How to get Image width and height from Multiples Files input?

How to get Image width and height from Multiples Files input? - javascript

I want to get each of images width and height from multiple input files in Javascript or JQuery. I search in google and tried many ways, but I can't found the way to do it.
Here is my code:
<input id="uploadBtn" type="file" class="upload" multiple="multiple" name="browsefile" style="display: none !important;" />
<input type="button" class="btn submit-btn" value="ファイル追加" onclick="document.getElementById('uploadBtn').click();" style="float: right;"/>
<input id="filename" type="hidden" />
Here is my Javascript:
<script>
document.getElementById("uploadBtn").onchange = function() {
document.getElementById("uploadFile").value = this.value;
};
document.getElementById('uploadBtn').onchange = uploadOnChange;
function uploadOnChange() {
var filename = this.value;
var lastIndex = filename.lastIndexOf("\\");
if (lastIndex >= 0) {
filename = filename.substring(lastIndex + 1);
}
var files = $('#uploadBtn')[0].files;
for (var i = 0; i < files.length; i++) {
(function(i) {
var extension = filename.split('.').pop();
if (extension == 'pdf')
{
$("#upload_prev").append('<div><span><br><div class="col-md-10"><span class="uploadFiles">' + '' + files[i].name + '' + '</span><br><label class="filelink"></label></div><div class="col-md-2"><p class="close" style="font-size: 13pt;">削除</p><br></div></span></div>');
}
else if (extension == 'jpg' || extension == 'jpeg' || extension == 'png' || extension == 'gif')
{
$("#upload_prev").append('<div><span><br><div class="col-md-10"><span class="uploadFiles">' + '' + files[i].name + '' + '</span><br><label class="filelink"></label></div><div class="col-md-2"><p class="close" style="font-size: 13pt;">削除</p><br></div></span></div>');
}
else
{
$("#upload_prev").append('<div><span><br><div class="col-md-10"><span class="uploadFiles">' + files[i].name + '</a>' + '</span><br><label class="filelink"></label></div><div class="col-md-2"><p class="close" style="font-size: 13pt;">削除</p><br></div></span></div>');
}
$("#upload_prev a:contains(" + files[i].name + ")")
.on("click", function(e) {
e.preventDefault();
var extension = filename.split('.').pop();
if (!/(pdf)$/ig.test(extension))
{
$('#imgPreview').modal('show');
$("#imgPreviewLabel").text(files[i].name)
var close = $('#imgPreview').closest("div")
.find(".filelink");
close.append(
$('<img>', {
src: URL.createObjectURL(files[i])
}).width('100%').height('100%')
)
}
else if (extension == 'pdf')
{
$('#pdfPreview').modal('show');
$("#pdfPreviewLabel").text(files[i].name)
var close = $('#pdfPreview').closest("div")
.find(".filelink");
close.append(
$('<iframe>', {
src: URL.createObjectURL(files[i])
}).width('565px').height('400px')
)
}
})
$(".modal_close").on("click", function(e){
$("#filelink img").remove();
$("#filelink iframe").remove();
})
$('#imgPreview').on('hidden.bs.modal', function () {
$("#filelink img").remove();
$("#filelink iframe").remove();
})
$('#pdfPreview').on('hidden.bs.modal', function () {
$("#filelink img").remove();
$("#filelink iframe").remove();
})
})(i);
}
document.getElementById('filename').value = filename;
}

You can try to get image width and height for multiple uploaded image files with this:
var _URL = window.URL || window.webkitURL;
$("#uploadBtn").change(function(e) {
var file, img;
for(var i=0; i<this.files.length; i++){
if ((file = this.files[i])) {
img = new Image();
img.onload = function() {
alert("width:"+this.width + " " + "height:" + this.height);
};
img.onerror = function() {
alert( "not a valid file: " + file.type);
};
img.src = _URL.createObjectURL(file);
}
}
});

Related

Javascript: How I make fileupload (not only image)?

I made a file uploader that handles images, but it doesn't work well with files.
For example: if I upload 3 xlsx/word or any files, these will have the same name for each.
My code is here:
<form>
<input id="files" type="file" multiple="multiple">
<div id="result"></div>
</form>
function handleFileSelect(event) {
if (window.File && window.FileList && window.FileReader) {
var files = Array.from(event.target.files);
var output = document.getElementById("result");
output.innerHTML = '';
console.log(files);
for (var i = 0; i < files.length; i++) {
var file = files[i];
if(file.type.match('.php')){
alert('ERROR');
continue;
}
var picReader = new FileReader();
picReader.addEventListener("load", function (event) {
var picFile = event.target;
var div = document.createElement("div");
div.className = "col-6 col-sm-4 p-1";
if (file.type.match('image')) {
div.innerHTML = "<img src='" + picFile.result + "'" + "title='" + file.name + "'/>";
}else{
div.innerHTML = "<div class='upload-thumb'>" + file.name + "</div>";
}
output.insertBefore(div, null);
});
picReader.readAsDataURL(file);
}
} else {
console.log("Your browser does not support File API");
}
}
Link:
https://jsfiddle.net/laszlooo/7c1Lv5x2/
Thank You!

Problem you have is you have the infamous for loop bug. Where the reference to i updates as your loop executes. You can either use let instead of var or break out the part you read the file into a function so you do not have the issue.
function readFile(file, output) {
var picReader = new FileReader();
picReader.addEventListener("load", function(event) {
var picFile = event.target;
var div = document.createElement("div");
div.className = "col-6 col-sm-4 p-1";
if (file.type.match('image')) {
div.innerHTML = "<img src='" + picFile.result + "'" + "title='" + file.name + "'/>";
} else {
div.innerHTML = "<div class='upload-thumb'>" + file.name + "</div>";
}
output.insertBefore(div, null);
});
picReader.readAsDataURL(file);
}
function handleFileSelect(event) {
if (window.File && window.FileList && window.FileReader) {
var files = Array.from(event.target.files);
var output = document.getElementById("result");
output.innerHTML = '';
console.log(files);
for (var i = 0; i < files.length; i++) { // <-- where the problem begins
var file = files[i]; // <-- this is your problem with the reference
if (file.type.match('.php')) {
alert('ERROR');
continue;
}
readFile(file, output) // <-- using a function gets around the reference issue
}
} else {
console.log("Your browser does not support File API");
}
}
document.querySelector("input").addEventListener("change", handleFileSelect)
<form>
<input id="files" type="file" multiple="multiple">
<div id="result"></div>
</form>

Remove button is not working

I'm trying to add preview and delete option before uploading multiple images, this is what I found:
$(document).ready(function() {
if (window.File && window.FileList && window.FileReader) {
$("#files").on("change", function(e) {
var files = e.target.files,
filesLength = files.length;
for (var i = 0; i < filesLength; i++) {
var f = files[i]
var fileReader = new FileReader();
fileReader.onload = (function(e) {
var file = e.target;
$("<span class=\"pip\">" +
"<img class=\"imageThumb\" src=\"" + e.target.result + "\" title=\"" + file.name + "\"/>" +
"<br/><span class=\"remove\">Remove image</span>" +
"</span>").insertAfter("#files");
$(".remove").click(function(){
$(this).parent(".pip").remove();
});
});
fileReader.readAsDataURL(f);
}
});
} else {
alert("Your browser doesn't support to File API")
}
});
But while uploading all images are getting uploaded, how to resolve this? I'm using php.

Ok, i'm create example that solved your problem:
Your HTML
<form method="post" id="sendForm">
<input type="file" id="files" multiple>
<input type="submit">
</form>
Your JS
$(document).ready(function() {
if (window.File && window.FileList && window.FileReader) {
// Array which stores all selected images
var sendData = [];
$("#files").on("change", function(e) {
var files = e.target.files,
filesLength = files.length;
for (var i = 0; i < filesLength; i++) {
var f = files[i]
var fileReader = new FileReader();
fileReader.onload = (function(e) {
var file = e.target;
$("<span class=\"pip\">" +
"<img class=\"imageThumb\" src=\"" + e.target.result + "\" title=\"" + file.name + "\"/>" +
"<br/><span class=\"remove\">Remove image</span>" +
"</span>").insertAfter("#files");
// Add all images to array
sendData.push({file: file, url: e.target.result});
$(".remove").click(function() {
var self = $(this).parent().children();
sendData.map(function(value, currentIndex, data) {
// Remove only image which removed from preview
if (self[0].currentSrc === value.url) {
sendData.splice(currentIndex, 1);
}
});
$(this).parent().remove();
});
$("#sendForm").submit(function(e) {
// Finally post all data to your PHP url that
$.post("your/php/url", sendData);
});
});
fileReader.readAsDataURL(f);
}
});
} else {
alert("Your browser doesn't support to File API")
}
});

remove specific file form multiple file input

I implemented a following HTML <input> multiple Attribute
<input type="file" name="R" id="someattachId" multiple="multiple" style='display:none' />
I'm trying to remove specific item in it using following code
$('#someattachId')[0].files[fileId].remove();
but it can't remove it.

No, We can make it removable.
I implemented this and it works definitely.
First you need to initialize this variables
var newImageObj = [];
var ImageNo = 0;
Then write this code on file input's change
$("#exampleInputFileProduct").change(function () {
var fileUpload = document.getElementById("exampleInputFileProduct");
//$("#mainImages").html('');
//$("#subImages").html('');
if (typeof (FileReader) != "undefined") {
//Here Check File Extension
var regex = /^([a-zA-Z0-9\s_\\.\-:])+(.jpg|.jpeg|.gif|.png)$/;
for (var i = 0; i < fileUpload.files.length; i++) {
var j = 0;
var file = fileUpload.files[i];
var NewFile = fileUpload.files[i];
//Here Check File Size 1MB = 1000000 Bytes
if (file.size < 2048000) {
if (regex.test(file.name.toLowerCase())) {
var reader = new FileReader();
reader.onload = function (e) {
if ($("#mainImages").find(".item").attr("id") == "FirstSlider") {
$("#mainImages").html('');
$("#subImages").html('');
$("#subImages").append("<div class='item active'></div>");
}
if ($("#mainImages").find(".item").hasClass("active")) {
$("#mainImages").append("<div class='item " + ImageNo + "_CClass\'><i class='fa fa-times customIcon' onclick='RemoveImage(\"" + ImageNo + "_CClass\",\"" + fileUpload.files[j].name.toLowerCase() + "\")'></i><img class='CImage' src='" + e.target.result + "' alt='' /></div>");
} else {
$("#mainImages").append("<div class='item active " + ImageNo + "_CClass'><i class='fa fa-times customIcon' onclick='RemoveImage(\"" + ImageNo + "_CClass\",\"" + fileUpload.files[j].name.toLowerCase() + "\")'></i><img class='CImage' src='" + e.target.result + "' alt='' /></div>");
}
//if ($("#subImages").find(".item").length == 0) {
// $("#subImages").append("<div class='item active'></div>");
//} else {
if (($("#subImages").find(".item").find("div").length / 5) >= $("#subImages").find(".item").length) {
$("#subImages").append("<div class='item'></div>");
}
//}
var append = 0;
$.each($("#subImages").find(".item"), function (p, pelement) {
if (append == 0) {
if ($(pelement).find("div").length != 5) {
var newID = $(pelement).find("div").length;
newID = newID;
$(pelement).append("<div onclick='LoadImage(\"" + ImageNo + "_CClass\")' data-slide-to='" + newID + "' class='thumb " + ImageNo + "_CClass'> <img src='" + e.target.result + "' alt=''></div>");
append = append + 1;
}
}
})
j = j + 1;
ImageNo = ImageNo + 1;
}
newImageObj.push(file);
reader.readAsDataURL(file);
}
}
}
} else {
alert("This browser does not support HTML5 FileReader.");
}
});
Then at last this 2 functions will help to do the rest
function LoadImage(objclass) {
$("#mainImages").find(".item").removeClass("active");
$("#mainImages").find("." + objclass + "").addClass("active");
}
function RemoveImage(objclass, ImageName) {
$.each(newImageObj, function (e, element) {
if ($(this)[0].name.toLowerCase().trim() == ImageName.trim()) {
newImageObj.pop(this);
}
});
$("#mainImages").find("." + objclass + "").remove();
$("#subImages").find(".item").find("." + objclass + "").remove();
if ($("#mainImages").find(".item").length == 0) {
$("#mainImages").append("<div class='item active'><i class='fa fa-times customIcon'></i><img class='CImage' src='/Content/img/DefaultProduct.gif' alt='' /></div>");
$("#subImages").append("<div class='item active'><div data-target='#carousel' data-slide-to='0' class='thumb'> <img src='/Content/img/DefaultProduct.gif' alt=''></div></div></div>");
} else {
$("#mainImages").find(".item").removeClass("active");
$("#mainImages").find(".item:first-child").addClass("active");
$("#subImages").find(".item").removeClass("active");
$("#subImages").find(".item:first-child").addClass("active");
}
}
At last when you submit your form than take the files from the array

How do get the name and size OF image Javascript

How do get the name and size OF images? (Javascript) After stored in array Using FileReader object ?
In the example required size and the name of the image files only .
Thank you so much
$(document).ready(function() {
var storedFiles = [];
var srcc = "";
$('#file_input').on('change', function(e) {
storedFiles = [];
for (var i = 0; i < $(this).get(0).files.length; ++i) {
storedFiles.push($(this).get(0).files[i]);
}
});
function readFile(file, callback) {
var reader = new FileReader();
reader.onload = callback;
reader.readAsDataURL(file);
}
$(document).on('click', '#btn', function(e) {
$("#div_upload").empty();
var fLen = storedFiles.length;
$("#spaneaddfile").html(" count: " + storedFiles.length);
for (var i = 0; i < fLen; i++) {
var filnameonarry = storedFiles[i].name;
var filsizeonarry = Math.round((Math.abs(parseInt(storedFiles[i].size)) * 0.000000954) * 1000) / 1000;
filnameonarry = filnameonarry.toString().trim();
filnameonarry = filnameonarry.toLowerCase();
var chkename2 = parseInt(filnameonarry.length);
var chkename3 = parseInt(filnameonarry.length - 4);
var chkename4 = filnameonarry.substring(chkename3);
if (chkename4 == '.png' || chkename4 == '.gif' || chkename4 == '.jpg' || chkename4 == '.bmp' || chkename4 == 'jpeg') {
if (window.File && window.FileReader && window.FileList && window.Blob) {
readFile(storedFiles[i], function(e) {
var html = "<div><img class='selFile' src=\"" + e.target.result + "\" data-file='" + "name" + "' title='Click to remove'>" + "get name and size" + "<br clear=\"left\"/></div>";
$("#div_upload").append(html);
});
} else {
srcc = '../background_site/close.png';
handleFileSelect3(storedFiles[i], i);
}
} else if (chkename4 == '.zip') {
srcc = '../background_site/zip.png';
handleFileSelect3(storedFiles[i], i);
} else if (chkename4 == '.rar') {
srcc = '../background_site/rar.png';
handleFileSelect3(storedFiles[i], i);
} else if (chkename4 == '.pdf') {
srcc = '../background_site/pdf.png';
handleFileSelect3(storedFiles[i], i);
} else {
srcc = '../background_site/wring.png';
handleFileSelect3(storedFiles[i], i);
}
};
});
function handleFileSelect3(evt, nmber) {
var f = evt;
var i = nmber;
var filnameonarry2 = f.name;
var filsizeonarry2 = Math.round((Math.abs(parseInt(f.size)) * 0.000000954) * 1000) / 1000;
var html = "<div> <img class='selFile' id='img_" + i + "' src='" + srcc + "' alt=''> " + filnameonarry2 + " " + filsizeonarry2 + "<br clear=\"left\"/></div>";
$("#div_upload").append(html);
}
});
.selFile {
width: 200px;
height: 200px;
float: left;
margin-bottom: 10px;
}
<script src="http://ajax.googleapis.com/ajax/libs/jquery/2.0.3/jquery.min.js"></script>
<input id="btn" name="btn" type="button" value="get view">
<input type="file" id="file_input" name="files[]" multiple />
<div id="div_upload"></div>
<div id="spaneaddfile" class="foo"></div>

Remove video navigation flickering from video gallery

i just build a video gallery
Here is the link to the video gallery
http://www.braddockinfotech.com/demo/dvnonline/vod1/
Two issues : :
1) While navigating through the gallery using up and down arrow keys there is kind of video jump or flicker.how to remove that
2)Unequal extra spaces before and after the first and last video in gallery.
Here is the html code
<body onkeydown="HandleKeyDown(event);">
<table cellpadding="0px" cellspacing="0px" border="0px" class="sitewidth">
<tr>
<td align="left" valign="top" style="width:800px;">
<div id='divVideoPlayer'></div>
</td>
<td align="center" style="width:140px;">
<div id="divPlaylistContainer">
<div id="playlistNavPrev">
<a id="imgNavPrev" onclick="MoveToDirection('Up');"><span class="arrow"> </span>
</a>
</div>
<div id="divPlaylist">
<!--playlist-->
<div id="spanSlider" style='top:0px; position:relative;'>
<ul id="ulSlider">
<?php $index=1 ; $firstVideoUrl='' ; $firstImageUrl='' ; $videoDetails=G
etVideoDetails(); echo "<script> var siteUrl = '".$siteUrl.
"' </script>"; while ($row=m ysql_fetch_array($videoDetails)) { echo
"<script>video[".$index. "]='";echo $row[3]. "';</script>"; echo "<script>image[".$index.
"]='";echo $row[2]. "';</script>"; //echo "<script>title[".$index. "]='";echo
$row[1]. "';</script>"; echo "<script>title[".$index. "]='";echo str_replace(
"'", "\'",$row[1]). "';</script>"; // 0 - id , 1 - Title , 2- ImageUrl, 3
- VideoUrl //echo $row[0].$row[1].$row[2].$row[3]. "<br/>"; //echo
"<li id='liButton_".$index. "'><a onclick=\"ShowVideo( '".$index."');\
"><img id='ImageButton_".$index. "' title='".$row[1]. "' alt='".$row[1]. "' src=".$siteUrl.
"timthumb/timthumb.php?src=".$row[2]. "&h=54&w=109&zc=1&a=c></a></li>"; $index++;
} ?>
</ul>
</div>
</div>
<div id="playlistNavNxt">
<a id="imgNavNext" onclick="MoveToDirection('Down');"><span class="arrow"> </span>
</a>
</div>
</div>
</td>
</table>
</body>
Here is the javascript code..
var video = new Array();
var image = new Array();
var title = new Array();
var noOfImagesCanShow = 6;
var selected = 1;
var slideNo = 1;
String.prototype.trim = function () {
return this.replace(/^\s+|\s+$/g, "");
};
function SetPlayList() {
var listHtml = '';
var lastIndex = slideNo * noOfImagesCanShow;
var firstIndex = (slideNo * noOfImagesCanShow) - (noOfImagesCanShow - 1);
var rowNo = 1;
for (var i = firstIndex; i <= lastIndex; i++) {
if (firstIndex >= 1 && lastIndex < title.length) {
listHtml += "<li id='liButton_" + rowNo + "'><a onclick=\"ShowVideo('" + i + "');\"><img id='ImageButton_" + i + "' title=\"" + title[i] + "\" alt='" + title[i] + "' src=" + siteUrl + "timthumb/timthumb.php?src=" + image[(i)] + "&h=54&w=109&zc=1&a=c></a></li>";
rowNo++;
}
}
document.getElementById('ulSlider').innerHTML = listHtml;
document.getElementById('liButton_1').tabIndex = 2;
document.getElementById('liButton_1').focus();
}
function ShowVideo(videoIndex) {
var streamToBeUsed = "";
var provideType = "";
if (video[videoIndex].trim().substring(0, 7) == "http://") {
streamToBeUsed = '';
provideType = "http";
} else {
streamToBeUsed = "rtmp://cp87191.edgefcs.net/ondemand/";
provideType = "rtmp";
}
var autostart = "true";
if (jwplayer("divVideoPlayer") != null) {
jwplayer("divVideoPlayer").stop();
}
jwplayer("divVideoPlayer").setup({
file: streamToBeUsed + video[videoIndex].trim(),
image: image[videoIndex],
icons: "true",
autostart: autostart,
screencolor: "black",
'width': '800',
'height': '510',
streamer: streamToBeUsed,
provider: provideType,
events: {
onBeforePlay: function () {
document.getElementById('liButton_' + videoIndex).tabIndex = '2';
document.getElementById('liButton_' + videoIndex).focus();
}
}
});
// clearing all style
var totalImages = noOfImagesCanShow;
for (var i = 1; i <= totalImages; i++) {
var imageId = (((slideNo * noOfImagesCanShow) - (noOfImagesCanShow)) + i).toString();
if (document.getElementById('liButton_' + i) != null && document.getElementById('ImageButton_' + imageId) != null) {
document.getElementById('liButton_' + i).className = 'inactiveli';
document.getElementById('ImageButton_' + imageId).className = 'inactive';
}
}
document.getElementById('liButton_' + videoIndex).className = 'activeli';
document.getElementById('ImageButton_' + (((slideNo - 1) * noOfImagesCanShow) + parseInt(videoIndex)).toString()).className = 'active';
SetButtonStatus(((slideNo - 1) * noOfImagesCanShow) + parseInt(videoIndex));
document.getElementById('liButton_' + videoIndex).tabIndex = '2';
document.getElementById('liButton_' + videoIndex).focus();
document.getElementById('divVideoPlayer').tabIndex = '-1';
}
function SetButtonStatus(imageIndex) {
if (imageIndex <= noOfImagesCanShow) {
document.getElementById('imgNavPrev').className = 'disable_up';
document.getElementById('imgNavPrev').tabIndex = '-1';
document.getElementById('imgNavNext').tabIndex = '3';
} else {
document.getElementById('imgNavPrev').className = 'enable_up';
document.getElementById('imgNavPrev').tabIndex = '1';
}
if (imageIndex > (image.length - noOfImagesCanShow)) {
document.getElementById('imgNavNext').className = 'disable_down';
document.getElementById('imgNavNext').tabIndex = '-1';
document.getElementById('imgNavPrev').tabIndex = '1';
} else {
document.getElementById('imgNavNext').className = 'enable_down';
document.getElementById('imgNavNext').tabIndex = '3';
}
}
function MoveToDirection(direction) {
if (direction == 'Down') {
if (document.getElementById('imgNavNext').className != 'disable_down') {
slideNo++;
SetButtonStatus(slideNo * noOfImagesCanShow);
SetPlayList();
var topEle = document.getElementById('liButton_1');
var nextSelImgId = topEle.getElementsByTagName("img")[0].getAttribute("id");
document.getElementById(nextSelImgId).className = 'active';
}
} else if (direction == 'Up') {
if (document.getElementById('imgNavPrev').className != 'disable_up') {
slideNo--;
SetButtonStatus(slideNo * noOfImagesCanShow);
SetPlayList();
var topEle = document.getElementById('liButton_6');
var nextSelImgId = topEle.getElementsByTagName("img")[0].getAttribute("id");
document.getElementById(nextSelImgId).className = 'active';
console.log('Setting active element ' + nextSelImgId);
document.getElementById('liButton_6').focus();
console.log('active element ' + document.activeElement.id);
}
}
}
function HandleKeyDown(ev) {
if (document.activeElement != null) {
var element = document.activeElement;
if (ev.keyCode == 13) {
/*User Pressed Enter, Handle If required*/
if (element.id == "imgNavNext" && element.className != "disable_down") {
MoveToDirection('Down');
} else if (element.id == "imgNavPrev" && element.className != "disable_up") {
MoveToDirection('Up');
} else if (element.id.indexOf("liButton_") > -1) {
var nameSections = element.id.split('_');
ShowVideo(nameSections[1]);
}
} else if (ev.keyCode == 40) {
/*User Pressed Down*/
console.log('Pressed Down');
console.log('Element Id is ' + element.id);
if (element.id.indexOf("liButton_") > -1) {
console.log('Entered liButton_ Checking....');
var nameSections = element.id.split('_');
var imgName = element.getElementsByTagName("img")[0].getAttribute("id");
var imgSection = imgName.split('_');
var nextImgToFocus = (parseInt(imgSection[1])) + 1;
var nextIndexToFocus = (parseInt(nameSections[1])) + 1;
if (document.getElementById("liButton_" + nextIndexToFocus) != null) {
document.getElementById("liButton_" + nextIndexToFocus).tabIndex = element.tabIndex;
element.tabIndex = "-1";
document.getElementById("ImageButton_" + nextImgToFocus).className = 'active';
document.getElementById("ImageButton_" + (nextImgToFocus - 1)).className = 'inactive';
document.getElementById("liButton_" + nextIndexToFocus).focus();
} else //need to focus in navNext
{
if (document.getElementById('imgNavNext').className != 'disable_down') {
console.log("Enetred need to focus navNext");
var topEle = document.getElementById('liButton_6');
var nextSelImgId = topEle.getElementsByTagName("img")[0].getAttribute("id");
document.getElementById(nextSelImgId).className = 'inactive';
document.getElementById('imgNavNext').focus();
}
}
} else {
if (element.id.indexOf("imgNavPrev") > -1) {
document.getElementById("liButton_1").focus();
}
}
} else if (ev.keyCode == 38) {
/*User Pressed Up Up*/
if (element.id.indexOf("liButton_") > -1) {
console.log('Up pressed ' + element.id);
var nameSections = element.id.split('_');
var imgName = element.getElementsByTagName("img")[0].getAttribute("id");
var imgSection = imgName.split('_');
var nextImgToFocus = (parseInt(imgSection[1])) - 1;
var nextIndexToFocus = (parseInt(nameSections[1])) - 1;
if (document.getElementById("liButton_" + nextIndexToFocus) != null) {
document.getElementById("liButton_" + nextIndexToFocus).tabIndex = element.tabIndex;
element.tabIndex = "-1";
document.getElementById("ImageButton_" + nextImgToFocus).className = 'active';
document.getElementById("ImageButton_" + (nextImgToFocus + 1)).className = 'inactive';
document.getElementById("liButton_" + nextIndexToFocus).focus();
} else //need to focus in navPrev
{
if (document.getElementById('imgNavPrev').className != 'disable_up') {
var topEle = document.getElementById('liButton_1');
var nextSelImgId = topEle.getElementsByTagName("img")[0].getAttribute("id");
document.getElementById(nextSelImgId).className = 'inactive';
document.getElementById('imgNavPrev').focus();
}
}
} else /* To handle up button from imgNavNext */
{
if (element.id.indexOf("imgNavNext") > -1) {
document.getElementById("liButton_6").focus();
}
}
}
}
}

The reason, I believe, the images flicker is because they aren't loaded until the button is clicked.
for (var i = firstIndex; i <= lastIndex; i++) {
if (firstIndex >= 1 && lastIndex < title.length) {
listHtml += "<li id='liButton_" + rowNo + "'><a onclick=\"ShowVideo('" + i + "');\"><img id='ImageButton_" + i + "' title=\"" + title[i] + "\" alt='" + title[i] + "' src=" + siteUrl + "timthumb/timthumb.php?src=" + image[(i)] + "&h=54&w=109&zc=1&a=c></a></li>";
rowNo++;
}
}
When the view is scrolled up or down, the list regenerates, and the images are loaded.
You can prevent the flicker if you preload the images.
You can do this by preloading all of the images at once or by loading the images while showing a "loading (please wait) graphic." Please see this http://perishablepress.com/3-ways-preload-images-css-javascript-ajax/

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