5cf73e76fe
git-svn-id: http://svn.openlayers.org/trunk/openlayers@12116 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
225 lines
8.0 KiB
JavaScript
225 lines
8.0 KiB
JavaScript
/* Copyright (c) 2006-2011 by OpenLayers Contributors (see authors.txt for
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* full list of contributors). Published under the Clear BSD license.
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* See http://svn.openlayers.org/trunk/openlayers/license.txt for the
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* full text of the license. */
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/**
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* @requires OpenLayers/Tile/Image.js
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*/
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/**
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* Constant: OpenLayers.Tile.Image.IFrame
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* Mixin for tiles that use form-encoded POST requests to get images from
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* remote services. Images will be loaded using HTTP-POST into an IFrame.
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*
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* This mixin will be applied to <OpenLayers.Tile.Image> instances
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* configured with <OpenLayers.Tile.Image.allowPost> or
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* <OpenLayers.Tile.Image.enforcePost> set to true.
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*
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* Inherits from:
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* - <OpenLayers.Tile.Image>
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*/
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OpenLayers.Tile.Image.IFrame = {
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/**
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* Property: useIFrame
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* {Boolean} true if we are currently using an IFrame to render POST
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* responses, false if we are using an img element to render GET responses.
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*/
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useIFrame: null,
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/**
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* Method: clear
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* Removes the iframe from DOM (avoids back-button problems).
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*/
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clear: function() {
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if (this.useIFrame) {
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if (this.imgDiv) {
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var iFrame = this.imgDiv.firstChild;
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OpenLayers.Event.stopObservingElement(iFrame);
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this.imgDiv.removeChild(iFrame);
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delete iFrame;
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}
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} else {
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OpenLayers.Tile.Image.prototype.clear.apply(this, arguments);
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}
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},
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/**
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* Method: renderTile
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*/
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renderTile: function() {
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if (OpenLayers.Tile.Image.prototype.renderTile.apply(this, arguments) &&
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this.useIFrame) {
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// create a html form and add it temporary to the layer div
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var form = this.createRequestForm();
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this.imgDiv.appendChild(form);
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// submit the form (means fetching the image)
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form.submit();
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this.imgDiv.removeChild(form);
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delete form;
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}
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return true;
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},
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/**
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* Method: initImgDiv
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* Creates the imgDiv property on the tile.
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*/
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initImgDiv: function() {
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this.useIFrame = this.maxGetUrlLength !== null && !this.layer.async &&
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this.url.length > this.maxGetUrlLength;
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if (this.imgDiv != null) {
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var nodeName = this.imgDiv.nodeName.toLowerCase();
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if ((this.useIFrame && nodeName == "img") ||
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(!this.useIFrame && nodeName == "div")) {
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// switch between get and post
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this.removeImgDiv();
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this.imgDiv = null;
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}
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}
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if (this.useIFrame) {
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if (this.imgDiv == null) {
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var eventPane = document.createElement("div");
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if(OpenLayers.BROWSER_NAME == "msie") {
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// IE cannot handle events on elements without backgroundcolor.
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// So we use this little hack to make elements transparent
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eventPane.style.backgroundColor = '#FFFFFF';
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eventPane.style.filter = 'chroma(color=#FFFFFF)';
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}
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OpenLayers.Util.modifyDOMElement(eventPane, null,
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new OpenLayers.Pixel(0,0), this.layer.getImageSize(), "absolute");
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this.imgDiv = document.createElement("div");
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this.imgDiv.appendChild(eventPane);
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OpenLayers.Util.modifyDOMElement(this.imgDiv, this.id, null,
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this.layer.getImageSize(), "relative");
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this.imgDiv.className = 'olTileImage';
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this.frame.appendChild(this.imgDiv);
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this.layer.div.appendChild(this.frame);
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if(this.layer.opacity != null) {
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OpenLayers.Util.modifyDOMElement(this.imgDiv, null, null,
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null, null, null, null,
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this.layer.opacity);
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}
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// we need this reference to check back the viewRequestID
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this.imgDiv.map = this.layer.map;
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}
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this.imgDiv.viewRequestID = this.layer.map.viewRequestID;
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} else {
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OpenLayers.Tile.Image.prototype.initImgDiv.apply(this, arguments);
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}
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},
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/**
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* Method: createIFrame
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* Create the IFrame which shows the image.
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*
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* Returns:
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* {DOMElement} Iframe
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*/
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createIFrame: function() {
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var id = this.id+'_iFrame';
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var iframe;
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if(OpenLayers.BROWSER_NAME == "msie") {
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// InternetExplorer does not set the name attribute of an iFrame
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// properly via DOM manipulation, so we need to do it on our own with
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// this hack.
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iframe = document.createElement('<iframe name="'+id+'">');
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// IFrames in InternetExplorer are not transparent, if you set the
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// backgroundColor transparent. This is a workarround to get
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// transparent iframes.
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iframe.style.backgroundColor = '#FFFFFF';
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iframe.style.filter = 'chroma(color=#FFFFFF)';
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}
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else {
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iframe = document.createElement('iframe');
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iframe.style.backgroundColor = 'transparent';
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// iframe.name needs to be an unique id, otherwise it
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// could happen that other iframes are overwritten.
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iframe.name = id;
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}
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iframe.id = id;
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// some special properties to avoid scaling the images and scrollbars
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// in the iframe
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iframe.scrolling = 'no';
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iframe.marginWidth = '0px';
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iframe.marginHeight = '0px';
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iframe.frameBorder = '0';
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OpenLayers.Util.modifyDOMElement(iframe, id,
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new OpenLayers.Pixel(0,0), this.layer.getImageSize(), "absolute");
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//bind a listener to the onload of the iframe so that we
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// can register when a tile has finished loading.
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var onload = function() {
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//normally isLoading should always be true here but there are some
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// right funky conditions where loading and then reloading a tile
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// with the same url *really*fast*. this check prevents sending
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// a 'loadend' if the msg has already been sent
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//
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if (this.isLoading) {
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this.isLoading = false;
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this.events.triggerEvent("loadend");
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}
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};
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OpenLayers.Event.observe(iframe, 'load',
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OpenLayers.Function.bind(onload, this));
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return iframe;
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},
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/**
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* Method: createRequestForm
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* Create the html <form> element with width, height, bbox and all
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* parameters specified in the layer params.
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*
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* Returns:
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* {DOMElement} The form element which sends the HTTP-POST request to the
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* WMS.
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*/
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createRequestForm: function() {
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// creation of the form element
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var form = document.createElement('form');
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form.method = 'POST';
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var cacheId = this.layer.params["_OLSALT"];
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cacheId = (cacheId ? cacheId + "_" : "") + this.bounds.toBBOX();
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form.action = OpenLayers.Util.urlAppend(this.layer.url, cacheId);
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// insert the iframe, which has been removed to avoid back-button
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// problems
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this.imgDiv.insertBefore(this.createIFrame(), this.imgDiv.firstChild);
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form.target = this.id+'_iFrame';
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// adding all parameters in layer params as hidden fields to the html
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// form element
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var imageSize = this.layer.getImageSize();
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var params = OpenLayers.Util.getParameters(this.url);
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for(var par in params) {
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var field = document.createElement('input');
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field.type = 'hidden';
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field.name = par;
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field.value = params[par];
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form.appendChild(field);
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}
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return form;
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}
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};
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