is param implicit object bean or Map(EL)?

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posted 17 years ago

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i have a html page

Now jsp file for above html file is

now param implicit is bean so we can write
${param.name} which will display name.
Then how can we write
${param["name"]}
Because ${param["name"]} is used for Map where param is bean.

Please help
Thanks

Christophe Verré

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posted 17 years ago

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param is a Map, not a bean.
So calling param.name will invoke get("name") on the map.
[ November 27, 2006: Message edited by: Satou kurinosuke ]

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Gowher Naik

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posted 17 years ago

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Thanks Satou for reply
it means both param.name or param["name"] will invoke get("name").
is it so?

Ashwini Hegde

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posted 17 years ago

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The dot(.) opearator can be used with maps and beans. When used with a map, the name to the right of the operator is the key in the map, whereas when used with a bean, the value to the right is the name of the property in the bean we are trying to access.

The [] operator can be used in all cases where the (.) operator is used. In addition, it can also be used in cases where the left had side of the [] operator is an arrya or a list.

And yes, as already stated, param is a map not a bean. The only implicit object in EL implicit objects list that is a bean is the pageContext. All the others are map objects.

so, param["name"] and param.name will return the same result.
[ November 27, 2006: Message edited by: Ashwini Hegde ]

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