Check if text input contains a specific string

Question

I am using the following jquery snippet to append ' UK' to a text input when the user presses enter on his/her keyboard:

jQuery('#myinput').one('keypress', function (e) {
  if (e.which == 13) {
    jQuery('#myinput').val($('#myinput').val() + ' UK');
    return false;
  }
});

However, I only want 'UK' to be appended if the text doesn't already contain 'UK'. Is there any easy way to check if 'UK' is already present using jQuery?

I have tried the following, but this appends nothing either way:

if ( !'#myinput:contains("UK")') {
   jQuery('#myinput').one('keypress', function (e) {
      if (e.which == 13) {
         jQuery('#myinput').val($('#myinput').val() + ' UK');
         return false;
      }
   }
});

Tushar Gupta - curioustushar · Accepted Answer · 2014-02-05 14:57:13Z

4

Try .indexOf()

if (e.which == 13 && this.value.indexOf('UK') === -1){

this keyword

if (e.which == 13 && this.value.indexOf('UK') === -1) {
    this.value = this.value + 'UK';
}

answered Feb 5, 2014 at 14:57

Tushar Gupta - curioustushar

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5 Comments

user1444027 Over a year ago

Great, thanks. This works very nicely! Can I also check if it is lowercase 'uk' somehow as well?

Tushar Gupta - curioustushar Over a year ago

@user1444027 Yes if (e.which == 13 && (this.value.indexOf('UK') === -1 || this.value.indexOf('Uk'))) {

Ram Over a year ago

this.value.toLowerCase().indexOf('uk')

Tushar Gupta - curioustushar Over a year ago

@user1444027 or better just check if (e.which == 13 && this.value.toUpperCase().indexOf('UK') === -1)

Tushar Gupta - curioustushar Over a year ago

@BlackSheep thanks i was on it too u beat my fingers :)

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