Hi all.

I have this simple form.

I need if checkbox C_1 is selected:

1) field name="n_1" is required and accept only numbers;
2) field name="n_2" is required and accept only numbers;

I need if checkbox C_2 is selected:

3) field name="n_3" is required and accept only numbers;
4) field name="n_4" is required and accept only numbers;

If checkbox not selected no required fields.

Can you help me?

you could (use two forms,) query the checkboxes with {checkbox_element}.checked and then select the forms/form elements to check for valid input.

regards

PS: you can omit the href attribute, if you style those anchors with css

mmm sorry but I dont understand....

what don't you understand? the checkbox thing? well every checkbox element has a property called 'checked'. you can test if this property is true or false and depending on that you can do the validation.

regards

No... I don't understand: "use two forms"....
one example please?

the two forms idea was only to point out that you need something to sort out which elements are checked with the first checkbox and which with the second. I've seen several possibilities
- group the elements by a class name (using later the getElementsByClassName() function)
- group the elements inside a wrapper element that is accessible via its id (this can be any, including form, div, span, table,...)
* if you use form as wrapper you have access through {form}.elements
* if you use generic elements you have access through {element}.childNodes
- assign an id to every input element and access them through a JS array that contains the appropriate ids

so, which one you choose depends on what you want to do with the form later and what you like best.

the two forms idea occurred to me because so it is possible to send only the required form.

regards

PS: as for the 'go' link
[HTML]// html
<span class="go" id="gocheck">Go!</span>

// css
.go {
text-decoration: underline;
color: _your_link_color_;
background-color: _your_link_background_color_;
}

.go:hover {
color: _your_link_color_on_hover_;
background-color: _your_link_background_color_on_hover_;
}

// javascript
var link = document.getElementById("gocheck");
link.addEventListener("click", Go, false); // standard
link.attachEvent("onclick", Go); // IE[/HTML]

One more thought. you could also use parseInt() or parseFloat() to check for a number.

regards

If I'm not mistaken, the requirement is that the two fields n_1/n_2 are mandatory if the first checkbox is checked and the other two if the 2nd one is checked which doesn't mean that they shouldn't be sent if they are filled. In other words, I don't think two forms would be a good idea, but, as I said, I may be mistaken.

yea, it all depends on how the form data shall be sent, but it was not specified in the original post, so this idea popped up in my mind.

sorry but I do not know this method....

The basic idea is that when C1 is checked put the validation for the corresponding fields:

Not working... no error but the form is validate until the checkbox no selected

This code looks as if only the selected checkbox is checked (and of cause the checkbox value is not a number). there's no correlation which elements are to be checked if any of the checkboxes is selected. (either you do a second for loop, or you use fixed values for the checkbox if-statement)

I'am confused...

Don't loop over the elements array. Use fixed names/ids. That will allow you to get the correct elements. You could use the elements array/object if you provide names or set IDs and use document.getElementById().

I have change method and function javascript and semplify the code... but if checkbox not selected alert is always KO!

:(

The problem is still the same. After finding a checkbox and seeing that it's checked, you're checking the value of the same checkbox element (line 20). Also remove the semi-colon from line 18.

Based on the HTML you posted earlier, I suggest you try something like the following:
No need for a for loop to loop over all the form elements.

I need to loop because number of fields ( checkbox and other fields ) is variable in the form... do you understand my?

Oh, I see. So then how would you determine which checkbox applies to which element?

this is the problem...

Let's try again. Is it always one checkbox followed by two text boxes?

this is why I thought about using several forms. Is it a good idea to use: (foreach) form.submit() to send all forms?

maybe you can add a class to every input group and access them through getElementsByClassName()...

regards

Yes the form is always this: one checkbox followed by two text boxes.

@ acoder: do you think node.nextSibling would be of use here?

Since this is the case and there are no submit buttons, you can loop over the form elements array and add 3 each time instead of incrementing one only, e.g.

That would be an idea, but rather than add it in the markup, I would say it would be better to check the type and check the next elements instead. I'm not too keen on the multiple forms idea because it causes more problems than it solves.

Possibly or what I've posted above.

I'd go for your solution too (sounds more solid)

sorry... but I have reset all... I am desperate because do not find solution to the my problem javascript...

See #25 above. Did you try that?

Yes but not working...

I write new function... try please this web page

This code working if one checkbox one input type text...

In my case I need:

and the string is:

can you help me?

OK, so the requirements changed again. Why have you named the select object and text box elements with the same name. If you name them differently, it'll be easier to access them, e.g. C1sel for the select element, C1t1 for the first text box and C1t2 for the second text box.

thanks acoder...I see the solution... try this please:

http://free.7host06.com/popigu/

My problem this is:

Good job! Is it all working fine now?

No, working not fully...

the problem is this part of the code:

Because submit the form when only checkbox is selected... do you try my link?

http://free.7host06.com/popigu/

So you want it to submit/close even if no checkbox is checked?

Hi acoder, thanks x your reply.

I close this project, the final and working solution is: