为什么我的img错误函数失败了？
B. *_*non 7 html javascript jquery razor asp.net-webpages
我动态构建的一些img元素可能(do)失败.对于这些情况,我从这里得到了一些代码:有没有办法以编程方式确定图像链接是坏的？即:
function getNatlBookCritics() {
var htmlBuilder = '';
// Doesn't do diddly-squat - wrong spot for it?
$('img').error(function () {
$(this).attr("src", "Content/NoImageAvailable.png");
});
$.getJSON('Content/NBCCJr.json', function (data) {
$.each(data, function (i, dataPoint) {
. . .
......但它不起作用.Warum nicht？
UPDATE
将此代码放在$ .getJSON()调用的.each部分中:
var jObject = $('<img src=\"' + dataPoint.imghref + '\"/>');
$(jObject).error(function () {
$(this).attr("src", "Content/NoImageAvailable.jpg");
});
...... 所有图像都失败了.dataPoint.imghref包含以下值:
http://www.amazon.com/exec/obidos/ASIN/B00655KLOY/garrphotgall-20
更新2
在一个坚果地狱,我正在添加"img src",如下所示:
function getNatlBookCritics() {
var htmlBuilder = '';
$.getJSON('Content/nbcc.json', function (data) {
$.each(data, function (i, dataPoint) {
if (IsYear(dataPoint.category)) {
htmlBuilder += '<div class=\"yearBanner\">' + dataPoint.category + '</div>';
} else {
htmlBuilder += '<section class=\"wrapper\" ><a id=\"mainImage\" class=\"floatLeft\" href=\"' +
dataPoint.imghref + '\"' + ' target=\"_blank\"><img height=\"160\" width=\"107\" src=\"' +
dataPoint.imgsrc + '\"' +
dataPoint.imgalt + '></img></a>' +
. . .
htmlBuilder += '</section>';
}
// this is where I had the img err code
}); //each
$('#BooksContent').append(htmlBuilder);
}); //getNatlBookCritics
...所以你可以看到img被添加到DOM中; 也许事实上,我的img有高度和宽度属性是问题...
更新3
ManMohan Vyas:你的意思是这样的:
}); //each
$('#BooksContent').append(htmlBuilder).
find("img").error(function(){
$(this).attr("src", "Content/NoImageAvailable.png");
});
}); //getJSON()
？
更新4
这个:
var jObject = $(htmlBuilder);
jObject.find("img").error(function () {
$(this).attr("src", "Content/NoImageAvailable.png");
});
$('#BooksContent').append(jObject);
......没用
和FWIW,改变这个:
$('#BooksContent').html('');
. . . $('#BooksContent').append(htmlBuilder);
...to this:
$('#BooksContent').replaceWith(htmlBuilder);
...didn't work well (the right stuff populated, but the formatting got all messed up (instead of a solid black background, each section had a black background, but the overall background was silver).
UPDATE 5
I just thought of something that may be causing my problem: the images that I'm attempting to show are all jpgs, but the "Image Not Available" image is a png. Does that make a difference? Is that possibly what is causing the rendering engine to get confused? If so, I'll just save the fallback img as a jpg...
UPDATE 6
Nope, these last two attempts didn't work either. I tried Joseph Myers idea, then Prestauls, as I changed this:
dataPoint.imghref + '\"' + ' onerror=\"imgError(this);\" target=\"_blank\"><img height=\"160\" width=\"107\" src=\"' +
dataPoint.imgsrc + '\"' +
..to this:
dataPoint.imgsrc + '\" onerror=\"imgError(this);\"' +
dataPoint.imgalt + '></img></a>' +
...and no difference. I asked this on the jQuery forum a bit ago: I'm grasping at straws here, but I wonder if having mismatched jQuery/jQueryUI versions could be the problem? In order to support older browsers, I'm still using jQuery 1.9.1, but am on the "bleeding edge" as regards jQueryUI with version 1.10.3.
UPDATE 7
Okay, here's all the pertinent code (some redundant and moot code that will be refactored out has been elided to comply with SO's length limits). The (static) CSS shouldn't matter, right? The only other "code" is Web.config and things of that nature, so none of that should be having an effect on why I can't get the fallback images to display.
A lot of my failed attempts to get NoImageAvailable.png to display are commented out.
@{
Layout = "~/_SiteLayout.cshtml";
Page.Title = "My Next Winner";
}
<div id="tabs" class="content-wrapper">
<ul>
<li><a href="#tab-Books">Books</a></li>
<li><a href="#tab-Movies">Movies</a></li>
<li><a href="#tab-Music">Music</a></li>
</ul>
<div id="tab-Books">
<select id="bookDropDown">
<option value="Pulitzer">Pulitzer</option>
<option value="NBCC">National Book Critics Circle</option>
<option value="NBA">National Book Awards</option>
<option value="NOBA">National Outdoors Book Awards</option>
</select>
<div id="BooksContent" class="clearfix">Content in Books tab</div>
</div>
<div id="tab-Movies">
. . . . . .
<script>
$.ajaxSetup({ cache: false });
var currentBookSelection = '';
var currentMovieSelection = '';
var currentMusicSelection = '';
function imgError(image) {
image.onerror = "";
image.src = "Content/NoImageAvailable.png";
return true;
}
// BOOKS
// TODO: Refactor: just have one "getBooks()" function, passing in the name of the json file
function getNatlBookCritics() {
var htmlBuilder = '';
$.getJSON('Content/nbcc.json', function (data) {
$.each(data, function (i, dataPoint) {
if (IsYear(dataPoint.category)) {
htmlBuilder += '<div class=\"yearBanner\">' + dataPoint.category + '</div>';
} else { // see snippet at top of unit for dealing with landscape-oriented books (such as some children's books) to change height and width of img
htmlBuilder += '<section class=\"wrapper\" ><a id=\"mainImage\" class=\"floatLeft\" href=\"' +
dataPoint.imghref + '\"' + ' target=\"_blank\"><img height=\"160\" width=\"107\" src=\"' +
//dataPoint.imghref + '\"' + ' onerror=\"imgError(this);\" target=\"_blank\"><img height=\"160\" width=\"107\" src=\"' +
//dataPoint.imgsrc + '\" onerror=\"imgError(this);\"' +
dataPoint.imgsrc + '\"' +
dataPoint.imgalt + '></img></a>' +
'<div id=\"prizeCategory\" class=\"category\">' +
dataPoint.category +
'</div><br/><cite id=\"prizeTitle\" >' +
dataPoint.title +
'</cite><br/><div id=\"prizeArtist\" class=\"author\">' +
dataPoint.author +
'</div><br/>';
if (dataPoint.kindle.trim().length > 2) {
htmlBuilder += '<button><a href=\"' + Urlify(dataPoint.kindle) + '\"' +
' target=\"_blank\">Kindle</a></button>';
}
if (dataPoint.paperback.trim().length > 2) {
htmlBuilder += '<button><a href=\"' + Urlify(dataPoint.paperback) + '\"' +
' target=\"_blank\">Paperback</a></button>';
}
if (dataPoint.hardbound.trim().length > 2) {
htmlBuilder += '<button><a href=\"' + Urlify(dataPoint.hardbound) + '\"' +
' target=\"_blank\">Hardcover</a></button>';
}
htmlBuilder += '</section>';
//// Doesn't work
//$('img').error(function () {
// $(this).attr("src", "Content/NoImageAvailable.png");
//});
// When get answer, try this: <-- they all fail with this
//var jObject = $('<img src=\"' + dataPoint.imghref + '\"/>');
//var jObject = $('<img src=' + dataPoint.imghref + ' />');
//$(jObject).error(function () {
// $(this).attr("src", "Content/NoImageAvailable.jpg");
//});
}
}); //each
//var jObject = $(htmlBuilder).find('img').error(function () {
// $(this).attr("src", "Content/NoImageAvailable.png")
//});
//$("#BooksContent").html(jObject);
//var jObject = $(htmlBuilder);
//jObject.find("img").error(function () {
// $(this).attr("src", "Content/NoImageAvailable.png");
//});
//$('#BooksContent').append(jObject);
// 7/23
//imageError = function (it) {
// $(it).attr("src", "Content/NoImageAvailable.png");
//};
//htmlBuilder = htmlBuilder.replace(/<img/g, '<img onerror="imageError(this)"');
//var jObject = $(htmlBuilder);
//$("#BooksContent").html(jObject);
// </ 7/23
//$('#BooksContent').html('');
//$('#BooksContent').append(htmlBuilder);
////try this 7/24/2013
//var $jObject = $('<img>');
//$jObject.error(function () { //$jObject is already a jquery object, don't wrap it again
// $(this).attr("src", "Content/NoImageAvailable.jpg");
//}).attr('src', dataPoint.imghref);
//</try this 7/24/2013
//$('#BooksContent').html(htmlBuilder);
$('#BooksContent').html(htmlBuilder).
find('img, button').click(function (evt) {
$(this).css('border', '1px solid red')
//evt.preventDefault();
//find('img').error(function() {
// this.src = "/Content/NoImageAvailable.png"
//})
});
//$('#BooksContent').replaceWith(htmlBuilder);
//.find('img').error(function() {
// this.src = "Content/NoImageAvailable.png"
// //this.src = "http://www.gravatar.com/avatar/317f4b62da2b0186feac9b6209793505?s=80&d=http%3A%2F%2Fimg.zohostatic.com%2Fdiscussions%2Fv1%2Fimages%2FdefaultPhoto.png";
//});
$('#BooksContent').css('background-color', 'black');
$('button').button();
}); //getJSONnbcc
$largest = 0;
$(".wrapper").each(function () {
if ($(this).height() > $largest) {
$largest = $(this).height();
}
});
$(".wrapper").css("height", $largest);
} // getNatlBookCritics()
function getPulitzers() {
// Since pulitzers will be the one that shows when site first opens, added rel="nofollow"
// in each href; in this way only this method differs from the other "getX" book methods
var htmlBuilder = '';
$.getJSON('Content/pulitzers2.json', function (data) {
$.each(data, function (i, dataPoint) {
if (IsYear(dataPoint.category)) {
htmlBuilder += '<div class=\"yearBanner\">' + dataPoint.category + '</div>';
} else { // see snippet at top of unit for dealing with landscape-oriented books (such as some children's books) to change height and width of img
htmlBuilder += '<section class=\"wrapper\" ><a id=\"mainImage\" class=\"floatLeft\" href=\"' +
dataPoint.imghref + '\"' + ' target=\"_blank\"><img height=\"160\" width=\"107\" src=\"' +
dataPoint.imgsrc + '\"' +
dataPoint.imgalt + '></img></a>' +
'<div id=\"prizeCategory\" class=\"category\">' +
dataPoint.category +
'</div><br/><cite id=\"prizeTitle\" >' +
dataPoint.title +
'</cite><br/><div id=\"prizeArtist\" class=\"author\">' +
dataPoint.author +
'</div><br/>';
if (dataPoint.kindle.trim().length > 2) {
htmlBuilder += '<button><a href=\"' + Urlify(dataPoint.kindle) + '\"' +
' target=\"_blank\" rel=\"nofollow\" >Kindle</a></button>';
}
if (dataPoint.hardbound.trim().length > 2) {
htmlBuilder += '<button><a href=\"' + Urlify(dataPoint.hardbound) + '\"' +
' target=\"_blank\" rel=\"nofollow\" >Hardcover</a></button>';
}
if (dataPoint.paperback.trim().length > 2) {
htmlBuilder += '<button><a href=\"' + Urlify(dataPoint.paperback) + '\"' +
' target=\"_blank\" rel=\"nofollow\" >Paperback</a></button>';
}
htmlBuilder += '</section>';
}
}); //each
$('#BooksContent').html(htmlBuilder).
find('img, button').click(function (evt) {
$(this).css('border', '1px solid red')
});
$('#BooksContent').css('background-color', 'black');
$('button').button();
}); //getPulitzers
$largest = 0;
$(".wrapper").each(function () {
if ($(this).height() > $largest) {
$largest = $(this).height();
}
});
$(".wrapper").css("height", $largest);
// This is not working; axed a question on the jQuery forum
$('img, button').click(function (evt) {
$(this).css('border', '5px solid green');
evt.preventDefault();
});
// added this 7/24/2013 - does nothing
//$(function () {
// $('a').click(function () {
// open(this.href, 'NewWin', 'toolbar=yes');
// self.focus();
// return false;
// });
//});
} // getPulitzers()
function getNatlBook() {
. . . } // getNatlBook()
function getNOBA() {
// load bookContents using getJSON
}
// MOVIES
// Movies differ from books and music in that some of the awards do not always have a person as winner - just the movie
// So we have to check for that and conditionally add that bit of html (what corresponds to author in books and
// artist in music)
function getMovies(pathToJsonFile) {
var htmlBuilder = '';
$.getJSON(pathToJsonFile, function (data) {
// I tried renaming the above to nbcc.json, but it won't work with that name...?!? $.getJSON('Content/nbcc.json', function (data) {
$.each(data, function (i, dataPoint) {
if (IsYear(dataPoint.category)) {
htmlBuilder += '<div class=\"yearBanner\">' + dataPoint.category + '</div>';
} else { // see snippet at top of unit for dealing with landscape-oriented books (such as some children's books) to change height and width of img
htmlBuilder += '<section class=\"wrapper\" ><a id=\"mainImage\" class=\"floatLeft\" href=\"' +
dataPoint.imghref + '\"' + ' target=\"_blank\"><img height=\"160\" width=\"107\" src=\"' +
dataPoint.imgsrc + '\"' +
dataPoint.imgalt + '></img></a>' +
'<div id=\"prizeCategory\" class=\"category\">' +
dataPoint.category +
'</div><br/><cite id=\"prizeTitle\" >' +
dataPoint.film +
'</cite><br/>';
if (dataPoint.person.trim().length > 2) {
htmlBuilder += '<div id=\"prizeArtist\" class=\"person\">' + dataPoint.person + '</div><br/>';
}
if (dataPoint.bluray.trim().length > 2) {
htmlBuilder += '<button><a href=\"' + Urlify(dataPoint.bluray) + '\"' +
' target=\"_blank\" >BluRay</a></button>';
}
if (dataPoint.dvd.trim().length > 2) {
htmlBuilder += '<button><a href=\"' + Urlify(dataPoint.dvd) + '\"' +
' target=\"_blank\" >DVD</a></button>';
}
htmlBuilder += '</section>';
}
}); //each
$('#MoviesContent').html(htmlBuilder).
find('img, button').click(function (evt) {
$(this).css('border', '1px solid silver')
});
$('#MoviesContent').css('background-color', 'black');
$('button').button();
//console.log(htmlBuilder); <-- may want this for response to click on tab when movie tab is selected
}); //getOscars
$largest = 0;
$(".wrapper").each(function () {
if ($(this).height() > $largest) {
$largest = $(this).height();
}
});
$(".wrapper").css("height", $largest);
}
// MUSIC
// "work" is used for "album or song or recording or performance"
//TODO: Make this a generic "Music" function a la Movies above
function getGrammies() {
var htmlBuilder = '';
$.getJSON('Content/grammies.json', function (data) {
$.each(data, function (i, dataPoint) {
if (IsYear(dataPoint.category)) {
htmlBuilder += '<div class=\"yearBanner\">' + dataPoint.category + '</div>';
} else { // see snippet at top of unit for dealing with landscape-oriented books (such as some children's books) to change height and width of img
htmlBuilder += '<section class=\"wrapper\" ><a id=\"mainImage\" class=\"floatLeft\" href=\"' +
dataPoint.imghref + '\"' + ' target=\"_blank\"><img height=\"160\" width=\"107\" src=\"' +
dataPoint.imgsrc + '\"' +
dataPoint.imgalt + '></img></a>' +
'<div id=\"prizeCategory\" class=\"category\">' +
dataPoint.category +
'</div><br/><cite id=\"prizeTitle\" >' +
dataPoint.work +
'</cite><br/><div id=\"prizeArtist\" class=\"work\">' +
dataPoint.artist +
'</div><br/>';
if (dataPoint.mp3.trim().length > 2) {
htmlBuilder += '<button><a href=\"' + Urlify(dataPoint.mp3) + '\"' +
' target=\"_blank\">mp3</a></button>';
}
if (dataPoint.dvd.trim().length > 2) {
htmlBuilder += '<button><a href=\"' + Urlify(dataPoint.dvd) + '\"' +
' target=\"_blank\">DVD</a></button>';
}
if (dataPoint.vinyl.trim().length > 2) {
htmlBuilder += '<button><a href=\"' + Urlify(dataPoint.vinyl) + '\"' +
' target=\"_blank\">Vinyl</a></button>';
}
htmlBuilder += '</section>';
//// Doesn't work
//$('img').error(function () {
// $(this).attr("src", "Content/NoImageAvailable.png");
//});
}
}); //each
$('#MusicContent').html(htmlBuilder).
find('img, button').click(function (evt) {
$(this).css('border', '1px solid gold')
});
$('#MusicContent').css('background-color', 'black');
$('button').button();
}); //getJSONMusic
$largest = 0;
$(".wrapper").each(function () {
if ($(this).height() > $largest) {
$largest = $(this).height();
}
});
$(".wrapper").css("height", $largest);
}
function configLoading() {
$('#lblLoading').show();
// TODO: Not working for some reason - the configLoaded never sets them back to enabled...
//$('bookDropDown').Attr('disabled', true);
//$('moviesDropDown').Attr('disabled', true);
//$('musicDropDown').Attr('disabled', true);
}
function configLoaded() {
$('#lblLoading').hide();
//$('bookDropDown').Attr('disabled', false);
//$('moviesDropDown').Attr('disabled', false);
//$('musicDropDown').Attr('disabled', false);
}
$(document).ready(function () {
$('#tabs').tabs({
beforeActivate: function (event, ui) {
// Pulitzers is loaded at first; any time the books tab is clicked, something will already be there
if (ui.newTab.index() == 1) {
moviesContent = $('#MoviesContent').html();
if (moviesContent == 'Content in Movies tab') {
// TODO: When it's ready, uncomment this: getOscars();
}
}
else if (ui.newTab.index() == 2) {
musicContent = $('#MusicContent').html();
if (musicContent == 'Content in Music tab') {
// TODO: When it's ready, uncomment this: getGrammies();
}
}
}
});
$('body').on('error', 'img', function (e) {
$(e.currentTarget).attr("src", "Content/NoImageAvailable.png");
});
// This makes the external hrefs / targets "pop up"; I don't think I want that...
//$('body').on('click', 'a', function () {
// open(this.href, 'NewWin', 'toolbar=yes')
// self.focus();
// return false;
//});
// Books tab is default view; load the default list (Pulitzer); the other two default lists (oscars and grammies)
// will load the first time the user selects the corresponding tab (see beforeActivate() above)
getPulitzers();
currentBookSelection = "Pulitzer";
configLoaded();
$('#bookDropDown').change(function () {
// TODO: May want to keep track of when in loading mode, and if so, exit/return
configLoading();
$('#body').removeClass('bronzeBackground silverBackground goldBackground').addClass('bronzeBackground');
var sel = this.value;
if ((sel == "NBCC") && (currentBookSelection != "NBCC")) {
getNatlBookCritics();
currentBookSelection = "NBCC";
}
else if ((sel == "NBA") && (currentBookSelection != "NBA")) {
getNatlBook();
currentBookSelection = "NBA";
}
else if ((sel == "NOBA") && (currentBookSelection != "NOBA")) {
getNOBA();
currentBookSelection = "NOBA";
}
else if ((sel == "Pulitzer") && (currentBookSelection != "Pulitzer")) {
getPulitzers();
currentBookSelection = "Pulitzer";
}
configLoaded();
}); //bookDropDown
$('#moviesDropDown').change(function () {
configLoading();
$('#body').removeClass('bronzeBackground silverBackground goldBackground').addClass('silverBackground');
var sel = this.value;
if ((sel == "Oscars") && (currentMovieSelection != "Oscars")) {
currentMovieSelection = "Oscars";
getMovies('Content/oscars.json');
}
else if ((sel == "GoldenGlobe") && (currentMovieSelection != "GoldenGlobe")) {
currentMovieSelection = "GoldenGlobe";
getMovies('Content/goldenglobe.json');
}
else if ((sel == "Cannes") && (currentMovieSelection != "Cannes")) {
currentMovieSelection = "Cannes";
getMovies('Content/cannes.json');
}
else if ((sel == "Sundance") && (currentMovieSelection != "Sundance")) {
currentMovieSelection = "Sundance";
getMovies('Content/sundance.json');
}
configLoaded();
}); //moviesDropDown
$('#musicDropDown').change(function () {
configLoading();
$('#body').removeClass('bronzeBackground silverBackground goldBackground').addClass('goldBackground');
var sel = this.value;
if ((sel == "Grammies") && (currentMusicSelection != "Grammies")) {
currentMusicSelection = "Grammies";
getGrammies();
}
else if ((sel == "AMA") && (currentMusicSelection != "AMA")) {
currentMusicSelection = "AMA";
getAMA();
}
else if ((sel == "CMA") && (currentMusicSelection != "CMA")) {
currentMusicSelection = "CMA";
getCMA();
}
else if ((sel == "Indies") && (currentMusicSelection != "Indies")) {
currentMusicSelection = "Indies";
getIndies();
}
configLoaded();
}); //musicDropDown
// added 7/24/2013, changed nothing
//$(function() {
// $('a').click(function() {
// open(this.href, 'NewWin', 'toolbar=yes');
// self.focus();
// return false;
// });
//});
}); //ready
</script>
UPDATE 8
barvaz's answer also does not work for me; maybe I'm doing it wrong? Based on his answer, this is what I added:
CSS
.noImg {
background:url(~/Content/NoImageAvailable.png);
}
jQuery
0) Added this within the ready handler:
replaceEmptyImage = function ($img) {
$img.parent().addClass('noImg');
$img.remove();
};
1) Changed this line:
dataPoint.imghref + '\"' + ' target=\"_blank\"><img height=\"160\" width=\"107\" src=\"' +
...to this:
dataPoint.imghref + '\"' + ' target=\"_blank\"><img height=\"160\" width=\"107\" onerror=\"replaceEmptyImage($(this))\" src=\"' +
UPDATE 9
Here's what it looks like (the image "block" or "object" is there, it's just that it's black/blank):
BTW, The Travels of Jamie McPheeters is an awesome book at any rate, but perhaps especially to read to your kids (any age, but perhaps pre-teen is optimal).
虽然你的解释不是很清楚,但最可能的原因是你的<img>标签在调用函数时不存在$('img').error();
尝试
1)使用一些id创建动态图像.
2)将img标记放入DOM后调用错误函数.
该<img>标签未与误差函数的约束,那就是我可以看到没有工作代码的唯一原因.现在的工作样本:
HTML:
<div id="myId">
h
</div>
jQuery脚本:
var jObject = $("<img src='helo.png' />");
$(jObject).error(function(){
$(this).attr("src", "http://rack.2.mshcdn.com/media/ZgkyMDEyLzEyLzAzL2U0L3NlZWhvd3lvdXJnLjlyMS5qcGcKcAl0aHVtYgk5NTB4NTM0IwplCWpwZw/8fec6ce4/e71/see-how-your-google-results-measure-up-with-google-grader-video--6b8bbb4b41.jpg");
});
$("#myId").html(jObject);
你可以在这里查看工作小提琴[http://jsfiddle.net/jyXqw/][1]
编辑*
var jObject = $(htmlBuilder);
jObject.find("img").error(function(){
$(this).attr("src", "Content/NoImageAvailable.png");
});
$('#BooksContent').append(jObject);
编辑-2 * 检查小提琴,你的代码似乎工作完美正常:http://jsfiddle.net/jYbQx/
使用图像加载插件
https://github.com/desandro/imagesloaded
利用 jQuery 延迟对象的强大功能。这甚至可以确定是否为您加载了图像，因此您不必使用 jQuery.error （TBH，这实际上并不是一个合适的用途）。
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