在输入框中按下Enter键时调用JavaScript函数

Question

Although I am able to call Javascript function on hitting the enter key. I am calling a function shortIt() when user hits the enter key, shortIt() takes the text from input box and makes a request to Google URL Shortener API which returns a short URL, but the generated response is visible for only some seconds. I am showing the response in a div.

Seems to be very weird problem, code is here https://s3-ap-southeast-1.amazonaws.com/s3freebucket/URLShortner/url-shortner.html

But when I click on shortIt button to short the url. It works fine and the response text stays in the div.

Answer 1

This is because on pressing the enter key, the form gets submitted. When this happens you will notice the page reloading. This is a default behaviour and is the consequence of using <form> . On form submission, the page in the forms action attribute is loaded. In this case the action attribute of the <form> is not set and so the page you are on is just reloaded, thus the script stops running and the page reloads.

Two straight forward options for fixing this:

1. (Simplest) Remove the form tag - it is not used to submit anything so removing it should leave things still working

2. Prevent the default action when the form submit event is fired.

   With JQuery:

   $('#myForm').on('submit', function (evt) { evt.preventDefault(); // prevents form submission });

Where myForm is the ID of your form tag. You will need add an id attribute to your existing html form tag: <form id="myForm" class="form-horizontal">