Right now i can detect if the input changes in the TinyMCE Editor, but i can't seem to figure out how to get what was changed/typed.
setup:function(editor) {
editor.on('input', function(e){
//pseudo condition
if (this.value === 'X') {
console.log('You type X', e);
}
});
}
I would like it to reach the console.log if X is typed into the editor, and maybe a way to move from that position back and forward just in case i have read pre and post text from that specific position.
The purpose of this is to be able to trigger another action when a specific word is typed into the editor like for suggestions and such.
There is a slice() function in JavaScript that returns you a "slice" of a string. You can use it to determine (for example) what are the last 6 characters in your input.
Example:
setup:function(editor) {
editor.on('input', function(e){
if (this.value.slice(this.value.length - 6, this.value.length) === '{link:') {
//Do magic
}
});
}
Related
Is there a proper way to handle both copy/paste and max length using contenteditable in Jquery? Currently, I am using the code below only for max length. However, if a user decided to copy paste a text that is longer than the max length allowed, the text will still go through.
Basically, my goal is to set character's limit up to 200 in length, also I want a decent way to handle if a user decided to copy paste something, especially if it is longer than the max length allowed.
$('div').keydown(function (event) {
if($(this).text().length >= 200 && event.keyCode != 8) {
event.preventDefault();
}
});
You can add a paste Event:
$('div').on('paste', function(event) {
// handle event
});
Read more about it in the MDN Web Docs.
var editable = $('div');
editable.on('paste', function(event) {
if (editable.text().length >= 200) {
editable.textContent = editable.text().substr(0,200); // it uses the whole content of the editable div
}
});
I am sure this is something really stupid I am missing.
I am writing a small snippet that adds a hyphen to a string grabbed from an input field. The hyphen is only added once we hit position 4, so I can type 123 and the hyphen will not appear. If I type 1234, it'll automatically change to 1234-. The problem is with handling pasting, somewhere down the line inside jQuery (after my code has executed), it's injecting more characters into the field.
My approach is simple enough. I look at the keyup and keydown event, check the input and insert the hyphen. For pasting I look at the paste even, grab the string, split it and insert a hyphen depending on if one is present or not.
$('[id$="field"]').on('paste', function (event) {
var element = this;
var text = event.originalEvent.clipboardData.getData('text').split('');
if (text.length > 4 && text.indexOf('-') < 0) {
text.splice(4, 0, '-');
$(element).val(text.join(''));
}
});
$('[id$="field"]').bind('keyup keydown', function (event) {
var input = $(this).val();
if (input.length === 4 && event.keyCode !== 8) {
$($(this).val(input + '-'));
}
});
The keyup and keydown listener works just fine. If I paste in 12345, I end up with 1234-5 when I hit $(element).val(text.join('')); yet afterwards that extra char pops whilst jQuery is doing its thing.
I am rather baffled.
Any ideas?
Since you are overriding the typical "paste" behavior by updating the value of the input box directly, you need to prevent the "default" paste behavior.
$('[id$="field"]').on('paste', function (event) {
event.preventDefault();
// ...
I am having a input type text.
<input type="text" class="checkForDot" />
What i am trying to do is, when a user enters numbers into the box then find for the "." in the field, if it contains more then one ".", then prevent it to enter another "." in the text field.
my jquery code is:
$(".checkForDot").on("keyup", function (event) {
CheckForDot($(this).val());
});
function CheckForDot(value) {
if (value != null || value != '') {
var str = value.toString();
if (str.indexOf('.', str.indexOf('.') + 1) != -1) {
console.log("ok");
}
}
}
It is working fine, if two "." enters into the text box, but how to prevent to enter multiple "." in the text field?
If any other approach better than this please tell.
$(document).ready(function() {
var original='';
$('.checkForDot').on('input', function() {
if ($(this).val().replace(/[^.]/g, "").length > 1){
$(this).val(original);
}else{
original = $(this).val();
}
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type='text' class='checkForDot' />
Try to use this regex to find how many dots you got in string.
If you are looking to make a field that only allows for numbers, you should consider using an input of type="number" as they will only allow for valid number characters to by added to its value. In some cases, it might even bring a different visual keyboard to ease of filling, wich is better for accessibility and UX. The number input field will, by default allow for mutliple dots, wich is annoying and is a bit harder to prevent than in a text field so it's a case of figuring wether accessibility and your UX is more important than adding a few extra lines of Javascript.
A lot of people will tell you that it is bad practice to limit keyboard actions, and they are right. when you do a preventDefault() on everything but numbers and ".", you disable tabing through form fields, the browser alt menu, any ctrl shortcuts, anything that happens within the browser.
This solution is simple and will only allow one dot in the number field. It doesn't prevent from clicking back in the number and adding numbers before the ".". It doesn't prevent from executing browser keyboard shortcuts like refresh, copy and pasting, as long as the pasted value is a valid number. It will allow to add "." withing the body of the number.
The only behavior that can't be prevented is if the user press the dot key at the end of the input repeatedly, the dot will blink on and off. This happens because of the way the number field handles its value. Wen the user types a dot at the end of a number like "13.", javascript can only retreive "13" when looking at its value as long as no decimal number have been placed. If the user typed a dot again, the value of "13.." would not be a valid number and therefore javascript woudl retreive "". This ensure you eighter get a valid number or nothing at all. In my solution, if a value returns "" without the press of backspace, delete or cut, it gets rolled back to the last valid value, wich in my example was "13", obtained from the typed value "13.". Preventing this behavior seems practically impossible and isn't a deal breaker as you get ensured your field value is always a valid, single dot number.
let lastValidInputValue;
let selectedDot = false;
const onKeypress = (e) => {
if (e.key === "." && e.target.value.indexOf(".") !== -1 && !selectedDot) e.preventDefault();
selectedDot = false;
};
const onInput = (e) => {
if (e.target.value !== "") {
lastValidInputValue = e.target.value;
} else if (e.inputType.match(/delete/g)) {
lastValidInputValue = "";
} else {
e.target.value = lastValidInputValue;
}
};
const onSelect = (e) => {
selectedDot = (window.getSelection().toString().indexOf(".") > -1)? true : false;
}
<input type="number" id="myNumber" name="myNumber" step="any" onkeypress="onKeypress(event)" oninput="onInput(event)" onselect="onSelect(event)">
You can find very detailed comments and extra bits in this Codepen
I know this seems a quite easy target. I have an input[type=text], and I want to detect the new added character(s) in it. The normal way is:
$selector.keypress(function(e) {
//do sth here
var newchar = String.fromCharCode(e.which);
});
But the above method not working properly for some browsers on android devices. Typing the android virtual keyboard will not fire the keypress.
Then I found the following method is better:
$selector.on('input', function(e){
//do sth here
});
It works fine for android devices, and also, it can detect cut/paste.
Now the question is, is there a way to know the new added character(s) to the input? Do I need to do the complicated string comparison during inputing each time, i.e. compare the previous string and the new string in the input box? I said it's complicated because you may not always type in char(s) at the end, you may insert some char(s) in the middle of the previous string. Think about this, the previous string in the input box is "abc", the new string after pasting is "abcxabc", how can we know the new pasted string is "abcx", or "xabc"?
The method from keypress is quite simple:
String.fromCharCode(e.which);
So, is there similar way to do this by the on('input') method?
After reading Yeldar Kurmangaliyev's answer, I dived into this issue for a while, and find this is really more complicated than my previous expectation. The key point here is that there's a way to get the cursor position by calling: selectionEnd.
As Yeldar Kurmangaliyev mentioned, his answer can't cover the situation:
it is not working is when you select text and paste another text with
replacing the original one.
Based on his answer, I modified the getInputedString function as following:
function getInputedString(prev, curr, selEnd) {
if (selEnd === 0) {
return "";
}
//note: substr(start,length) and substring(start,end) are different
var preLen = prev.length;
var curLen = curr.length;
var index = (preLen > selEnd) ? selEnd : preLen;
var subStrPrev;
var subStrCurr;
for(i=index; i > 0; i--){
subStrPrev = prev.substr(0, i);
subStrCurr = curr.substr(0, i);
if (subStrCurr === subStrPrev) {
var subInterval = selEnd - i;
var interval = curLen - preLen;
if (interval>subInterval) {
return curr.substring(i, selEnd+(interval-subInterval));
}
else{
return curr.substring(i, selEnd);
}
}
}
return curr.substring(0, selEnd);
}
The code is quite self explanation. The core idea is, no matter what character(s) were added(type or paste), the new content MUST be ended at the cursor position.
There's also one issue for my code, e.g. when the prev is abcabc|, you select them all, and paste abc, the return value from my code will be "". Actually, I think it's reasonable, because for my scenario, I think this is just the same with delete the abc from previous abcabc|.
Also, I changed the on('input') event to on('keyup'), the reason is, for some android browsers, the this.selectionEnd will not work in a same way, e.g., the previous text is abc|, now I paste de and the current string will be abcde|, but depending on different browsers, the this.selectionEnd inside on('input') may be 3, or 5. i.e. some browsers will report the cursor position before adding the input, some will report the cursor position after adding the input.
Eventually, I found on('keyup') worked in the same way for all the browsers I tested.
The whole demo is as following:
DEMO ON JSFIDDLE
Working on the cross-browser compatibility is always difficult, especially when you need to consider the touch screen ones. Hope this can help someone, and have fun.
Important notes:
when a user types in a character, the cursor stands after it
when a user pastes the text, the cursor is also located after the pasted text
Assuming this, we can try to suggest the inputed \ pasted string.
For example, when we have a string abc and it becomes abcx|abc (| is a cursor) - we know that actually he pasted "abcx", but not "xabc".
How do this algorithmically? Lets assume that we have the previous input abc and the current input: abcx|abc (cursor is after x).
The new one is of length 7, while the previous one is of length 4. It means that a user inputed 4 characters. Just return these four characters :)
The only case when it is not working is when you select text and paste another text with replacing the original one. I am sure you will come up with a solution for it yoruself :)
Here is the working snippet:
function getInputedString(prev, curr, selEnd) {
if (prev.length > curr.length) {
console.log("User has removed \ cut character(s)");
return "";
}
var lengthOfPasted = curr.length - prev.length;
if (curr.substr(0, selEnd - lengthOfPasted) + curr.substr(selEnd) === prev)
{
return curr.substr(selEnd - lengthOfPasted, lengthOfPasted);
} else {
console.log("The user has replaced a selection :(");
return "n\\a";
}
}
var prevText = "";
$("input").on('input', function() {
var lastInput = getInputedString(prevText, this.value, this.selectionEnd);
prevText = this.value;
$("#result").text("Last input: " + lastInput);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="text" />
<div id="result">Start inputing...</div>
Basically have a large textarea, and I want to be able to do a few things with it;
Detect when the user presses "enter" to go to a new line,
and
When enter is pressed, if the line contains a certain string let's say "hello", a line would be written to the textarea that reads "hello to you."
I cannot, for the life of me, detect a string from within a textarea. I am a huge newb, though.
Much obliged.
I would use a JavaScript framework like jQuery for this purpose. The code would look something like this:
$(function() {
$('textarea').keypress(function(event) {
if (event.which == 13) { // Return key
var textareaText = $(this).val();
if (textareaText.match(/hello/)) {
$(this).val(textareaText+"\nhello to you.");
}
}
});
});