Is there a way to map an event such as a click-event on this element
<div>Just normal text</div>
to the position in the contained text ( "You just clicked the 6th character", when hitting the 'n' )?
I don't know any pretty way of achieving that but I got a solution that would work, although it's ugly.
You could wrap each letter of your div text in a lets say span element and add unique identifiers for each letter. Then you'd hook up event handlers for those span elements, not the whole div and based on the span id you could tell which character was that.
This whole thing can be done in JS but as I said that's not the ideal solution for sure.
Here's the example (I've added a test id to the div so I could find it easier).
var letters = $('#test').text();
var spans = '';
for (var i = 0; i < letters.length; i++) {
spans += '<span id="id' + i + '">' + letters[i] + '<span>';
}
$('#test').html(spans);
$('span[id^=id]').click(function() {
alert('Clicked char: ' + (Number($(this).attr('id').substring(2)) + 1));
return false;
});
You can also give it a try on my demo.
Not as such; I guess you would have to split each character into a <span> element, either on server side or using JQuery.
Here's a hacky way that could possibly be made to work: it involves temporarily making the document editable and examining the selection. It should work in Firefox 3+, IE 6+, recent Safari and Chrome.
As it stands, there are some problems I can see:
The results in IE are different to other browsers: IE counts all characters in the whole containing element up until the caret while other browsers give an offset within the containing text node, but you could work round this;
A border appears round the current element in some browsers
Doesn't work in Opera or Firefox 2, and leaves document editable
Possibility of other UI glitches: it's a nasty hack.
Code:
window.onload = function() {
var mouseDownEl;
document.onmousedown = function(evt) {
evt = evt || window.event;
var el = evt.target || evt.srcElement;
if (evt.srcElement || !("contentEditable" in el)) {
document.designMode = "on";
} else {
el.contentEditable = "true";
}
mouseDownEl = el;
};
document.onclick = function(evt) {
evt = evt || window.event;
var el = evt.target || evt.srcElement;
if (el == mouseDownEl) {
window.setTimeout(function() {
var caretPos, range;
if (typeof window.getSelection != "undefined") {
caretPos = window.getSelection().focusOffset;
} else if (document.selection && document.selection.createRange) {
range = document.body.createTextRange();
range.moveToElementText(el);
range.collapse();
range.setEndPoint("EndToEnd", document.selection.createRange());
caretPos = range.text.length;
}
if (el.contentEditable == "true") {
el.contentEditable = "false";
} else {
document.designMode = "off";
}
alert(caretPos);
}, 1);
} else {
if (mouseDownEl.contentEditable == "true") {
mouseDownEl.contentEditable = "false";
} else {
document.designMode = "off";
}
}
mouseDownEl = null;
};
};
Related
I have spent an hour reading a million different posts and can't get a winner.
Simply put. I have created an on-screen keyboard.
When a user presses a letter button, the letter is inserted at the carat in the input that has focus.
This all works fine and I know how to insert all the letters and numbers and spaces but I can't figure out how to backspace at the carat. I know how to take the last character off but that is not effective as I wish it to backspace at the carat.
I will insert the code to show how it is set up... The only part that does not work is the lines in the if ($(this).html() == 'BKSP') block.
PLEASE and THANKS!
function insertAtCursor(myField, myValue) {
//IE support
if (document.selection) {
myField.focus();
sel = document.selection.createRange();
sel.text = myValue;
}
//MOZILLA and others
else if (myField.selectionStart || myField.selectionStart == '0') {
var startPos = myField.selectionStart;
var endPos = myField.selectionEnd;
myField.value = myField.value.substring(0, startPos)
+ myValue
+ myField.value.substring(endPos, myField.value.length);
myField.selectionStart = startPos + myValue.length;
myField.selectionEnd = startPos + myValue.length;
} else {
myField.value += myValue;
}
}
$("#keyboard").on("pointerdown", function(e){
e.preventDefault();
});
$(".sm-kb-btn").on("pointerdown", function (e) {
if ($(this).html() == 'BKSP') {
var e = new Event("keydown");
e.key = "Backspace";
e.code = "Backspace";
document.getElementById("search-box-input").dispatchEvent(e);
}
else {
insertAtCursor(document.getElementById("search-box-input"), $(this).html());
}
})
The browser and javascript have limits when it comes to accessing to device hardware, for sercurity reasons. You can throw a keydown event, but it won't perform the same action as physically pressing a key.
If you're goal is just maintaining the caret position, you can set that using selection.setSelectionRange(caret_position, caret_position)
https://developer.mozilla.org/en-US/docs/Web/API/Selection
Set keyboard caret position in html textbox
Here's a demo:
let output = document.querySelector('input');
document.querySelector('.buttons').addEventListener('click', function(e){
if (e.target.nodeName === 'BUTTON') {
let caret_position = output.selectionStart || 0, //current caret position
character = e.target.textContent, //button / key pressed
new_caret_position = Math.max(0, caret_position + (character === 'BKSP' ? -1 : 1));
//if BKSP, move caret -1, else move caret +1. also make sure it's >= 0
if (character === 'BKSP'){ //remove character preceding current caret position
output.value = output.value.substr(0, new_caret_position) + output.value.substr(caret_position);
} else { //insert character at current character position
output.value = output.value.substr(0, caret_position) + character + output.value.substr(caret_position);
}
//reset the caret position after modifying output.value
output.setSelectionRange(new_caret_position, new_caret_position);
}
});
button{
height: 24px;
margin: 16px 4px;
}
<input>
<div class="buttons">
<button>Q</button>
<button>W</button>
<button>E</button>
<button>R</button>
<button>T</button>
<button>Y</button>
<button>BKSP</button>
</div>
I want to intercept the keys typed in one input and change them to others.
For example, I want to simulate typing a 1 each time a key is pressed.
I was thinking to something like this :
//this example does not work, it will trigger an endless loop
Array.from(document.querySelectorAll('.onlyOne')).forEach(input =>
input.addEventListener('keydown', (event) => {
event.preventDefault();
event.srcElement.dispatchEvent(new KeyboardEvent('keydown', { 'key': 49 }));
});
}
);
I canot just add 1 whith event.target.value += 1;
cause when there is already text in the input and the cursor is not at the end of the text or the user has selected all text with the mouse , it would not act naturally if text is added at the end of input
Could you help me please?
By dispatching an event from within the event that causes the same event, you're creating an infinite loop that will cause a Range Error: Maximum call stack size exceeded.
Instead of the event, simply add a 1 to where the cursor is on each keydown.
Array.from(document.querySelectorAll('.onlyOne')).forEach(input =>
input.addEventListener('keydown', (event) => {
event.preventDefault();
event.target.insertAtCaret('1');
}));
HTMLInputElement.prototype.insertAtCaret = function (text) {
text = text || '';
if (document.selection) {
// IE
this.focus();
var sel = document.selection.createRange();
sel.text = text;
} else if (this.selectionStart || this.selectionStart === 0) {
// Others
var startPos = this.selectionStart;
var endPos = this.selectionEnd;
this.value = this.value.substring(0, startPos) +
text +
this.value.substring(endPos, this.value.length);
this.selectionStart = startPos + text.length;
this.selectionEnd = startPos + text.length;
} else {
this.value += text;
}
};
<input class='onlyOne' value="foo">
The HTMLInputElement.prototype.insertAtCaret is taken from this answer: https://stackoverflow.com/a/19961519/3993662
You can change that to a normal function if you don't want to extend the built in's prototype.
I am using a text editor provided by Microsoft ajax-toolkit.
It renders iframe on browser. I have added a dropdown in that editor and I want that when user changes the drop-down index the value should be added in the editor current cursor position.
I got a code on SO which gives me the current selected text inside editor is as follows
function getIframeSelectionText(iframe) {
var win = iframe.contentWindow;
var doc = iframe.contentDocument || win.document;
if (win.getSelection) {
return win.getSelection().toString();
} else if (doc.selection && doc.selection.createRange) {
return doc.selection.createRange().text;
}
}
But I want to add some text at the current position. The html is rendering as below
<td class="ajax__htmleditor_editor_editpanel"><div id="Editor1_ctl02" style="height:100%;width:100%;">
<iframe id="Editor1_ctl02_ctl00" name="Editor1_ctl02_ctl00" marginheight="0" marginwidth="0" frameborder="0" style="height:100%;width:100%;display:none;border-width:0px;">
</iframe><textarea id="Editor1_ctl02_ctl01" class="ajax__htmleditor_htmlpanel_default" style="height:100%;width:100%;display:none;"></textarea><iframe id="Editor1_ctl02_ctl02" name="Editor1_ctl02_ctl02" marginheight="0" marginwidth="0" frameborder="0" style="height:100%;width:100%;display:none;border-width:0px;">
</iframe>
</div></td>
I am trying as follow
$("#imgDropdown").change(function () {
//var iframeBody = $(window.Editor1_ctl02_ctl00.document.getElementsByTagName("body")[0]);
var iframe = document.getElementById("Editor1_ctl02_ctl00");
$("#Editor1_ctl02_ctl00").find("body").insertAtCaret("value");
//alert(getIframeSelectionText(iframe));
});
the function for inserting text is not working with iframe is as follow
$.fn.extend({
insertAtCaret: function (myValue) {
if (document.selection) {
this.focus();
sel = document.selection.createRange();
sel.text = myValue;
this.focus();
}
else if (this.selectionStart || this.selectionStart == '0') {
var startPos = this.selectionStart;
var endPos = this.selectionEnd;
var scrollTop = this.scrollTop;
this.value = this.value.substring(0, startPos) + myValue + this.value.substring(endPos, this.value.length);
this.focus();
this.selectionStart = startPos + myValue.length;
this.selectionEnd = startPos + myValue.length;
this.scrollTop = scrollTop;
} else {
this.value += myValue;
this.focus();
}
}
})
Easy, you just have to use.
$("#Editor1_ctl02_ctl00").contents().find('textarea').insertAtCaret('value');
Updated
Sorry, I thought the insertAtCaret function is working for you, you just needed to work inside iFrame. You can use this version of insertAtCaret:
jQuery.fn.extend({
insertAtCaret: function (html) {
var winObject = function (el){
var doc = el.ownerDocument;
return doc.defaultView || doc.parentWindow
};
return this.each(function (i) {
var sel, range, w = this;
w = winObject(w);
if (w.getSelection) {
// IE9 and non-IE
sel = w.getSelection();
if (sel.getRangeAt && sel.rangeCount) {
range = sel.getRangeAt(0);
range.deleteContents();
// Range.createContextualFragment() would be useful here but is
// only relatively recently standardized and is not supported in
// some browsers (IE9, for one)
var el = w.document.createElement("div");
el.innerHTML = html;
var frag = w.document.createDocumentFragment(), node, lastNode;
while ((node = el.firstChild)) {
lastNode = frag.appendChild(node);
}
range.insertNode(frag);
// Preserve the selection
if (lastNode) {
range = range.cloneRange();
range.setStartAfter(lastNode);
range.collapse(true);
sel.removeAllRanges();
sel.addRange(range);
}
}
} else if (w.document.selection && w.document.selection.type != "Control") {
// IE < 9
w.document.selection.createRange().pasteHTML(html);
}
}
)
}
});
and call it like:
$("#Editor1_ctl02_ctl00").contents().find('body').insertAtCaret($val);
Function adapted from here
Happy coding!
There seem to be a few issues here.
The Microsoft ajax-toolkit editor creates an iframe where the designMode property is turned on, and that's why it's editable, it has no value, and textNodes are added straight to the body, which makes it a little more difficult.
When you're selecting something from a dropdown, the focus is on the dropdown, and there is no caret position, as the focus is shifted away from the iFrame.
I'm assuming that the dropdown is in the top menubar for the editor or anywhere else that is outside the iFrame.
Also, the Microsoft ajax-toolkit editor has a recommended update, the HTMLEditorExtender.
The code you have to capture the caret position seems to be for a regular input / textarea, and you'd have to adapt that code to work with any Node inside an iframe that is in designMode, with it's own window and document etc.
Given the above considerations, this is what I came up with to do this
var frameID = 'Editor1_ctl02_ctl00',
selectID = 'imgDropdown',
iframe = document.getElementById(frameID),
iWin = iframe.contentWindow ? iframe.contentWindow : window.frames[frameID];
$(iWin).on('blur', function() {
$(iframe).data('range', getRange(iWin));
});
$('#' + selectID).on('change', function() {
var range = $(iframe).data('range');
addText(iWin, range, this.value);
});
function getRange(win) {
var sel, range, html;
if (win.getSelection) {
sel = win.getSelection();
if (sel.getRangeAt && sel.rangeCount) {
range = sel.getRangeAt(0);
range.deleteContents();
}
} else if (win.document.selection && win.document.selection.createRange) {
range = win.document.selection.createRange();
}
return range;
}
function addText(win, range, text) {
if (win.getSelection) {
range.insertNode(win.document.createTextNode(text));
} else if (win.document.selection && win.document.selection.createRange) {
range.text = text;
}
}
FIDDLE
A JavaScript function selects a certain word in a textarea using .setSelectionRange().
In Firefox, the textarea automatically scrolls down to show the selected text. In Chrome (v14), it does not. Is there a way to get Chrome to scroll the textarea down to the newly selected text?
jQuery solutions are welcome.
Here is a simple and efficient solution in pure JavaScript:
// Get the textarea
var textArea = document.getElementById('myTextArea');
// Define your selection
var selectionStart = 50;
var selectionEnd = 60;
textArea.setSelectionRange(selectionStart, selectionEnd);
// Mow let’s do some math.
// We need the number of characters in a row
var charsPerRow = textArea.cols;
// We need to know at which row our selection starts
var selectionRow = (selectionStart - (selectionStart % charsPerRow)) / charsPerRow;
// We need to scroll to this row but scrolls are in pixels,
// so we need to know a row's height, in pixels
var lineHeight = textArea.clientHeight / textArea.rows;
// Scroll!!
textArea.scrollTop = lineHeight * selectionRow;
Put this in a function, extend the prototype of JavaScript's Element object with it, and you're good.
A lot of answers, but the accepted one doesn't consider line breaks, Matthew Flaschen didn't add the solution code, and naXa answer has a mistake. The simplest solution code is:
textArea.focus();
const fullText = textArea.value;
textArea.value = fullText.substring(0, selectionEnd);
textArea.scrollTop = textArea.scrollHeight;
textArea.value = fullText;
textArea.setSelectionRange(selectionStart, selectionEnd);
You can see how we solved the problem in ProveIt (see highlightLengthAtIndex). Basically, the trick is to truncate the textarea, scroll to the end, then restore the second part of the text. We also used the textSelection plugin for consistent cross-browser behavior.
Valeriy Katkov's elegant solution works great but has two problems:
It does not work for long strings
Selected contents are scrolled to the bottom of the textarea, making it hard to see the context which surrounds the selection
Here's my improved version that works for long strings (tested with at least 50,000 words) and scroll selection to the center of the textarea:
function setSelectionRange(textarea, selectionStart, selectionEnd) {
// First scroll selection region to view
const fullText = textarea.value;
textarea.value = fullText.substring(0, selectionEnd);
// For some unknown reason, you must store the scollHeight to a variable
// before setting the textarea value. Otherwise it won't work for long strings
const scrollHeight = textarea.scrollHeight
textarea.value = fullText;
let scrollTop = scrollHeight;
const textareaHeight = textarea.clientHeight;
if (scrollTop > textareaHeight){
// scroll selection to center of textarea
scrollTop -= textareaHeight / 2;
} else{
scrollTop = 0;
}
textarea.scrollTop = scrollTop;
// Continue to set selection range
textarea.setSelectionRange(selectionStart, selectionEnd);
}
It works in Chrome 72, Firefox 65, Opera 58, and Edge 42.
For an example of using this function, see my GitHub project SmartTextarea.
This is a code inspired by the Matthew Flaschen's answer.
/**
* Scroll textarea to position.
*
* #param {HTMLInputElement} textarea
* #param {Number} position
*/
function scrollTo(textarea, position) {
if (!textarea) { return; }
if (position < 0) { return; }
var body = textarea.value;
if (body) {
textarea.value = body.substring(0, position);
textarea.scrollTop = position;
textarea.value = body;
}
}
Basically, the trick is to truncate the textarea, scroll to the end, then restore the second part of the text.
Use it as follows
var textarea, start, end;
/* ... */
scrollTo(textarea, end);
textarea.focus();
textarea.setSelectionRange(start, end);
Based on the idea from naXa and Valeriy Katkov, I refined the function with fewer bugs. It should work out of the box (It's written with TypeScript. For JavaScript, just remove the type declaration):
function scrollTo(textarea: HTMLTextAreaElement, offset: number) {
const txt = textarea.value;
if (offset >= txt.length || offset < 0)
return;
// Important, so that scrollHeight will be adjusted
textarea.scrollTop = 0;
textarea.value = txt.substring(0, offset);
const height = textarea.scrollHeight;
textarea.value = txt;
// Margin between selection and top of viewport
textarea.scrollTop = height - 40;
}
Usage:
let textarea, start, end;
/* ... */
scrollTo(textarea, start);
textarea.focus();
textarea.setSelectionRange(start, end);
Complete code for Chrome:
<script type="text/javascript">
var SAR = {};
SAR.find = function () {
debugger;
var parola_cercata = $("#text_box_1").val(); // The searched word
// Make text lowercase if search is
// supposed to be case insensitive
var txt = $('#remarks').val().toLowerCase();
parola_cercata = parola_cercata.toLowerCase();
// Take the position of the word in the text
var posi = jQuery('#remarks').getCursorPosEnd();
var termPos = txt.indexOf(parola_cercata, posi);
if (termPos !== -1) {
debugger;
var target = document.getElementById("remarks");
var parola_cercata2 = $("#text_box_1").val();
// Select the textarea and the word
if (target.setSelectionRange) {
if ('selectionStart' in target) {
target.selectionStart = termPos;
target.selectionEnd = termPos;
this.selectionStart = this.selectionEnd = target.value.indexOf(parola_cercata2);
target.blur();
target.focus();
target.setSelectionRange(termPos, termPos + parola_cercata.length);
}
} else {
var r = target.createTextRange();
r.collapse(true);
r.moveEnd('character', termPos + parola_cercata);
r.moveStart('character', termPos);
r.select();
}
} else {
// Not found from cursor pos, so start from beginning
termPos = txt.indexOf(parola_cercata);
if (termPos !== -1) {
var target = document.getElementById("remarks");
var parola_cercata2 = $("#text_box_1").val();
// Select the textarea and the word
if (target.setSelectionRange) {
if ('selectionStart' in target) {
target.selectionStart = termPos;
target.selectionEnd = termPos;
this.selectionStart = this.selectionEnd = target.value.indexOf(parola_cercata2);
target.blur();
target.focus();
target.setSelectionRange(termPos, termPos + parola_cercata.length);
}
} else {
var r = target.createTextRange();
r.collapse(true);
r.moveEnd('character', termPos + parola_cercata);
r.moveStart('character', termPos);
r.select();
}
} else {
alert("not found");
}
}
};
$.fn.getCursorPosEnd = function () {
var pos = 0;
var input = this.get(0);
// IE support
if (document.selection) {
input.focus();
var sel = document.selection.createRange();
pos = sel.text.length;
}
// Firefox support
else if (input.selectionStart || input.selectionStart === '0')
pos = input.selectionEnd;
return pos;
};
</script>
I published an answer here:
http://blog.blupixelit.eu/scroll-textarea-to-selected-word-using-javascript-jquery/
It works perfectly with just one needed rule: Set a line-height in the CSS content of the textarea!
It calculate the position of the word to scroll to just by doing some simple mathematical calculation and it worked perfectly in all my experiments!
I'm developing a off-line web-page for iPhone Safari.
For highlighting the user's selection in web-page. I've implemented following code.
function highlight() {
if (window.getSelection) {
sel = window.getSelection();
if (sel.getRangeAt) {
range = sel.getRangeAt(0);
}
document.designMode = "on";
if (range) {
sel.removeAllRanges();
sel.addRange(range);
}
document.execCommand("HiliteColor", false, "yellow");
document.designMode = "off";
}
}
That's working perfectly for normal selection.
Edit :
How to detect has user selected entire document or not?
What to do?
The following is a function that will return a Boolean indicating whether all of the contents of the specified element are selected and works in all major browsers, including IE. You can use this with document.body to test whether the whole page is selected.
function areElementContentsSelected(el) {
var range, elRange;
if (window.getSelection && document.createRange) {
var sel = window.getSelection();
if (sel.rangeCount) {
elRange = document.createRange();
elRange.selectNodeContents(el);
for (var i = 0, len = sel.rangeCount; i < len; ++i) {
range = sel.getRangeAt(i);
if (range.compareBoundaryPoints(range.START_TO_START, elRange) <= 0 && range.compareBoundaryPoints(range.END_TO_END, elRange) >= 0) {
return true;
}
}
}
} else if (document.selection && document.selection.createRange && document.selection.type == "Text") {
range = document.selection.createRange();
elRange = range.duplicate();
elRange.moveToElementText(el);
return range.compareEndPoints("StartToStart", elRange) <= 0 && range.compareEndPoints("EndToEnd", elRange) >= 0;
}
return false;
}
alert( areElementContentsSelected(document.body) );
But I don't want to allow user to select entire document & highlight it.
Why not?
Interfering with users' typically-expected-browsing-experience is never a good thing and usually leads to frustrated users simply disabling JS or choosing to abandon your site altogether.
Please reconsider.
Could you use selectNodeContents(document body) (pseudocode) to create a range representing the whole page, and then compare that to the range that the user selected?