problem with +

@struxoOct 10.2004

hi,this is my first time on this forum and i’m new with javascript.I have problem with this:
when i write 2+3 i get 23 instead 5.when i using *,/ or – everything working fine.only problem is with +.

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JavaScript

14 Comments(s) _↴

@FangOct 10.2004 — #The first alert shows numeric addition, the second string addition:

&lt;script type="text/javascript"&gt;
 &lt;!--
 var total=2+3;
 alert(total);
 total="2"+"3";
 alert(total);
 //--&gt;
 &lt;/script&gt;

@steelersfan88Oct 10.2004 — #[i]Originally posted by Fang [/i]

[B]The first alert shows numeric addition, the second string addition[/B][/QUOTE] (also called addition, and concatenation, respectively, for the record of Struxo)

@struxoauthorOct 10.2004 — #Thanx,i tried but nothing works.here is my code:

res1=(agor+afor)/amatch;

res2=(bgor+bfor)/bmatch;

res=(res1+res2)/2;

document.write(res);

@sciguyryanOct 10.2004 — #Try:

<i>
 </i>&lt;script type="text/javasacript"&gt;
 &lt;!--
 res1 = (eval(agor) + eval(afor)) / amatch);
 res2 = (eval(bgor) + eval(bfor)) / bmatch);
 res = (res1 + res2) / 2;
 //--&gt;
 &lt;/script&gt;

Looks like you were using strings not numeric values ?

RyanJ

@FangOct 10.2004 — #If variables are string you will not get the expected result.

Are any variables from an input element? These are always strings.

@steelersfan88Oct 10.2004 — #sciguyryan ... eval isn't needed here, and since it takes a lot of memory t do, you'd rather avoid it. You can convert to numbers by the [font=monospace]Number([i]string[/i])[/font] function.

You best option is to define the agor, afor, bgor, and bfor as:

var afor = new Number([i]f.afor.value[/i]);
 var agor = new Number([i]f.agor.value[/i]);
 var bfor = new Number([i]f.bfor.value[/i]);
 var bgor = new Number([i]f.bgor.value[/i]);

(The italicized probably need changing ...

@sciguyryanOct 10.2004 — #[i]Originally posted by Fang [/i]

[B]If variables are string you will not get the expected result.

Are any variables from an input element? These are always strings. [/B][/QUOTE]

Yes, thats the problem. It looks like they are all from either a prompt box or an input element.

RyanJ

@steelersfan88Oct 10.2004 — #Congrats on you passing 1000 btw, guess i'm a tad late, but oh well ?

it doesn't appear struxo is online anymore, so we won't know for a while, unless struxo is invisible ...

@sciguyryanOct 10.2004 — #[i]Originally posted by steelersfan88 [/i]

[B]Congrats on you passing 1000 btw, guess i'm a tad late, but oh well ?

it doesn't appear struxo is online anymore, so we won't know for a while, unless struxo is invisible ... [/B][/QUOTE]

Thanks and yup... I always thought that feature was reserved for Admins and Mods but I must be thinking of another forum system ?.

RyanJ

@steelersfan88Oct 10.2004 — #[i]Originally posted by sciguyryan [/i]

[B]Thanks and yup... I always thought that feature was reserved for Admins and Mods but I must be thinking of another forum system[/B][/QUOTE] I'm surprised how many people don't know about it. I was inspired by an antagonist who never appeared online.

... Numerous people don't know about the online list or forums group list, either

</off-topic-ness>

@struxoauthorOct 10.2004 — #hi,thanx for replays.here is the whole program.i hope you can see mistakes.in txt boxes i put nummbers.

<html>

<body bgcolor = gray>

<script type="text/javascript">

function overunder()

{

var ovun=document.calc.ou.value;

var amatch=document.calc.amatch.value;

var bmatch=document.calc.bmatch.value;

var agor=document.calc.agor.value;

var afor=document.calc.afor.value;

var bgor=document.calc.bgor.value;

var bfor=document.calc.bfor.value;

res1=(agor+afor)/amatch;

res2=(bgor+bfor)/bmatch;

res=(res1 + res2)/2;

if(res<ovun)

{

document.write("<b>UNDER</b>");

}

if(res>ovun)

{

document.write("<b>ÖVER</b>");

}

if(res==ovun)

{

document.write("<b>EXAKT</b>");

}

}

 </script>
   <form name="calc">
   O/U: <input type="text" name="ou" size="8">

<br /> <br/> <br /> <br/>Lag A<br />

Antal matcher: <input type="text" name="amatch" size="8">

<br />

Mål +/-: <input type="text" name="agor" size="8"><input type="text" name="afor" size="8">

<br /> <br/> <br /> <br/>Lag B<br />

Antal matcher: <input type="text" name="bmatch" size="8">

<br />

Mål +/-: <input type="text" name="bgor" size="8"><input type="text" name="bfor" size="8">

<br /> <br/> <br />

<input type=button value="Visa resultat"

onClick="overunder()">

 </form>
   </body>

</html>

@sciguyryanOct 10.2004 — #Try this:

<i>
 </i>&lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"&gt;
 &lt;html&gt;
 &lt;body bgcolor="gray"&gt;
 &lt;script type="text/javascript"&gt;
 function overunder(){
 var ovun = new Number(document.calc.ou.value);
 var amatch = new Number(document.calc.amatch.value);
 var bmatch = new Number(document.calc.bmatch.value);
 var agor = new Number(document.calc.agor.value);
 var afor = new Number(document.calc.afor.value);
 var bgor = new Number(document.calc.bgor.value);
 var bfor = new Number(document.calc.bfor.value);
 var res1 = ((agor + afor) / amatch);
 var res2 = ((bgor + bfor) / bmatch);
 var res = ((res1 + res2) / 2);
 if(res &lt; ovun){
 document.write("&lt;b&gt;UNDER&lt;/b&gt;");
 }
 if(res &gt; ovun){
 document.write("&lt;b&gt;ÖVER&lt;/b&gt;");
 }
 if(res == ovun){
 document.write("&lt;b&gt;EXAKT&lt;/b&gt;");
 }
 }
 //--&gt;
 &lt;/script&gt;
 &lt;form id="calc"&gt;
 O/U: &lt;input type="text" id="ou" size="8" /&gt;
 &lt;br /&gt; &lt;br/&gt;&lt;br /&gt;&lt;br/&gt;Lag A&lt;br /&gt;
 Antal matcher: &lt;input type="text" id="amatch" size="8" /&gt;
 &lt;br /&gt;
 Mål +/-: &lt;input type="text" id="agor" size="8" /&gt;&lt;input type="text" id="afor" size="8" /&gt;
 &lt;br /&gt;&lt;br/&gt;&lt;br /&gt;&lt;br/&gt;Lag B&lt;br /&gt;
 Antal matcher: &lt;input type="text" id="bmatch" size="8" /&gt;
 &lt;br /&gt;
 Mål +/-: &lt;input type="text" id="bgor" size="8" /&gt;&lt;input type="text" id="bfor" size="8" /&gt;
 &lt;br /&gt;&lt;br/&gt;&lt;br /&gt;
 &lt;input type="button" value="Visa resultat" onClick="overunder()" /&gt;
 &lt;/form&gt;
 &lt;/body&gt;
 &lt;/html&gt;

RyanJ

@struxoauthorOct 10.2004 — #thank you very much.works perfect

@sciguyryanOct 10.2004 — #No problem, Glad to help.

RyanJ

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