<form name="form1">
a <input type=text size=4 value=12 name="a" > + <input type="radio" type=radio name="r1" value="+" onClick="a_plus_b(form1)"> - <input type="radio" type=radio name="r1" value="-" onClick="a_minus_b(form1)"> b <input type="number" size=4 value=3 name="b"> = c <input type "number" value=0 name="c" size=9 > </form> |
var rart=1;
function a_plus_b(f) { var a=f.a.value; var b=f.b.value; var c=eval(a)+eval(b) f.c.value = c /*a+b liefert eine string-concatenation*/ } function a_minus_b(f) {
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<form name="form2">
a <input type=text size=4 value=12 name="a" onBlur="rechnen(1)"> + <input type="radio" type=radio name="r" value="+" onClick="rart=1;a_plus_b(form2)"> - <input type="radio" type=radio name="r" value="-" onClick="rart=-1;a_minus_b(form2)"> b <input type="number" size=4 value=3 name="b" onBlur="rechnen(2)"> = c <input type "number" value=0 name="c" size=9 onBlur="rechnen(3)"> </form> |
function rechnen(n){
switch(n) { case 1: document.form2.c.value = eval(document.form2.a.value)+rart*eval(document.form2.b.value) break; case 2: document.form2.c.value = eval(document.form2.a.value)+rart*eval(document.form2.b.value) break; case 3: document.form2.b.value = rart*(eval(document.form2.c.value)-eval(document.form2.a.value)) break; }} |
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