I'm building a code playground using Code Mirror. My issue is that I'm not able to get the content from the textarea elements I have for html, css, and js. I created a textarea aside from those textarea elements to see if my code for getting the content from a textarea had issues. So in my html, of course I have the textarea tags. I gave this new textarea a class name "txtb" and I created a link with an onclick attribute for a function called "AlertContent()". Here is the javascript for the function:
function AlertContent(){
alert(document.getElementsByClassName('txtb')[0].value);
}
and guess what, it works. When I type into the textarea element that has the class "txtb", and click the link which calls the function AlertContent() I created, I see a message box appear displaying the text I typed into that textarea. It works. However, when I try to give classes to the textarea elements I'm using with Code Mirror, and use the same function to get the value or content from those textarea elements, I end up getting a blank message box even though there's text (html, css, js) in those textarea elements. All I want to do, is create a function that will get the content of the textarea elements (html, css, js) so then I can save it to my database. I would really appreciate the help. Here's the code I'm using for Code Mirror.
<!-- Code Editors -->
<section id="code_editors">
<div id="html" class="code_box">
<h3>HTML</h3>
<form><textarea class="MyHtml" name="htmlcode"></textarea></form>
</div>
<div id="css" class="code_box">
<h3>CSS</h3>
<textarea class="MyCss" name="css"></textarea>
</div>
<div id="js" class="code_box">
<h3>JavaScript</h3>
<textarea class="MyJs" name="js"></textarea>
</div>
</section>
</div>
<script src="http://codemirror.net/lib/codemirror.js"></script>
<!-- For HTML/XML -->
<script src="http://codemirror.net/mode/xml/xml.js"></script>
<script src="http://codemirror.net/mode/htmlmixed/htmlmixed.js"></script>
<!-- For CSS -->
<script src="http://codemirror.net/mode/css/css.js"></script>
<!-- For JS -->
<script src="http://codemirror.net/mode/javascript/javascript.js"></script>
</div>
</div>
<script>
(function() {
// Base template
var base_tpl =
"<!doctype html>\n" +
"<html>\n\t" +
"<head>\n\t\t" +
"<meta charset=\"utf-8\">\n\t\t" +
"<title>Test</title>\n\n\t\t\n\t" +
"</head>\n\t" +
"<body>\n\t\n\t" +
"</body>\n" +
"</html>";
var prepareSource = function() {
var html = html_editor.getValue(),
css = css_editor.getValue(),
js = js_editor.getValue(),
src = '';
// HTML
src = base_tpl.replace('</body>', html + '</body>');
// CSS
css = '<style>' + css + '</style>';
src = src.replace('</head>', css + '</head>');
// Javascript
js = '<script>' + js + '<\/script>';
src = src.replace('</body>', js + '</body>');
return src;
};
var render = function() {
var source = prepareSource();
var iframe = document.querySelector('#output iframe'),
iframe_doc = iframe.contentDocument;
iframe_doc.open();
iframe_doc.write(source);
iframe_doc.close();
};
// EDITORS
// CM OPTIONS
var cm_opt = {
mode: 'text/html',
gutter: true,
lineNumbers: true,
};
// HTML EDITOR
var html_box = document.querySelector('#html textarea');
var html_editor = CodeMirror.fromTextArea(html_box, cm_opt);
html_editor.on('change', function (inst, changes) {
render();
});
// CSS EDITOR
cm_opt.mode = 'css';
var css_box = document.querySelector('#css textarea');
var css_editor = CodeMirror.fromTextArea(css_box, cm_opt);
css_editor.on('change', function (inst, changes) {
render();
});
// JAVASCRIPT EDITOR
cm_opt.mode = 'javascript';
var js_box = document.querySelector('#js textarea');
var js_editor = CodeMirror.fromTextArea(js_box, cm_opt);
js_editor.on('change', function (inst, changes) {
render();
});
// SETTING CODE EDITORS INITIAL CONTENT
html_editor.setValue('<p>Empty Room</p>');
css_editor.setValue('body { color: gray; }');
// RENDER CALL ON PAGE LOAD
// NOT NEEDED ANYMORE, SINCE WE RELY
// ON CODEMIRROR'S onChange OPTION THAT GETS
// TRIGGERED ON setValue
// render();
// NOT SO IMPORTANT - IF YOU NEED TO DO THIS
// THEN THIS SHOULD GO TO CSS
/*
Fixing the Height of CodeMirror.
You might want to do this in CSS instead
of JS and override the styles from the main
codemirror.css
*/
var cms = document.querySelectorAll('.CodeMirror');
for (var i = 0; i < cms.length; i++) {
cms[i].style.position = 'absolute';
cms[i].style.top = '30px';
cms[i].style.bottom = '0';
cms[i].style.left = '0';
cms[i].style.right = '0';
cms[i].style.height = '100%';
}
/*cms = document.querySelectorAll('.CodeMirror-scroll');
for (i = 0; i < cms.length; i++) {
cms[i].style.height = '100%';
}*/
}());
// Basically adding to the CM Options
cm_opt['extraKeys'] = {
Tab: function(instance) {
if (inst.somethingSelected())
CodeMirror.commands.indentMore(inst);
else
CodeMirror.commands.insertTab(inst);
}
}
</script>
Why don't you use the get_value() that is provided on the editors? For example, html_editor.getValue()
Here is an example page doing just that to alert what you write in the CodeMirror textarea when you click the respective editor's button.
<!DOCTYPE html>
<html>
<head>
<title>CodeMirror</title>
<link rel="stylesheet" href="http://codemirror.net/lib/codemirror.css">
</head>
<body>
<!-- Code Editors -->
<section id="code_editors">
<div id="html" class="code_box">
<h3>HTML</h3>
<form><textarea class="MyHtml" name="htmlcode"></textarea></form>
<button onclick="viewHTML()">Alert this HTML</button>
</div>
<div id="css" class="code_box">
<h3>CSS</h3>
<textarea class="MyCss" name="css"></textarea>
<button onclick="viewCSS()">Alert this CSS</button>
</div>
<div id="js" class="code_box">
<h3>JavaScript</h3>
<textarea class="MyJs" name="js"></textarea>
<button onclick="viewJS()">Alert this JS</button>
</div>
</section>
<div id="output">
<iframe></iframe>
</div>
<script src="http://codemirror.net/lib/codemirror.js"></script>
<!-- For HTML/XML -->
<script src="http://codemirror.net/mode/xml/xml.js"></script>
<script src="http://codemirror.net/mode/htmlmixed/htmlmixed.js"></script>
<!-- For CSS -->
<script src="http://codemirror.net/mode/css/css.js"></script>
<!-- For JS -->
<script src="http://codemirror.net/mode/javascript/javascript.js"></script>
<script>
(function() {
// Base template
var base_tpl =
"<!doctype html>\n" +
"<html>\n\t" +
"<head>\n\t\t" +
"<meta charset=\"utf-8\">\n\t\t" +
"<title>Test</title>\n\n\t\t\n\t" +
"</head>\n\t" +
"<body>\n\t\n\t" +
"</body>\n" +
"</html>";
window.viewHTML = function() {
alert(html_editor.getValue());
}
window.viewCSS = function() {
alert(css_editor.getValue());
}
window.viewJS = function() {
alert(js_editor.getValue());
}
var prepareSource = function() {
var html = html_editor.getValue(),
css = css_editor.getValue(),
js = js_editor.getValue(),
src = '';
// HTML
src = base_tpl.replace('</body>', html + '</body>');
// CSS
css = '<style>' + css + '</style>';
src = src.replace('</head>', css + '</head>');
// Javascript
js = '<script>' + js + '<\/script>';
src = src.replace('</body>', js + '</body>');
return src;
};
var render = function() {
var source = prepareSource();
var iframe = document.querySelector('#output iframe'),
iframe_doc = iframe.contentDocument;
iframe_doc.open();
iframe_doc.write(source);
iframe_doc.close();
};
// EDITORS
// CM OPTIONS
var cm_opt = {
mode: 'text/html',
gutter: true,
lineNumbers: true,
};
// HTML EDITOR
var html_box = document.querySelector('#html textarea');
var html_editor = CodeMirror.fromTextArea(html_box, cm_opt);
html_editor.on('change', function (inst, changes) {
render();
});
// CSS EDITOR
cm_opt.mode = 'css';
var css_box = document.querySelector('#css textarea');
var css_editor = CodeMirror.fromTextArea(css_box, cm_opt);
css_editor.on('change', function (inst, changes) {
render();
});
// JAVASCRIPT EDITOR
cm_opt.mode = 'javascript';
var js_box = document.querySelector('#js textarea');
var js_editor = CodeMirror.fromTextArea(js_box, cm_opt);
js_editor.on('change', function (inst, changes) {
render();
});
// SETTING CODE EDITORS INITIAL CONTENT
html_editor.setValue('<p>Empty Room</p>');
css_editor.setValue('body { color: gray; }');
js_editor.setValue('var x = \'10\';');
// RENDER CALL ON PAGE LOAD
// NOT NEEDED ANYMORE, SINCE WE RELY
// ON CODEMIRROR'S onChange OPTION THAT GETS
// TRIGGERED ON setValue
// render();
// NOT SO IMPORTANT - IF YOU NEED TO DO THIS
// THEN THIS SHOULD GO TO CSS
/*
Fixing the Height of CodeMirror.
You might want to do this in CSS instead
of JS and override the styles from the main
codemirror.css
*/
/*
var cms = document.querySelectorAll('.CodeMirror');
for (var i = 0; i < cms.length; i++) {
cms[i].style.position = 'absolute';
cms[i].style.top = '30px';
cms[i].style.bottom = '0';
cms[i].style.left = '0';
cms[i].style.right = '0';
cms[i].style.height = '100%';
}
*/
/*cms = document.querySelectorAll('.CodeMirror-scroll');
for (i = 0; i < cms.length; i++) {
cms[i].style.height = '100%';
}*/
// Basically adding to the CM Options
cm_opt['extraKeys'] = {
Tab: function(instance) {
if (inst.somethingSelected())
CodeMirror.commands.indentMore(inst);
else
CodeMirror.commands.insertTab(inst);
}
}
}());
</script>
</body>
</html>