There is one scenario where it fails, actually I shall not say it fails rather it is not meant for such scenario. The scenario is when we set maxlength to 20 as shown below
And in code behind if we set text property of textbox programmatically as shown below
In this case the resulting screen would be
This means, in this case it does not restrict maximum number of characters to 20, the reason is, if you see the source of the page (the rendered HTML)
Here the MaxLength property of asp.net control gets converted to maxlength property of HTML and this is meant for client validation and not for server validation. And we are trying to set the value at the server side, which leads to a wrong validation.Here one has to be aware of this while using MaxLength property.
Another interesting fact about the MaxLength property is, it does not work when you set TextMode="MultiLine"
Say for example we have scenario as shown below
Now if you see source of this page it will be as show below
As we know when we set TextMode="MultiLine", it gets rendered as textarea and surprisingly there is no equivalent attribute/property available for textaera for MaxLengthSo in case of TextMode="MultiLine" or when we use HTML textarea we do not have any property which will restrict maxlength. In this case we can write our own javascript function which will check the length on every key press in the textarea. There are many sample available on internet for this.
Few of them are at
http://www.dynamicdrive.com/dynamicindex16/limitinput.htm
http://www.quirksmode.org/dom/maxlength.html
Hope this information helps you.
In case if you find any information here is wrong please feel free to write to me Bharat.Mane@gmail.com
Thank You
Bharat Mane
3 comments:
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