mirror of
https://github.com/urbit/shrub.git
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31 lines
739 B
JavaScript
31 lines
739 B
JavaScript
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urb.waspElem = function(ele){
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url = ele.src || ele.href
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if(!url || (new URL(url)).host != document.location.host)
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return;
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urb.waspUrl(url)
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}
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urb.waspUrl = function(url){
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var xhr = new XMLHttpRequest()
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xhr.open("HEAD", url)
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xhr.send()
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xhr.onload = urb.waspLoadedXHR
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}
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urb.waspLoadedXHR = function(){urb.wasp(urb.getXHRWasp(this))}
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urb.getXHRWasp = function(xhr){
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var dep = xhr.getResponseHeader("etag")
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if(dep) return JSON.parse(dep.substr(2))
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}
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urb.datadeps = {}
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urb.waspData = function(dep){
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urb.datadeps[dep] = true
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urb.wasp(dep)
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}
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urb.ondataupdate = urb.onupdate // overridable
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var _onupdate = urb.onupdate
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urb.onupdate = function(dep){
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if(urb.datadeps[dep]) urb.ondataupdate(dep)
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else _onupdate(dep)
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}
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