<%var limit = 8;var start = 1;var end = numPages;if (numPages > limit) {var startOffset = Math.floor(limit/2) + limit%2 - 1;var endOffset = limit - startOffset - 1;start = pageNum - startOffset;end = pageNum + endOffset;if (end > numPages) {start = start - (end - numPages);end = numPages;}if (start < 1) {end = end + (1 - start);start = 1;}}for (var i=start; i <= end; i++) {if (pageNum == i) { %><% } else { %><% }}%>
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Now, let's dissect the concepts embedded in the provided code snippet, shedding light on each element to facilitate a comprehensive understanding:
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Variable Declaration:
<%var limit = 8;declares a variable named "limit" and initializes it with the value 8.
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Conditional Statements:
- The code employs conditional statements, specifically an if-statement:
if (numPages > limit) { ... }. This checks whether the number of pages, represented by the variable "numPages," exceeds the defined limit. If true, additional calculations and adjustments are made.
- The code employs conditional statements, specifically an if-statement:
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Mathematical Operations:
- The code involves various mathematical operations, such as addition (
+), subtraction (-), multiplication (*), and division (/). For example,Math.floor(limit/2)calculates the floor division of the limit by 2.
- The code involves various mathematical operations, such as addition (
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Iteration (For Loop):
- The primary loop in the code is a
forloop:for (var i=start; i <= end; i++) { ... }. This loop iterates over a range of values, with "i" starting from "start" and continuing until it reaches or exceeds "end."
- The primary loop in the code is a
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Page Number Comparison:
- Within the loop, there's a conditional check:
if (pageNum == i) { ... } else { ... }. This compares the current iteration value "i" with the variable "pageNum," allowing for special handling when these values are equal.
- Within the loop, there's a conditional check:
By combining these elements, the code appears to be a dynamic paginator or page navigation system. It calculates the start and end points for a loop based on the current page number, ensuring that a specific range of pages is displayed and providing a mechanism for highlighting the current page.
If you have any specific questions or need further clarification on any aspect, feel free to inquire.
