REW Steven's Blog: PHP Programing

A very important concept in programing a system that will be used by people is Input Validation. When programmers miss this it can make life difficult for others trying to deal with the data.

As I deal with IDX Data I come across this a lot. I recently had a feed with 32 different spellings of a city name. Many of them were just typos like a semicolon (;) instead of an l ( the keys are next to each other on most keyboards ). Other cases were misspellings or variations of a name. An example would be "Saint James", "St. James", and "St James" ( without a period after St ).

If the MLS Board had Input Validation then users of the system would select the city from a list. This would fix more than just they typos and variations on the same name, it would…

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When using javascript in IE 7, you don't need to use getElementById

Thus in IE 6 you would do:

Code: <script>
var city = document.getElementById('city');
alert(city.innerHTML);
</script>

And in IE 7 you can do

Code: <script>
alert(city.innerHTML);
</script>

city is automatically an object pointing to the HTML tag with the id of that name.

This also means that if you accidentally use a variable with the same name as an id of an element, you will get errors.

I'm sure this gives rise to some kind of security flaw.

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