Insert tags around selected text
I've had a look around but the other answers don't really help me out.
I want to create a small WYSIWYG editor, there only needs to be the options to add links and add lists. My question is how do I append t开发者_StackOverflow社区ags around selected text in a textarea when one of the links/button (e.g. "Add Link") is clicked?
I've written a jQuery plug-in that does this (and which I really must document), which you can download from http://code.google.com/p/rangyinputs/downloads/list.
The following will work in all major browsers and surrounds the selected text, and restores the selection to contain the previously selected text:
var url = "https://stackoverflow.com/";
$("#yourTextAreaId").surroundSelectedText('<a href="' + url + '">', '</a>');
For a solution without jQuery, you could use the getInputSelection()
and setInputSelection()
functions from this answer for compatibility with IE <= 8 as follows:
function getInputSelection(el) {
var start = 0, end = 0, normalizedValue, range,
textInputRange, len, endRange;
if (typeof el.selectionStart == "number" && typeof el.selectionEnd == "number") {
start = el.selectionStart;
end = el.selectionEnd;
} else {
range = document.selection.createRange();
if (range && range.parentElement() == el) {
len = el.value.length;
normalizedValue = el.value.replace(/\r\n/g, "\n");
// Create a working TextRange that lives only in the input
textInputRange = el.createTextRange();
textInputRange.moveToBookmark(range.getBookmark());
// Check if the start and end of the selection are at the very end
// of the input, since moveStart/moveEnd doesn't return what we want
// in those cases
endRange = el.createTextRange();
endRange.collapse(false);
if (textInputRange.compareEndPoints("StartToEnd", endRange) > -1) {
start = end = len;
} else {
start = -textInputRange.moveStart("character", -len);
start += normalizedValue.slice(0, start).split("\n").length - 1;
if (textInputRange.compareEndPoints("EndToEnd", endRange) > -1) {
end = len;
} else {
end = -textInputRange.moveEnd("character", -len);
end += normalizedValue.slice(0, end).split("\n").length - 1;
}
}
}
}
return {
start: start,
end: end
};
}
function offsetToRangeCharacterMove(el, offset) {
return offset - (el.value.slice(0, offset).split("\r\n").length - 1);
}
function setInputSelection(el, startOffset, endOffset) {
if (typeof el.selectionStart == "number" && typeof el.selectionEnd == "number") {
el.selectionStart = startOffset;
el.selectionEnd = endOffset;
} else {
var range = el.createTextRange();
var startCharMove = offsetToRangeCharacterMove(el, startOffset);
range.collapse(true);
if (startOffset == endOffset) {
range.move("character", startCharMove);
} else {
range.moveEnd("character", offsetToRangeCharacterMove(el, endOffset));
range.moveStart("character", startCharMove);
}
range.select();
}
}
function surroundSelectedText(el, before, after) {
var val = el.value;
var sel = getInputSelection(el);
el.value = val.slice(0, sel.start) +
before +
val.slice(sel.start, sel.end) +
after +
val.slice(sel.end);
var newCaretPosition = sel.end + before.length + after.length;
setInputSelection(el, newCaretPosition, newCaretPosition);
}
function surroundWithLink() {
surroundSelectedText(
document.getElementById("ta"),
'<a href="https://stackoverflow.com/">',
'</a>'
);
}
<input type="button" onmousedown="surroundWithLink(); return false" value="Surround">
<br>
<textarea id="ta" rows="5" cols="50">Select some text in here and press the button</textarea>
If you don't need support for IE <= 8, you can replace the getInputSelection()
and setInputSelection()
functions with the following:
function getInputSelection(el) {
return {
start: el.selectionStart,
end: el.selectionEnd
};
}
function setInputSelection(el, start, end) {
el.setSelectionRange(start, end);
}
You can use a function like the following:
function addUrl(url) {
var textArea = $('#myTextArea');
var start = textArea[0].selectionStart;
var end = textArea[0].selectionEnd;
var replacement = '<a href="'+url+'">' + textArea.val().substring(start, end) + '</a>';
textArea.val(textArea.val().substring(0, start) + replacement + textArea.val().substring(end, textArea.val().length));
}
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