I am having an issue linking an event to an if else statement. I was able to get an onkeypress event that changed the html content but I am having issues getting the content of what key was pressed after the event to run some code if they pressed a certain key. If you could help me figure out why my code isn't working that would be great. I am getting no syntax errors. I want it to console.log when I press the key "h".
HTML
<p>Guess what letter I'm thinking of!</p>
<br/ >
<div>Wins: </div>
<br/ >
<p id="losses">Losses: </p>
<br/ >
<p>Guesses Left: </p>
<br/ >
<p>Your Guesses so far: <span id="change"></span></p>
<br/ >
Javascript
window.onload = function() {
var guess = document.body.onkeypress = function(event){
document.getElementById("change").innerHTML = String.fromCharCode(event.keyCode);
}
function test(){
var letter = document.getElementById('change');
if(letter.innerHTML==="h"){
console.log('hi');
} else {
console.log("nothing");
}
}
}
This work for me i did not found in your code the invoke of test function so i wrapped in the onkeypress
var guess = document.body.onkeypress = function(event){
console.log(event);
document.getElementById("change").innerHTML =
String.fromCharCode(event.keyCode);
var letter = document.getElementById('change');
if(letter.innerHTML==="h"){
console.log('hi');
} else {
console.log("nothing");
}
};
<input> elements don't have any HTML content, so innerHTML always returns an empty string.
You can get the value of the textbox (not just the character, if any, that the user pressed) with .value.
Related
I've got a textarea with onkeypress function call, and i would like to check if the numbers of rows are more than 10: if they are, i would't like to write the character. How can i "stop" the writing after the function check?
<textarea id="textAr" maxlength="350" rows="6" onkeypress="check(this)"></textarea>
function checkLines(textArea){
var text = textArea.value;
var linesNumber = text.split("\n").length;
// alert("number of rows is: " + linesNumber);
if(linesNumber > 10){
???
}
}
To stop a character being written, you can use the event.preventDefault() method. We can do this by adding an event listener to the element in place of an onkeypress attribute.
function checkLines(event){
var text = this.value;
var linesNumber = text.split("\n").length;
// alert("number of rows is: " + linesNumber);
if(linesNumber > 10){
event.preventDefault();
}
}
document.querySelector("#textAr").addEventListener("keypress", checkLines);
You can also use event.key to fetch the key being pressed. This would allow you to only prevent new lines with the enter key ("Enter").
if(linesNumber > 10 && event.key == "Enter"){
event.preventDefault();
}
First time we press keyboard enter key should execute button(id="botonCorregir"). But the second time we press enter key should execute url().
I use cont, for the first time execute one part of the javascript code, and after when de cont value is 1, execute the second part of javascript code.
For some mistake, it doesn´t work.
thanks!
HTML:
<input id="respuestaUsuario"></input>
<button id="botonCorregir">Reply</button>
<a id="enlaceSiguiente" href="nextQuestion.html">Next question</a>
JAVASCRIPT:
<script>
var cont=0;
if(cont==0){
//Should enter the first press of enter
var input = document.getElementById("respuestaUsuario");
console.log('input: ', input)
input.addEventListener("keyup", function(event) {
if (event.keyCode == 13) {
event.preventDefault();
document.getElementById("botonCorregir").click();
}
});
cont++;
}else{
//Should enter the second press of enter
if (event.keyCode == 13) {
event.preventDefault();
document.getElementById("enlaceSiguiente").click();
}
}
</script>
You have a few mistakes in the code.
You are assigning the event based on the value of cont so always will have that functionality. Javascript does not re-interpret the code once the value of cont is changed.
I mean, Javascript check only one time the condition:
if(cont==0){}
This is a solution that works:
var cont=0;
var input = document.getElementById('respuestaUsuario');
input.addEventListener('keyup', function (event) {
event.preventDefault();
if (event.keyCode == 13) {
if(!cont){
alert('uno');
document.getElementById("botonCorregir").click();
cont++;
}else{
document.getElementById("enlaceSiguiente").click();
}
}
});
I guess you were on the right track, but the problem is that your Javascript only gets executed once. So, the else case will never be triggered. I refactored your code to use the check in the event listener:
var cont = 0;
var input = document.getElementById("respuestaUsuario");
input.addEventListener("keyup", function (event) {
if (event.keyCode == 13) {
event.preventDefault();
if (cont == 0) {
cont++;
document.getElementById("botonCorregir").click();
} else {
document.getElementById("enlaceSiguiente").click();
}
}
});
I also created a codepen for you to check out.
I'm trying to validate a character to make sure it's a letter (not a number, symbol, etc.) BEFORE it's allowed to be entered into the form field. How can I do that with JavaScript?
Here is something I tried:
<script type="text/javascript">
function checkTest() {
var letterValue = document.forms[0].test.value;
var letterCheck = /[a-z]/i;
var letterTest = letterValue.test(letterCheck);
}
</script>
<html>
<body>
<form>
<input type="text" name="test" onkeypress="checkTest();"/>
</form>
</body>
</html>
This code will check the string of the value. I've tried using var letterLeng= letterValue.length and then using var letterChar = letterValue.charAt(letterLeng) or even var letterChar = letterValue.charAt(letterLeng - 1) and all to no avail. Any advice would be much appreciated.
Ask the event for the key that was pressed then test it:
function checkTest(event) {
event = event || window.event;
if (!/[A-Za-z]/.test(String.fromCharCode(event.keyCode || event.which))) {
if (event.preventDefault)
event.preventDefault();
else
event.returnValue = false;
}
}
<input type="text" name="test" onkeypress="checkTest(event);"/>
I like Alex K's answer, but I could not get the 'onkeypress' handler to work so I tried something using Jquery. It doesn't keep the bad letters from appearing briefly, but it does keep them from being entered.
It uses the 'keyup' event, which actually makes checking for the key code much easier in this instance since you want to limit it to [a-zA-Z]
$("#myinput").on("keyup", function (e) {
// Ignore the shift key.
if (e.keyCode === 16) {
return true;
}
if ((e.keyCode < 65 || e.keyCode > 90)) {
var str = $("#myinput").val();
$("#myinput").val(str.slice(0, str.length - 1));
}
});
The working fiddle is here: http://jsfiddle.net/yaa9snce/
What you are looking for is the onkeypress event.
<input type="text" onkeypress="myFunction()">
<script>
function myFunction() {
alert("You pressed a key inside the input field");
}
</script>
I have a javascript code that works by removing the first and the last line of it.
Please take a look at JSFiddle
for people who wants to see it in here, here is my html:
<input id="search" onclick="search()" type="button" value="Search"/>
my javascript :
function search() {
var search = document.getElementById('search');
var int = setInterval(function() {
if (search.value.length == 6)
search.value = 'Searchi';
else if (search.value.length == 7)
search.value = 'Searchin';
else if (search.value.length == 8)
search.value = 'Searching';
else {
search.value= 'Search';
}
//clearInterval( int ); // at some point, clear the setInterval
}, 500);
}
I want the function to work only when I click the button.
You've selected jQuery in jsfiddle.net which by default causes the site to wrap your whole code in a document.ready handler.
The result is that your search function becomes a local function within that wrapper, and not a global variable as required by a DOM0 onclick handler.
Set the jsfiddle options to "no wrap (body)" and "No-Library (pure js)" to turn off that functionality.
Using JavaScript how do you to detect what text the user pastes into a textarea?
You could use the paste event to detect the paste in most browsers (notably not Firefox 2 though). When you handle the paste event, record the current selection, and then set a brief timer that calls a function after the paste has completed. This function can then compare lengths and to know where to look for the pasted content. Something like the following. For the sake of brevity, the function that gets the textarea selection does not work in IE. See here for something that does: How to get the start and end points of selection in text area?
function getTextAreaSelection(textarea) {
var start = textarea.selectionStart, end = textarea.selectionEnd;
return {
start: start,
end: end,
length: end - start,
text: textarea.value.slice(start, end)
};
}
function detectPaste(textarea, callback) {
textarea.onpaste = function() {
var sel = getTextAreaSelection(textarea);
var initialLength = textarea.value.length;
window.setTimeout(function() {
var val = textarea.value;
var pastedTextLength = val.length - (initialLength - sel.length);
var end = sel.start + pastedTextLength;
callback({
start: sel.start,
end: end,
length: pastedTextLength,
text: val.slice(sel.start, end)
});
}, 1);
};
}
var textarea = document.getElementById("your_textarea");
detectPaste(textarea, function(pasteInfo) {
alert(pasteInfo.text);
// pasteInfo also has properties for the start and end character
// index and length of the pasted text
});
HTML5 already provides onpaste not only <input/> , but also editable elements (<p contenteditable="true" />, ...)
<input type="text" onpaste="myFunction()" value="Paste something in here">
More info here
Quite an old thread, but you might now use https://willemmulder.github.io/FilteredPaste.js/ instead. It will let you control what gets pasted into a textarea or contenteditable.
Works on IE 8 - 10
Creating custom code to enable the Paste command requires several steps.
Set the event object returnValue to false in the onbeforepaste event to enable the Paste shortcut menu item.
Cancel the default behavior of the client by setting the event object returnValue to false in the onpaste event handler. This applies only to objects, such as the text box, that have a default behavior defined for them.
Specify a data format in which to paste the selection through the getData method of the clipboardData object.
invoke the method in the onpaste event to execute custom paste code.
To invoke this event, do one of the following:
Right-click to display the shortcut menu and select Paste.
Or press CTRL+V.
Examples
<HEAD>
<SCRIPT>
var sNewString = "new content associated with this object";
var sSave = "";
// Selects the text that is to be cut.
function fnLoad() {
var r = document.body.createTextRange();
r.findText(oSource.innerText);
r.select();
}
// Stores the text of the SPAN in a variable that is set
// to an empty string in the variable declaration above.
function fnBeforeCut() {
sSave = oSource.innerText;
event.returnValue = false;
}
// Associates the variable sNewString with the text being cut.
function fnCut() {
window.clipboardData.setData("Text", sNewString);
}
function fnBeforePaste() {
event.returnValue = false;
}
// The second parameter set in getData causes sNewString
// to be pasted into the text input. Passing no second
// parameter causes the SPAN text to be pasted instead.
function fnPaste() {
event.returnValue = false;
oTarget.value = window.clipboardData.getData("Text", sNewString);
}
</SCRIPT>
</HEAD>
<BODY onload="fnLoad()">
<SPAN ID="oSource"
onbeforecut="fnBeforeCut()"
oncut="fnCut()">Cut this Text</SPAN>
<INPUT ID="oTarget" TYPE="text" VALUE="Paste the Text Here"
onbeforepaste="fnBeforePaste()"
onpaste="fnPaste()">
</BODY>
Full doc: http://msdn.microsoft.com/en-us/library/ie/ms536955(v=vs.85).aspx
I like the suggestion for the right click
$("#message").on('keyup contextmenu input', function(event) {
alert("ok");
});
finded here:
Source:
Fire event with right mouse click and Paste
Following may help you
function submitenter(myfield,e)
{
var keycode;
if (window.event) keycode = window.event.keyCode;
else if (e) keycode = e.which;
else return true;
if (keycode == //event code of ctrl-v)
{
//some code here
}
}
<teaxtarea name="area[name]" onKeyPress=>"return submitenter(this,event);"></textarea>
The input event fires when the value of an , , or element has been changed.
const element = document.getElementById("input_element_id");
element.addEventListener('input', e => {
// insertText or insertFromPaste
if(inputType === "insertFromPaste"){
console.log("This text is copied");
}
if(inputType === "insertText"){
console.log("This text is typed");
}
})
You could either use html5 oninput attribute or jquery input event
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script>
$("body").on('input','#myinp',function(){
$("span").css("display", "inline").fadeOut(2000);
});
</script>
<style>
span {
display: none;
}
</style>
</head>
<body>
<input id="myinp" type="search" onclick="this.select()" autocomplete="off" placeholder="paste here">
<span>Nice to meet you!</span>
</body>
</html>