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fix(icon): prevent ssr rendering

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This commit is contained in:
Adam Bradley
2017-08-11 00:31:59 -05:00
parent 1c779aa501
commit b3ea4ecc75
1 changed files with 79 additions and 83 deletions
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164
packages/core/src/components/icon/icon.tsx
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@ -19,7 +19,7 @@ export class Icon {
/**
* @input {string} Specifies the label to use for accessibility. Defaults to the icon name.
*/
@State() ariaLabel: string = '';
@Prop() ariaLabel: string = '';
/**
* @input {string} Specifies which icon to use. The appropriate icon will be used based on the mode.
@ -38,20 +38,13 @@ export class Icon {
@Prop() md: string = '';
@State() svgContent: string = null;
@Prop({ context: 'isServer'}) private isServer: boolean;
getSvgUrl() {
const iconName = this.iconName;
if (iconName !== null) {
return `${publicPath}svg/${iconName}.svg`;
}
return null;
}
@State() private svgContent: string = null;
get iconName() {
private get iconName() {
// if no name was passed set iconName to null
if (!this.name) {
return null;
@ -117,73 +110,18 @@ export class Icon {
}
static loadSvgContent(svgUrl: string, callback: {(loadedSvgContent: string): void}) {
// static since all IonIcons use this same function and pointing at global/shared data
// passed in callback will have instance info
// add to the list of callbacks to fiure when this url is finished loading
IonIcon.loadCallbacks[svgUrl] = IonIcon.loadCallbacks[svgUrl] || [];
IonIcon.loadCallbacks[svgUrl].push(callback);
if (IonIcon.activeRequests[svgUrl]) {
// already requesting this url, don't bother again kicking off another
return;
}
// add this url to our list of active requests
IonIcon.activeRequests[svgUrl] = true;
// kick off the request for the external svg file
const xhr = new XMLHttpRequest();
xhr.addEventListener('load', function() {
// awesome, we've finished loading the svg file
// remove this url from the active requests
delete IonIcon.activeRequests[svgUrl];
// this response is the content of the svg file we're looking for
let svgContent = this.responseText;
if (this.status >= 400) {
// umm, not awesome, something is up
console.error('Icon could not be loaded:', svgUrl);
svgContent = `<!--error loading svg-->`;
}
// cache the svg content in the global IonIcon constant
IonIcon.svgContents[svgUrl] = svgContent;
// find any callbacks waiting on this url
const svgLoadCallbacks = IonIcon.loadCallbacks[svgUrl];
if (svgLoadCallbacks) {
// loop through all the callbacks that are waiting on the svg content
for (var i = 0; i < svgLoadCallbacks.length; i++) {
// fire off this callback which was provided by an instance
svgLoadCallbacks[i](svgContent);
}
delete IonIcon.loadCallbacks[svgUrl];
}
});
xhr.addEventListener('error', () => {
// umm, idk
console.error('Icon could not be loaded:', svgUrl);
});
// let's do this!
xhr.open('GET', svgUrl, true);
xhr.send();
}
render() {
const svgUrl = this.getSvgUrl();
if (this.isServer) {
return <div class="icon-inner">{/* ssr */}</div>;
}
const svgUrl = getSvgUrl(this.iconName);
if (!svgUrl) {
// we don't have good data
return <div class="icon-inner">{/* invalid svg */}</div>;
}
const svgContent = IonIcon.svgContents[svgUrl];
const svgContent = svgContents[svgUrl];
if (svgContent === this.svgContent) {
// we've already loaded up this svg at one point
// and the svg content we've loaded and assigned checks out
@ -193,7 +131,7 @@ export class Icon {
// haven't loaded this svg yet
// start the request
Icon.loadSvgContent(svgUrl, loadedSvgContent => {
loadSvgContent(svgUrl, loadedSvgContent => {
// we're finished loading the svg content!
// set to this.svgContent so we do another render
this.svgContent = loadedSvgContent;
@ -206,15 +144,73 @@ export class Icon {
}
const IonIcon: GlobalIonIcon = {
activeRequests: {},
loadCallbacks: [] as any,
svgContents: {}
};
interface GlobalIonIcon {
activeRequests: {[url: string]: boolean};
loadCallbacks: {[url: string]: {(loadedSvgContent: string): void}[]};
svgContents: {[url: string]: string};
function getSvgUrl(iconName: string) {
if (iconName !== null) {
return `${publicPath}svg/${iconName}.svg`;
}
return null;
}
function loadSvgContent(svgUrl: string, callback: {(loadedSvgContent: string): void}) {
// static since all IonIcons use this same function and pointing at global/shared data
// passed in callback will have instance info
// add to the list of callbacks to fiure when this url is finished loading
loadCallbacks[svgUrl] = loadCallbacks[svgUrl] || [];
loadCallbacks[svgUrl].push(callback);
if (activeRequests[svgUrl]) {
// already requesting this url, don't bother again kicking off another
return;
}
// add this url to our list of active requests
activeRequests[svgUrl] = true;
// kick off the request for the external svg file
const xhr = new XMLHttpRequest();
xhr.addEventListener('load', function() {
// awesome, we've finished loading the svg file
// remove this url from the active requests
delete activeRequests[svgUrl];
// this response is the content of the svg file we're looking for
let svgContent = this.responseText;
if (this.status >= 400) {
// umm, not awesome, something is up
console.error('Icon could not be loaded:', svgUrl);
svgContent = `<!--error loading svg-->`;
}
// cache the svg content in the global IonIcon constant
svgContents[svgUrl] = svgContent;
// find any callbacks waiting on this url
const svgLoadCallbacks = loadCallbacks[svgUrl];
if (svgLoadCallbacks) {
// loop through all the callbacks that are waiting on the svg content
svgLoadCallbacks.forEach(cb => {
// fire off this callback which was provided by an instance
cb(svgContent);
});
delete loadCallbacks[svgUrl];
}
});
xhr.addEventListener('error', () => {
// umm, idk
console.error('Icon could not be loaded:', svgUrl);
});
// let's do this!
xhr.open('GET', svgUrl, true);
xhr.send();
}
const activeRequests: {[url: string]: boolean} = {};
const loadCallbacks: {[url: string]: {(loadedSvgContent: string): void}[]} = [] as any;
const svgContents: {[url: string]: string} = {};