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JavaScript implements iframe automatic height adjustment and cross-origin of different primary domain names, javascriptiframe

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JavaScript implements iframe automatic height adjustment and cross-origin of different primary domain names, javascriptiframe

As we all know, JavaScript has a same-origin policy, that is, different nested iframe of the primary domain name does not allow Js communication.

For example, if I have a website that is embedded with its webpage. Then I can use iframe to reference the address of a third-party website.

However, the iframe height is fixed and cannot be well integrated with a third-party website. For example, if a third-party website uses the waterfall stream plug-in and needs to scroll to load the automatically calculated height, cross-origin is the first question: the iframe primary domain name has different cross-domain methods. If an iframe reference B .com is put in website A.com B .com A, Js in B .com cannot access A.com. Javascript cross-origin must be the same origin, that is, the same primary domain name. Is that swollen?

We can introduce an iframe in B .com and call it "C". This iframe loads a webpage in A.com. In this way, a webpage in the iframe in B .com can communicate with A.com. Next, as long as B communicates with C, C communicates with A to complete B-> A communication. In this way, C is notified when B's height changes, and C notifies A to adjust the iframe height.
Communication between B and C can be achieved through the url address. B .com iframe is set to hidden. C can receive the communication when the src address is changed.

No need to talk about code.

A.com/index.html


B .com/index.html


<Html> 


C proxy File


<Script> var search = window. location. search, getSearchParam = function (search, key) {var mc = search. match (new RegExp (key + "= ([^ \ &] *)"), ret = ""; mc & mc. length & (ret = mc [0]. replace (key + "=", ""); return ret;}, // parameter h = getSearchParam (search, "h"), ifmID = getSearchParam (search, "ifmID"), cbn = getSearchParam (search, "cbn"), // width and height mh = getSearchParam (search, "mh") | h, isFunction = function (fn ) {Return !! Fn &&! Fn. nodeName & fn. constructor! = String & fn. constructor! = RegExp & fn. constructor! = Array & (/function/I ). test (fn + "") ;}; try {if (parent & parent. parent) {ifm = parent.parent.doc ument. getElementById (ifmID); ifm & mh & (ifm. height = mh); fn = parent. parent [cbn]; isFunction (fn) & fn. call (); ifm = null ;}} catch (ex) {console. log (ex) ;}</script>



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