Disable script on condition

JavaScript
1

Good evening, could you help me, please? From this saved (static) page, page two, I’m running a script that extracts, in “Nome” field, the publisher from the bibliographic item (Feltrinelli, in the example). I would like the script to be NOT executed when on the previous page, page one, there is the expression “Editore moderno” (that is the publisher) under the heading “Persone, enti e famiglie”, that is in “fieldset.legami_tito”).

In Page one I tried to set a local variable if the expression “Editore moderno” is found:

var elencoLabel = document.querySelectorAll("span.grid-6");
    if (elencoLabel.length > 8)
    {
        localStorage.removeItem("voce");
        if (elencoLabel[8].innerText == "Editore moderno")
        {
            localStorage.setItem("voce","Editore moderno");        
        }
    }

In Page two I tried with this script (replacing the last line of the script):

 function getNome(tmp) {

    var idx = tmp.indexOf('. ((');

    if(idx > -1){
    tmp = tmp.substr(0, idx);
    }

    tmp = tmp.split('. - ');

    switch(tmp.length){
    case 3:
    tmp = tmp[1];
    break;
    case 4:
    tmp = tmp[2];
    break;
    default:
    tmp = "";
    break;
    }

    if(tmp !== ''){
        tmp = tmp.substr(tmp.indexOf(' : ') + 2);
        console.log(tmp);
        if(tmp.indexOf('.') != -1 && tmp.split('.').length == 2){
            tmp = tmp.substr(tmp.indexOf('. ') + 1, tmp.indexOf(', ') -3);
            tmp = tmp.trim();
        }
        else {
            tmp = tmp.split(",")[0];
            tmp = tmp.trim();
        }
    }
    return tmp;
}
function impostaNome(tmp) {
    Array.from(document.querySelectorAll('article section.grid_container form div.grid-row label span')).filter( e => e.innerText.trim() === 'Nome')[0].parentNode.querySelector('input').value = tmp;
}

var elencoLabel = document.querySelectorAll("span.grid-6");
if (elencoLabel.length < 8 )
{    
    var miaVoce = localStorage.getItem("voce");    
    if (miaVoce == "Editore moderno")
    {        
        impostaNome(getNome(document.querySelector('div.meta.tito div.evidence.isbd').innerText));
    }
}

But with these changes the publisher is never extracted.

2

It would be easier probably to do something like fetch page 1 from the page 2 script, and find if the words “Editore moderno” appear in the response.

3

Thanks for the answer, m_hutley, so I tried replacing the last line of the script with:

var elencoLabel = document.querySelector("span.grid-6.label");   
if (elencoLabel.textContent.trim() !== "Editore moderno") {
   impostaNome(getNome(document.querySelector('div.meta.tito div.evidence.isbd').innerText));
}

but didn’t solve.

4

Well document.querySelector can only find elements on the CURRENT page. It cant query something on a different page.

I dont know what the relationship between the two pages is in the actual deployment, so i’m speculating with your example only at this point.

fetch("page_one.html")
.then((response) => response.text())
.then((text) => {
   if (!text.includes("Editore moderno"))  { 
     impostaNome(getNome(document.querySelector('div.meta.tito div.evidence.isbd').innerText));
   }
});
5

Thanks, m_hutley, unfortunally page_one.html is a saved page, all pages in the original site (password protected) have the same URL.

6

Right… and this is where “There should be an API for this” comes into play. If the whole thing’s a dynamic load-and-replace on a single URL, you’re going to have a lot of trouble trying to reference between two different loads of data.

Does the system not expose an API for accessing the data programatically?

7

I get on Page two immediatly after accessing on Page one, so I can’t access Page two without accessing Page one first.

I don’t know, how could I see?