I'm using smarty template. My form code from smarty template is as below:
<form action="" name="manage_users" id="manage_users" method="post" >
<input type="hidden" name="op" value="{$op}">
<table width="90%" border="0" cellspacing="0" cellpadding="0" align="center">
<tr>
<td align="center">
<table cellpadding="2" cellspacing="2" border="0">
<tr>
<td colspan="2" align="center"></td>
</tr>
{if $error_msg != ""}
<tr>
<td align="center" class="errorMsg" colspan="2">{$error_msg.error_msgs}<br /></td>
</tr>
{/if}
{if $info_msg !="" && $error_msg==""}
<tr>
<td align="center" class="success_msg" colspan="2">{$info_msg}<br /></td>
</tr>
{/if}
{if $site_id!='ENTPRM'}
{if $op == 'add' && $all_groups}
<tr><td align="left"><label><b>{'Select Groups'|signal_on_error:$error_msg:'groups'}</b> <strong style="color:red">*</strong></label></td></tr>
<tr>
{assign var='i' value=0}
{foreach from=$all_groups item="group"}
{if $i%2 == 0}</tr><tr>{/if}
<td valign="top" align="left" width="200">
<table cellpadding="5" cellspacing="5" border="0">
<tr><td><input type="checkbox" name="parent_groups[]" id="{$group.parent_id}" onchange="check_subgroups(this.id, 'class_{$group.parent_id}'); return false;" value="{$group.parent_id}" {foreach from=$data.groups item=user_grp} {if $user_grp == $group.parent_id} checked="checked" {/if}{/foreach} ><b> {$group.parent_name} </b></td></tr>
<input type="hidden" name="main_groups[]" id="main_groups[]" value="{$group.parent_id}">
{foreach from=$group.subgroups item=subgroup}
<tr><td><input type="checkbox" name="groups_{$group.parent_id}[]" id="{$subgroup.group_id}" class="class_{$group.parent_id}" onchange="uncheck_main_group('{$group.parent_id}');" value="{$subgroup.group_id}" {foreach from=$data.groups item=user_grp} {$user_grp} {if $user_grp==$subgroup.group_id} checked="checked" {/if}{/foreach} style="margin-left:20px;"> {$subgroup.group_name}</td></tr>
{/foreach}
</table>
{assign var='i' value=$i+1}
{/foreach}
</td>
</tr>
{/if}
{/if}
<div id="add_more_user">
{if $op=='add' || $op=='edit'}
<tr>
<td><label for="user_first_name"><b>{'First Name'|signal_on_error:$error_msg:'user_first_name'}</b> <strong style="color:red">*</strong></label><br>
<input type="text" name="user_first_name" value="{$data.user_first_name}" class="inputfield" />
</td>
</tr>
<tr>
<td height="10" > </td>
</tr>
<tr>
<td><label for="user_last_name"><b>{'Last Name'|signal_on_error:$error_msg:'user_last_name'}</b> <strong style="color:red">*</strong></label><br>
<input type="text" name="user_last_name" value="{$data.user_last_name}" class="inputfield" />
</td>
</tr>
<tr>
<td height="10" > </td>
</tr>
<tr>
<td><label for="user_dob"><b>{'Date Of Birth'|signal_on_error:$error_msg:'user_dob'}</b> <strong style="color:red">*</strong></label><br>
<input type="text" name="user_dob" id="user_dob" value="{$data.user_dob}" class="inputfield" />
</td>
</tr>
<tr>
<td height="10" > </td>
</tr>
<tr>
<td><label for="user_email"><b>{'Email'|signal_on_error:$error_msg:'user_email'}</b> <strong style="color:red">*</strong></label><br>
<input type="text" name="user_email" value="{$data.user_email}" class="inputfield" />
</td>
</tr>
<tr>
<td height="10" > </td>
</tr>
{/if}
{if $op == 'add'}
<tr>
<td><label for="auto_username_pwd"> <b>Autogenerate User Password</b> <strong style="color:red">*</strong></label><br>
<input type="radio" name="auto_username_pwd" id="auto_username_pwd_no" value="No" checked="checked" onchange="toggle_username_password(this.id);" onfocus="toggle_username_password(this.id);"/> No
<input type="radio" name="auto_username_pwd" id="auto_username_pwd_yes" value="Yes" {if $data.auto_username_pwd =='Yes'} checked="checked" {/if} onchange="toggle_username_password(this.id);" onfocus="toggle_username_password(this.id);"/> Yes
</td>
</tr>
<tr>
<td height="10" > </td>
</tr>
<tr>
<td id='auto_username_password' {if $data.auto_username_pwd=='Yes'} style="padding:0px; margin:0px;display:none;" {else} style="padding:0px; margin:0px;" {/if}>
<table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><label for="user_password"><b>{'Password'|signal_on_error:$error_msg:'user_password'}</b> <strong style="color:red">*</strong></label><br>
<input type="password" name="user_password" id="user_password" value="{$data.user_password}" class="inputfield" maxlength="15" style="width:130px;"/>
<br><I>(Use 6 to 15 characters)</I>
</td>
</tr>
<tr>
<td height="10" > </td>
</tr>
<tr>
<td><label for="retype_user_password"><b>{'Re-type Password'|signal_on_error:$error_msg:'retype_user_password'}</b> <strong style="color:red">*</strong></label><br>
<input type="password" name="retype_user_password" id="retype_user_password" value="{$data.retype_user_password}" class="inputfield" maxlength="15" style="width:130px;"/>
<br><I>(Use 6 to 15 characters)</I>
</td>
</tr>
<tr>
<td height="10"> </td>
</tr>
</table>
</td>
</tr>
<input type="hidden" name="user_subscription" id="user_subscription_lifetime" value="lifetime" />
{/if}
<tr>
<td height="10"> <input type="hidden" name="user_id" value="{$data.user_id}" /></td>
</tr>
</div>
<tr>
<td align="center"><table cellpadding="0" cellspacing="0" border="0">
<tr>
{if $op=='add'}
<td><input type="submit" name="submit" value="Add More" class="submit" /></td>
<td> </td>
{/if}
<td><input type="submit" name="submit" value="{$submit_value}" class="submit" /></td>
<td> </td>
<td><input type="button" name="back" value="Back" class="submit" onclick="javascript:window.location.href='{$control_url}modules/users/view_users.php?op=view{if $user_name!=''}&user_name={$user_name}{/if}{if $user_email_id!=''}&user_email_id={$user_email_id}{/if}{if $user_group!=''}&user_group={$user_group}&{/if}{if $user_sub_group!=''}&user_sub_group={$user_sub_group}{/if}'" /></td>
</tr>
<tr>
<td colspan="2" align="center" > </td>
</tr>
</table></td>
</tr>
</table></td>
</tr>
</table>
</form>
When I click on submit button the form is redirected to the page view_users.php. But I didn't see this page in action attribute of a form. Then I'm not getting how could this form redirects to view_users.php. Can anyone help me in this regard and clear my doubts. Thanks in advance.
the same page if no action is given in the form
when you provide no action attribute value the browser will submit the form to the same page it rendered the form with. However this behavior is not documented rfc-1867