Incorrect JavaScript Parameters Syntax

Question

I'm trying to use JavaScript parameters in a function, but I'm not writing the syntax correctly.

This function is supposed to revert information in objects with the aa tag into whatever is specified with ba.

function myFunction(aa, ba){
    document.getElementById(aa).innerHTML = ba;
}

<p id="demo">JavaScript can change HTML content.</p>

<button type="button" onclick="myFunction(demo, My First Javascript)">Click Me!</button>

167141162 · Accepted Answer · 2017-12-02 03:24:24Z

2

Add single quotes around the inputs to your function:

Javascript:

function myFunction(aa, ba){
    document.getElementById(aa).innerHTML = ba;
}

html:

<p id="demo">JavaScript can change HTML content.</p>

<button type="button" onclick="myFunction('demo', 'My First Javascript')">Click Me!</button>

here's a link to a codepen.io demo: https://codepen.io/167141162/pen/Vrgvbg

answered Dec 2, 2017 at 3:24

167141162

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Comments

doubleOrt · Accepted Answer · 2017-12-02 03:27:52Z

1

Strings in JavaScript must be wrapped in either "" or ''. In your example, JavaScript will think that you are trying to pass a variable (or a function) called demo for the first argument, and the second one (My First Javascript) will throw a SyntaxError.

So, this will work:

function myFunction(aa, ba){
    document.getElementById(aa).innerHTML = ba;
}

<p id="demo">JavaScript can change HTML content.</p>

<button type="button" onclick="myFunction('demo', 'My First Javascript')">Click Me!</button>

edited Dec 2, 2017 at 3:27

answered Dec 2, 2017 at 3:22

doubleOrt

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Comments

Denno · Accepted Answer · 2017-12-02 03:21:33Z

0

Wrap your string parameters in single quotes

<button type="button" onclick="myFunction('demo', 'My First Javascript')">Click Me!</button>

answered Dec 2, 2017 at 3:21

Denno

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Comments

Enzo Lizama · Accepted Answer · 2017-12-02 03:28:41Z

0

Your parameter << demo >> must be in single quotes, because in the js file the parameters take it as strings <button type="button" onclick="myFunction('demo', 'My First Javascript')">Click Me!</button>

answered Dec 2, 2017 at 3:28

Enzo Lizama

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4 Comments

doubleOrt Over a year ago

Why add the same answer as 3 people before you ?

Enzo Lizama Over a year ago

I did not read the page update that said there are 2 new answers, I was still writing ... :sweat_smile: , and yes now it's really unuseful

doubleOrt Over a year ago

@Enzo_Lizama This happened with my answer too (@Denno answered a few seconds before me), but the thing is that your answer 7 mins after the first answers, so I thought it was otherwise. Sorry.

Enzo Lizama Over a year ago

I went to bring food after reading the question and then started writing: smile:, no problem

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