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JavaScript - Need Help With If And Else Conditions Please
I want to be able to load a different background image depending on the time of day.
I have the code below which does work for nanaimo-morning image if before 8 am and after 8 am it will load the nanaimo-daytime image. I have tried but I can't seem to add another condition where after 8 pm it will load another imaged called nanaimo-night.png Yes, I am rather new at this, any help is greatly appreciated <code> <!DOCTYPE HTML> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Untitled Document</title> <script language="JavaScript"> function determineBackground() { var currentTime = new Date(); if (currentTime.getHours() < 8) { document.body.background = 'images/nanaimo-morning.png'; } else { document.body.background = 'images/nanaimo-daytime.png'; } } </script> </head> <body onload="determineBackground()"> </body> </html> </code> Similar TutorialsFYI: THIS IS NOT HOMEWORK! Hi all, I am trying to make an all-in-one function that can use local storage and provide 4 functions: (1) read data (2) write data (3) erase specific data (4) erase all data Here's the code block I have (with alerts in place of the local storage code for debugging): Code: var storage = function (name, value) {
if (name) {
if (value === null) {
return alert('erase');
} else {
if (value != null) {
return alert('write');
} else {
return alert('read');
}
}
} else {
return alert('nuke');
}
};
I want to use it like this: storage(); - erases ('nukes') everything storage('abc'); - reads data stored as 'abc' storage('abc', 'newvalue'); - stores 'newvalue' as 'abc' storage('abc', null); - erases data stored as 'abc' only It seems to work, but I have a funny feeling about trusting the difference between "==" and "===" to make it work. Am I wrong? Is there a real difference between == and === and am I doing this correctly? Thanks! -- Roger Hiya, Not sure how to put this, here goes: I'm trying to create a form to receive customer complaints. I'm fine with the basic form structure, but would like a drop-down box or radio buttons allowing the user to state which country in the UK they are emailing from. The options are, England, Scotland, Wales and N Ireland. For example, a user fills a form in with their complaint, and selects Scotland from the drop-down/radio buttons. When the users clicks on the submit button, the script should then send an acknowledgement email to the user, and send the form details of the user to the Scottish email address of the organisation. Likewise for England, Wales and N Ireland. I'm looking at doing this all client-side. Any help would be gratefully appreciated. Many Thanks Snarf1974 Hi! I am trying to check and see if three fields are empty and if they are then to alert the user saying to fill in one of the three fields. I tried this: Code: if (StreetNumber.value.length == 0) {
if (StreetName.value.length == 0) {
if (City.value.length == 0) {
alert("Please enter a street number, street name, or city.");
StreetNumber.focus();
return false;
}
}
}
and this: Code: if (StreetNumber.value.length == 0 && StreetName.value.length == 0 && City.value.length == 0) {
alert("Please enter a street number, street name, or city.");
StreetNumber.focus();
return false;
}
Neither one works. Not sure what I am doing wrong. Thanks in advance! Hey all, Okay, Here is what i would like to do. I have a calculator he http://www.nico-online.co.uk/calculator/calc1.html which after some help from Dormilich - got working! Now, I would like to set up some conditions, so if the use selected 'Mountainbike' then, the script will perform a different calculation to if they select the 'Rennrad' option. Okay, so I was thinking an If..else..if..else statement would probably be best after reading up This is what I have come up with: Code:
<script language="JavaScript">
function Framesize()
{
var a = parseFloat(BikeSizer.Insleg.value);
if(BikeSizer.Biketype.value = "Mountainbike")
{
b = (a * 0.572);
c = Math.round(b);
BikeSizer.FramesizeCM.value = c;
d = (a * 0.226);
e = Math.round(d);
BikeSizer.FramesizeInch.value = e;
}
else if (BikeSizer.Biketype.value = "Trekking-, Reise- oder Cityrad")
{
b = (a * 5);
c = Math.round(b);
BikeSizer.FramesizeCM.value = c;
d = (a * 5);
e = Math.round(d);
BikeSizer.FramesizeInch.value = e;
}
else{
b = (a * 10);
c = Math.round(b);
BikeSizer.FramesizeCM.value = c;
d = (a * 10);
e = Math.round(d);
BikeSizer.FramesizeInch.value = e;
}
}
</script>
So, I'm not too sure if I can set the Menu values as recongnisable values! Here are the values I have: <select name="Biketype" style="font-size:11px;"> <option>Mountainbike</option> <option>Trekking-, Reise- oder Cityrad</option> <option>Rennrad</option> </select> Anyone out there offer any insight? Am I going horribly wrong somewhere? Apologies for the stupidness , I am quite new to JS! Thanks in advance Hi I have the following code. What I want to do is for certain questions to remain hidden inless certain conditions are met, then they appear to be answered. I am thinking with the <div> but not sure how. I also thought maybe with css but cant write a if statement in css so that a no go. Please help. Code: <tr><td align="left">Do you own a Yorkie?<br /> <input type="radio" name="owner" value="yes" /> Yes <input type="radio" name="owner" value="no" checked="checked" /> No<br /> <!-- If answer is no above the below questions are hidden, if yes then they appear -->> <div id="breeders"> How many? <select name="qnty" size="1"> <option value="1">1</option> <option value="2">2</option> <option value="3">3</option> <option value="4">4</option> <option value="5">5+</option></select> Are you a breeder? <input type="radio" name="breeder" value="yes" checked="checked" /> Yes <input type="radio" name="breeder" value="no" /> No</div></td></tr> JavaScript Code: I am using a onload within the form opening tag Code: function showDiv() {
if(document.forms[2].owner.value == "yes") {
document.getElementById('breeders').style.visibility = 'visible';
}
else
document.getElementById('breeders').style.visibility = 'hidden';
}
Never mind. I found a solution to get it working. I still don't know why it occurred, but I don't have the time to fulfill my curiosity like I could when I was a teenager. Hi I am trying to write a JavaScript conditional statement for 4 conditions I currently have: Code: var teamId=obj.id.substring(0, 1);
var indx=obj.id.substring(obj.id.indexOf('_')+1);
var id=indx.substring(0, indx.length-1);
var anotherTab = (indx.indexOf('a') >= 0) ? id + 'b' : id + 'a';
var anotherTab2 = (indx.indexOf('c') >= 0) ? id + 'b' : id + 'c';
var anotherTab3 = (indx.indexOf('d') >= 0) ? id + 'b' : id + 'd';
document.getElementById(teamId+'tab_' + indx).className = 'selected';
document.getElementById(teamId + 'tab_' + anotherTab).className = '';
document.getElementById(teamId + 'tab_' + anotherTab2).className = '';
document.getElementById(teamId + 'tab_' + anotherTab3).className = '';
if (indx==id+'a')
{
show (teamId+'basketballInfo_'+id);
hide(teamId + 'soccerInfo_' + id);
hide(teamId + 'footballInfo_' + id);
hide(teamId + 'baseballInfo_' + id);
}
else if(indx==id+'b')
{
hide(teamId + 'basketballInfo_' + id);
show(teamId + 'soccerInfo_' + id);
hide(teamId + 'footballInfo_' + id);
hide(teamId + 'baseballInfo_' + id);
}
else if(indx==id+'c')
{
hide(teamId + 'basketballInfo_' + id);
hide(teamId + 'soccerInfo_' + id);
hide(teamId + 'baseballInfo_' + id);
show(teamId + 'footballInfo_' + id);
}
else
{
hide(teamId + 'basketballInfo_' + id);
hide(teamId + 'soccerInfo_' + id);
hide(teamId + 'footballInfo_' + id);
show(teamId + 'baseballInfo_' + id);
}
}
I am trying to turn one tab on and have the others turned off until another tab is clicked on. It works fine if I have all 4 conditions but I need to be able to also have 3, 2, and 1. What would be an easy way to do so? |
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