The application of the layer and its fixed position (2)

   2, the property that changes a layer


　 The main attribute of the layer has: ID, size (wide and tall) , the position (include Z-index) , setting, visibility, spill over etc. Among them size and planar position can use a mouse to come true dilatory and simply, other property needs face plate of attribute of have the aid of to define.
 

Graph: The attribute face plate of the layer

ID: The Dreamweaver when the layer is being inserted can name his automatically ID, acquiescent format is LayerX (the extraction of X is worth those who follow a layer to insert ordinal and increase) . To be controlled better when convenient design, proposal proper motion defines this name.

Size: Can pass a mouse the reference point of direct and dilatory layer will change its size, also can input size of broad high definition on attribute face plate.

The position: Choose the control handle of the layer, press mouse Zun Jian is not unlocked, the position of layer of OK and dilatory change, at the same time the positional parameter on attribute face plate can be changed. You also can go up in attribute face plate directly input numerical value will define ever the position. So that consult,the proposal when the position of dilatory definition layer opens setting reseau fixed p osition. (View- - > Gird- - > Show Gird) if need very exact location, OK and dilatory hind numerical value is changed on attribute face plate. Additional, because Netcape has difference to the explanation of the layer, be aimed at NC to be able to choose a label to be commonly soOr. Be elected as the random in deciding these two labels when, you can discover the attribute face plate of the layer increased a few property, the sheet that has an Use among them is chosen by twist, choose Left Top, it is in NC, the LEFT of the layer and TOP photograph to father layer (page or the layer of nest) fixed position of top left corner; Choose Page X, page Y, criterion the layer is based on fixed position of page top left corner, no matter whether the layer is by nest in other layer.

Z-index: The cascade that defined a layer to go up in stereo direction is ordinal, its numeric size decided the order that enclothes each other between the element, for example A layer enclothed B layer originally, but if the Z-index of B layer is worth a change, and heavy rain the Z-index value of A layer, criterion B layer enclothes A layer.

When the layer is added in documentation, dreamweaver meets what found automatically according to the layer define Z-index value orderly early or late, if want to change their cascade order, need to revise Z-index to be worth only can. For example you need a certain forever uppermost face, the Z-index value that you can define it is very great.

Z-index value also can be negative worth. When needing to regard a webpage as setting work of a certain Flash for example, you need to define this Flash work to be setting transparent, in laying the layer that is negative worth in Z-index value next, otherwise the strat osphere that Flash work can be in a page forever.

Setting: The property with form is same, the layer also can install background picture or setting color.

Visibility (Vis) : Of layer and form the biggest different point is it has changeful visibility, the layer can be concealed and show namely, and this attribute is OK of dynamic change. What define on attribute face plate is the initiative condition of visibility only, choose HIDE criterion layer to be for example sightless.

Spill over (Overflow) : Because the size of the layer can be defined, become so how should when the content in the layer exceeds the size of the layer, do? Acquiescent state lower level can increase automatically. But some moment its whole page with add congress to cause a platoon good is out of shape, spill over the processing way that attribute defined this kind of case: Visible, conceal, scroll, automatic. Visible (Isible)---No matter how much the wide tall setting of th e layer is, among them content can be shown come, namely the layer can be maintained big.
Conceal (Hidden)---Abide by the wide tall setting of the layer, the share that exceed will show no longer.
Scroll (Scroll)- - indication scroll, no matter whether content exceeds the size setting of the layer.
Automatic (Auto)---Identify content automatically to whether be exceeded, decide to whether show scroll next