How to replace the string after some character using index in javascript?

Question

i want to replace the string after @ character in the input field.

What i am trying to do? when i enter @ character in the input field the dropdown list with users is shown. when user selects one of the options from dropdown i want that value to be entered in the input field and the characters starting from @ should be replaced with the selected option from the dropdown.

For example say user types hello @u

dropdown is shown with options user1, user2, user3....

consider user selects user1 then the value in input field @u must be replaced with user1. so the complete string in input field must be

hello user1.

how do i replace @u with user1..

What i have tried?

i have tried to get the lastindex of the @ from the string using

string.lastIndexOf('@')

but not knowing how to replace the string starting from that index to end of string with the selected option.

Could someone help me solving this. thanks.

plsankar · Accepted Answer · 2019-07-02 17:26:15Z

0

you can use slice function

var selectedusername = "user1";
var inputtext = "Hello @U";
inputtext = inputtext.slice(0, inputtext.lastIndexOf('@')+1);
var newinputtext = inputtext + selectedusername;

then replace the old input text with the new one

answered Jul 2, 2019 at 17:26

plsankar

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stackoverflow_user Over a year ago

this works but want to remove @ character as well so replacing this inputtext = inputtext.slice(0, inputtext.lastIndexOf('@')+1); with inputtext = inputtext.slice(0, inputtext.lastIndexOf('@')); works for me.

adr5240 · Accepted Answer · 2019-07-02 17:20:15Z

0

Have you tried the following?

var str = "kdkd@kdkdf" 
var textAfterSymbol = str.slice(str.indexOf("@") + 1)

textAfterSymbol would be "kdkdf" which you can then do whatever you please with it (without editing str might I add).

answered Jul 2, 2019 at 17:20

adr5240

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stackoverflow_user Over a year ago

thanks this works too. except that i wanted the index of last occurence of @ in the string. upvoting this.

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