[Resolved] passing javascript to php

amrigo

i need to use a onchange javascript method to pass the select box value to a php variable. how can it be done?

Thank´s in advance

jstarkey

Originally posted by amrigo
i need to use a onchange javascript method to pass the select box value to a php variable. how can it be done?

What do you want with the PHP variable? If you're just trying to update a DB you can load a tmp page with the var as an argument. I'm assuming you're aware that PHP is server-side and JS is client-side, so they can't interact directly.

amrigo

I do have three select boxes.
- the first let you choose a city
- the others display the streets that belong to the previous selected city.

So i need to pass the variable "$city" to make the query that brings all the streets from that city in the select box 2 and 3.

But how it can be done without submiting the form, if ph is interpreted only server side?

bubblenut

It can't

amrigo

can i self submit the form to process the city and bring the streets and after the second submit, being drived to another php aplication

The_Chancer

It can...

You will have to use some clever javascript though.

YOu can load all the variables in the main page load, then dependant on what the first select box value is - then the correct values are shown in the second box.

see http://www.fish4cars.co.uk for an example...

Pick a manufacturer, then the cars associated with it are then shown.

Similar to cities and streets...

The_Chancer

The self submit option is also definately workable.

onchange=do_submit();

do_submit()
{
document.formname.action="<? echo $_SERVER['PHP_SELF'];?>?select1=true";
document.formname.submit();
}

Then make the PHP round it so if select1 is set, then load up the bits for the select2 box etc...

(alternatively you can always use )

if (isset($_POST['selectboxname']))
{
//code here
}

bubblenut

I was half way through writing a respone saying "Yea but that would mean downloading ton's of data rah rah rah can't do that rah rah rah" when I thought "better have a look at the site before you go off on one"; lucky I did. That's very nicely done. I like 😃

amrigo

i am not sure that i understand!
you mean loading all the streets i have for all my cityes?
if so i will must load the streets from 980 cityes.

amrigo

sorry i did not read your second post
i think that´s the way : giving two submits

The_Chancer

Ahh - now you mention 980 cities... would mean a hell of a lot of data...

I take it this is for a public app though ? If it was LAN based - you might have gotten away with it (just)

Look for a search option as well so you can rifle through the select box, cos trying to do it with that many in the list will be hell....

function search(object) 
	{
		var found = false;
    		var agent = object.agentText.value.toUpperCase();
		if (object.agentText.value.length > -1) 
		{
		        for (var i=0; (i < object.agentSelect.length) && !found; i++) 
		        {
				var text = object.agentSelect.options[i].text;
            			agentSelect = text.toUpperCase();
			        if (agentSelect.indexOf(agent) == 0) 
			        {
					found = true;
                			object.agentSelect.options[i].selected = true;
            			}
            			else if (agentSelect > agent) 
            			{
			                found = true;
                			object.agentSelect.options[i].selected = true;
            			}
        		}
		        if (!found)
                	object.agentSelect.options[object.agentSelect.length - 1].selected = true;
    		}
	}

May help you on your quest....

P.S. Bubble - it is a nice little script innit ?

amrigo

This aplication will be acessed by old computers with 56 k modens in a dial-up connection, in all the 980 cityes.

What the search object code can do?

The_Chancer

It provides a way of searching the select box for the text entered in a textbox within the form. Saves people having to look through 980 rows in the select box...

amrigo

i will begin to write the code to first self submitting and second submiting to the frinal php script

amrigo

Using the doSubmit can i specify the method to Post?

The_Chancer

I would put that as

and run from there...

amrigo

using do-submit function did not work
while i did not figure out why i am using onChange="this.form.sumit()"

amrigo

But in the javascript function do_submit there is not the need to specify the method for the submiting?

where i can specify the methos inside the do-submit function?

bubblenut

I think you'd have to do it yourself, before you do the submit do something like
document.forumname.method="POST";
don't know about this for sure. Try it out.
Bubble

amrigo

i try! and track the var with var_dump ()!

And the variable is a post variable.

Even if i did not mention in the javascript function, but in the html form tag it is mentioned that the methos is post

I think this thread is now solved

a take a look at this class tutorial but i am implementing the solution discussed here on the forum

http://www.zend.com/zend/tut/drop-down.php

Thanks a lot

Cheers