Programmatically construct a condition for use in an if() statement

Question

Let's assume for a moment that I have something like this:

if (document.getElementById('div1').innerHTML &&     document.getElementById('div2').innerHTML &&     document.getElementById('div3').innerHTML &&     document.getElementById('div4').innerHTML &&     document.getElementById('div5').innerHTML &&     ...     document.getElementById('div100').innerHTML) 

Obviously typing out and maintaining a big conditional statement like this is problematic.

I would like some solution like:

var conditional = ""; for(var i = 1; i <= 100; i++){   conditional += "document.getElementById('div" + i +"').innerHTML";   if(i < 100) {     conditional += " && ";   } } if(interpretStringAsJSExpression(conditional)){     console.log("all my divs have content"); } 

Is something like this possible in JavaScript?

Great answers have been submitted, and I am sure that I and others will benefit from them. However, purely from a place of curiosity, is it possible to store and run JavaScript expressions or commands in strings?

Like I have proposed in my example: interpretStringAsJSExpression(conditional)

Answer 1

You can do the tests in a loop.

var allOK = true; for (var i = 1; i <= 100; i++) {     if (!document.getElementById("div"+i).innerHTML) {         allOK = false;         break;     } } if (allOK) {     console.log("all my divs have content"); } 

You could also give all your DIVs a common class, then use a built-in iterator.

var allDivs = document.getElementsByClassName("divClass"); if (Array.from(allDivs).every(div => div.innerHTML)) {     console.log("all my divs have content"); } 

Answer 2

As the other answers said, you can solve your conditions problem more easily.

But, to answer your new question

purely from a place of curiosity, is it possible to store and run JavaScript expressions or commands in strings?

Yes, you can write JavaScript code to a string and execute it later with eval. Which you should not do if you are concerned with security or performance.