CODEWITHSUNDEEP
javascript
wordwannabe
wordwannabe

Reputation: 101

storing the argument of a function in a variable in JavaScript

I am trying to store a value of an argument of a function to a variable.

var store;

function load_event(page_id){
    store = page_id;
    alert(page_id); //Works fine
}

alert(store); //Undefined???

The page_id is the argument got from another PHP file (so that PHP file is calling the function).

I do not understand why this store variable returns undefined?

PHP CODE!

<div id="primary" class="content-area">
    <div id="content" class="site-content" role="main">

            <?php 

                $post = $wp_query -> post;
                $post_id = $post->ID;
                echo $post_id; //Get the post_id of the current post.
            ?>
            <script>    
                loadEvent("<?php echo json_encode($post_id); ?>");
            </script>



    </div><!-- #content -->
</div><!-- #primary -->

Upvotes: 1

Views: 114

Answers (2)

doforumda
doforumda

Reputation: 174

If you call load_event() before alert(store). The reason is that you are using alert(store) before the function load_event() has been called. At this point, the value in store is undefined. That is because the load_event() function is not executed until you call it so alert(store) is executed first and which evaluates store to undefined and then load_event() is executed that sets the value of store to page_id. Move the load_event() before alert(store) will solve the problem.

Upvotes: 2

Biswajit Maji
Biswajit Maji

Reputation: 889

You need to call the function to execute the function

var store;

function load_event(page_id){
    store = page_id;
    alert(page_id); //Works fine
}
load_event(2);

alert(store); //2

Upvotes: 2

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