Usualy, after the user fills the form and submit it, the page is reloaded and the form is empty. In case of an error, the user need to write again all those data to submit the form.
It is user-friendly if we keep the data that the user has added in form fields before submitting it, he will correct /write only data in the fields with errors.
<?php // array with values for each form field, most empty $fval = array('fname'=>'', 'femail'=>'', 'fgen'=>'', 'fgenm'=>'male', 'fgenf'=>'female', 'ffood'=>'', 'fmess'=>''); // a variable for errors, initially empty $ferror = ''; // if there is data submited from form, if(isset($_POST['fsubmit'])) { $fval = array_replace($fval, $_POST); // add $_POST data in $fval to replace the initial values // validate the fields and add the errors in $ferror variable if(strlen($_POST['fname'])<3) $ferror .= '- The Name must contains at least 3 characters <br/>'; if(!preg_match("/^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$/", $_POST['femail'])) { $ferror .= '- Add a valid e-mail address <br/>'; } if(!isset($_POST['fgen'])) $ferror .= '- Select a Gender <br/>'; if($_POST['ffood']=='--' or $_POST['ffood']=='') $ferror .= '- Select a Food preference <br/>'; // if there is no errors ($ferror is empty) sets a $confirm if($ferror==='') $confirm = '<h3>The data was successfully added</h3>'; } /* Now define the Form */ // array with values for Select dropdown list $select_food = array('fruits', 'vegetables', 'cereals', 'dairy', 'cakes'); // sets the <option> tags for Select list $ffood = '<option>--</option>'; for($i=0; $i<count($select_food); $i++) { // sets selected attribute $selattr = ($select_food[$i]==$fval['ffood']) ? ' selected="selected"' : ''; $ffood .= '<option value="'. $select_food[$i]. '"'. $selattr. '>'. $select_food[$i]. '</option>'; } // define the checked attribute for radio buttons, according to the value of 'fgen' $fgenm_check = ($fval['fgen']==$fval['fgenm']) ? ' checked="checked"' : ''; $fgenf_check = ($fval['fgen']==$fval['fgenf']) ? ' checked="checked"' : ''; // sets a variable with the HTML code for form $form = '<form action="" method="post"> Name: <input type="text" name="fname" id="fname" value="'. $fval['fname']. '" /><br/> E-mail: <input type="text" name="femail" id="femail" value="'. $fval['femail']. '" /><br/> Gender: <input type="radio" name="fgen" id="fgenm" value="'. $fval['fgenm']. '"'. $fgenm_check. ' />Male <input type="radio" name="fgen" id="fgenf" value="'. $fval['fgenf']. '"'. $fgenf_check. ' />Female<br/> Food preference: <select id="ffood" name="ffood">'. $ffood. '</select><br/> Message (<i>optional</i>):<br/> <textarea name="fmess" id="fmess" rows="5", cols="30">'. $fval['fmess']. '</textarea><br/> <input type="submit" name="fsubmit" id="fsubmit" value="Submit" /><br/> </form>'; // if $confirm is set, display it, else, display $ferror and $form if(isset($confirm)) echo $confirm; else echo '<div style="color:red;">'. $ferror. '</div><br/>'. $form; ?>- Test yourself this example, by adding the code above in a php file.
<?php // define variables with the value for each field // the value from POST, if this exist, or an empty value $name = isset($_POST['name']) ? $_POST['name'] : ''; $email = isset($_POST['email']) ? $_POST['email'] : ''; $msg = isset($_POST['msg']) ? $_POST['msg'] : ''; // define the form into a variable $fhtml = '<form action="" method="post"> Name: <input type="text" name="name" value="'. $name. '" /><br/> Email: <input type="text" name="email" value="'. $email. '" /><br/> Message:<br/> <textarea cols="5" rows="35" name="msg">'. $msg. '</textarea><br/> <input type="submit" value="Send" /> </form>'; echo $fhtml; // output /display the form ?>
<ul> <li>http://coursesweb.net/html/</li> <li>http://coursesweb.net/css/</li> </ul>
.some_class { display: list-item; }
var obj = { "courses": ["php", "javascript", "ajax"] }; var jsonstr = JSON.stringify(obj); alert(jsonstr); // {"courses":["php","javascript","ajax"]}
$strhtml = '<body><div id="dv1">CoursesWeb.net</div></body>'; $dochtml = new DOMDocument(); $dochtml->loadHTML($strhtml); $elm = $dochtml->getElementById("dv1"); echo $elm->nodeValue; // CoursesWeb.net