how to assign variable value after window onload

How to show the textboxes.....see. The max value I will assign after onload so following code did not work........

max value is equal to the user selected files count. I cant assign before onload the page..

<form action="" method="post" onsubmit="store(this); return false">
    <p>
        <input type="button" name="prev" onclick="goto(this.form, -1)" value="Previous" />
        <input type="button" name="next" onclick="goto(this.form, +1)" value="Next" />
    </p>
    <divs>
        <noscript>Please enable JavaScript to see this form correctly</noscript>
    </divs>
    <div id="filename"></div>

    <p>
        <input type="submit" name="submit" value="Store in database" />
    </p>
</form>




 <!-------------user selected file's name in array------------------>
 var filelist=new Array();
          function insert(filess) 
             {
                filelist[filelist.length]=filess; 
                var sahan=(filelist.valueOf());
               }


max=filelist.length;

window.onload = function() {
    v开发者_运维知识库ar form = document.forms[0];
    var container = form.getElementsByTagName('divs')[0];
    container.innerHTML = '';
    for (var i = 0; i < max; i++)
        container.innerHTML += '<fieldset style="width: 250px; height: 80px;"><legend>Files of ' +(i + 1) + ' / ' + max + '</legend><input type="text" name="name' + i + '" /><br /><br /><input type="text" name="topic' + i + '" /></fieldset>';
    goto(form, 0);
}

There are too many issues to mention.

1. you need to get the maximum before you use it, so call insert and from there issue the call to build the list
2. you need to either pass the maximum around OR make it global in scope
3. you are using two different ajax methods
4. you are not using jQuery everywhere and so on.

Here is a working demo when maximum is set before onload.

http://jsfiddle.net/mplungjan/rnJWX/

var maximum=0, current = 0;
$(document).ready(function(){
    maximum=10;
    var container = $("#sankar");
    container.hide();
    container.empty();
    for (var i = 0; i < maximum; i++) {
      container.append('<fieldset style="width: 250px; height: 80px;"><legend>Files of ' +(i + 1) + ' / ' + maximum + '</legend><input type="text" name="name' + i + '" /><br /><br /><input type="text" name="topic' + i + '" /></fieldset>');
    }    
    goto(form, 0);
    container.show();
})


function goto(form, pos) {
    current += pos;
    $('#my_div').html("Hiding all "+maximum+" sets and showing set #"+current+"..."); // sankar[curent];
    form.prev.disabled = current <= 0;
    form.next.disabled = current >= maximum - 1;
// you can do jQuery here too
    var fields = form.getElementsByTagName('fieldset');
    for (var i = 0; i < fields.length; i++) fields[i].style.display = 'none';
    fields[current].style.display = 'block';
    form['name' + current].focus();
}

Well, since you've given your "container" element an ID, you should use document.getElementById('divs') instead of form.getElementsByTagName('divs')[0]. In your current code, container would be undefined.