converting variables

[php_novice2007]

hi,

 

I've got the following

 

<input type=checkbox name="u0001" unchecked>u0001<br>

<input type=checkbox name="u0002" unchecked>u0002<br>

<input type=checkbox name="u0003" unchecked>u0003<br>

<input type=checkbox name="u0004" unchecked>u0004<br>

 

and I want to use javascript to go through all the check boxes and see which one is checked. The check box names are stored in an array called unitArray. unitArray[0] = "u0001", unitArray[1] = "u0002" etc.

 

In my code I've got

 

for (var i = 0; i < unitArray.length; i++) {
  var t = "myform." + unitArray[i] + ".checked"; 
  if (t) {

  }
}

 

But this does not work. It says that myform.unitArray has no properties. Seems like the if statement just sees a string and say it is true because it is non empty.

 

How do I do what I want..?

 

Thanks~!

[mainewoods]

var t, ua;
for (var i = 0; i < unitArray.length; i++) {
    ua = unitArray[i]; //not sure if this intermediate step is necessary!
    t = document.myform[ua].checked; //uses dom [] array notation access
    if (t) {

    }
}

[php_novice2007]

Hi,

Thanks for that, that part works now.

Now I have a series of radio buttons

[code]
<input type=radio name="u0001choice" checked value="u0001 yes">yes
<input type=radio name="u0001choice" value="u0001 no">no
<input type=radio name="u0002choice" checked value="u0002 yes">yes
<input type=radio name="u0002choice" value="u0002 no">no
<input type=radio name="u0003choice" checked value="u0003 yes">yes
<input type=radio name="u0003choice" value="u0003 no">no
<input type=radio name="u0004choice" checked value="u0004 yes">yes
<input type=radio name="u0004choice" value="u0004 no">no 

               

 

And I want to go through the list of unitArray again and see which button is selected..

 

I tried

 

for (var i = 0; i < unitArray.length; i++) {
  var t2 = unitArray[i] + "choice"; 
  var t3 = document.myform[t2][1].checked;
  var t4 = document.myform[t2][1].value;              
  if (t3) {
    alert("For" + unitArray[i] + " " + t4 + " is chosen");
  }
}

 

But nothing is being alerted                

                }

[/code]

[mainewoods]

-do not use 'var' inside a loop, use 'var' before the loop

-your extra '[1]' was not valid

var t2, t3, t4;
for (var i = 0; i < unitArray.length; i++) {
    t2 = unitArray[i] + "choice"; 
    t4 = document.myform[t2].value;
    // it should alert a value like 'u0001 yes' or 'u0001 no'  but not both            
   alert("For " + t2 + " " + t4 + " is chosen");
}