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compose: Extract `render_and_show_preview` function. 

This adds a function that controls the whole process of applying
markdown and displaying the markdown rendering preview on request;
This is required to avoid code duplication when adding preview feature
to message-edit UI.
This commit is contained in:
Vaibhav 2019-02-05 19:51:30 +05:30 committed by Tim Abbott
parent 5e4bd9f57d
commit 24445309e2
1 changed files with 63 additions and 57 deletions
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120
static/js/compose.js
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@ -693,6 +693,68 @@ function insert_video_call_url(url, target_textarea) {
compose_ui.insert_syntax_and_focus(video_call_link_text, target_textarea);
}
exports.render_and_show_preview = function (preview_spinner, preview_content_box, content) {
function show_preview(rendered_content, raw_content) {
// content is passed to check for status messages ("/me ...")
// and will be undefined in case of errors
var rendered_preview_html;
if (raw_content !== undefined &&
markdown.is_status_message(raw_content, rendered_content)) {
// Handle previews of /me messages
rendered_preview_html = "<p><strong>" + page_params.full_name + "</strong>" + rendered_content.slice("<p>/me".length);
} else {
rendered_preview_html = rendered_content;
}
preview_content_box.html(rendered_preview_html);
if (page_params.emojiset === "text") {
preview_content_box.find(".emoji").replaceWith(function () {
var text = $(this).attr("title");
return ":" + text + ":";
});
}
}
if (content.length === 0) {
show_preview(i18n.t("Nothing to preview"));
} else {
if (markdown.contains_backend_only_syntax(content)) {
var spinner = preview_spinner.expectOne();
loading.make_indicator(spinner);
} else {
// For messages that don't appear to contain
// bugdown-specific syntax not present in our
// marked.js frontend processor, we render using the
// frontend markdown processor message (but still
// render server-side to ensure the preview is
// accurate; if the `markdown.contains_backend_only_syntax` logic is
// incorrect wrong, users will see a brief flicker).
var message_obj = {
raw_content: content,
};
markdown.apply_markdown(message_obj);
}
channel.post({
url: '/json/messages/render',
idempotent: true,
data: {content: content},
success: function (response_data) {
if (markdown.contains_backend_only_syntax(content)) {
loading.destroy_indicator(preview_spinner);
}
show_preview(response_data.rendered, content);
},
error: function () {
if (markdown.contains_backend_only_syntax(content)) {
loading.destroy_indicator(preview_spinner);
}
show_preview(i18n.t("Failed to generate preview"));
},
});
}
};
exports.initialize = function () {
$('#stream_message_recipient_stream,#stream_message_recipient_topic,#private_message_recipient').on('keyup', update_fade);
$('#stream_message_recipient_stream,#stream_message_recipient_topic,#private_message_recipient').on('change', update_fade);
@ -913,26 +975,6 @@ exports.initialize = function () {
$("#compose #file_input").trigger("click");
});
// content is passed to check for status messages ("/me ...")
// and will be undefined in case of errors
function show_preview(rendered_content, content) {
var rendered_preview_html;
if (content !== undefined && markdown.is_status_message(content, rendered_content)) {
// Handle previews of /me messages
rendered_preview_html = "<p><strong>" + page_params.full_name + "</strong>" + rendered_content.slice("<p>/me".length);
} else {
rendered_preview_html = rendered_content;
}
$("#preview_content").html(rendered_preview_html);
if (page_params.emojiset === "text") {
$("#preview_content").find(".emoji").replaceWith(function () {
var text = $(this).attr("title");
return ":" + text + ":";
});
}
}
$('body').on('click', '.video_link', function (e) {
e.preventDefault();
@ -976,43 +1018,7 @@ exports.initialize = function () {
$("#undo_markdown_preview").show();
$("#preview_message_area").show();
if (content.length === 0) {
show_preview(i18n.t("Nothing to preview"));
} else {
if (markdown.contains_backend_only_syntax(content)) {
var spinner = $("#markdown_preview_spinner").expectOne();
loading.make_indicator(spinner);
} else {
// For messages that don't appear to contain
// bugdown-specific syntax not present in our
// marked.js frontend processor, we render using the
// frontend markdown processor message (but still
// render server-side to ensure the preview is
// accurate; if the `markdown.contains_backend_only_syntax` logic is
// incorrect wrong, users will see a brief flicker).
var message_obj = {
raw_content: content,
};
markdown.apply_markdown(message_obj);
}
channel.post({
url: '/json/messages/render',
idempotent: true,
data: {content: content},
success: function (response_data) {
if (markdown.contains_backend_only_syntax(content)) {
loading.destroy_indicator($("#markdown_preview_spinner"));
}
show_preview(response_data.rendered, content);
},
error: function () {
if (markdown.contains_backend_only_syntax(content)) {
loading.destroy_indicator($("#markdown_preview_spinner"));
}
show_preview(i18n.t("Failed to generate preview"));
},
});
}
exports.render_and_show_preview($("#markdown_preview_spinner"), $("#preview_content"), content);
});
$("#compose").on("click", "#undo_markdown_preview", function (e) {