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/* Copyright (c) 2006-2013 by OpenLayers Contributors (see authors.txt for
* full list of contributors). Published under the 2-clause BSD license.
* See license.txt in the OpenLayers distribution or repository for the
* full text of the license. */
/**
* @requires OpenLayers/Tile/Image.js
*/
/**
* Constant: OpenLayers.Tile.Image.IFrame
* Mixin for tiles that use form-encoded POST requests to get images from
* remote services. Images will be loaded using HTTP-POST into an IFrame.
*
* This mixin will be applied to <OpenLayers.Tile.Image> instances
* configured with <OpenLayers.Tile.Image.maxGetUrlLength> set.
*/
OpenLayers.Tile.Image.IFrame = {
/**
* Property: useIFrame
* {Boolean} true if we are currently using an IFrame to render POST
* responses, false if we are using an img element to render GET responses.
*/
useIFrame: null,
/**
* Property: blankImageUrl
* {String} Using a data scheme url is not supported by all browsers, but
* we don't care because we either set it as css backgroundImage, or the
* image's display style is set to "none" when we use it.
*/
blankImageUrl: "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAQAIBRAA7",
/**
* Method: draw
* Set useIFrame in the instance, and operate the image/iframe switch.
* Then call Tile.Image.draw.
*
* Returns:
* {Boolean}
*/
draw: function() {
var draw = OpenLayers.Tile.Image.prototype.shouldDraw.call(this);
if(draw) {
// this.url isn't set to the currect value yet, so we call getURL
// on the layer and store the result in a local variable
var url = this.layer.getURL(this.bounds);
var usedIFrame = this.useIFrame;
this.useIFrame = this.maxGetUrlLength !== null &&
!this.layer.async &&
url.length > this.maxGetUrlLength;
var fromIFrame = usedIFrame && !this.useIFrame;
var toIFrame = !usedIFrame && this.useIFrame;
if(fromIFrame || toIFrame) {
// Switching between GET (image) and POST (iframe).
// We remove the imgDiv (really either an image or an iframe)
// from the frame and set it to null to make sure initImage
// will call getImage.
if(this.imgDiv && this.imgDiv.parentNode === this.frame) {
this.frame.removeChild(this.imgDiv);
}
this.imgDiv = null;
// And if we had an iframe we also remove the event pane.
if(fromIFrame) {
this.frame.removeChild(this.frame.firstChild);
}
}
}
return OpenLayers.Tile.Image.prototype.draw.apply(this, arguments);
},
/**
* Method: getImage
* Creates the content for the frame on the tile.
*/
getImage: function() {
if (this.useIFrame === true) {
if (!this.frame.childNodes.length) {
var eventPane = document.createElement("div"),
style = eventPane.style;
style.position = "absolute";
style.width = "100%";
style.height = "100%";
style.zIndex = 1;
style.backgroundImage = "url(" + this.blankImageUrl + ")";
this.frame.appendChild(eventPane);
}
var id = this.id + '_iFrame', iframe;
if (parseFloat(navigator.appVersion.split("MSIE")[1]) < 9) {
// Older IE versions do not set the name attribute of an iFrame
// properly via DOM manipulation, so we need to do it on our own with
// this hack.
iframe = document.createElement('<iframe name="'+id+'">');
// IFrames in older IE versions are not transparent, if you set
// the backgroundColor transparent. This is a workaround to get
// transparent iframes.
iframe.style.backgroundColor = '#FFFFFF';
iframe.style.filter = 'chroma(color=#FFFFFF)';
}
else {
iframe = document.createElement('iframe');
iframe.style.backgroundColor = 'transparent';
// iframe.name needs to be an unique id, otherwise it
// could happen that other iframes are overwritten.
iframe.name = id;
}
// some special properties to avoid scaling the images and scrollbars
// in the iframe
iframe.scrolling = 'no';
iframe.marginWidth = '0px';
iframe.marginHeight = '0px';
iframe.frameBorder = '0';
iframe.style.position = "absolute";
iframe.style.width = "100%";
iframe.style.height = "100%";
if (this.layer.opacity < 1) {
OpenLayers.Util.modifyDOMElement(iframe, null, null, null,
null, null, null, this.layer.opacity);
}
this.frame.appendChild(iframe);
this.imgDiv = iframe;
return iframe;
} else {
return OpenLayers.Tile.Image.prototype.getImage.apply(this, arguments);
}
},
/**
* Method: createRequestForm
* Create the html <form> element with width, height, bbox and all
* parameters specified in the layer params.
*
* Returns:
* {DOMElement} The form element which sends the HTTP-POST request to the
* WMS.
*/
createRequestForm: function() {
// creation of the form element
var form = document.createElement('form');
form.method = 'POST';
var cacheId = this.layer.params["_OLSALT"];
cacheId = (cacheId ? cacheId + "_" : "") + this.bounds.toBBOX();
form.action = OpenLayers.Util.urlAppend(this.layer.url, cacheId);
form.target = this.id + '_iFrame';
// adding all parameters in layer params as hidden fields to the html
// form element
var imageSize = this.layer.getImageSize(),
params = OpenLayers.Util.getParameters(this.url),
field;
for(var par in params) {
field = document.createElement('input');
field.type = 'hidden';
field.name = par;
field.value = params[par];
form.appendChild(field);
}
return form;
},
/**
* Method: setImgSrc
* Sets the source for the tile image
*
* Parameters:
* url - {String}
*/
setImgSrc: function(url) {
if (this.useIFrame === true) {
if (url) {
var form = this.createRequestForm();
this.frame.appendChild(form);
form.submit();
this.frame.removeChild(form);
} else if (this.imgDiv.parentNode === this.frame) {
// we don't reuse iframes to avoid caching issues
this.frame.removeChild(this.imgDiv);
this.imgDiv = null;
}
} else {
OpenLayers.Tile.Image.prototype.setImgSrc.apply(this, arguments);
}
},
/**
* Method: onImageLoad
* Handler for the image onload event
*/
onImageLoad: function() {
//TODO de-uglify opacity handling
OpenLayers.Tile.Image.prototype.onImageLoad.apply(this, arguments);
if (this.useIFrame === true) {
this.imgDiv.style.opacity = 1;
this.frame.style.opacity = this.layer.opacity;
}
},
/**
* Method: createBackBuffer
* Override createBackBuffer to do nothing when we use an iframe. Moving an
* iframe from one element to another makes it necessary to reload the iframe
* because its content is lost. So we just give up.
*
* Returns:
* {DOMElement}
*/
createBackBuffer: function() {
var backBuffer;
if(this.useIFrame === false) {
backBuffer = OpenLayers.Tile.Image.prototype.createBackBuffer.call(this);
}
return backBuffer;
}
};