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How to automatic resize tinyMCE?

Posted by: admin November 30, 2017 Leave a comment


I have a TinyMCE that is set over a TextArea, and I want this editor area to ocuppy all the space of its parent div, all times.

I have a JS function that get the current space and set the textarea.style.height to it, but when I enables TinyMCE it seems to stop working.

Also, the textarea has width: 100%; it doesn’t resize by HTML rendering when it’s using TinyMCE too.

Any ideas?


Nowadays, you should use the autoresize plugin that comes with tinyMCE. You will have to call tinyMCE like this (jQuery version):

  theme : 'advanced',
  plugins : 'autoresize',
  width: '100%',
  height: 400,
  autoresize_min_height: 400,
  autoresize_max_height: 800,

I made the experience, that it may be helpful to manually call the resizing in the init_instance_callback to provide the correct height on init. Add this parameter to the passed options, if you need this:

init_instance_callback: function (inst) { inst.execCommand('mceAutoResize'); }


The point is that TinyMCE generates an iframe in the place of the textarea, with this ID: originalID+”_ifr”, and a table originalID+”_tbl” for holding the controls and the editor area.

To make fluid width:


To make fluid height:

Change dinamically document.getElementById(id+'_ifr').style.height to the height you want, through JS.
This is the script I’m using for this:

function toScreenHeight(id, minus) {
    var height;

    if (typeof(window.innerHeight) == "number") //non-IE
        height = window.innerHeight;
    else if (document.documentElement && document.documentElement.clientHeight) //IE 6+ strict mode
        height = document.documentElement.clientHeight;
    else if (document.body && document.body.clientHeight) //IE 4 compatible / IE quirks mode
        height = document.body.clientHeight;

    document.getElementById(id).style.height = (height - minus) + "px";

You can use the code and function calls inside onload and onresize body events.


in tinymce 3.4.6,


in init option will solve the problem.


If you’re doing tiny MCE dynamically via JS, you can run into timing issues where the MCE editor is not yet available for style adjustments. To combat this, you can use an old school timeout.

In this example, I’m using a “j” namespace for JQuery. If your editor is in a fluid div that changes size, you may want include this in a $(window).resize(function() { }); listener.

  $j('#'+[INSERT TEXTAREA ID HERE]+'_ifr').css('width','100%').css('minHeight','240px');


None of the above were working for me in TinyMCE v4, so my solution was to calculate the height based on the toolbars/menu bar/status bar, and then set the height of the editor, taking those heights into consideration.

function resizeEditor(myHeight) {
    myEditor = getEditor();
    if (myEditor) {
        try {
            if (!myHeight) {            
                var targetHeight = window.innerHeight; // Change this to the height of your wrapper element
                var mce_bars_height = 0;
                $('.mce-toolbar, .mce-statusbar, .mce-menubar').each(function(){
                    mce_bars_height += $(this).height();
                window.console.log('mce bars height total: '+mce_bars_height);                          
                myHeight = targetHeight - mce_bars_height - 8;  // the extra 8 is for margin added between the toolbars
            window.console.log('resizeEditor: ', myHeight);
            myEditor.theme.resizeTo('100%', myHeight);  // sets the dimensions of the editable area
        catch (err) {

In my case, I wanted the editor window to match the width and height of the actual window, since the editor would come up in a popup. To detect changes and resize, I set this to a callback:

window.onresize = function() {


With version 4 and the option to use flexbox layout in the browser I did the following to get a full width,height editing experience of the parent div.

It should be easy to put the css into a file if you prefer adding it to your existing styles.

var css = '.tinycme-full .mce-edit-area {display:flex;flex-flow:column;} .tinycme-full .mce-edit-area iframe {flex:1 1 auto;}  .tinycme-full {height:100%;} .tinycme-full .mce-tinymce.mce-container { width:100%;height:100%;border:0; } .tinycme-full .mce-panel{border:0} .tinycme-full .mce-container-body.mce-stack-layout {display: flex; flex-flow: column;height: 100%;} .tinycme-full .mce-stack-layout-item{  flex: 0 0 auto;} .tinycme-full .mce-edit-area{flex:1 1 auto;} ',
    head = document.head || document.getElementsByTagName('head')[0],
    style = document.createElement('style');

style.type = 'text/css';
if (style.styleSheet) {
    style.styleSheet["cssText"] = css;
} else {


The idea is that it make all the needed divs take up as much column space as needed to fill the parent 100% and its done by putting a div around your textarea: <div class="tinycme-full"> <textarea ... /></div>

No jquery or other dependencies are needed andd it now fills the parent 100%.
enter image description here


I had the same problem, after reading this thread I ended up with this code

init_instance_callback: function (inst) { 
  setTimeout(function () {
    document.getElementById(inst.id + '_ifr').style.height= (document.getElementById("theContainerDiv").offsetHeight-85) + 'px';

I resize the “_ifm” element instead of the “_tbl”, since resizing the “_tbl” didn’t resize the edit area for me. Then I leave some space for the toolbar and statusbar by making the “_ifr” 85 pixels shorter then the container div.

I had to use setTimeout to make it work, maybe because I have an animation that displays the container element.


SyCoDeR is right but I followed a slightly different path though probably with the same results.

/*Container, container body, iframe*/
.mce-tinymce, .mce-container-body, #code_ifr {
    min-height: 100% !important;
/*Container body*/
.mce-container-body {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
/*Editing area*/
.mce-container-body .mce-edit-area {
    position: absolute;
    top: 69px;
    bottom: 37px;
    left: 0;
    right: 0;
.mce-tinymce .mce-statusbar {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;

Revised because TinyMCE changes the id’s with menu/toolbar additions or deletions. This works no matter what you do with it.


The wrapper of iframe (its ID finish by _ifr) is the first parent of span that it has application as role .
Thus, To get the wrapper :


So to Resize height:


To resize width



I’m using pure css solution to achieve this (tinyMCE 4.0.20).

  1. Set iframe height to 100%:

    height: ‘100%’

  2. Add styles to auto-resize iframe container:

    .mce-tinymce { height: auto; width: 100%; position: absolute; left: 0; top: 0; bottom: 0; }

    .bq-editor .mce-container-body { height: 100%; }

    .bq-editor .mce-edit-area { position: absolute; top: 57px; bottom: 0; width: 100%; height: auto; }

Note: I have one toolbar line, and top: 57px; in .bq-editor .mce-edit-area is toolbar padding.

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