使用 php 进行输出缓冲并使用 jQuery 发送 ob_get_contents
我正在尝试使用输出缓冲捕获 php 页面的内容：
<?php
function connect() {
$dbh = mysql_connect ("localhost", "user", "password") or die ('I cannot connect to the database because: ' . mysql_error());
mysql_select_db("PDS", $dbh);
return $dbh;
}
session_start();
if(isset($_SESSION['username'])){
if(isset($_POST['entryId'])){
//do something
$dbh = connect();
$ide = $_POST['entryId'];
$usertab = $_POST['usertable'];
$answertable = $usertab . "Answers";
$entrytable = $usertab . "Entries";
$query = mysql_query("SELECT e.date, q.questionNumber, q.question, q.sectionId, a.answer FROM $answertable a, Questions q, $entrytable e WHERE a.entryId = '$ide' AND a.questionId = q.questionId AND e.entryId = '$ide' ORDER BY q.questionNumber ASC;") or die("Error: " . mysql_error());
if($query){
//set variables
$sectionOne = array();
while($row=mysql_fetch_assoc($query)){
$date = $row['date'];
$sectionOne[] = $row;
}
}else{
//error - sql failed
}
}
?>
<?php
ob_start();
?>
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<script src = "jQuery.js"></script>
<script>
$(document).ready(function(){
$("#export").click(function(e){
//post to html2pdfconverter.php
$("#link").val("<?php echo(ob_get_contents()); ?>"); //THIS DOESN'T WORK
$("#nm").val("Entry Report.pdf");
$("form#sendanswers").submit();
});
});
</script>
<title>Personal Diary System - Entry Report - <?php echo($date); ?></title>
</head>
<body>
<h1>Entry Report - <?php echo($date); ?></h1>
<div id = "buttons">
<form id = "sendanswers" name = "sendanswers" action="html2pdfconverter.php" method="post">
<input type = "hidden" name = "link" id = "link" value = "">
<input type = "hidden" name = "nm" id = "nm" value = "">
<input type = "button" name = "export" id = "export" value = "Export As PDF"/>
</form>
</div>
<h3>Biological Information</h3>
<?php
echo('<p>');
$i = 0;
foreach($sectionOne as &$value){
if($i == 1 || $i == 3){
$image = "assets/urine".$i.".png";
echo("<br/>");
echo($value['question']." <br/> "."<img src = \"$image\"/>");
echo("<br/>");
}else{
echo($value['question'].' : '.$value['answer']);
}
echo("<br/>");
$i++;
}
echo('</p>');
?>
</body>
</html>
<?php
}
$contents = ob_get_contents(); //THIS WORKS
ob_end();
?>
我使用 ob_get_contents(); 将 ob 的内容分配给 $contents这是可行的，并且回显 $contents 会复制 html 页面。
然而，在我的 jQuery 中，我尝试使用以下方法将其分配给隐藏文本字段（“链接”）：
$("#link").val("<?php echo($contents); ?>");
但这不起作用。我有一种感觉，因为我访问 $contents 太早了，但不太确定...有什么想法吗？
I am trying to capture the contents of my php page using output buffering:
<?php
function connect() {
$dbh = mysql_connect ("localhost", "user", "password") or die ('I cannot connect to the database because: ' . mysql_error());
mysql_select_db("PDS", $dbh);
return $dbh;
}
session_start();
if(isset($_SESSION['username'])){
if(isset($_POST['entryId'])){
//do something
$dbh = connect();
$ide = $_POST['entryId'];
$usertab = $_POST['usertable'];
$answertable = $usertab . "Answers";
$entrytable = $usertab . "Entries";
$query = mysql_query("SELECT e.date, q.questionNumber, q.question, q.sectionId, a.answer FROM $answertable a, Questions q, $entrytable e WHERE a.entryId = '$ide' AND a.questionId = q.questionId AND e.entryId = '$ide' ORDER BY q.questionNumber ASC;") or die("Error: " . mysql_error());
if($query){
//set variables
$sectionOne = array();
while($row=mysql_fetch_assoc($query)){
$date = $row['date'];
$sectionOne[] = $row;
}
}else{
//error - sql failed
}
}
?>
<?php
ob_start();
?>
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<script src = "jQuery.js"></script>
<script>
$(document).ready(function(){
$("#export").click(function(e){
//post to html2pdfconverter.php
$("#link").val("<?php echo(ob_get_contents()); ?>"); //THIS DOESN'T WORK
$("#nm").val("Entry Report.pdf");
$("form#sendanswers").submit();
});
});
</script>
<title>Personal Diary System - Entry Report - <?php echo($date); ?></title>
</head>
<body>
<h1>Entry Report - <?php echo($date); ?></h1>
<div id = "buttons">
<form id = "sendanswers" name = "sendanswers" action="html2pdfconverter.php" method="post">
<input type = "hidden" name = "link" id = "link" value = "">
<input type = "hidden" name = "nm" id = "nm" value = "">
<input type = "button" name = "export" id = "export" value = "Export As PDF"/>
</form>
</div>
<h3>Biological Information</h3>
<?php
echo('<p>');
$i = 0;
foreach($sectionOne as &$value){
if($i == 1 || $i == 3){
$image = "assets/urine".$i.".png";
echo("<br/>");
echo($value['question']." <br/> "."<img src = \"$image\"/>");
echo("<br/>");
}else{
echo($value['question'].' : '.$value['answer']);
}
echo("<br/>");
$i++;
}
echo('</p>');
?>
</body>
</html>
<?php
}
$contents = ob_get_contents(); //THIS WORKS
ob_end();
?>
I assign the contents of ob to $contents using ob_get_contents(); This works, and echoing $contents duplicates the html page.
However, in my jQuery, I am trying to assign this to a hidden text field ('link') using:
$("#link").val("<?php echo($contents); ?>");
This doesn't work however..And I have a feeling its because I am accessing $contents too eraly but not too sure...any ideas?
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评论（2）
当您执行 ob_get_contents 调用时，您只输出了大约 10 行 javascript 和 html。 PHP 将不会回到过去并神奇地填充执行 ob_get_contents() 的文档的其余部分。
基本上，当页面开始出现时，您就将页面从激光打印机中撕下来，而打印机仍在打印页面的下半部分。
我不明白您为什么要将页面内容嵌入到输入字段中。如果你想以某种方式将页面的内容缓存在输入字段中，你可以使用 JS 获取
$('body')的 .innerHTML 。at the point you do that ob_get_contents call, you've only output about 10 lines of javascript and html. PHP will NOT reach back in time and magically fill in the rest of the document where you do this ob_get_contents().
You're basically ripping the page out of the laser printer the moment the page starts emerging, while the printer is still printing the bottom half of the page.
I fail to see why you want to embed the contents of your page into an input field. If you want to somehow cache the page's content in an input field, you can just use JS to grab the .innerHTML of
$('body').嗯，你有两个问题。
第一个是你怀疑的。稍后您才能访问这些内容。您可能没有意识到的第二个问题是，即使您设法找到一种方法对其进行重新排序并使其正常工作，您也会在 JavaScript 中遇到引用问题。它是递归的，但方式很糟糕。
相反，您应该做的是更改您的
$('#export').click处理程序以执行 Ajax 调用，在单独的 PHP 脚本中呈现您需要显示在服务器上的链接中的 HTML (不需要输出缓冲），然后让您的代码按照您现在在点击处理程序中尝试执行的方式将该调用的结果注入到页面中。Well, you have two problems.
The first is what you suspect. You can't access that stuff until later. The second problem which you may not realize is that you will have quoting issues in JavaScript even if you manage to find a way to reorder this and make it work. It's recursive, in a bad way.
What you should do instead is change your
$('#export').clickhandler to do an Ajax call, render the HTML you need to appear in the link on the server in a separate PHP script (no output buffering necessary) and then have your code inject the result of that call into the page the way you're trying to do in your click handler now.