Mixing
Use event.key instead of event.keyCode
So lets say that I have code that checks if an keypress was a number
if (e.keyCode >= 48 && e.keyCode <= 57 || e.keyCode >= 96 && e.keyCode <= 105 ) {
// number entered, do something
} else if (e.keyCode === 8) {
// backspace pressed
}
How would I go about changing these checks to use event.key as event.keyCode is depreciated. Is it as easy as I think it is?
In particular how to I use e.key with the backspace key
javascript
asked Nov 21 '18 at 0:21
GrandFleetGrandFleet
1851212
add a comment |
So lets say that I have code that checks if an keypress was a number
if (e.keyCode >= 48 && e.keyCode <= 57 || e.keyCode >= 96 && e.keyCode <= 105 ) {
// number entered, do something
} else if (e.keyCode === 8) {
// backspace pressed
}
How would I go about changing these checks to use event.key as event.keyCode is depreciated. Is it as easy as I think it is?
In particular how to I use e.key with the backspace key
javascript
asked Nov 21 '18 at 0:21
GrandFleetGrandFleet
1851212
Do you really want to check the keyCode or the character that was generated? The keyCode just tells you the key that was pressed, it doesn't tell you the character it generated, e.g. if one or more modifier keys are also pressed, pressing the "G" key might return "g", "G", "©", "˝", and so on.
– RobG
Nov 21 '18 at 0:29
add a comment |
So lets say that I have code that checks if an keypress was a number
if (e.keyCode >= 48 && e.keyCode <= 57 || e.keyCode >= 96 && e.keyCode <= 105 ) {
// number entered, do something
} else if (e.keyCode === 8) {
// backspace pressed
}
How would I go about changing these checks to use event.key as event.keyCode is depreciated. Is it as easy as I think it is?
In particular how to I use e.key with the backspace key
javascript
asked Nov 21 '18 at 0:21
GrandFleetGrandFleet
1851212
So lets say that I have code that checks if an keypress was a number
if (e.keyCode >= 48 && e.keyCode <= 57 || e.keyCode >= 96 && e.keyCode <= 105 ) {
// number entered, do something
} else if (e.keyCode === 8) {
// backspace pressed
}
How would I go about changing these checks to use event.key as event.keyCode is depreciated. Is it as easy as I think it is?
In particular how to I use e.key with the backspace key
javascript
javascript
asked Nov 21 '18 at 0:21
GrandFleetGrandFleet
1851212
asked Nov 21 '18 at 0:21
GrandFleetGrandFleet
1851212
asked Nov 21 '18 at 0:21
GrandFleetGrandFleet
1851212
asked Nov 21 '18 at 0:21
GrandFleetGrandFleet
1851212
asked Nov 21 '18 at 0:21
GrandFleetGrandFleet
1851212
1851212
Do you really want to check the keyCode or the character that was generated? The keyCode just tells you the key that was pressed, it doesn't tell you the character it generated, e.g. if one or more modifier keys are also pressed, pressing the "G" key might return "g", "G", "©", "˝", and so on.
– RobG
Nov 21 '18 at 0:29
add a comment |
Do you really want to check the keyCode or the character that was generated? The keyCode just tells you the key that was pressed, it doesn't tell you the character it generated, e.g. if one or more modifier keys are also pressed, pressing the "G" key might return "g", "G", "©", "˝", and so on.
– RobG
Nov 21 '18 at 0:29
Do you really want to check the keyCode or the character that was generated? The keyCode just tells you the key that was pressed, it doesn't tell you the character it generated, e.g. if one or more modifier keys are also pressed, pressing the "G" key might return "g", "G", "©", "˝", and so on.
– RobG
Nov 21 '18 at 0:29
Do you really want to check the keyCode or the character that was generated? The keyCode just tells you the key that was pressed, it doesn't tell you the character it generated, e.g. if one or more modifier keys are also pressed, pressing the "G" key might return "g", "G", "©", "˝", and so on.
– RobG
Nov 21 '18 at 0:29
add a comment |
1 Answer
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You just change it to use the name of the key being pressed. For letters it is the letter pressed, a = "a", A = "A", z = "z" etc. Number is the the string version of the number 1 = "1", 2 = "2" etc. For control keys it is the name of the key, ctrl = "Control", backspace = "Backspace", etc.
A list can be seen here
So if you are needing to test for number range you can get the key value and coerce it to a number and just do the applicable comparison, as for backspace just compare against the string "Backspace"
//coerce it to a number
numKey = +e.key;
if (!isNaN(numKey) && numKey >= 0 && numKey <= 9 ) {
// number entered, do something
} else if (e.key == "Backspace") {
// backspace pressed
}
answered Nov 21 '18 at 0:35
Patrick EvansPatrick Evans
32.1k54771
add a comment |
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1 Answer
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oldest
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1 Answer
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active
oldest
votes
active
oldest
votes
active
oldest
votes
You just change it to use the name of the key being pressed. For letters it is the letter pressed, a = "a", A = "A", z = "z" etc. Number is the the string version of the number 1 = "1", 2 = "2" etc. For control keys it is the name of the key, ctrl = "Control", backspace = "Backspace", etc.
A list can be seen here
So if you are needing to test for number range you can get the key value and coerce it to a number and just do the applicable comparison, as for backspace just compare against the string "Backspace"
//coerce it to a number
numKey = +e.key;
if (!isNaN(numKey) && numKey >= 0 && numKey <= 9 ) {
// number entered, do something
} else if (e.key == "Backspace") {
// backspace pressed
}
answered Nov 21 '18 at 0:35
Patrick EvansPatrick Evans
32.1k54771
add a comment |
You just change it to use the name of the key being pressed. For letters it is the letter pressed, a = "a", A = "A", z = "z" etc. Number is the the string version of the number 1 = "1", 2 = "2" etc. For control keys it is the name of the key, ctrl = "Control", backspace = "Backspace", etc.
A list can be seen here
So if you are needing to test for number range you can get the key value and coerce it to a number and just do the applicable comparison, as for backspace just compare against the string "Backspace"
//coerce it to a number
numKey = +e.key;
if (!isNaN(numKey) && numKey >= 0 && numKey <= 9 ) {
// number entered, do something
} else if (e.key == "Backspace") {
// backspace pressed
}
answered Nov 21 '18 at 0:35
Patrick EvansPatrick Evans
32.1k54771
add a comment |
You just change it to use the name of the key being pressed. For letters it is the letter pressed, a = "a", A = "A", z = "z" etc. Number is the the string version of the number 1 = "1", 2 = "2" etc. For control keys it is the name of the key, ctrl = "Control", backspace = "Backspace", etc.
A list can be seen here
So if you are needing to test for number range you can get the key value and coerce it to a number and just do the applicable comparison, as for backspace just compare against the string "Backspace"
//coerce it to a number
numKey = +e.key;
if (!isNaN(numKey) && numKey >= 0 && numKey <= 9 ) {
// number entered, do something
} else if (e.key == "Backspace") {
// backspace pressed
}
answered Nov 21 '18 at 0:35
Patrick EvansPatrick Evans
32.1k54771
You just change it to use the name of the key being pressed. For letters it is the letter pressed, a = "a", A = "A", z = "z" etc. Number is the the string version of the number 1 = "1", 2 = "2" etc. For control keys it is the name of the key, ctrl = "Control", backspace = "Backspace", etc.
A list can be seen here
So if you are needing to test for number range you can get the key value and coerce it to a number and just do the applicable comparison, as for backspace just compare against the string "Backspace"
//coerce it to a number
numKey = +e.key;
if (!isNaN(numKey) && numKey >= 0 && numKey <= 9 ) {
// number entered, do something
} else if (e.key == "Backspace") {
// backspace pressed
}
answered Nov 21 '18 at 0:35
Patrick EvansPatrick Evans
32.1k54771
answered Nov 21 '18 at 0:35
Patrick EvansPatrick Evans
32.1k54771
answered Nov 21 '18 at 0:35
Patrick EvansPatrick Evans
32.1k54771
answered Nov 21 '18 at 0:35
Patrick EvansPatrick Evans
32.1k54771
32.1k54771
add a comment |
add a comment |
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Do you really want to check the keyCode or the character that was generated? The keyCode just tells you the key that was pressed, it doesn't tell you the character it generated, e.g. if one or more modifier keys are also pressed, pressing the "G" key might return "g", "G", "©", "˝", and so on.
– RobG
Nov 21 '18 at 0:29