index.php
<form method="post" action="process.php" enctype="multipart/form-data" >
Firstname: <input type="text" name="firstname" />
<br />
Lastname: <input type="text" name="lastname" />
<br />
Description: <textarea name="description" rows="10" cols="50" ></textarea>
<br />
Gender:
<input type="radio" name="gender" value="male" checked /> Male
<input type="radio" name="gender" value="female" /> Female
<br />
Programming Language (single):
<select name="language" >
<option value="c" >C</option>
<option value="c++" >C++</option>
<option value="java" >Java</option>
<option value="javascript" selected >Javascript</option>
<option value="php" >PHP</option>
</select>
<br />
Programming Languages (multiple): (hold ctrl + click item)
<select name="languages[]" multiple >
<option value="c" >C</option>
<option value="c++" selected >C++</option>
<option value="java" >Java</option>
<option value="javascript" selected >Javascript</option>
<option value="php" >PHP</option>
</select>
<br />
Hobby (single): <input type="checkbox" name="hobby" value="studying" /> Studying
<br />
Hobbies (multiple):
<input type="checkbox" name="hobbies[]" value="studying" /> Studying
<input type="checkbox" name="hobbies[]" value="reading" checked /> Reading
<input type="checkbox" name="hobbies[]" value="writing" /> Writing
<input type="checkbox" name="hobbies[]" value="sleeping" checked /> Sleeping
<br />
File Upload: <input type="file" name="upload" /><br />
Preview: <img src="#" />
<br />
<hr />
<input type="submit" value="Submit" />
</form>
display result form server
<div id="output"></div>
get formHTML element and add onsubmit event, and create formData, then call ajax function with arguments formHTML, formData and output display ("#output")
<script>
/* submit form */
// https://api.jquery.com/jquery.each/
/*
* array.each( function( index, element ) )
* $.each( array, callback )
*/
// https://www.w3schools.com/jquery/misc_each.asp
/* get all form */
$( "form" ).each( function () {
/* each form add onsubmit event */
$( this ).bind( "submit", function (event) {
event.preventDefault(); // return false
var formHTML = event.target; // $( this ) => not work !!
console.log( formHTML ); // formHTML element
// https://developer.mozilla.org/en-US/docs/Web/API/FormData/Using_FormData_Objects
var formData = new FormData( formHTML );
console.log( formData );
// https://api.jquery.com/jquery.ajax/
// https://www.w3schools.com/jquery/ajax_ajax.asp
// https://www.w3schools.com/jquery/jquery_ref_ajax.asp
/* AJAX request */
ajax( formHTML, formData, "#output" ); // ajax( form, data, destination )
} );
});
</script>
ajax function
<script>
function ajax( form, data, destination )
{
$.ajax({
method: form.method,
url: form.action,
data: data,
/*
result type data
JSON.parse(data)
http://api.jquery.com/jQuery.ajax/
https://stackoverflow.com/questions/14322984/differences-between-contenttype-and-datatype-in-jquery-ajax-function
https://forums.asp.net/t/2087039.aspx?what+is+difference+between+dataType+and+contentType+in+jquery
*/
dataType: "HTML",
/* formData */
contentType: false, // formData with $_POST or $_FILES in server (PHP)
processData: false
})
/* handle success */
.done( function(result) {
$( destination ).html( result );
console.log(result);
} )
/* handle error */
.fail( function(error) {
alert("Cannot Set Data!");
console.error(error);
} );
}
</script>
add onchange event in input with file type, then display it with img tag
<script>
/* preview image */
$( "input[type='file']" ).on( "change", function () {
var preview = document.querySelector( "img" );
var file = document.querySelector( "input[type='file']" ).files[0];
var reader = new FileReader();
reader.addEventListener( "load", function () {
preview.height = 100;
preview.title = file.name;
preview.src = reader.result;
}, false );
if (file)
{
reader.readAsDataURL(file);
}
console.log( reader );
} );
</script>
process.php
echo "<pre>";
var_dump($_POST);
echo "</pre>";
Demo repl.it
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