I am dealing with several field names that follow the pattern: 'Field1_ro', 'Field2_ro', 'Field3_ro'...
Is there a more efficient way for me to make all fields containing 'ro' read-only without having to manually set each one like in the code snippet below?
document.getElementById('Field1_ro').readOnly = true;
document.getElementById('Field2_ro').readOnly = true;
document.getElementById('Field3_ro').readOnly = true;
If you want to make elements read-only based on the id attribute ending with a certain value, you can use the attribute-ends-with selector like this: [id$=_ro]. Simply use querySelectorAll and loop through the results:
document.querySelectorAll("[id$=_ro]").forEach(function(element) {
element.readOnly = true;
});
In general, it's more common to assign a common class to these elements and select them by their class. Alternatively, consider setting the readonly attribute when defining the elements initially rather than afterward. :-)
Please note that the NodeList returned by querySelectorAll only recently gained support for forEach. If you need to support older browsers, you can polyfill this feature easily. Check out this example for a guide on how to do so.
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