gif.
This creates a promise that is resolved when the image has loaded, all the promises are kept in an array, and when all promises are resolved, i.e. all images are loaded, the callback fires.
function loadProducts(url) {
$("#loading").show();
$('#inner').fadeOut(1).load(url + ' .product-list', function() {
var promises = [];
$('#inner').find('img').each(function(_, image) {
var img = new Image(),
def = new $.Deferred();
img.onload = function() {
def.resolve();
}
promises.push( def.promise() );
img.src = image.src;
if (img.complete) img.onload();
});
$.when.apply(undefined, promises).done(function() {
$('#inner').fadeIn(1000, function() {
$("#loading").hide();
});
});
});
}
You can use ImagesLoaded
Sample usage
imagesLoaded( document.querySelector('#container'), function( instance ) {
console.log('all images are loaded');
});
// selector string
imagesLoaded( '#container', function() {...});
// multiple elements
var posts = document.querySelectorAll('.post');
imagesLoaded( posts, function() {...});
Could add/remove the loader as a class? I have base 64encoded the loader, so there is no pre loader required. This also uses a closure to allow the counter to remember its value.
var imgDiv = document.getElementById("imgDiv");
imgDiv.onclick = (function () {
"use strict";
var count = 0; // init the count to 0
return function () {
count++; //count
if (count === 1) { // do something on first click
$('.img-loader-content').addClass('loader');
$('.imgDiv').load("images/img.jpg", function () {
$('.img-loader-content').removeClass('loader');
});
}
if (count > 1) {
$('.imgDiv').slideToggle(400);
}
};
})
();
You may try using Image object. E.g:
function loadImage(url) {
$("#loading").show();
var img = new Image();
img.src = url;
img.onload = function(e) {
$("#loading").hide();
//ur code to append/show the image
};
}
the most approach to this is using onLoad , so basically after the success call of ajax , invoke another call into success function :
http://www.w3schools.com/jsref/event_onload.asp
onload is most often used within the element to execute a
script once a web page has completely loaded all content (including
images, script files, CSS files, etc.).
or use native solution like this :
<img src="w3javascript.gif" onload="loadImage()">
http://www.w3schools.com/jsref/event_img_onload.asp
Also last answer of this question is very useful in your case :
Is there something similar to `$(window).load();` for executing a function after newly inserted Ajax content has finished loading?
You can do it easily by ajaxComplete callback, here check an example http://www.w3schools.com/jquery/tryit.asp?filename=tryjquery_ajax_ajaxcomplete

Loading GIF while AJAX completes

This should be quite simple but I'll be darned if I can work it out. Just trying to get a div to display while my ajax is processing and then hide once done (I've put a sleep in there purely to test its working as locally it loads so fast I'm not sure if its working or not)!
The html page has this code in the script: -
$(document).ready(function(){
$("#loadingGIF").ajaxStart(function () {
$(this).show();
});
$("#loadingGIF").ajaxStop(function () {
window.setTimeout(partB,5000)
$(this).hide();
});
function partB(){
//just because
}
var scenarioID = ${testScenarioInstance.id}
var myData = ${results as JSON}
populateFormData(myData, scenarioID);
});
There is then a div in my page like so (which I can see in the source of the page just hidden): -
<div id="loadingGIF" ><img src='${application.contextPath}/images/spinner.gif' height="50" width="50"></div>
The ready code then goes off and calls this: -
function populateFormData(results, scenarioID) {
$table = $('#formList')
for(var i in results){
var formIDX = (results[i]["forms_idx"])
var formID = (results[i]["form_id"])
appendSubTable(formIDX, scenarioID, $table, formID);
}
}
Which references this multiple times calling several AJAX posts: -
function appendSubTable(formIDX, scenarioID, $table, formID) {
var $subTable = $table.find("#" + formIDX).find('td:eq(1)').find("div").find("table")
var url = "**Trust me this bits OK ;) **"
$.post(url, {
formIDX : formIDX, scenarioID : scenarioID, formID :formID
}, function(data) {
$subTable.append(data)
}).fail(function() {
});
}
Any pointers gratefully received...
Interestingly I bunged some alerts into my ajaxstart and stop and neither show up ever so I'm missing something obvious :S When I check the console in firefox I can see that all my POSTs are completing....
You should probably add the Ajaxstart and stop global event handlers to the document node like this
$(document).ajaxStart(function () {
$("#loadingGIF").show();
});
I realized my problem, I needed to register the ajaxstart and stop to the document not the div!
So instead of this: -
$("#loadingGIF").ajaxStart(function () {
$(this).show();
});
I now have: -
$(document).ajaxStart(function () {
$("#loadingGIF").show();
});
I assume this is because its the document that the ajax is running against not the div although my understanding there may not be 100% accurate at least this works so please tell me if I've misunderstood this! :)
#jbl, thanks for this pointer I did this to also leave the notification on screen for a few more moments just to make sure everything is loaded.

when is triggered AJAX success?

I want load some HTML document by AJAX, but I want to show it when all images in this document are loded.
$('.about').click(function () {
$(".back").load('Tour.html', function () {
$(".back").show();
});
});
".back" should be visible when all images in Tour.html are loaded, when is triggered a success event??
$(".back").load('Tour.html', function (html) {
var $imgs = $(html).find('img');
var len = $imgs.length, loaded = 0;
$imgs.one('load', function() {
loaded++;
if (loaded == len) {
$(".back").show();
}
})
.each(function () { if (this.complete) { $(this).trigger('load'); });
});
This requires at least one <img> in the returned html.
What I would suggest is to use an iframe instead. Here is some sample code in plain JavaScript:
var ifr=document.createElement("iframe");
ifr.style.display="none";
document.body.appendChild(ifr);
ifr.onload=function() {
// Do what you want with Tour.html loaded in the iframe
};
ifr.src="Tour.html";
ImagesLoaded is what you are looking for.
Place all code (ajax request in this case), when the images specified are loaded.
The plugin specifies why you cannot use load() on cached images

Loading GIF to match with the loading time of a DIV. Jquery

I have a javascript that retrieves the values checked from a set of checkboxes and loads a DIV passing those values.
Currently I show a "loading" .gif before the load of the DIV. However, it has time fixed.
I would like to set the time of this GIF until the DIV has loaded its contents completely, so the user knows that data is loading in case sometimes is slower than others.
Any idea?
Thanks!
$(function() {
$("input[type='checkbox']").on('change', function() {
var colors = [];
$("input[type='checkbox']:checked").each(function() {
colors.push(this.value);
});
if (colors.length) {
$(".loadingItems").fadeIn(300);
$(".indexMain").load('indexMain.php?color=' + colors.join("+"), function() {
$(".indexMain").fadeIn(slow);
});
$(".loadingItems").fadeOut(300);
} else {
$(".loadingItems").fadeIn(300);
$(".indexMain").load('indexMain.php', function() {
$(".loadingItems").fadeOut(300);
});
}
});
});
As suggested by #Fabricio Matte, the solution was to put the first Fade Out inside the load
inside the function launched with the load:
$(".indexMain").load('indexMain.php?color=' + colors.join("+"), function() {
$(".indexMain").fadeIn(slow);
$(".loadingItems").fadeOut(300);
});

Categories

Resources