Solved

How to find a string in a variable field using javascript

Posted on 2016-07-22
8
61 Views
Last Modified: 2016-07-23
Hello,   I am new to javascript and been searching for a way to search for a string to be found in a variable field.  
Example:  
Have a variable x    x="Hello World"   I would like to check the variable x to see if it contains "He".  
I thought I could use something like this:
if (trimTrailingSpaces(x)=="He*") {     } .
.
Is there a  way to do this using javascripts.
Like I said I am new to this.  
Any help would be appreciated.
Thanks
0
Comment
Question by:tambrosi
8 Comments
 
LVL 5

Assisted Solution

by:Eric C
Eric C earned 125 total points
ID: 41725213
EXAMPLE:

var myList = "Ford, Chevy, and Toyota";
var mySearch = "Audi";

// function
function findInList (vehicle) {
    if (myList.indexOf(vehicle) >= 0) {
        console.log(vehicle + " is in the string");
    }
    else {
        console.log(vehicle + " is not in the string.");
    }
}


// call the function
findInList(mySearch);
0
 
LVL 16

Assisted Solution

by:gurpsbassi
gurpsbassi earned 125 total points
ID: 41725332
if(x.indexOf("He") > -1){
  //success
}
0
 
LVL 5

Expert Comment

by:Eric C
ID: 41725348
My comment is the same result ... > -1 is the same as >= 0.     ;-)
0
Free Tool: Site Down Detector

Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

 
LVL 16

Expert Comment

by:gurpsbassi
ID: 41725357
My comment is the same result ... > -1 is the same as >= 0.     ;-)

yes depends on coding style.
both are valid.
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 41725419
Posting JavaScript questions in the Java TA is not appropriate, and might make your question less likely to be answered. http://technojeeves.com/joomla/index.php/free/127-javascript-is-not-java
2
 
LVL 22

Expert Comment

by:Kim Walker
ID: 41725576
if (trimTrailingSpaces(x)=="He*") {     }
If you were using a search method that recognizes the asterisk as a wild card character, the above condition would be looking for a string that begins with "He", not just contains "He". Which do you wish to search for, contains or begins with?
0
 
LVL 49

Accepted Solution

by:
Roonaan earned 250 total points
ID: 41725585
Given your "He*" example, I am going to assume you like to think in pattern matching style.

In Javascript one would use a regular expression to achieve this:

if (x.match(/He/)) { .... }

Open in new window


If you want to make sure the variable starts with "He", you would need to add a begin of line marker:
if(x.match(/^He/)) { ... }

Open in new window


You can play with regular expressions at various sites. I just looked up this one on a search engine: regexr.com

Kind regards,

-r-
0
 

Author Closing Comment

by:tambrosi
ID: 41725759
First, sorry I posted question to wrong area.
Thanks for all of the answers, all of them posted really helped me understand the javascripting code stream.  That was the first time I looked/tested the function process, and it will be something I can use in the future.
Like I said, I am really new to this and really appreciated the help!!
Thanks.
0

Featured Post

Announcing the Most Valuable Experts of 2016

MVEs are more concerned with the satisfaction of those they help than with the considerable points they can earn. They are the types of people you feel privileged to call colleagues. Join us in honoring this amazing group of Experts.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Java functions are among the best things for programmers to work with as Java sites can be very easy to read and prepare. Java especially simplifies many processes in the coding industry as it helps integrate many forms of technology and different d…
This article discusses how to create an extensible mechanism for linked drop downs.
This theoretical tutorial explains exceptions, reasons for exceptions, different categories of exception and exception hierarchy.
Viewers will learn how to properly install Eclipse with the necessary JDK, and will take a look at an introductory Java program. Download Eclipse installation zip file: Extract files from zip file: Download and install JDK 8: Open Eclipse and …

828 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question