118 lines
3.6 KiB
HTML
118 lines
3.6 KiB
HTML
|
<!DOCTYPE html>
|
||
|
<html>
|
||
|
<head>
|
||
|
<title>Dynamic Preview of Textarea with MathJax Content</title>
|
||
|
<!-- Copyright (c) 2012-2013 The MathJax Consortium -->
|
||
|
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
|
||
|
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
|
||
|
|
||
|
<script type="text/x-mathjax-config">
|
||
|
MathJax.Hub.Config({
|
||
|
showProcessingMessages: false,
|
||
|
tex2jax: { inlineMath: [['$','$'],['\\(','\\)']] }
|
||
|
});
|
||
|
</script>
|
||
|
<script type="text/javascript" src="../MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>
|
||
|
|
||
|
<script>
|
||
|
var Preview = {
|
||
|
delay: 150, // delay after keystroke before updating
|
||
|
|
||
|
preview: null, // filled in by Init below
|
||
|
buffer: null, // filled in by Init below
|
||
|
|
||
|
timeout: null, // store setTimout id
|
||
|
mjRunning: false, // true when MathJax is processing
|
||
|
oldText: null, // used to check if an update is needed
|
||
|
|
||
|
//
|
||
|
// Get the preview and buffer DIV's
|
||
|
//
|
||
|
Init: function () {
|
||
|
this.preview = document.getElementById("MathPreview");
|
||
|
this.buffer = document.getElementById("MathBuffer");
|
||
|
},
|
||
|
|
||
|
//
|
||
|
// Switch the buffer and preview, and display the right one.
|
||
|
// (We use visibility:hidden rather than display:none since
|
||
|
// the results of running MathJax are more accurate that way.)
|
||
|
//
|
||
|
SwapBuffers: function () {
|
||
|
var buffer = this.preview, preview = this.buffer;
|
||
|
this.buffer = buffer; this.preview = preview;
|
||
|
buffer.style.visibility = "hidden"; buffer.style.position = "absolute";
|
||
|
preview.style.position = ""; preview.style.visibility = "";
|
||
|
},
|
||
|
|
||
|
//
|
||
|
// This gets called when a key is pressed in the textarea.
|
||
|
// We check if there is already a pending update and clear it if so.
|
||
|
// Then set up an update to occur after a small delay (so if more keys
|
||
|
// are pressed, the update won't occur until after there has been
|
||
|
// a pause in the typing).
|
||
|
// The callback function is set up below, after the Preview object is set up.
|
||
|
//
|
||
|
Update: function () {
|
||
|
if (this.timeout) {clearTimeout(this.timeout)}
|
||
|
this.timeout = setTimeout(this.callback,this.delay);
|
||
|
},
|
||
|
|
||
|
//
|
||
|
// Creates the preview and runs MathJax on it.
|
||
|
// If MathJax is already trying to render the code, return
|
||
|
// If the text hasn't changed, return
|
||
|
// Otherwise, indicate that MathJax is running, and start the
|
||
|
// typesetting. After it is done, call PreviewDone.
|
||
|
//
|
||
|
CreatePreview: function () {
|
||
|
Preview.timeout = null;
|
||
|
if (this.mjRunning) return;
|
||
|
var text = document.getElementById("MathInput").value;
|
||
|
if (text === this.oldtext) return;
|
||
|
this.buffer.innerHTML = this.oldtext = text;
|
||
|
this.mjRunning = true;
|
||
|
MathJax.Hub.Queue(
|
||
|
["Typeset",MathJax.Hub,this.buffer],
|
||
|
["PreviewDone",this]
|
||
|
);
|
||
|
},
|
||
|
|
||
|
//
|
||
|
// Indicate that MathJax is no longer running,
|
||
|
// and swap the buffers to show the results.
|
||
|
//
|
||
|
PreviewDone: function () {
|
||
|
this.mjRunning = false;
|
||
|
this.SwapBuffers();
|
||
|
}
|
||
|
|
||
|
};
|
||
|
|
||
|
//
|
||
|
// Cache a callback to the CreatePreview action
|
||
|
//
|
||
|
Preview.callback = MathJax.Callback(["CreatePreview",Preview]);
|
||
|
Preview.callback.autoReset = true; // make sure it can run more than once
|
||
|
|
||
|
</script>
|
||
|
</head>
|
||
|
<body>
|
||
|
|
||
|
Type text in the box below:<br/>
|
||
|
|
||
|
<textarea id="MathInput" cols="60" rows="10" onkeyup="Preview.Update()" style="margin-top:5px">
|
||
|
</textarea>
|
||
|
<br/><br/>
|
||
|
Preview is shown here:
|
||
|
<div id="MathPreview" style="border:1px solid; padding: 3px; width:50%; margin-top:5px"></div>
|
||
|
<div id="MathBuffer" style="border:1px solid; padding: 3px; width:50%; margin-top:5px;
|
||
|
visibility:hidden; position:absolute; top:0; left: 0"><div>
|
||
|
|
||
|
<script>
|
||
|
Preview.Init();
|
||
|
</script>
|
||
|
|
||
|
</body>
|
||
|
</html>
|