我正在使用PHP从MySQL数据库中检索有关“资源”的信息。关于每个资源的信息是作为HTML输出像下面这样的格式:在同一页面上的多个相似的窗体
Title
Description
Etc.
然后每个资源都有一个“编辑”链接,运行的JavaScript的onclick。该JS插入一个包含所选资源信息的表单,以便在数据库中进行编辑和更新。如果JavaScript被禁用,用户将被带到一个单独的页面,该页面只有编辑该特定资源的表单。所以,我的问题是:如何在同一页面上管理任意数量的表单,这些表单都具有相同的功能,仅适用于MySQL数据库的不同行(不同的“资源”)?特别是,我将如何确定要在JavaScript插入的表单中编辑的特定资源?
现在我正在使用一个隐藏的输入来携带资源ID(erid),但PHP脚本看起来像什么实际上处理表单动作?出现这个问题的原因是因为输入类型的每个名称=“提交”当前都携带了erid,例如, NAME = “UPDATE1”,名字= “UPDATE2” 等
从数据库中获取资源:
require('inc/db_connect_info.config');
$mysqli = new mysqli($host, $mysqlilogin, $mysqlipassword, $databaseName);
if (mysqli_connect_error()) {
die("Can't connect to database: " . mysqli_connect_error());
}
else{
$testQuery = "SELECT * FROM eresources NATURAL JOIN subjects";
$testResult = $mysqli->query($testQuery);
if($testResult && $testResult->num_rows >= 1) {
while($testArray = $testResult->fetch_assoc()) {
$testArray['stitle'] = htmlentities($testArray['stitle']);
// START er div
print("<div id=\"er".$testArray['erid']."\" class=\"grey\">"); print("\n\n\t");
// erid, link, title, descr
print("<p>".$testArray['erid'].": <a id=\"link".$testArray['erid']."\" href=\"".$testArray['link']."\">".$testArray['ertitle']."</a> - <span id=\"descr".$testArray['erid']."\">".$testArray['descr']."</span></p>");
print("\n\t");
// edit "link"
print("<a href=\"edit.php?erid=".$testArray['erid']."\" onclick=\"return showEdit(".$testArray['erid'].")\">Edit</a>");
print(" ");
// END er div
print("</div>");
print("\n\n");
}
}
// If there was a problem retrieving resources, print an error message //
else{
print("<p>No e-resources found!</p>");
}
$mysqli->close();
}
JavaScript函数网页上插入更新的形式在那里,如果 “编辑” 链接被点击 (假设启用JavaScript):
function showEdit(erid) {
//get page url for form submission
var url = document.location.href;
//current title
var erTitle = document.getElementById("link" + erid).innerHTML;
//current link
var erLink = document.getElementById("link" + erid).getAttribute("href");
//current description
var erDescr = document.getElementById("descr" + erid).innerHTML;
//current subject under which electronic resource is filed
var erSubject = document.getElementById("subject" + erid).innerHTML;
//clear the er div
document.getElementById("er" + erid).innerHTML = "";
//then fill it with a form for new values, to be submitted to the same page
//the form is prepopulated with the current values from the database
document.getElementById("er" + erid).innerHTML =
"<form action=\"" + url + "\" method=\"post\">" +
"Title<br /><input type=\"text\" name=\"updated_er_title"+erid+"\" value=\"" + erTitle + "\" size=\"100\" /><br /><br />" +
"Link<br /><input type=\"text\" name=\"updated_er_link"+erid+"\" value=\"" + erLink + "\" size=\"100\" /><br /><br />" +
"Description<br /><textarea name=\"updated_er_descr"+erid+"\" cols=\"75\" rows=\"10\">" + erDescr + "</textarea><br /><br />" +
"Free Status<br />" + erFree + "<br /><br />" +
"Subject<br /><input type=\"text\" name=\"updated_er_subject"+erid+"\" value=\"" + erSubject + "\" size=\"100\" /><br /><br />" +
"<input type=\"hidden\" name=\"erid\" value=\""+erid+"\" />" +
"<input type=\"submit\" name=\"update" + erid + "\" value=\"Update\" />" +
"</form>";
// return false so the link is not followed if javascript is enabled
// if javascript is disabled, link provides same form on separate page
return false;
}