javascript 12 useful function
29 Sep 2018My javascript learn through practice!
some useful function
/*
* ZOOM PICTURE;
function zooom(){
o=window.event.srcElement;
o.z = o.z ? o.z : 10;
event.wheelDelta>=100 ? o.z++ : o.z --;
if(o.z > 20)o.z = 20;
if(o.z < 1)o.z = 1;
o.style.zoom = o.z + '0%';
return false;
}
document.getElementsByClassName = function(className) {
var children = document.getElementsByTagName('*') || document.all;
var elements = [];
for (var i = 0; i < children.length; i++) {
var child = children[i];
var classNames = child.className.split(' ');
for (var j = 0; j < classNames.length; j++) {
if (classNames[j] == className) {
elements.push(child);
break;
}
}
}
return elements;
}
printView = function(){
var nodes = document.getElementsByClassName("noprint");
for(var x in nodes){
sh(nodes[x]);
}
if(window.event.srcElement){
window.event.srcElement.src = nodes[x].style.display=="" ? "res/printer.gif" : "res/printer2.gif";
}
}
*/
function sh(e){
e.style.display = (e.style.display=="") ? "none" : "";
}
// get real position of elm
function realpos(elm) {
if(is_ie){
return elm.getBoundingClientRect();
}
var pos = {left:elm.offsetLeft,top:elm.offsetTop};
while((elm = elm.offsetParent) !== null) {
pos.left += elm.offsetLeft;
pos.top += elm.offsetTop;
}
return pos;
}
// preload images.
function preloadImages(){
if(!document.PIMAGES){
document.PIMAGES = [];
n = arguments.length-1;
for(var i=0;i<=n;i++){
document.PIMAGES[i] = new Image();
document.PIMAGES[i].src = arguments[i];
}
}
}
////
//function jump2(_url){
// setTimeout("window.location.href = '"+_url+"';",3000);
//}
/**
* visibility function
*/
function tog(){
display = arguments[0];
for( var i=1; i<arguments.length; i++ ) {
var x = $(arguments[i]);
if (x.style.display == "none" || x.style.display === ""){
x.style.display = display;
}else{
x.style.display = "none";
}
}
var e = is_ie ? window.event : this;
if (e) {
if (is_ie) {
e.cancelBubble = true;
e.returnValue = false;
}
return false;
}
}
/*
function tog2(){
$(arguments[0]).style.visibility = arguments[1];
if(arguments[1]=="hidden") $(arguments[0]).style.display = "none";
else $(arguments[0]).style.display = "block";
}*/
// get block visible from cookie
function gcv(){
for( var i=0; i<arguments.length; i++ ) {
v = cookie.get(arguments[i] + "_v");
$(arguments[i]).style.display = (v===null) ? 'block' : v;
}
}
// save block visible to cookie
function scv(){
for( var i=0; i<arguments.length; i++ ){
cookie.set(arguments[i] + "_v",$(arguments[i]).style.display);
}
}
//
var tags=[];
function dsp(o){
e = is_ie ? window.event : this;
o = o ? o : e.srcElement; // e.target ?? IE?
var d = $("flt_" + o.id);
if(d === null){
isp = function(){
d = document.createElement('DIV');
d.style.cssText = "position: absolute;border: " + DARK_COLOR + " 1px solid;padding:1px;";
p = realpos(o);
d.style.top = p.top + o.offsetHeight;
d.style.left = p.left;
d.id = 'flt_' + o.id;
document.getElementsByTagName("body")[0].appendChild(d);
};
csp = function(){
d.style.visibility = "hidden";
d.innerHTML = "";
};
asp = function(w){
d.innerHTML += "<div style=\"cursor:pointer\" class=\"lightBlock2\" onclick=\"$('"+o.id+"').value = this.innerHTML;csp();\">"+ w + "</div>";
d.style.visibility = "";
};
isp();
}
csp();
v = o.value.substr(o.value.lastIndexOf(',')+1);
l = v.length;
if(l === 0){
return;
}
if(e.keyCode != 13 && e.keyCode !=9 ){
for(var x in tags){
if(tags[x].substr(0,l) == v){
asp(tags[x]);
}
}
}
}
// no useful at all.
toglinks = function(){
for(x in document.links){
document.links[x].disabled = arguments[0];
}
}
/*
function clearTbody(tbody){
for(var i=tbody.rows.length;i>0;i--){
tbody.deleteRow(i-1);
}
}*/
// Expand links for printing
/*
String.prototype.hasClass = function(classWanted)
{
var classArr = this.split(/\s/);
for (var i=0; i<classArr.length; i++)
if (classArr[i].toLowerCase() == classWanted.toLowerCase()) return true;
return false;
}
var expandedURLs;
onbeforeprint = function() {
expandedURLs = [];
var contentEl = $("rn");
if (contentEl)
{
var allLinks = contentEl.getElementsByTagName("a");
for (var i=0; i < allLinks.length; i++) {
if (allLinks[i].className.hasClass("external") && !allLinks[i].className.hasClass("free")) {
var expandedLink = document.createElement("span");
var expandedText = document.createTextNode(" (" + allLinks[i].href + ")");
expandedLink.appendChild(expandedText);
allLinks[i].parentNode.insertBefore(expandedLink, allLinks[i].nextSibling);
expandedURLs[i] = expandedLink;
}
}
}
}
onafterprint = function()
{
for (var i=0; i < expandedURLs.length; i++)
if (expandedURLs[i])
expandedURLs[i].removeNode(true);
}
*/
/*
* FIX IE PNG
*/
if(is_ie){
addEvent(window,'load', function(){
for(var i=0; i<document.images.length; i++){
var img = document.images[i];
var lw=img.width;
var lh=img.height;
var imgName = img.src.toUpperCase();
if (imgName.substring(imgName.length-3, imgName.length) == "PNG"){
img.style.filter+="progid:DXImageTransform.Microsoft.AlphaImageLoader(src="+img.src+", sizingmethod=scale);";
img.src= "res/dot.gif";
img.width=lw;
img.height=lh;
}
}
});
}