What's the best way to set cursor/caret positi

问题:

If I'm inserting content into a textarea that TinyMCE has co-opted, what's the best way to set the position of the cursor/caret?

I'm using tinyMCE.execCommand("mceInsertRawHTML", false, content); to insert the content, and I'd like set the cursor position to the end of the content.

Both document.selection and myField.selectionStart won't work for this, and I feel as though this is going to be supported by TinyMCE (through something I can't find on their forum) or it's going to be a really ugly hack.

Later: It gets better; I just figured out that, when you load TinyMCE in WordPress, it loads the entire editor in an embedded iframe.

Later (2): I can use document.getElementById('content_ifr').contentDocument.getSelection(); to get the selection as a string, but not a Selection Object that I can use getRangeAt(0) on. Making progress little by little.

回答1:

First what you should do is add a span at the end of the content you want to create.

var ed = tinyMCE.activeEditor;

//add an empty span with a unique id
var endId = tinymce.DOM.uniqueId();
ed.dom.add(ed.getBody(), 'span', {'id': endId}, '');

//select that span
var newNode = ed.dom.select('span#' + endId);
ed.selection.select(newNode[0]);

This is a strategy used by the TinyMCE developers themselves in writing Selection.js. Reading the underlying source can be massively helpful for this kind of problem.

回答2:

After spending over 15 hours on this issue (dedication, I know), I found a partial solution that works in FF and Safari, but not in IE. For the moment, this is good enough for me although I might continue working on it in the future.

The solution: When inserting HTML at the current caret position, the best function to use is:

tinyMCE.activeEditor.selection.setContent(htmlcontent);

In Firefox and Safari, this function will insert the content at the current caret position within the iframe that WordPress uses as a TinyMCE editor. The issue with IE 7 and 8 is that the function seems to add the content to the top of the page, not the iframe (i.e. it completely misses the text editor). To address this issue, I added a conditional statement based on this code that will use this function instead for IE:

tinyMCE.activeEditor.execCommand("mceInsertRawHTML", false, htmlcontent);

The issue for this second function, however, is that the caret position is set to the beginning of the post area after it has been called (with no hope of recalling it based on the browser range, etc.). Somewhere near the end I discovered that this function works to restore the caret position at the end of the inserted content with the first function:

tinyMCE.activeEditor.focus();

In addition, it restores the caret position to the end of the inserted content without having to calculate the length of the inserted text. The downside is that it only works with the first insertion function which seems to cause problems in IE 7 and IE 8 (which might be more of a WordPress fault than TinyMCE).

A wordy answer, I know. Feel free to ask questions for clarification.

回答3:

It is so simple to move the cursor to the end that I can't believe the awful kludges that have been posted elsewhere online to do this. Mr. Spocke's answer wasn't initially helpful but in the end the API docs provided me with the answer. "Select all content and then collapse the selection":

ed.selection.select(ed.getBody(), true); // ed is the editor instance

ed.selection.collapse(false);

I hope this helps someone else as this thread is one of the first to come up in Google.

回答4:

The best way that I have found is to insert the content with a temp id and then give that focus using some trickery I found in the advlink plugin.

Hope this helps.

            var ed = tinyMCE.activeEditor;

            ed.execCommand('mceInsertContent', false, '<a id="_mce_temp_rob" href="http://robubu.com">robubu.com</a>');

            //horrible hack to put the cursor in the right spot
            ed.focus(); //give the editor focus
            ed.selection.select(ed.dom.select('#_mce_temp_rob')[0]); //select the inserted element
            ed.selection.collapse(0); //collapses the selection to the end of the range, so the cursor is after the inserted element
            ed.dom.setAttrib('_mce_temp_rob', 'id', ''); //remove the temp id

If you're doing this from a popup I think you also need to add

        tinyMCEPopup.storeSelection();

before closing the popup.

For anyone trying to insert content from a Wordpress custom meta box into the TinyMCE editor, this is the solution that works. I tried a ton of other scripts, including another on this page, the answer above by Gary Tan, which worked for me when installing custom TinyMCE buttons but didnt work out in this scenario.

回答5:

The correct solution is to use the tinyMCE api tinymce.dom.Selection

http://www.tinymce.com/wiki.php/API3:class.tinymce.dom.Selection

the syntaxe is something like :

var rng = tinymce.DOM.createRng();  // the range obj
var newNode = editor.dom.select(...    // find the correct selector so that newNode is the element of your editor text
rng.setStart(newNode.firstChild, 0); // 0 is the offset : here it will be at the beginning of the line.
rng.setEnd(newNode.firstChild, 0);
editor.selection.setRng(rng);

it works I use this myself.

回答6:

Insert a DOM node at the current selection/caret location.

tinyMCE.activeEditor.selection.setNode(tinyMCE.activeEditor.dom.create('img', {src : 'some.gif', title : 'some title'}));

回答7:

Just throwing in my own 2 cents here. None of these answered my question. I was not putting in an HTML element, but a block of text ([code][/code] for example) and needed the cursor to go between the two.

Using part of @robyates answer, what I did was put a temporary HTML element in between the 2 [code] tags, focus on it, then removed the HTML element completely. Here is my code:

setup : function(ed) {
    // Add a custom button
    ed.addButton('codeblock', {
        title : 'Code Block',
        text : '[code/]',
        icon: false,
        onclick : function() {
            // Add you own code to execute something on click
            ed.focus();
            //ed.selection.setContent('[code][/code]');
            ed.execCommand('mceInsertContent', false, '[code]<span id="_cursor" />[/code]');

            ed.selection.select(ed.dom.select('#_cursor')[0]); //select the inserted element
            ed.selection.collapse(0); //collapses the selection to the end of the range, so the cursor is after the inserted element
            ed.dom.remove('_cursor'); //remove the element
        }
    });
}

回答8:

I've plagiarized this from here.

function setCaretTo(obj, pos) { 
    if(obj.createTextRange) { 
        /* Create a TextRange, set the internal pointer to
           a specified position and show the cursor at this
           position
        */ 
        var range = obj.createTextRange(); 
        range.move("character", pos); 
        range.select(); 
    } else if(obj.selectionStart) { 
        /* Gecko is a little bit shorter on that. Simply
           focus the element and set the selection to a
           specified position
        */ 
        obj.focus(); 
        obj.setSelectionRange(pos, pos); 
    } 
} 

回答9:

So, here is solution from the our project. Our objective was to change (+)/(-)/(?) strings to the appropriate images "on the fly" while user is typing.

There was a problem: every time after changing string to image, cursor went the beginning of the image, not to the end as was expected.

We added bulk of the code which moves cursor to the end of the image, so user can type continuously w/o interrupting on "jumpy" cursor.

Key part: Instead of using editor.getBody, there is a more elegant way to create the temporary span and furthermore, delete it immediately after the necessary actions.

if (value.match(/\([+?-]\)/)) {
        // set current cursor via span
        editor.selection.setContent('<span id="temp-span"/>');

        // refresh Content with new span
        value = editor.getContent();

        // changing (+)/(-)/(?) to the appropriate image "on the fly"
        value = value.replace('(+)', ' <img src="https://url_here/static/task_manager/img/add.png">&nbsp;');
        value = value.replace('(-)', ' <img src="https://url_here/static/task_manager/img/forbidden.png">&nbsp;');
        value = value.replace('(?)', ' <img src="https://url_here/static/task_manager/img/help_16.png">&nbsp;');
        if (this.state.editor) {
            editor.setContent(value);

            // move cursor to the latter span
            var newNode = editor.dom.select('span#temp-span');
            editor.selection.select(newNode[0]);
            editor.selection.setContent('');
        }
        // and refreshing content again w/o span
        value = editor.getContent();
    }

回答10:

This is the solution that works for me:

// params: 
//   $node: jquery node with tinymce loaded 
//   text: text to set at then before caret
function setTextAndCaretToEnd($node, text) {
     var ed = window.tinyMCE.get($node.attr("id"));
     ed.focus();
     ed.selection.setContent(text);
}