Databases
StackOverflow2013
Postsdbo
POHow can I pass a local variable from function to event listener function in JavaScript?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POHow can I pass a local variable from function to event listener function in JavaScript?
    primarykey
    data
    text
    <p>Good day!</p> <p>I began writing my own basic JavaScript library for personal use and distribution a few days ago, but I am having trouble with one of the methods, specifically <strong>bind()</strong>.</p> <p>Within the method itself, <strong>this</strong> refers to the library, the object.</p> <p>I went to Google and found <strong>function.call()</strong>, but it didn't work out the way I planned it--it just executed the function.</p> <p>If you take a look at another method, <strong>each()</strong>, you'll see that it uses <strong>call()</strong> to pass values.</p> <p>I also tried the following:</p> <pre><code>f.arguments[0]=this; </code></pre> <p>My console throws an error, saying it cannot read '0' of "undefined".</p> <p>I would like to be able to pass <strong>this</strong> (referencing the library--NOT THE WINDOW) to use it in the event listener.</p> <p>You can see it starting at line 195 of the JavaScript of <a href="http://jsfiddle.net/3fuab/" rel="nofollow">this JSFiddle</a>.</p> <p>Here it is as well:</p> <pre><code>bind:function(e,f){ if(e.indexOf("on")==0){ e=e.replace("on",""); } if(typeof f==='function'){ /*Right now, 'this' refers to the library How can I pass the library to the upcoming eventListener? */ //f=f(this); doesn't work //f.call(this); //doesn't work //this.target refers to the HTMLElement Object itself, which we are adding the eventListener to //the outcome I'm looking for is something like this: /*$('h3').which(0).bind(function({ this.css("color:red"); });*/ //(which() defines which H3 element we're dealing with //bind is to add an event listener this.target.addEventListener(e,f,false) } return this; }, </code></pre> <p>Thank you so much for your help, contributors!</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USRicky Yoder
    1. USRicky Yoder
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POHow can I pass a local variable from function to event listener function in JavaScript?
      1. This table or related slice is empty.
      1. VTUpMod
    1. COCould you please put the relevant code in this post here? A fiddle is nice for demonstration, but we're not going to go there and scan trough 200+ loc only for understanding the problem
      singulars
      1. POHow can I pass a local variable from function to event listener function in JavaScript?
      1. USBergi
    2. COEdited. (Good idea, lol)
      singulars
      1. POHow can I pass a local variable from function to event listener function in JavaScript?
      1. USRicky Yoder
    3. COHave you seen [JavaScript's `.bind()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/bind) method, which "[c]reates a new function that, when called, has its `this` keyword set to the provided value"? Alternatively, your library `.bind()` could pass its own proxy function to `addEventListener()`, and then that function could call `f` using `.call()` or `.apply()`.
      singulars
      1. POHow can I pass a local variable from function to event listener function in JavaScript?
      1. USnnnnnn
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload