我尝试使用
toDataURL
使 Ajax 发布 URl,ajax 调用是在 test.php
中进行的。我的保存功能已开启 save.php
。我的问题是,如果我先打开test.php
,则图像可以保存,然后图像将出现在我的目录中。我想要的是打开时保存图像save.php
。可以这样做吗?
测试.php
function submitdata(){
var canvas = document.getElementById('chart1');
var imgData = canvas.toDataURL('image/png', 1);
$.ajax({
type: "POST",
url: "save.php",
data: { imgData: imgData },
success: function(response) {
console.log(response);
}
});
}
$(document).ready(function() {
submitdata();
});
保存.php
function save_base64_image($base64_image_string, $output_file_without_extension, $path_with_end_slash="" ) {
$splited = explode(',', substr( $base64_image_string , 5 ) , 2);
$mime=$splited[0];
$data=$splited[1];
$mime_split_without_base64=explode(';', $mime,2);
$mime_split=explode('/', $mime_split_without_base64[0],2);
if(count($mime_split)==2)
{
$extension=$mime_split[1];
if($extension=='jpeg')$extension='jpg';
$output_file_with_extension=$output_file_without_extension.'.'.$extension;
}
file_put_contents( $path_with_end_slash . $output_file_with_extension, base64_decode($data) );
return $output_file_with_extension;
}
$image = $_POST['imgData'];
$path='images/chart_1';
save_base64_image($image, $path, $path_with_end_slash="" );
我也尝试使用这个功能
function save_base64_image($base64_image_string, $output_file_without_extension, $path_with_end_slash="" ) {
$splited = explode(',', substr( $base64_image_string , 5 ) , 2);
$mime=$splited[0];
$data=$splited[1];
$mime_split_without_base64=explode(';', $mime,2);
$mime_split=explode('/', $mime_split_without_base64[0],2);
if(count($mime_split)==2)
{
$extension=$mime_split[1];
if($extension=='jpeg')$extension='jpg';
$output_file_with_extension=$output_file_without_extension.'.'.$extension;
}
file_put_contents( $path_with_end_slash . $output_file_with_extension, base64_decode($data) );
return $output_file_with_extension;
}
$image = $_POST['imgData'];
$x1= chr(rand(0,25)+97) ;
$x2= chr(rand(0,25)+97) ;
$x3= chr(rand(0,25)+97) ;
$x4= chr(rand(0,9)+48) ;
$x5= chr(rand(0,9)+48) ;
$path = 'images/';
$filename = $path . 'chart1_' . $x1 . $x2 . $x3 . $x4 . $x5.'.png';
save_base64_image($image, $path, $filename);
打开时我的图像已保存
save.php
但我的图像不包含任何内容(空白)。
由于您的主要目的是完成画布的“保存图像”,但您不想使用两个独立的页面(一个HTML和一个PHP),所以我们可以使用两种不同的方法来做到这一点,但原理是相似的--- 将所需的函数合并到单个 PHP 文件中,该文件执行以下两项操作
方法1 - 使用ajax(调用自身)
PHP名称:
saveimagecanvas2.php
<?php
function save_base64_image($base64_image_string, $output_file_without_extension, $path_with_end_slash="" ) {
$splited = explode(',', substr( $base64_image_string , 5 ) , 2);
$mime=$splited[0];
$data=$splited[1];
$mime_split_without_base64=explode(';', $mime,2);
$mime_split=explode('/', $mime_split_without_base64[0],2);
if(count($mime_split)==2)
{
$extension=$mime_split[1];
if($extension=='jpeg')$extension='jpg';
$output_file_with_extension=$output_file_without_extension.'.'.$extension;
}
file_put_contents( $path_with_end_slash . $output_file_with_extension, base64_decode($data) );
return $output_file_with_extension;
}
if ($_POST['imgData']!="") {
$image = $_POST['imgData'];
$x1= chr(rand(0,25)+97) ;
$x2= chr(rand(0,25)+97) ;
$x3= chr(rand(0,25)+97) ;
$x4= chr(rand(0,9)+48) ;
$x5= chr(rand(0,9)+48) ;
$path="./images/".$x1.$x2.$x3.$x4.$x5;
save_base64_image($image, $path, $path_with_end_slash="" );
echo "Image saved - inside the 'images' folder " .$path ;
exit();
}
?>
<script
src="https://code.jquery.com/jquery-3.7.1.js"
integrity="sha256-eKhayi8LEQwp4NKxN+CfCh+3qOVUtJn3QNZ0TciWLP4="
crossorigin="anonymous"></script>
<div id=ajaxreturn></div>
<canvas id="chart1" width="200" height="100" >
<script>
var c = document.getElementById("chart1");
var ctx = c.getContext("2d");
ctx.beginPath();
ctx.arc(95, 50, 40, 0, 2 * Math.PI);
ctx.stroke();
</script>
<script>
function submitdata() {
var canvas = document.getElementById('chart1');
var imgData = canvas.toDataURL('image/png', 1);
$.ajax({
type: "POST",
url: "saveimagecanvas1.php",
data: { imgData: imgData },
success: function(response) {
document.getElementById('ajaxreturn').innerHTML=response;
}
});
}
window.onload = () => {
submitdata();
}
</script>
方法2 - 不使用ajax,而是使用表单提交给PHP本身
PHP名称:saveimagecanvas2.php
<?php
function save_base64_image($base64_image_string, $output_file_without_extension, $path_with_end_slash="" ) {
$splited = explode(',', substr( $base64_image_string , 5 ) , 2);
$mime=$splited[0];
$data=$splited[1];
$mime_split_without_base64=explode(';', $mime,2);
$mime_split=explode('/', $mime_split_without_base64[0],2);
if(count($mime_split)==2)
{
$extension=$mime_split[1];
if($extension=='jpeg')$extension='jpg';
$output_file_with_extension=$output_file_without_extension.'.'.$extension;
}
file_put_contents( $path_with_end_slash . $output_file_with_extension, base64_decode($data) );
return $output_file_with_extension;
}
if ($_POST['imgData']!="") {
$image = $_POST['imgData'];
$x1= chr(rand(0,25)+97) ;
$x2= chr(rand(0,25)+97) ;
$x3= chr(rand(0,25)+97) ;
$x4= chr(rand(0,9)+48) ;
$x5= chr(rand(0,9)+48) ;
$path="./images/".$x1.$x2.$x3.$x4.$x5;
save_base64_image($image, $path, $path_with_end_slash="" );
echo "Image saved - inside the 'images' folder " .$path ;
exit();
}
?>
<script
src="https://code.jquery.com/jquery-3.7.1.js"
integrity="sha256-eKhayi8LEQwp4NKxN+CfCh+3qOVUtJn3QNZ0TciWLP4="
crossorigin="anonymous"></script>
<canvas id="chart1" width="200" height="100" >
<script>
var c = document.getElementById("chart1");
var ctx = c.getContext("2d");
ctx.beginPath();
ctx.arc(95, 50, 40, 0, 2 * Math.PI);
ctx.stroke();
</script>
<script>
function submitdata() {
var canvas = document.getElementById('chart1');
var imgData = canvas.toDataURL('image/png', 1);
document.getElementById('imgData').value=imgData;
document.getElementById('form1').submit();
}
window.onload = () => {
submitdata();
}
</script>
<form id=form1 action="#" method=POST>
<input type=hidden name=imgData id=imgData>
</form>