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| Code | |||||
<?php /* Form 1.1 Copyright 1998 by Jay Bloodworth Released under GNU Public License v2.0, available at www.fsf.org Most important part of license: This software is provided with NO WARRANTY. None. Zilch. Not even an implied warranty for fitness of purpose. The following PHP3 code provides a nice class interface for html forms. In particular, it provides a single, reasonably consistent interface for all form elements regardless of the html syntax. It tries to do the right thing with all 'reasonable' (IMHO) variations on input syntax. The interface also provides a regexp base validation function for the server side, along with javascript validation (for versions of jscript that support regexps) on the client side. There is also a function to load any or all the fields of a defined for with defaults based on GET or POST data. In general, you design a form by doing $formvar = new form and then calling the the $formvar->add_element() function with a single arg consisting of an associative array with appropriate values (as given below) to define that type of element. Most of the form paramters are self explanatory, but a couple deserve special comment: options => This is an array of options presented with a SELECT element. It can either be an array of labels or an array of associatives arrays of the form array("label"=>"Whatever You Want","value"=>"whatever") If you choose the second form the label is what gets displayed and value is what is submitted. value => For SELECT items, this is the item that is preselected. It can be given as either the label or value of the item. For SELECT MULTIPLE items, it can be an array. valid_regex => For INPUT items of type text or password, the submission will be checked against this regex for validity. Note that only the latest versions of Explorer and Navigator have a javascript engine that supports regexes, so this test is meaningless for older clients. The server side validation can still use it though. Note also that the regex is actually checked to see if it occurs anywhere in the input as a subexpression (I declare this a feature, not a bug). If you want the regex to match the whole string, put it between ^ and $. E.G. [0-9]+ will match 'abc123def', which may not be what you want. If you want to accept just digits, use $[0-9]+ valid_e => Message to be returned if the input is invalid. For text and password entries, this is done with regexes as above. For radio buttons, the entry is invalid if no button in the set has been selected. For SELECT items, the submission is invalid if the first item in the list is selected; this is useful if you want the first item in the list to be a label. If you don't want this behavior, just leave valid_e unset. length_e => Message to be returned if a text or password entry is less that min_l. To show form elements, you usually use $formvar->show_element("element_name"), but in the case of radio buttions and submit buttons you use $formvar->show_element("element_name","element_value") since you may have multiple elements with the same name. To close the form, use $myform->finish(). Not only will this output the </form> tag, it will output any elements of type "hidden" you defined, so there is no need to call show_element for these. The $myform->validate function takes one mandatory and one optional argument. This function will return the defined error message if one the form elements doesn't meet it's validation requirements, or it's first argument (usually a string) if everthing checks out. The optional second argument is a list of names of form elements to perform validation on; all others will be ignored (without this, all elements will be checked). The $myform->load_defaults function will load the form elements with default values based on variables that have the same name as the form elements; this function is intended to be used to recycle previous input to the form so the user won't have to enter everything again if he or she makes one mistake. The function takes one optional argument, a list of names of form elements. As above, if this argument is given, only these elements will be affected; otherwise all of them will. Form elements defined by: array("type"=>, "name"=>, "value"=>, "options"=>, "size"=>, "rows"=>, "cols"=>, "wrap"=>, "src"=>, "checked"=>, "min_l"=>, "max_l"=>, "extra_html"=>, "valid_regex"=>, "length_e"=>, "valid_e"=>, */ // This function is needed because unset is current (3.0b6) buggy // when used for associative arrays. function myunset($a,$key) { reset($a); while ($i = current($a)) { if ($key != ($k = key($a))) $t[$k] = $i; next($a); } $a=$t; } class form { var $elements; var $hidden; function load_defaults($deflist= "") { if ($deflist) { reset($deflist); $el = $this->elements[current($deflist)]; } else { reset($this->elements); $el = current($this->elements); } while ($el) { if (!($eltype = $el[ "type"])) { $el = current($el); $eltype = $el[ "type"]; } $elname = $el[ "name"]; global $$elname; $elval = $$elname; switch ($eltype) { case "text": case "pass": case "textarea": $this->elements[$elname][ "value"] = $elval; break; case "checkbox": if (isset($elval)) $this->elements[$elname][ "checked"] = "yes"; else $this->elements[$elname][ "checked"] = "no"; break; case "radio": reset ($this->elements[$elname]); while ($temp = current($this->elements[$elname])) { $temp[ "checked"] = "no"; next($this->elements[$elname]); } $this->elements[$elname][$elval][ "checked"] = "yes"; break; case "select": case "select multiple": $this->elements[$elname][ "value"] = $elval; $elops = $this->elements[$elname][ "options"]; if (is_array($elops)) { reset($elops); $elops = current($elops); if (isset($this->elements[$elname][ "valid_e"]) && !((is_array($elops) && (($elops[ "label"] == $elval) || ($elops[ "value"] == $elval))) || ($elops == $elval))) { myunset(&$this->elements[$elname][ "options"],0); unset($this->elements[$elname][ "valid_e"]); } } break; } if ($deflist) { next($deflist); $el = $this->elements[current($deflist)]; } else { next($this->elements); $el = current($this->elements); } } } function start($jsv_name= "",$method= "",$action= "",$target= "") { global $PHP_SELF; if (!$method) $method = "POST"; if (!$action) $action = $PHP_SELF; if (!$target) $target = "_self"; if ($jsv_name) { echo "<script language=\"javascript\">\n<!--\n"; echo "function ${jsv_name}_Validator(f) {\n"; reset($this->elements); while ($el = current($this->elements)) { if (!$el[ "type"]) $el = current($el); $elname = $el[ "name"]; $eltype = $el[ "type"]; switch ($eltype) { case "text": case "password": $el_e = $el[ "length_e"]; if ($elmin = $el[ "min_l"]) { echo "if (f.${elname}.value.length < $elmin) {\n"; echo "alert(\"$el_e\");\n"; echo "f.${elname}.focus();\n"; echo "return(false);\n}\n"; } if ($el_e = $el[ "valid_e"]) { $el_re = $el[ "valid_regex"]; echo ( "if (window.RegExp) {\n"); echo "var reg = new RegExp(\"$el_re\");\n"; echo "if (!reg.test(f.${elname}.value)) {\n"; echo "alert(\"$el_e\");\n"; echo "f.${elname}.focus();\n"; echo "return(false);\n"; echo "}\n}\n"; } break; case "radio": if ($el_e = $el[ "valid_e"]) { echo "var l = f.${elname}.length;\n"; echo "var radioOK = false;\n"; echo "for (i=0; i<l; i++)\n"; echo "if (f.${elname}[i].checked) {\n"; echo "radioOK = true;\n"; echo "break;\n"; echo "}\n"; echo "if (!radioOK) {\n"; echo "alert(\"$el_e\");\n"; echo "return(false);\n"; echo "}\n"; } break; case "select": if ($el_e = $el[ "valid_e"]) { echo "if (f.${elname}.selectedIndex == 0) {\n"; echo "alert(\"$el_e\");\n"; echo "f.${elname}.focus();\n"; echo "return(false);\n"; echo "}\n"; } break; } next($this->elements); } echo "}\n//-->\n</script>\n"; echo "<form method=\"$method\" "; echo "action=\"$action\" "; echo "target=\"$target\" "; echo "onsubmit=\"return ${jsv_name}_Validator(this)\">\n"; } else echo "<form method=\"$method\" action=\"$action\" target=\"$target\">"; } function finish() { if ($this->hidden) { reset($this->hidden); while ($elname = current($this->hidden)) { $elval = $this->elements[$elname][ "value"]; echo "<input type=\"hidden\" name=\"$elname\" value=\"$elval\">\n"; next($this->hidden); } } echo "</form>\n"; } function validate($default,$vallist= "") { if ($vallist) { reset($vallist); $el = $this->elements[current($vallist)]; } else { reset($this->elements); $el = current($this->elements); } while ($el) { if (!$el[ "type"]) $el = current($el); $elname = $el[ "name"]; $eltype = $el[ "type"]; global $$elname; $elval = $$elname; switch ($eltype) { case "text": case "password": $el_e = $el[ "length_e"]; if (($elmin = $el[ "min_l"]) && strlen($elval) < $elmin) return $el_e; $elreg = $el[ "valid_regex"]; if (($el_e = $el[ "valid_e"]) && !ereg($elreg,$elval)) return $el_e; break; case "radio": if (($el_e = $el[ "valid_e"]) && !$elval) return $el_e; break; case "select": if ($el_e = $el[ "valid_e"]) { $elops = $el[ "options"]; reset($elops); $elops = current($elops); if (is_array($elops)) $elops = $elops[ "value"]; if ($elval == $elops) return $el_e; } break; } if ($vallist) { next($vallist); $el = $this->elements[current($vallist)]; } else { next($this->elements); $el = current($this->elements); } } return($default); } function add_element($el) { if (($el[ "type"] != "radio") && ($el[ "type"] != "submit")) $this->elements[$el[ "name"]] = $el; else $this->elements[$el[ "name"]][$el[ "value"]] = $el; if ($el[ "type"] == "hidden") $this->hidden[] = $el[ "name"]; } function show_element($name,$value= "") { if ($value) $el = $this->elements[$name][$value]; else $el = $this->elements[$name]; $eltype = $el[ "type"]; $elname = $el[ "name"]; $elvalue = $el[ "value"]; $elextrahtml = $el[ "extra_html"]; switch ($eltype) { case "text": case "password": echo "<input type=\"$eltype\" name=\"$elname\" value=\"$elvalue\""; if ($el[ "max_l"]) { $elmaxl = $el[ "max_l"]; echo " maxlength=\"$elmaxl\""; } if ($elsize = $el[ "size"]) echo " size=\"$elsize\""; echo " $elextrahtml>\n"; break; case "image": echo "<input type=\"$eltype\" name=\"$elname\" value=\"$elvalue\""; $elsrc = $el[ "src"]; echo "src=\"$elsrc\" $elextrahtml>\n"; break; case "checkbox": case "radio": if (($elchk = $el[ "checked"]) && $elchk != "no") $elextrahtml .= " checked"; case "hidden": case "submit": case "reset": echo "<input type=\"$eltype\" name=\"$elname\" value=\"$elvalue\""; echo " $elextrahtml>\n"; break; case "textarea": $elrows = $el[ "rows"]; $elcols = $el[ "cols"]; $elwrap = $el[ "wrap"]; echo "<textarea name=\"$elname\" "; echo "rows=\"$elrows\" cols=\"$elcols\" wrap=\"$elwrap\""; echo " $elextrahtml>\n"; echo "$elvalue"; echo "</textarea>"; break; case "select": case "select multiple": $elsize = $el[ "size"]; $elops = $el[ "options"]; echo "<$eltype name=\"$elname"; if ($eltype == "select multiple") echo "[]\""; else echo "\""; if ($elsize) echo " size=\"$elsize\""; echo " $elextrahtml>\n"; if (is_array($elops)) while ($curop = current($elops)) { echo "<option"; if (is_array($curop)) { $curval = $curop[ "value"]; $curop = $curop[ "label"]; echo " value=\"$curval\""; } if (is_array($elvalue)) { reset($elvalue); while ($temp = current($elvalue)) { if ($temp == $curval || $temp == $curop) echo " selected"; next($elvalue); } } elseif ((isset($curval) && ($elvalue == $curval)) || strval($elvalue) == strval($curop)) echo " selected"; echo ">$curop</option>\n"; next($elops); } echo "</select>\n"; break; } } } ?> | |||||
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