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JavaScript - How To Improve This?
Well I made a calculator in JavaScript but I think it's kind of a dumb downed version. Ignore my html styling and tags I just threw it together quickly and wanted to avoid using a CSS. I am beginning Object Oriented Programming with JavaScript could anyone give an example of applying that on the calculator?
Quote: <html> <head> <script type="text/javascript"> function mult(){ var a = document.getElementById("yal").value; var b = document.getElementById("fal").value; var h=a*b; document.getElementById("mal").innerHTML=h; } function adder(){ var a = document.getElementById("dig").value; var b = document.getElementById("yig").value; var h= a*1+b*1; document.getElementById("tig").innerHTML=h; } function divid(){ var a = document.getElementById("hos").value; var b = document.getElementById("mos").value; var h= a*1/b*1; document.getElementById("tos").innerHTML=h; } function subt(){ var a = document.getElementById("mat").value; var b = document.getElementById("sat").value; var h= a*1-b*1; document.getElementById("cat").innerHTML=h; } </script> </head> <body> <div style="float:left;"> <h3>adding</h3> <input type="text" id="dig" > <br /> <input type="text" id="yig" > <br /> <input type="button" value="submit" onclick="adder()"> <p id="tig"></p> </div> <div style="float:left;"> <h3>multiplyer</h3> <input type="text" id="fal" > <br /> <input type="text" id="yal" > <br /> <input type="button" value="submit" onclick="mult()"> <p id="mal"></p> </div> <div style="float:left;"> <h3>divider</h3> <input type="text" id="hos" > <br /> <input type="text" id="mos" > <br /> <input type="button" value="submit" onclick="divid()"> <p id="tos"></p> </div> <div style="float:left;"> <h3>subtractor</h3> <input type="text" id="mat" > <br /> <input type="text" id="sat" > <br /> <input type="button" value="submit" onclick="subt()"> <p id="cat"></p> </div> </body> </html> Similar Tutorialsfunction textSize(updown) { var size = Number(readCookie('user-font-size')); if (size == 0) { size = 12; // No Cookie, Set A Default Size Of 12px } size = size + Number(updown); // Adjust The Current Size if (size > 20) { size = 20; } // Stop At 13 if (size < 12) { size = 12; } // Stop At 10 writeCookie('user-font-size', size, 12); // Update The Cookie document.body.style.fontSize = size + 'px'; // Set The Users Text Size } function writeCookie(name, value, days) { if (days) { var date = new Date(); date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000)); var expires = '; expires=' + date.toGMTString(); } else { expires = ''; } document.cookie = name + '=' + value + expires; } function readCookie(name) { name += '='; var cs = document.cookie.split(';'); for (var i = 0; i < cs.length; i++) { var c = cs[i]; while (c.charAt(0) == ' ') { c = c.substring(1, c.length); } if (c.indexOf(name) == 0) { //-----------// return c.substring(name.length, c.length); // Gotcha // } //-----------// } //------------// return null; // Failed // } //------------ <img id="plustext" class="zoom-in" alt="Increase text size" src="Zoom-In-icon.png" onclick="textSize (2);" style="cursorointer" /> <img id="minustext" class="zoom-out" alt="Decrease text size" src="Zoom-Out-icon.png" onclick="textSize (-2);" style="cursorointer" /> <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer vel fringilla arcu. Cras ullamcorper nunc ac sapien gravida ultrices. Curabitur mollis consectetur elit non tempus. Duis blandit luctus feugiat. Nullam eget tellus at quam dapibus tempus in scelerisque ligula. Phasellus turpis ante, tincidunt at aliquam vel, luctus vitae leo. Suspendisse dignissim vehicula est, ac dapibus justo pellentesque eu. </p> cheers hope thats enough code Ant. Hello, I was wondering if there was a way to make the code below more efficient. Code: var foo = process(bar);
if( foo === false ) {
alert('a problem occured');
}
In PHP you would do something like: PHP Code: if(!$foo = process($bar)) { echo('a problem occured'); } I have a Javascript Dropdown Menu ( Code Below ), which is working nicely, but I want to improve it, but need help to so so. When you hover over one of the dropdown's, it shows links to a page, I would like those links to also show more to the right... For example; 1). Hover over 'Community', which shows the list of links below. 2). Hover over 'Connect With Us', will show another list to the right with links such as; 'Facebook', 'YouTube'...... The HTML Code; Code: <body>
<div class="chromestyle" id="chromemenu">
<ul>
<li><a href="#">Home</a></li>
<li><a href="#" rel="dropmenu1">Dropdown One</a></li>
<li><a href="#" rel="dropmenu2">Dropdown 2s</a></li>
<li><a href="#" rel="dropmenu3">Dropdown 3</a></li>
</ul>
</div>
<!--1st drop down menu -->
<div id="dropmenu1" class="dropmenudiv">
<a href="#">Link One</a>
<a href="#">Link Two</a>
<a href="#">Link Three</a>
<a href="#">Link Four</a>
</div>
<!--2nd drop down menu -->
<div id="dropmenu2" class="dropmenudiv" style="width: 150px;">
<a href="#">Link One</a>
<a href="#">Limk Two</a>
<a href="#">Link Three</a>
</div>
<!--3rd drop down menu -->
<div id="dropmenu3" class="dropmenudiv" style="width: 150px;">
<a href="#">Link One</a>
<a href="#">Link Two</a>
<a href="#">Link Three</a>
</div>
<script type="text/javascript">
cssdropdown.startchrome("chromemenu")
</script>
</body>
The CSS Code; Code: .chromestyle{
width: 1020px;
font-weight: bold;
}
.chromestyle:after{ /*Add margin between menu and rest of content in Firefox*/
content: ".";
display: block;
height: 0;
clear: both;
visibility: hidden;
}
.chromestyle ul{
border: 1px solid #BBB;
width: 100%;
background: url(chromebg4.gif) center center repeat-x; /*THEME CHANGE HERE*/
padding: 4px 0;
margin: 0;
text-align: left; /*set value to "left", "center", or "right"*/
}
.chromestyle ul li{
display: inline;
}
.chromestyle ul li a{
color: #494949;
padding: 4px 7px;
margin: 0;
text-decoration: none;
border-right: 1px solid #E8BEBE; /*THEME CHANGE HERE*/
}
.chromestyle ul li a:hover, .chromestyle ul li a.selected{ /*script dynamically adds a class of "selected" to the current active menu item*/
background: url(chromebg4-over.gif) center center repeat-x; /*THEME CHANGE HERE*/
}
/* ######### Style for Drop Down Menu ######### */
.dropmenudiv{
position:absolute;
top: 0;
border: 1px solid #E8BEBE; /*THEME CHANGE HERE*/
border-bottom-width: 0;
font:normal 12px Verdana;
line-height:18px;
z-index:100;
background-color: white;
width: 200px;
visibility: hidden;
}
.dropmenudiv a{
width: 100%;
display: block;
text-indent: 3px;
border: 1px solid #E8BEBE; /*THEME CHANGE HERE*/
padding: 2px 0;
text-decoration: none;
font-weight: bold;
color: black;
}
.dropmenudiv a:hover{ /*THEME CHANGE HERE*/
background-color: #FFECEC;
}
The Javascript Code; Code: var cssdropdown={
disappeardelay: 250, //set delay in miliseconds before menu disappears onmouseout
dropdownindicator: '<img src="down.gif" border="0" />', //specify full HTML to add to end of each menu item with a drop down menu
enablereveal: [true, 5], //enable swipe effect? [true/false, steps (Number of animation steps. Integer between 1-20. Smaller=faster)]
enableiframeshim: 1, //enable "iframe shim" in IE5.5 to IE7? (1=yes, 0=no)
dropmenuobj: null, asscmenuitem: null, domsupport: document.all || document.getElementById, standardbody: null, iframeshimadded: false, revealtimers: {},
getposOffset:function(what, offsettype){
var totaloffset=(offsettype=="left")? what.offsetLeft : what.offsetTop;
var parentEl=what.offsetParent;
while (parentEl!=null){
totaloffset=(offsettype=="left")? totaloffset+parentEl.offsetLeft : totaloffset+parentEl.offsetTop;
parentEl=parentEl.offsetParent;
}
return totaloffset;
},
css:function(el, targetclass, action){
var needle=new RegExp("(^|\\s+)"+targetclass+"($|\\s+)", "ig")
if (action=="check")
return needle.test(el.className)
else if (action=="remove")
el.className=el.className.replace(needle, "")
else if (action=="add" && !needle.test(el.className))
el.className+=" "+targetclass
},
showmenu:function(dropmenu, e){
if (this.enablereveal[0]){
if (!dropmenu._trueheight || dropmenu._trueheight<10)
dropmenu._trueheight=dropmenu.offsetHeight
clearTimeout(this.revealtimers[dropmenu.id])
dropmenu.style.height=dropmenu._curheight=0
dropmenu.style.overflow="hidden"
dropmenu.style.visibility="visible"
this.revealtimers[dropmenu.id]=setInterval(function(){cssdropdown.revealmenu(dropmenu)}, 10)
}
else{
dropmenu.style.visibility="visible"
}
this.css(this.asscmenuitem, "selected", "add")
},
revealmenu:function(dropmenu, dir){
var curH=dropmenu._curheight, maxH=dropmenu._trueheight, steps=this.enablereveal[1]
if (curH<maxH){
var newH=Math.min(curH, maxH)
dropmenu.style.height=newH+"px"
dropmenu._curheight= newH + Math.round((maxH-newH)/steps) + 1
}
else{ //if done revealing menu
dropmenu.style.height="auto"
dropmenu.style.overflow="hidden"
clearInterval(this.revealtimers[dropmenu.id])
}
},
clearbrowseredge:function(obj, whichedge){
var edgeoffset=0
if (whichedge=="rightedge"){
var windowedge=document.all && !window.opera? this.standardbody.scrollLeft+this.standardbody.clientWidth-15 : window.pageXOffset+window.innerWidth-15
var dropmenuW=this.dropmenuobj.offsetWidth
if (windowedge-this.dropmenuobj.x < dropmenuW) //move menu to the left?
edgeoffset=dropmenuW-obj.offsetWidth
}
else{
var topedge=document.all && !window.opera? this.standardbody.scrollTop : window.pageYOffset
var windowedge=document.all && !window.opera? this.standardbody.scrollTop+this.standardbody.clientHeight-15 : window.pageYOffset+window.innerHeight-18
var dropmenuH=this.dropmenuobj._trueheight
if (windowedge-this.dropmenuobj.y < dropmenuH){ //move up?
edgeoffset=dropmenuH+obj.offsetHeight
if ((this.dropmenuobj.y-topedge)<dropmenuH) //up no good either?
edgeoffset=this.dropmenuobj.y+obj.offsetHeight-topedge
}
}
return edgeoffset
},
dropit:function(obj, e, dropmenuID){
if (this.dropmenuobj!=null) //hide previous menu
this.hidemenu() //hide menu
this.clearhidemenu()
this.dropmenuobj=document.getElementById(dropmenuID) //reference drop down menu
this.asscmenuitem=obj //reference associated menu item
this.showmenu(this.dropmenuobj, e)
this.dropmenuobj.x=this.getposOffset(obj, "left")
this.dropmenuobj.y=this.getposOffset(obj, "top")
this.dropmenuobj.style.left=this.dropmenuobj.x-this.clearbrowseredge(obj, "rightedge")+"px"
this.dropmenuobj.style.top=this.dropmenuobj.y-this.clearbrowseredge(obj, "bottomedge")+obj.offsetHeight+1+"px"
this.positionshim() //call iframe shim function
},
positionshim:function(){ //display iframe shim function
if (this.iframeshimadded){
if (this.dropmenuobj.style.visibility=="visible"){
this.shimobject.style.width=this.dropmenuobj.offsetWidth+"px"
this.shimobject.style.height=this.dropmenuobj._trueheight+"px"
this.shimobject.style.left=parseInt(this.dropmenuobj.style.left)+"px"
this.shimobject.style.top=parseInt(this.dropmenuobj.style.top)+"px"
this.shimobject.style.display="block"
}
}
},
hideshim:function(){
if (this.iframeshimadded)
this.shimobject.style.display='none'
},
isContained:function(m, e){
var e=window.event || e
var c=e.relatedTarget || ((e.type=="mouseover")? e.fromElement : e.toElement)
while (c && c!=m)try {c=c.parentNode} catch(e){c=m}
if (c==m)
return true
else
return false
},
dynamichide:function(m, e){
if (!this.isContained(m, e)){
this.delayhidemenu()
}
},
delayhidemenu:function(){
this.delayhide=setTimeout("cssdropdown.hidemenu()", this.disappeardelay) //hide menu
},
hidemenu:function(){
this.css(this.asscmenuitem, "selected", "remove")
this.dropmenuobj.style.visibility='hidden'
this.dropmenuobj.style.left=this.dropmenuobj.style.top="-1000px"
this.hideshim()
},
clearhidemenu:function(){
if (this.delayhide!="undefined")
clearTimeout(this.delayhide)
},
addEvent:function(target, functionref, tasktype){
if (target.addEventListener)
target.addEventListener(tasktype, functionref, false);
else if (target.attachEvent)
target.attachEvent('on'+tasktype, function(){return functionref.call(target, window.event)});
},
startchrome:function(){
if (!this.domsupport)
return
this.standardbody=(document.compatMode=="CSS1Compat")? document.documentElement : document.body
for (var ids=0; ids<arguments.length; ids++){
var menuitems=document.getElementById(arguments[ids]).getElementsByTagName("a")
for (var i=0; i<menuitems.length; i++){
if (menuitems[i].getAttribute("rel")){
var relvalue=menuitems[i].getAttribute("rel")
var asscdropdownmenu=document.getElementById(relvalue)
this.addEvent(asscdropdownmenu, function(){cssdropdown.clearhidemenu()}, "mouseover")
this.addEvent(asscdropdownmenu, function(e){cssdropdown.dynamichide(this, e)}, "mouseout")
this.addEvent(asscdropdownmenu, function(){cssdropdown.delayhidemenu()}, "click")
try{
menuitems[i].innerHTML=menuitems[i].innerHTML+" "+this.dropdownindicator
}catch(e){}
this.addEvent(menuitems[i], function(e){ //show drop down menu when main menu items are mouse over-ed
if (!cssdropdown.isContained(this, e)){
var evtobj=window.event || e
cssdropdown.dropit(this, evtobj, this.getAttribute("rel"))
}
}, "mouseover")
this.addEvent(menuitems[i], function(e){cssdropdown.dynamichide(this, e)}, "mouseout") //hide drop down menu when main menu items are mouse out
this.addEvent(menuitems[i], function(){cssdropdown.delayhidemenu()}, "click") //hide drop down menu when main menu items are clicked on
}
} //end inner for
} //end outer for
if (this.enableiframeshim && document.all && !window.XDomainRequest && !this.iframeshimadded){ //enable iframe shim in IE5.5 thru IE7?
document.write('<IFRAME id="iframeshim" src="about:blank" frameBorder="0" scrolling="no" style="left:0; top:0; position:absolute; display:none;z-index:90; background: transparent;"></IFRAME>')
this.shimobject=document.getElementById("iframeshim") //reference iframe object
this.shimobject.style.filter='progid:DXImageTransform.Microsoft.Alpha(style=0,opacity=0)'
this.iframeshimadded=true
}
} //end startchrome
}
Thank you in advance, Tim I am try to reduce the time taken to download my home page. I purchased a template and then just modified what I wanted. There is a script that calls 21 other scripts. I am told if I combined all this scripts into one or two scripts, my download time would go down. Help appreciated. Drachsi www.drachsi.com |
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