如何更改javascript for循环条件？ 新手问题

Question

Javascript newbie here, just trying to tweak this bit of code. It checks for all HTML elements with a title attribute and adds the class 'tooltipParent'.

I'd like it to only add the class to elements with a title attribute AND the class 'tooltip'. I think I need to add something to the for loop to check for this extra class?

// loop through all objects with a title attribute
var titles=$('[title]');

// use an efficient for loop as there may be a lot to cycle through
for(var i=titles.length-1;i>-1;i--){

   // titled object must be position:relative
   $(titles[i]).addClass('tooltipParent');

}

Thanks!

Answer 1

You can put the class requirement into your original selector:

$('*.tooltip[title]').addClass('tooltipParent');

---

This means

• select all elements ( * )
• with the class "tooltip" ( .tooltip )
• and a title attribute set ( [title] )
• and add the class tooltipParent

Answer 2

You can extend your jQuery selector on the first line to select the proper elements. Look at the jQuery documentation for help. It's probably something like var titles = $('.tooltip[title]') .